3.4 swap started - Page 28

mt_goat · 05-28-2008, 02:24 PM

That calulator says you are doing 2343 rpms at 75mph. Sound right?

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mastacox · 05-28-2008, 02:31 PM

Yeah I had the wrong gear ratios. Here are the ones I found now:

Toyota A340F Auto Transmisison
1st- 2.804
2nd- 1.531
3rd- 1.000
4th- 0.705
Rev- 2.393

With those numbers I'm pulling 2300rpm at 75mph, which sounds about right. I personally wouldn't mind having 4.56's, but the jump from 4.30-4.56 is so small that it's pretty much not worth it compared to other things I want to buy

I'm curious how much my 4Runner weighs with a full tank of gas and me in it... I'm guessing about 4500-4700 lbs but I'm not sure.

AH64ID · 05-28-2008, 02:59 PM

Brian, is there a reason you think in absolute psi? On my turbo diesel the wastegate opens at 32psi, no matter what altitude, even thou I live above sea level 32psi is still 32 psi... just like at 2-3 psi you would still be below absolute pressure, due to the altitude there is a positive flow to it. It does take more work to equal the same boost at elevation thou...

Here is a tranny chart I made...

mastacox · 05-28-2008, 03:16 PM

I just mentioned it to Dale because our FTC's have MAP (manifold absolute pressure) sensors on them and therefore think in terms of absolute pressure rather than gauge pressure. We do have the TRD boost gauge which reads gauge pressure, but it does nothing to control our engines' tunes.

As my tune is set right now, the FTC takes over the oxygen sensor's signal at 1psi absolute pressure, which ends up being about 4-5psi gauge pressure where I live. For a while I was running it so that it kicked in at 0 psi alsolute, but the lower I go the more problems I have with the FTC freaking out on me, so at 1psi it will have to stay. Hopefully I'll get W/MI injection in the future to get a little extra oomph and to make sure my EGT's stay in line (I'll have to get an EGT gauge too, which will suck to install).

AH64ID · 05-28-2008, 03:29 PM

Gotcha, yeah I figured that was it as I was lighting the BBQ.... My CTD works the same, thou in gauge pressure it always seems to open the wastegate at 32psi.. .thou thats disabled now.

EGT's are a pain thats for sure... too bad the roots style would be a nightmare, if even possible, to intercool. I know they have an aftercooler on the blower for the 4.0.

What do your intake temps look like compared to ambient?

mastacox · 05-28-2008, 03:54 PM

Quote:

Originally Posted by AH64ID

What do your intake temps look like compared to ambient?

Intake temps are essentially the same as ambient according to my OBD-II reader, I have no idea what my CDT is but it probably isn't too bad since it's relatively cold here...

mastacox · 05-29-2008, 10:35 AM

So I looked at rpms today on the way to work, I about 2075 rpm at 65mph, and about 2400 rpms at 75mph. So the calculations based on the transmission ratios seem to be correct.

Just for fun, I whipped up a graph comparing engine/vehicle speed and 4.30 vs 5.29 gears. Seems about right, subject to some slight tire diameter error.

mt_goat · 05-29-2008, 10:55 AM

Quote:

Originally Posted by mastacox

So I looked at rpms today on the way to work, I about 2075 rpm at 65mph, and about 2400 rpms at 75mph. So the calculations based on the transmission ratios seem to be correct.

Just for fun, I whipped up a graph comparing engine/vehicle speed and 4.30 vs 5.29 gears. Seems about right, subject to some slight tire diameter error.

Interesting graph, I think I see now why that 4runner out ran me on that hill. You have a really sweet 3rd gear that takes you to the peak of the power band in the 80-90mph area. I was lugging some in OD, he was probably in 3rd gear.

Why did you stop the graph at 100mph, lets see what your top speed would be at redline, LOL.

mastacox · 05-29-2008, 11:08 AM

LOL, here ya go Dale. At 5500 rpm in 4th gear, I'd be doing 177 miles per hour. Fortunately, my tires explode at 122 miles per hour, and the speed limiter kicks in at what, 102?

