Why 3.0 sucks?

Praufet · 06-01-2003, 10:18 PM

I have seen many people on here say the that the 3.o is an under powered gas guzzler, and seeing as I drive on, I'd have to agree. Has any figured out why it sucks though? I know we have some very smart people on this board who could probably figure out something like this. What did the change in the 3.4 to make it better?

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distortedman · 06-01-2003, 10:40 PM

the 3.4L 5vz engine has a double overhead cam
the gas milage is 19/23 with a 5speed...I suppose that
by 95 when it came out the fuel injection design
was much better that it was in 88 when the 3.0 3vz
came out, which by the way is a single overhead cam.
3vz is rated something like 14/18 mpg.
Also because the 5vz is DOHC it has 24 valves
Im not sure but I assume that the 3vz SOHC has
12 valves.

Ive had my 94 4runner for about 4 days, and though I knew what I was getting into with the 3vz Im thinking my aunts 4.0 inline 6 cherokee is more efficient.

My old runner has a 22re, that was pretty good on gas even though it had no balls. Im not quite sure tho that the 3vz is anything spectacular compared to 22re. actually I think that the 22re was just as quick on the 0 to 60. if not faster...or am I insane?

either one tho were both slugs...

L33T35T 4Runner · 06-01-2003, 10:43 PM

i dont know what they did, but they did something wrong when designing the 3.0

i hope that engineer got fired

who wants to help with a 3.4 swap?

hell.. who wants to buy my 95 so can buy a 96?

jimrockford · 06-01-2003, 10:52 PM

The 3.0 definitely isn't a very efficient engine. My wife's Chrysler Concorde weighs 4700 pounds (about 1000 more than my 4Runner). Her 3.5 liter V6 gets 24mpg and stomps all over my 3.0.

Praufet · 06-01-2003, 11:20 PM

With the whole DOHC thing. I read on the board once that the 3.0 in the camry had dohc. Does anyone know if it'd be possible to use those heads? I tried to find information on that engine, but I could find the engine code which made it hard to find specifics about the engine, any help?

**UKMyers** · 06-02-2003, 12:18 AM

Okay so the 3.0 is a little underpowered and get's crummy gas mileage. First off spend some money on it. For you with stock un's you'd be blown away what a good tune up, intake, and exhaust will do. With the addition of my latest mods I am quite happy with my power. Granted I spent a bunch of money on it. Also before you dog her too much I have seen at least 3 trucks personally with that engine with 300K plus miles on them and not ticking nor buring a drop of oil. How many domestic V-6's have you seen with that.. sure there are some but not nearly as many as the Yota's!!

EOD30 · 06-02-2003, 04:33 AM

My wifes 01 Corolla with the 4 cyl makes my 4Runner feel like a tank! That thing is quick. Its an auto too.

Bumpin' Yota · 06-02-2003, 05:11 AM

Quote:

Originally posted by UKMyers
Okay so the 3.0 is a little underpowered and get's crummy gas mileage. First off spend some money on it. For you with stock un's you'd be blown away what a good tune up, intake, and exhaust will do. With the addition of my latest mods I am quite happy with my power. Granted I spent a bunch of money on it. Also before you dog her too much I have seen at least 3 trucks personally with that engine with 300K plus miles on them and not ticking nor buring a drop of oil. How many domestic V-6's have you seen with that.. sure there are some but not nearly as many as the Yota's!!

I AGREE 100%! If you are getting bad gas milage and no power and still have everything including tires stock, something is VERY wrong. Change the fuel filter, check your O2 sensor, then do the ISR mod and air box mod, then loosen up the exhaust. With a DEAD O2 sensor and running STUPID rich, I'm still getting 17 on the highway. Prior to this I was getting 21-24 on the highway and that WAS total stock. With a new O2 sensor I shoulld be right back to the mid 20s in gas milage. Also I can accellerate uphill in O/D, well most of the hills here in FL....lol

ps - Oh yeah I'm up to 224860 miles on my 3.0L.

fsudave · 06-02-2003, 05:23 AM

I have a 94 4runner with the 3.0 engine. Yes, it get bad gas mileage (around 15 mpg) and has virtually no power, but 195,000 miles and still going strong.

