If your intake deep in mud you have a lot of stuff you need to be paying attention to, not just your turbo. How many of us intentionally go into mud as deep as our intake? I'm guessing not that many. If you do visit that deep of mud frequently, you should probably be building your rig as such and protecting your turbo is just one of the MANY things you need to protect.

Asha'man had a good point; It's typically easier to package a turbo system in an engine bay with an inline motor, where a roots style blower fits very nicely between the heads of a V motor.

FWIW This the second vehicle I have done a fully custom turbo setup on and I have no welder nor do I know how to weld. It's really not that hard, it just takes longer then a weekend and yeah there probably aren't any instructions for you to follow...

Is it more complex? Yes, it has more moving parts there for its a more complex system.

Is it worth it? That's for you to decide. For me, underpowered vehicles really frustrate me. The first time I drove a 22RE powered truck (before I knew the turbo's existed) I was so torn. Loved the truck but was very frustrated by the lack of power.

Turbo's made these Toyota pickups/4Runners the ultimate trucks, for me.

 

I think that's one of the biggest reasons people go turbo. to achieve the same power levels it'll cost you 3-4 times as much. You can only spin a s/c so fast before the bearings let go and bad things happen. there is a good argument that most s/c kits are bolt-on and go but remote-mount turbo set-ups are pretty damn straight-forward too.

there are alot of myths that are always perpetuated in these arguments about turbo vs. s/c.

a centrifugal s/c setup doesn't build boost until higher in the rpm range so it drives exactly like a non-s/c'd car under normal conditions. my girlfriend drives my truck all the time and she hardly noticed any difference after the s/c during normal driving around town.

A roots-type or eaton blower pushes the same amount of air per revolution into the engine at any RPM, they are a fixed displacement supercharger. you'll obviously get more low end power with a fixed-displacement setup because they build boost immediately but they're usually more limited on the top-end compared to a centrifugal.

the boost from a turbo is limited by the wastegate, not the speed of the compressor like it is on a s/c. this means you usually get full boost all at once rather than building it more slowly like on a centrifugal s/c. it's not so much turbo lag that makes a turbo'd car feel so much different than a s/c'd car but the fact that you're getting all your boost essentially at one time.

my gas mileage went up by 1-2 mpg when I supercharged (centrifugal) my 4.3 and that's pretty common. I'm pretty sure I've read that mileage in the 3.4's stays the same or increases with the TRD blower doesn't it? the efficiency of the engine is improved at lower RPMs by decreasing the intake vacuum and it's enough to overcome the extra engine power it takes to drive the supercharger belt. the only time gas mileage suffers is when you're beating on it.


the intake charge temperature argument doesn't apply either - it's just as easy and common to intercool a s/c setup as it is a turbo setup. roots setups are a bit more complicated but it's been done plenty of times with air-liquid systems - almost every s/c'd ford is intercooled (lightning, t-bird supercoupe etc...).

Fuelling is an issue with any forced induction setup. Alot of cars that weren't designed to be high-performance vehicles don't have easily swappable fuel injectors. there's a bunch of solutions - basically its up to the size of your wallet as to which one is best.

Edit: forgot to add that a blow off or recirculation valve is also necessary on a s/c setup. if you let off the gas quickly while under boost that pressure has no where to go, it blows back through the compressor and can damage the impeller. you can also get weird surging problems during part-throttle driving without a recirc valve on a roots blower. I don't know if it's just my s/c setup but the only time i've ever actually heard the BOV is with the hood open on the dyno

 

Your truck sounds badass, where in Denver are you?

 

Thanks.. It's a lot of fun...

I'm at Alameda and I25ish..

 

Nice, that's pretty close to me (Arapahoe and I25ish). We should drink a beer sometime.

 

The time and research, that this guy put into that, is what I'm talking about.

Being as i just blew my head gasket last night, my 3RZ/R150F T25 swap has just upped it's standing on my priority list. When i pulled out of my driveway this morning, it was like watching Uncle Buck (Jon Candy) pull away in his beater.