You should definitely shift out of O/D if you want to pass with authority.

mt_goat · 05-29-2008, 11:15 AM

Quote:

Originally Posted by mastacox

LOL, here ya go Dale. At 5500 rpm in 4th gear, I'd be doing 177 miles per hour. Fortunately, my tires explode at 122 miles per hour, and the speed limiter kicks in at what, 102?

You should definitely shift out of O/D if you want to pass with authority.

Wow, about 145mph for me. I guess I'm not geared too low then, LOL. Can you image 33" mud tires going 145mph, I wonder if they ever hit that in the Baja 1000.

Texas_Ace · 05-29-2008, 11:18 AM

So with my 3.91 gears i am good for what? 200mph+?

Oh, and the speed limiter kicks in at 109 BTW

mt_goat · 05-29-2008, 11:24 AM

Quote:

Originally Posted by Texas_Ace

Oh, and the speed limiter kicks in at 109 BTW

You found that out huh?

BTW there is a way around that limiter, URD used to sell the little gadget to do it. I guess their lawer told them to quit selling it.

Texas_Ace · 05-29-2008, 11:26 AM

Quote:

Originally Posted by mt_goat

You found that out huh?

BTW there is a way around that limiter, URD used to sell the little gadget to do it. I guess their lawer told them to quit selling it.

LOL, i never said that..........

And yeah i have heard there is a way around it, depending on price i might do that just for when i dyno it as the speed limiter kicks in at about 5000 RPM and there is still 1k rpm to go. We will see.

mastacox · 05-29-2008, 11:26 AM

BFGoodrich Baja T/A's are "T" speed rated, 124mph. I doubt trophy trucks get up past 110 miles per hour much in the Baja.

Quote:

Originally Posted by OffRoad.com

[37" Baja T/A]...highest in the industry 124mph "T" speed rating, it pulls as much as a 30mph safety margin over the competition...

...It takes a tough tire to run for 30 minutes at 140mph across a 120 degree dry lake bed. And this is toughness that is built into every Baja T/A.

mt_goat · 05-29-2008, 11:30 AM

Quote:

Originally Posted by mastacox

BFGoodrich Baja T/A's are "T" speed rated, 124mph. I doubt trophy trucks get up past 110 miles per hour much in the Baja.

Cool

mt_goat · 05-29-2008, 11:34 AM

Quote:

Originally Posted by Texas_Ace

LOL, i never said that..........

And yeah i have heard there is a way around it, depending on price i might do that just for when i dyno it as the speed limiter kicks in at about 5000 RPM and there is still 1k rpm to go. We will see.

That may be the only way I'll ever hit 109mph, sitting on a dyno, LOL.

mastacox · 05-29-2008, 11:37 AM

So Dale have you determined if you have a narrow-band O2 sensor or a wideband O2 sensor yet? I hear URD is working with SplitSecond on a new ESC unit that will work "perfectly" with Toyotas that have narrowband sensors, I may have to look into getting one...

AH64ID · 05-29-2008, 11:43 AM

Quote:

Originally Posted by mt_goat

That may be the only way I'll ever hit 109mph, sitting on a dyno, LOL.

Any plans to run it on the rollers?

mt_goat · 05-29-2008, 11:46 AM

Quote:

Originally Posted by mastacox

So Dale have you determined if you have a narrow-band O2 sensor or a wideband O2 sensor yet? I hear URD is working with SplitSecond on a new ESC unit that will work "perfectly" with Toyotas that have narrowband sensors, I may have to look into getting one...

Not for sure, I haven't taken it out to look. Everything points to it being a wideband though.

I still run in open loop a lot just cruising down the highway. Most of the time its just slightly rich though, like around 13.9-14.2 area. Although I did have one little scare in the middle of my trip cruising along about 65mpg, very low throttle and I see my A/F like around 11 and dropping. I was like WTF??? I let off the gas and coasted then went back to speed and everything was fine after that, it never did it again. Maybe it freaked out like yours huh?

mt_goat · 05-29-2008, 11:51 AM

Quote:

Originally Posted by AH64ID

Any plans to run it on the rollers?

No plans, it would be nice sometime though. Not sure if there is even a place to do it around here.

mastacox · 05-29-2008, 12:01 PM

Yeah, "tricking" our engines into doing what we want is always an imperfect science...