fsudave · 06-02-2003, 05:30 AM

I have a 94 4runner with the 3.0 engine. Yes, it get bad gas mileage (around 15 mpg) and has virtually no power, but 195,000 miles and still going strong.

gwhayduke · 06-02-2003, 05:31 AM

I get 17-21 in city-highway. Over the past 5 years this is what I've done:

Swapped in synthetic oil for gear lube and engine oil.
Installed Bosche platinum plugs.
Tried the K&N filter but took it out because of filtration concerns.
Installed 2.25 cat-back with Magnaflow.
Installed new timing belt, idler pulleys, and waterpump.
Put about a 100,000 miles on it.

It's not a sportscar by any standards, but it does the job. What's the hurry anyway? Get it off the pavement and you'll enjoy it more.

1Runner · 06-02-2003, 08:29 AM

I agree w/ Joey. I'm not thrilled w/ my gas mileage... but I'm trying to improve it. The 4Runner IS doing better than when I bought it. I was getting 16 MPG. 2 Days ago we went visiting out of town. I averaged 18.5 MPG BEFORE adding in my 10% that my odometer is off.
Want better MPG'S?
Get manual hubs, air intake tube mod, exhaust and TUNE HER UP!! Get rid of the 200# of tools in the back and slow down a little. Next mod for me is the flex-a-lite swap.

az4x4runner · 06-02-2003, 08:29 AM

I know someone who has 202k miles on their 3.0 and it's still running great, they haven't had any problems with it either.

Oh yeah, mine with 95k miles gets around 21mpg highway.

Bumpin' Yota · 06-02-2003, 08:59 AM

Agreed 1Runner, the 3.0L in a stock 4runner should get 19-21 on the highway if the engine is in running order. (No gunning the engine and 70mph only, drop it to 65 and watch the mpg soar!)

Id bet dollars to donuts that the stock 3.0s that are getting horrible gas milage need a new O2 sensor and new fuel filter.

doink · 06-02-2003, 09:23 AM

i am getting about 13 miles per gallon on my yota..is whats the deal with that?

livelarg · 06-02-2003, 10:08 AM

I have had my 3.0 88" 4runner for about 2 months now. I was depressed by how bad my milage was when I first got it. I was getting 12-14 in the city.
two things:
First was my driving. I was trying to accelerate quickly all of the time, then trying to drive too fast. when I just relaxed a bit, I started getting about 16-17 mpg.

Second, my truck was owned for the past ten years by a middle aged woman that did not anything about cars. Needless to say, she did not always keep the car in tune, though she swears that she changed the oil religiously.
I already did the ISR mod a couple of days ago, and I am happy with that. I am ordering an Amsoil filter. And this week I am going to do a tune up with NGK V-power plugs and new wires and change the fuel filter.
In a couple of weeks, I am going to change the trans, transfer, and differentials with synthetics. Mobile 1 I think unless someone knows a better synthetic.
Hopefully this will help out some with the power and MPG. I will post the results of all of this when I am done.

BTW, I bought the truck with 226,000 miles on it, and it runns perfect, and looks great! I drove it once and decided I had to have it. I sold my 2000 Nissan Frontier crewcab to get this 4Runner. My wife thought I was crazy, but I love my new truck!

Praufet · 06-02-2003, 01:10 PM

The dohc camry engine that I have been musing about is known as the 1mzfe. It has the same 87.5mm bore that the 3vz does. Does this sound like a head swap would be possible? I know the newer 1mz's use vvt, so that would require some more work, but they even have a supercharger for the 1mz. So this may be an option for the more budget minded of us. A head swap would be a lot cheaper and easier than and engine swap. Any feedback about suggestions or concerns you guys have would be great.

edit: The 92-93 Toyota camry had the 3vzfe which is a dohc version of the 3vz-e. Sounds to me like that would work. I found a place that sells new 3vzfe heads for 475. If you guys could look around for better deals that'd be great, once I get some money I think I'm gonna head to the junk yard.

oly884 · 06-02-2003, 02:17 PM

O.K. every one knows that the 3.0 L engine isn't that great, the same with the ford 3.0L V-6's, they arn't great either. BUT why? I know it's not just the fact that it has a single over head cam. I can't really figure it out. My friend has a ranger with the 3.0 L V-6 in it and it too is gutless.