 

our volvo 850 turbo 1997 is such a sweet ride. fast - 0 to 60 in 7 sec flat
top end is 135 mph governed due to the tires. oh and it gets 24 on the hwy, 21 around town. 18 mpg if you drive like a nut.

1984 kawasaki gpz 750 turbo - flat below 4000 rpm then HOLD ON.

most awesome car ever driven 1978 Porsche 930 turbo - no car id rather have.

 

For sure! I head that way all the time, one of my customers is down that way..

Hey, did you see this thread?
https://www.yotatech.com/forums/f15/...rs-132254-new/

You should come wheelin' with us!

Hijack over..

...Turbo's RULE!

 

I very much prefer turbos to superchargers. I like the fact that turbos are load-dependent, not engine speed-driven, the wastegate governs the boost without regard to elevation changes, no parasitic drag like a belt-driven supercharger, and most importantly, turbos sound awesome!

Here's mine on the dyno with the turbo screaming away.

Despite the large turbo, you'll note how quickly the boost jumps to 15 psi and stays there in this video.

 

Right on. Hit me up sometime.

Posted up, never been wheelin' but it sounds fun.

TURBOS FTW!!!!

 

I have had both the TRD S/C and now a Custom Turbo Setup on my 99 4runner. Both has thier advantages:

Top End Power - Turbo
Off the line power - S/C (but my turbo (t3/t4) catches up in a hurry)
Fun to Drive - Turbo
Reliability - Equal
Tuning Ease - S/C
Upgrade Potential - Turbo
Ease of installation - S/C

This all being said - I just broke a rod running 15 lbs of boost. Don't think I would have with the S/C as the power potential isn't there.

 

I am using the URD port fueler and AIC x6 for fuel - MAPECU2 for timing, o2 adjust (tuning in closed loop), and MAF voltage clamp. It works about as good as a piggyback can in my application I think.

 

I have the Saabaru Aero (turbo) in an automatic. Very slow until 3k, then it is a totally different car. We shall see how it does in the snow at low RPM's for me, but all I will say for being in the boost is that I make it over Berthoud Pass in the snow way faster than in the 4runner. For the 4runner I would prefer a supercharger for the low end and low speed benefits.

I was able to break the Saabaru loose on a dry road with hankook iPike snow tires, that had liquid mag chloride on it. That s**t is way nasty to drive on. The tires did not break loose like that on snow.

 

the 4cyl are easier to turbo cause a turbo is cheaper and lighter than a supercharger but the lag and HEAT have driven me away. a supercharger will pobably last you longer also because of less heat.

 

not trying to be an azz, but do you have any idea what you are talking about or how each of them work? doesnt sound like it, so ill inform you that turbos produce and pump much less heat into a motor compared to a stupidcharger, plus you can intercool them, and no, a supercharger will not last you longer than a turbo, and are much less efficient than turbos. You will not have any "lag" if your system is properly designed and have the correct turbo for your specific application.

 

greedy - i wanted to ask you how you like the 6 port fueler. Im about to get it for my setup - was it easy to tune? which injectors did you go with? any hood clearance issues?

 

They both have their place.

Personally I would take a supercharger over a turbocharger any day, and I've never seen any evidence to sway my opinion towards turbos.

 

why a supercharger? what makes them better in your opinion?

 

The port fueler has been easy to tune, reliable, and looks cool

I have 30# injectors in there which are more than I will ever need, but they were included with it when I bought it (a long time ago when they were still refining the older model). There are no hood clearance issues with mine, but I do know of someone who had an issue on thier 2000 4runner. I have a hood scoop on mine though and I think it helps. Also, I took out the liner underneath the hood to provide more room.

Installing it is very easy and it produces consistent results. I am sure if you get it you won't be dissapointed.

Good luck and let me know how your set-up turns out!

 

I like turbos since they aren't limited to engine speed and can easily be upgraded and can make up for lesser oxygen at higher altitudes meaning they can make the same lbs of boost they make as sea level,SC lose pressure up here due to the engine not making as much power on it's own.