I still want to look into an SMT7 to replace my FTC1. The SMT7 uses wideband O2 input for tuning, so your fuel map is a bunch of AFR values rather than fuel trims. You just tell it the AFR to aim for and it does what it needs to get there I guess. Sounds pretty frickin' sick, and it has two hot-swappable maps so you could run agressive and conservative maps. In theory it also can control a 7th injector, so I might be able to use it to control a W/MI kit as well...

mt_goat · 05-29-2008, 12:07 PM

Quote:

Originally Posted by mastacox

Yeah, "tricking" our engines into doing what we want is always an imperfect science...

I still want to look into an SMT7 to replace my FTC1. The SMT7 uses wideband O2 input for tuning, so your fuel map is a bunch of AFR values rather than fuel trims. You just tell it the AFR to aim for and it does what it needs to get there I guess. Sounds pretty frickin' sick, and it has two hot-swappable maps so you could run agressive and conservative maps. In theory it also can control a 7th injector, so I might be able to use it to control a W/MI kit as well...

Now that sound great! Why don't you lead the way Brian.

Texas_Ace · 05-29-2008, 12:18 PM

Quote:

Originally Posted by mt_goat

Now that sound great! Why don't you lead the way Brian.

What he said, i am interested as well now that i am about to join ya'll in the SC club.

Of course first i need to get it rebuilt and installed....

mastacox · 05-29-2008, 12:51 PM

Quote:

Originally Posted by mt_goat

Now that sound great! Why don't you lead the way Brian.

Quote:

Originally Posted by Texas_Ace

What he said, i am interested as well now that i am about to join ya'll in the SC club.

Of course first i need to get it rebuilt and installed....

I want to, but it won't be for a while yet. It would be totally sweet if I could find one for cheap used, but for now I'll just have to stick with what I've got. It might be possible to fake out the oxygen sensor using one of the analog voltage ouputs on the SMT7 (14.7 AFR on a narrow-band oxygen sensor is just a constant 0.50 Volts, nothing too complicated about that), but more likely I will need to wait until SS comes out with their "ESC-2.0".

I do think I'm going to get an SMT7 rather than go full data acquisition however, since they both would cost about the same (actually data acquisition would be more $$$) and are both to try and solve the same problem- easier tuning with the possibility of upgrades later on. Supposedly you can get a base-level standalone engine management kit from Megasquirt for close to the price of an SMT7, but going standalone would be biting off a lot more that I would want to chew I think...

mt_goat · 06-30-2008, 07:28 PM

I made a support bracket for the down pipe today. There have been a few guys having problems cracking the crossover so I wanted to help support it and hopefully avoid that problem. Toyota has the down pipe supported in this area from the factory so maybe they know best. In fact I made this bracket from an old factory bracket.

05-28-2008, 02:31 PM	#677 (permalink)
mastacox Contributing Member Join Date: Dec 2003 Location: Los Alamos, NM Posts: 2,651	Yeah I had the wrong gear ratios. Here are the ones I found now: Toyota A340F Auto Transmisison 1st- 2.804 2nd- 1.531 3rd- 1.000 4th- 0.705 Rev- 2.393 With those numbers I'm pulling 2300rpm at 75mph, which sounds about right. I personally wouldn't mind having 4.56's, but the jump from 4.30-4.56 is so small that it's pretty much not worth it compared to other things I want to buy I'm curious how much my 4Runner weighs with a full tank of gas and me in it... I'm guessing about 4500-4700 lbs but I'm not sure. __________________ Brian 1998 4Runner SR5

05-28-2008, 03:16 PM	#679 (permalink)
mastacox Contributing Member Join Date: Dec 2003 Location: Los Alamos, NM Posts: 2,651	I just mentioned it to Dale because our FTC's have MAP (manifold absolute pressure) sensors on them and therefore think in terms of absolute pressure rather than gauge pressure. We do have the TRD boost gauge which reads gauge pressure, but it does nothing to control our engines' tunes. As my tune is set right now, the FTC takes over the oxygen sensor's signal at 1psi absolute pressure, which ends up being about 4-5psi gauge pressure where I live. For a while I was running it so that it kicked in at 0 psi alsolute, but the lower I go the more problems I have with the FTC freaking out on me, so at 1psi it will have to stay. Hopefully I'll get W/MI injection in the future to get a little extra oomph and to make sure my EGT's stay in line (I'll have to get an EGT gauge too, which will suck to install). __________________ Brian 1998 4Runner SR5