L33T35T 4Runner · 06-02-2003, 03:21 PM

my mom has a 3.0 in her 2000 sienna and its a power house, 196hp

also, the highlanders also have a 3.0 with 220hp

I'm guessing both are DOHC

rimpainter.com · 06-02-2003, 03:51 PM

Quote:

Originally posted by oly884
O.K. every one knows that the 3.0 L engine isn't that great, the same with the ford 3.0L V-6's, they arn't great either. BUT why? I know it's not just the fact that it has a single over head cam. I can't really figure it out. My friend has a ranger with the 3.0 L V-6 in it and it too is gutless.

Honda had a VTEC 3.0 V-6 in something back in the early 90's, and it wasn't gutless.

livelarg · 06-02-2003, 05:13 PM

Lets get back to the head transfer from the camary.

I have no Idea what i would take to change the SOHC to the DOHC, but It could be cool to try if they would fit on them. How would a person find out about it?

Bolverk · 06-02-2003, 08:41 PM

Dunno if it would work at all I think it would take a lot of modding the 3vz to fit the DOHC.

The timing would have to be changed to accomodate the DOHC
the VVT requires different computer, might need to change the fuel tank and pump might need to be different.

mebbe some of you might be interested in doing a project like that, but it may or may not work quite like you want. I dont know of anybody thats done such a thing...or even tried, but its pretty risky and costly....

I for one have no money for such a project, and even if I did, I would probably just prefer to go with a 5vz, which in my opinion would be an easier project especially for the money required, and so far as Ive heard it turns out pretty nice. Plus the TRD supercharger is floating around a reasonable prices, which I would definitely opt for if I had the 5vz.

IF someone decides to try making the 3vz into a Dohc ITs definitely a project you should put up here on the messageboard and tell us all how it goes.

If you got the time and money go for it.

----------------------------------------------------------------------------------
I would also like to mention that engine size doesnt mean that its weak or not. take for instance the subaru WRX. It has a 2.0 L 4 cyl boxer engine that produces 227 horsepower. or the Isuzu engine currently used in the rodeos and rodeo sports, 3.2 L v6 produces 205 HP. Its not the size, rather the design of the engine and what its been tuned for.

I personally think that the 3vz was poorly designed and that toyota should have stuck the the 22RET. I would love to find an 86-87 4runner or truck with the turbo, which produced more power than the 3vz. The 3vz has been plagued with head gasket problems. That aside the 3vz is not all that bad my 94 has 241,000 miles so far, but It has had a rebuild. As long as the head gasket doesnt blow its pretty good, and if fuel economy is a problem, just be glad you dont drive an H2.
------------------------------------------------------------------------------------

Vato Loco · 06-02-2003, 08:43 PM

Quote:

Originally posted by <96 Runner>
Honda had a VTEC 3.0 V-6 in something back in the early 90's, and it wasn't gutless.

Was it the Acura Legend or the Acura NSX?

Praufet · 06-02-2003, 09:24 PM

The 3.0 that is in new cars is the 1MZFE and it is quite the power house, it has become quite the all purpose motor being in everything from the sienna to the solora. This motor replaced the 3VZFE which is DOHC. For some odd reason they decided to put the SOHC version, the 3VZ-E, in the four runner. The 3VZ was way before VVT, and quite a lot of 1MZFE's are available with out VVT seeing as it is a fairly new technology. The swap from SOHC to DOHC should be fairly straight forward since it is pretty much the same engine. Same block different head. Shoudln't be too much hard then swapping heads on a honda. If any of you could talk to a mechanic who specializes in toyotas and find out what hard ware would be needed that'd be awesome. On first thoughts all you would need would be the heads, new head gasket, and probably some timing accesories(timing chain and such).