05-28-2008, 03:29 PM	#680 (permalink)
AH64ID Contributing Member Join Date: Dec 2002 Location: Idaho Posts: 4,638	Gotcha, yeah I figured that was it as I was lighting the BBQ.... My CTD works the same, thou in gauge pressure it always seems to open the wastegate at 32psi.. .thou thats disabled now. EGT's are a pain thats for sure... too bad the roots style would be a nightmare, if even possible, to intercool. I know they have an aftercooler on the blower for the 4.0. What do your intake temps look like compared to ambient? __________________ -John '05 Dodge 3500 SRW 4x4 SLT 5.9 Cummins QC LB NV5600 2003 SR5 4Runner, V6 4WD. 1" cornfed lift Previous Toyota's '92 Red Truck NALA Speed doesn't kill, its the sudden stop that hurts.

05-29-2008, 10:35 AM	#682 (permalink)
mastacox Contributing Member Join Date: Dec 2003 Location: Los Alamos, NM Posts: 2,651	So I looked at rpms today on the way to work, I about 2075 rpm at 65mph, and about 2400 rpms at 75mph. So the calculations based on the transmission ratios seem to be correct. Just for fun, I whipped up a graph comparing engine/vehicle speed and 4.30 vs 5.29 gears. Seems about right, subject to some slight tire diameter error. Attached Thumbnails __________________ Brian 1998 4Runner SR5

05-29-2008, 11:08 AM	#684 (permalink)
mastacox Contributing Member Join Date: Dec 2003 Location: Los Alamos, NM Posts: 2,651	LOL, here ya go Dale. At 5500 rpm in 4th gear, I'd be doing 177 miles per hour. Fortunately, my tires explode at 122 miles per hour, and the speed limiter kicks in at what, 102? You should definitely shift out of O/D if you want to pass with authority. Attached Thumbnails __________________ Brian 1998 4Runner SR5

05-29-2008, 11:37 AM	#692 (permalink)
mastacox Contributing Member Join Date: Dec 2003 Location: Los Alamos, NM Posts: 2,651	So Dale have you determined if you have a narrow-band O2 sensor or a wideband O2 sensor yet? I hear URD is working with SplitSecond on a new ESC unit that will work "perfectly" with Toyotas that have narrowband sensors, I may have to look into getting one... __________________ Brian 1998 4Runner SR5

05-29-2008, 12:01 PM	#696 (permalink)
mastacox Contributing Member Join Date: Dec 2003 Location: Los Alamos, NM Posts: 2,651	Yeah, "tricking" our engines into doing what we want is always an imperfect science... I still want to look into an SMT7 to replace my FTC1. The SMT7 uses wideband O2 input for tuning, so your fuel map is a bunch of AFR values rather than fuel trims. You just tell it the AFR to aim for and it does what it needs to get there I guess. Sounds pretty frickin' sick, and it has two hot-swappable maps so you could run agressive and conservative maps. In theory it also can control a 7th injector, so I might be able to use it to control a W/MI kit as well... __________________ Brian 1998 4Runner SR5

06-30-2008, 07:28 PM	#700 (permalink)
mt_goat Contributing Member Join Date: Nov 2002 Location: Oklahoma State Posts: 8,919	I made a support bracket for the down pipe today. There have been a few guys having problems cracking the crossover so I wanted to help support it and hopefully avoid that problem. Toyota has the down pipe supported in this area from the factory so maybe they know best. In fact I made this bracket from an old factory bracket. __________________ ~Dale~ 93 4X4 ext-cab, auto, SR5, 3.4 V6, supercharged, 2.1" pulley, URD fuel mods, Aquamist WI, IPT valve body mod, dual cases, 4" superlift front, Alcan springs rear, 33 BFG MT, ARB locked front & rear, 5.29 US Gears, RB 1" Body Lift, 1.5" ball joint spacers, manual hubs, TJM T-17, Warn m8000. Last edited by mt_goat; 06-30-2008 at 07:30 PM.

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