Oh yeah, check out my mad researchin' skillz boi!

rimpainter.com · 06-03-2003, 07:01 AM

Quote:

Originally posted by Vato Loco
Was it the Acura Legend or the Acura NSX?

NSX. But the Legend powerplant was decent too, just not VTEC powered.

06-01-2003, 10:43 PM	#3 (permalink)
L33T35T 4Runner Contributing Member Join Date: Oct 2002 Location: Fountain Valley, CA (so cali) Posts: 2,005	i dont know what they did, but they did something wrong when designing the 3.0 i hope that engineer got fired who wants to help with a 3.4 swap? hell.. who wants to buy my 95 so can buy a 96? __________________ 95 4Runner SR5 3.0l. V6 2 wheel drive baby! 31" Bridgeston Dueler A/T Revos. Downey 1.5 Coils. Doetsch MV-12 Shocks. Brembo Rotors. Performance Friction Pads. Pioneer head unit with 1 12" Pioneer woofer. XM Radio. RB Headlight Harness w/ Sylvania SilverStars New to the family: 85 4Runner 22RE, 4x4, 5 spd, SFA. 31" BFG All Terrain T/A KOs, genuine Walmart seat covers, "Dual" stereo, XM Radio, RB Headlight Harness w/ Sylvania SilverStars. Onboard air. Has been seafoamed to hell

06-01-2003, 10:52 PM	#4 (permalink)
jimrockford Contributing Member Join Date: Apr 2003 Location: Riverview, FL Posts: 542	The 3.0 definitely isn't a very efficient engine. My wife's Chrysler Concorde weighs 4700 pounds (about 1000 more than my 4Runner). Her 3.5 liter V6 gets 24mpg and stomps all over my 3.0. __________________ Kevin 2004 Infiniti G35 Coupe 1998 Toyota 4Runner Limited - Sold Deckplate Mod, Rear E-Locker, Anytime Locker Mod, Commando FM-870, 2 1/2" Lift, 285/75R16 Bridgestone Dueler Revos Kenwood XXV-01D, Sirius Sportster Replay, Memphis 16-ST500D, Rockford Fosgate 4.6x, Image Dynamics IDQ-12, CDT EF-61i

06-02-2003, 05:23 AM	#9 (permalink)
fsudave Registered User Join Date: Apr 2003 Location: Tallahassee Posts: 19	3.0 I have a 94 4runner with the 3.0 engine. Yes, it get bad gas mileage (around 15 mpg) and has virtually no power, but 195,000 miles and still going strong. __________________ fsudave 1998 4Runner V6 SR5 4WD

06-02-2003, 05:30 AM	#10 (permalink)
fsudave Registered User Join Date: Apr 2003 Location: Tallahassee Posts: 19	3.0 I have a 94 4runner with the 3.0 engine. Yes, it get bad gas mileage (around 15 mpg) and has virtually no power, but 195,000 miles and still going strong. __________________ fsudave 1998 4Runner V6 SR5 4WD

06-02-2003, 05:31 AM	#11 (permalink)
gwhayduke Contributing Member Join Date: Dec 2002 Location: El Paso, TX Posts: 1,576	I get 17-21 in city-highway. Over the past 5 years this is what I've done: Swapped in synthetic oil for gear lube and engine oil. Installed Bosche platinum plugs. Tried the K&N filter but took it out because of filtration concerns. Installed 2.25 cat-back with Magnaflow. Installed new timing belt, idler pulleys, and waterpump. Put about a 100,000 miles on it. It's not a sportscar by any standards, but it does the job. What's the hurry anyway? Get it off the pavement and you'll enjoy it more. __________________ '99 4Runner SR5 4WD, 5-SPEED. Abzug's vehicle for urban expeditions, navigating flash floods and debris flows (try 12-15 inches of rain in one week). It always gets her home. '95 4Runner LIMITED 4WD, 5-SPEED, over a quarter million on the original 3vze & headgaskets. TRD heavy duty clutch, TRD heavy duty flywheel, OME 900 springs and shocks. This old gal has gotten me out into the field, and back for 8 years, never failed to start or gotten stuck.

06-01-2003, 10:40 PM	#2 (permalink)
distortedman Registered User Join Date: Mar 2003 Posts: 7	the 3.4L 5vz engine has a double overhead cam the gas milage is 19/23 with a 5speed...I suppose that by 95 when it came out the fuel injection design was much better that it was in 88 when the 3.0 3vz came out, which by the way is a single overhead cam. 3vz is rated something like 14/18 mpg. Also because the 5vz is DOHC it has 24 valves Im not sure but I assume that the 3vz SOHC has 12 valves. Ive had my 94 4runner for about 4 days, and though I knew what I was getting into with the 3vz Im thinking my aunts 4.0 inline 6 cherokee is more efficient. My old runner has a 22re, that was pretty good on gas even though it had no balls. Im not quite sure tho that the 3vz is anything spectacular compared to 22re. actually I think that the 22re was just as quick on the 0 to 60. if not faster...or am I insane? either one tho were both slugs...

06-01-2003, 11:20 PM	#5 (permalink)
Praufet Contributing Member Join Date: May 2003 Location: Fort Worth/College Station, TX Posts: 835	With the whole DOHC thing. I read on the board once that the 3.0 in the camry had dohc. Does anyone know if it'd be possible to use those heads? I tried to find information on that engine, but I could find the engine code which made it hard to find specifics about the engine, any help?

06-02-2003, 04:33 AM	#7 (permalink)
EOD30 Registered User Join Date: Mar 2003 Location: Redstone Arsenal (Huntsville) AL Posts: 83	My wifes 01 Corolla with the 4 cyl makes my 4Runner feel like a tank! That thing is quick. Its an auto too.

06-02-2003, 08:29 AM	#12 (permalink)
1Runner Registered User Join Date: Dec 2002 Location: currently at large Posts: 902	I agree w/ Joey. I'm not thrilled w/ my gas mileage... but I'm trying to improve it. The 4Runner IS doing better than when I bought it. I was getting 16 MPG. 2 Days ago we went visiting out of town. I averaged 18.5 MPG BEFORE adding in my 10% that my odometer is off. Want better MPG'S? Get manual hubs, air intake tube mod, exhaust and TUNE HER UP!! Get rid of the 200# of tools in the back and slow down a little. Next mod for me is the flex-a-lite swap. __________________ 2002 Tacoma double cab. 4X4 TRD package, rear locker. Imperial Jade Mica. Stock, stock, stock. It will have to stay that way for a while. (sigh) Hey!! I got some husky liners!!!

06-02-2003, 08:29 AM	#13 (permalink)
az4x4runner Registered User Join Date: Nov 2002 Location: Prescott, Arizona Posts: 1,238	I know someone who has 202k miles on their 3.0 and it's still running great, they haven't had any problems with it either. Oh yeah, mine with 95k miles gets around 21mpg highway. __________________ 1995 4Runner - 3.0 - Auto - 4.88s 31x10.50 ~ Front: Durango Radial M/T ~ Rear: BFGoodrich M/T KM2 - Aisin Manual Hubs - Extended Diff. Breathers - Extremely Low Profile Bumpstops - WabFab Sway-Bar Disco's - Downey IFS Truss - Downey HD Coils - Arizona Pinstriping Last edited by Silver954Runner; 06-02-2003 at 11:04 AM.

06-02-2003, 08:59 AM	#14 (permalink)
Bumpin' Yota Registered User Join Date: Feb 2003 Location: Sarasota, FL Posts: 3,639	Agreed 1Runner, the 3.0L in a stock 4runner should get 19-21 on the highway if the engine is in running order. (No gunning the engine and 70mph only, drop it to 65 and watch the mpg soar!) Id bet dollars to donuts that the stock 3.0s that are getting horrible gas milage need a new O2 sensor and new fuel filter. __________________ 3vze, 4x4, sr5, 90, auto, LSD 2x dB Drag World Finalist 2003 Nopi Nat. Street B champ 2004 SBN Street C champ 2004 SBN Advncd NW Champ 2004 Former WR Holder in NW. SPL: 159.8db @ 42hz In loving memory of Jamie Riggs 5/15/85 - 10/8/04

06-02-2003, 09:23 AM	#15 (permalink)
doink Contributing Member Join Date: Jul 2002 Location: Atl. Georgia Posts: 3,078	i am getting about 13 miles per gallon on my yota..is whats the deal with that? __________________ -m. buy my bands record on iTunes LISTEN TO MY BAND PLEASE

06-02-2003, 10:08 AM	#16 (permalink)
livelarg Contributing Member Join Date: May 2003 Location: Oklahoma city Posts: 308	I have had my 3.0 88" 4runner for about 2 months now. I was depressed by how bad my milage was when I first got it. I was getting 12-14 in the city. two things: First was my driving. I was trying to accelerate quickly all of the time, then trying to drive too fast. when I just relaxed a bit, I started getting about 16-17 mpg. Second, my truck was owned for the past ten years by a middle aged woman that did not anything about cars. Needless to say, she did not always keep the car in tune, though she swears that she changed the oil religiously. I already did the ISR mod a couple of days ago, and I am happy with that. I am ordering an Amsoil filter. And this week I am going to do a tune up with NGK V-power plugs and new wires and change the fuel filter. In a couple of weeks, I am going to change the trans, transfer, and differentials with synthetics. Mobile 1 I think unless someone knows a better synthetic. Hopefully this will help out some with the power and MPG. I will post the results of all of this when I am done. BTW, I bought the truck with 226,000 miles on it, and it runns perfect, and looks great! I drove it once and decided I had to have it. I sold my 2000 Nissan Frontier crewcab to get this 4Runner. My wife thought I was crazy, but I love my new truck! __________________ LIfe's short, Drive Hard! 88' 4Runner. ISR Mod, Airbox Mod. Kenwood CD with Hardwired Ipod 40 gig Infinity 6.5 seperates with Infinity Basslink Sub 91' Landcruiser 80 series 2" body lift 32-12.5 Swampers Hi-lift Jack Kenwood CD with Hardwired Ipod 40 gig

06-02-2003, 01:10 PM	#17 (permalink)
Praufet Contributing Member Join Date: May 2003 Location: Fort Worth/College Station, TX Posts: 835	The dohc camry engine that I have been musing about is known as the 1mzfe. It has the same 87.5mm bore that the 3vz does. Does this sound like a head swap would be possible? I know the newer 1mz's use vvt, so that would require some more work, but they even have a supercharger for the 1mz. So this may be an option for the more budget minded of us. A head swap would be a lot cheaper and easier than and engine swap. Any feedback about suggestions or concerns you guys have would be great. edit: The 92-93 Toyota camry had the 3vzfe which is a dohc version of the 3vz-e. Sounds to me like that would work. I found a place that sells new 3vzfe heads for 475. If you guys could look around for better deals that'd be great, once I get some money I think I'm gonna head to the junk yard. Last edited by Praufet; 06-02-2003 at 01:15 PM.

06-02-2003, 02:17 PM	#18 (permalink)
oly884 Contributing Member Join Date: Dec 2002 Posts: 4,703	O.K. every one knows that the 3.0 L engine isn't that great, the same with the ford 3.0L V-6's, they arn't great either. BUT why? I know it's not just the fact that it has a single over head cam. I can't really figure it out. My friend has a ranger with the 3.0 L V-6 in it and it too is gutless.

06-02-2003, 03:21 PM	#19 (permalink)
L33T35T 4Runner Contributing Member Join Date: Oct 2002 Location: Fountain Valley, CA (so cali) Posts: 2,005	my mom has a 3.0 in her 2000 sienna and its a power house, 196hp also, the highlanders also have a 3.0 with 220hp I'm guessing both are DOHC __________________ 95 4Runner SR5 3.0l. V6 2 wheel drive baby! 31" Bridgeston Dueler A/T Revos. Downey 1.5 Coils. Doetsch MV-12 Shocks. Brembo Rotors. Performance Friction Pads. Pioneer head unit with 1 12" Pioneer woofer. XM Radio. RB Headlight Harness w/ Sylvania SilverStars New to the family: 85 4Runner 22RE, 4x4, 5 spd, SFA. 31" BFG All Terrain T/A KOs, genuine Walmart seat covers, "Dual" stereo, XM Radio, RB Headlight Harness w/ Sylvania SilverStars. Onboard air. Has been seafoamed to hell

06-02-2003, 05:13 PM	#21 (permalink)
livelarg Contributing Member Join Date: May 2003 Location: Oklahoma city Posts: 308	Lets get back to the head transfer from the camary. I have no Idea what i would take to change the SOHC to the DOHC, but It could be cool to try if they would fit on them. How would a person find out about it? __________________ LIfe's short, Drive Hard! 88' 4Runner. ISR Mod, Airbox Mod. Kenwood CD with Hardwired Ipod 40 gig Infinity 6.5 seperates with Infinity Basslink Sub 91' Landcruiser 80 series 2" body lift 32-12.5 Swampers Hi-lift Jack Kenwood CD with Hardwired Ipod 40 gig

06-02-2003, 08:41 PM	#22 (permalink)
Bolverk Registered User Join Date: Jun 2003 Posts: 38	SOHC to DOHC 3vz head swap Dunno if it would work at all I think it would take a lot of modding the 3vz to fit the DOHC. The timing would have to be changed to accomodate the DOHC the VVT requires different computer, might need to change the fuel tank and pump might need to be different. mebbe some of you might be interested in doing a project like that, but it may or may not work quite like you want. I dont know of anybody thats done such a thing...or even tried, but its pretty risky and costly.... I for one have no money for such a project, and even if I did, I would probably just prefer to go with a 5vz, which in my opinion would be an easier project especially for the money required, and so far as Ive heard it turns out pretty nice. Plus the TRD supercharger is floating around a reasonable prices, which I would definitely opt for if I had the 5vz. IF someone decides to try making the 3vz into a Dohc ITs definitely a project you should put up here on the messageboard and tell us all how it goes. If you got the time and money go for it. ---------------------------------------------------------------------------------- I would also like to mention that engine size doesnt mean that its weak or not. take for instance the subaru WRX. It has a 2.0 L 4 cyl boxer engine that produces 227 horsepower. or the Isuzu engine currently used in the rodeos and rodeo sports, 3.2 L v6 produces 205 HP. Its not the size, rather the design of the engine and what its been tuned for. I personally think that the 3vz was poorly designed and that toyota should have stuck the the 22RET. I would love to find an 86-87 4runner or truck with the turbo, which produced more power than the 3vz. The 3vz has been plagued with head gasket problems. That aside the 3vz is not all that bad my 94 has 241,000 miles so far, but It has had a rebuild. As long as the head gasket doesnt blow its pretty good, and if fuel economy is a problem, just be glad you dont drive an H2. ------------------------------------------------------------------------------------ Last edited by Bolverk; 06-02-2003 at 08:52 PM.

06-02-2003, 09:24 PM	#24 (permalink)
Praufet Contributing Member Join Date: May 2003 Location: Fort Worth/College Station, TX Posts: 835	The 3.0 that is in new cars is the 1MZFE and it is quite the power house, it has become quite the all purpose motor being in everything from the sienna to the solora. This motor replaced the 3VZFE which is DOHC. For some odd reason they decided to put the SOHC version, the 3VZ-E, in the four runner. The 3VZ was way before VVT, and quite a lot of 1MZFE's are available with out VVT seeing as it is a fairly new technology. The swap from SOHC to DOHC should be fairly straight forward since it is pretty much the same engine. Same block different head. Shoudln't be too much hard then swapping heads on a honda. If any of you could talk to a mechanic who specializes in toyotas and find out what hard ware would be needed that'd be awesome. On first thoughts all you would need would be the heads, new head gasket, and probably some timing accesories(timing chain and such). Oh yeah, check out my mad researchin' skillz boi!

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this sucks	hektikwon	95.5-2004 Tacomas & 96-2002 4Runners	1	01-10-2005 03:12 PM
Incubus Sucks	GoudyMan	Off Topic Talk	53	03-08-2004 11:13 PM