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ct26 part 2
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Originally posted by pontiacjeffBrian, what ecm did you use to turbocharge the 3400DOHC? What trans are you using? I am building one right now. '96 3400DOHC in a '90TGP, 4T65E-HD w/separate pcm, T3/T04E 60-1. I'm huntin' for bear!
Lastly, we call it the 3.4 dohc, by saying 3400 it is associated with the pushrod Grand Am motor and it messes with me when it is late and I am under the influence of a beverage of a alcoholic nature.
However it does sound liek a good project, I bet the 96s will like boost more than the earlier motors due to their timing and heads.
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MyGt: how's it run? and have you ever driven a 3.4 5spd with the BCFA code?
Reason I ask is that I tried the $8f mask for about a day, I copied over all the 3.4 spark and main VE tables to keep my engine in one piece but the thing bucked and chugged and was being quite difficult when it came to low-end drivability. This was behind a 4t60e so a 5spd I would assume be a complete terror, it left me so hopeless that I ended up tracing down the MAP routines in the $df mask and re-writing them for 2bar. How much of the 3.4 stuff did you end up copying over?
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Maybe I should have listeded to you. I went too big on the turbo. After having my cam belt replaced and cams retimed to stock(no clue what they were), my spool up time INCREASED by 500 rpm! It's great after 4k rpm still, but definitely a bit too weak down low. I'll probably try a smaller a/r housing soon(from 0.7 to 0.5.
Tim1995 Z34 - T04E "60" trim, 42.5 lb/hr injectors, AEM WBO2, FFP UD&DB, 3" exhaust, 2800 stall, shift kit, tranny cooler, Powerslot, Hawk HPS, rear disc conversion, KYB, Eibach, HMS F&R STB, Fittipaldi Force 18" wheels, big stereo, lots more coming eventually...
325 whp 350 lb-ft
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Tim, what turbo are you using? Is it a T3 turbine housing? I am using a hybrid T3 (.82 A/R turbine housing with a stage III GT35 turbine wheel) / T04E (.60 A/R Super 57 compressor wheel). I have not run it yet, but it should be perfect for these engines.
Let's face it, you are never going to get a 3.4 cammer to pull below 4K, period. Why try to make it do what, by design, it isn't capable of doing? Turbo the engine according to it's intended powerband. A medium to large T3 should begin to boost around 3500 on a 3.4L engine. If you hate the lag, use a looser converter or do a 3.73 gear swap. Or run a 5-speed!
Another way to get more bottom end out of a turbo cammer is to advance the exhaust cams 4deg. This will decrease overlap and help the turbo boost a little quicker. You could even retard the intakes 4deg and really feel the boost come on hard and pull to 7K.Jeff Ianitello
Engineered Performance
Atlanta, GA.
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Didn't finish in time for GPG. it's a good thing... Ivan came through Atl and found every possible place to leak into my house! The front bay window, front door, front basement wall... we had rain hitting the house horizontal. It's going to be a busy weekend.Jeff Ianitello
Engineered Performance
Atlanta, GA.
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Originally posted by timgMaybe I should have listeded to you. I went too big on the turbo.
Tim
I've seen Supra dyno charts and for streetability the .58 housing seems to have pretty good results. Less peaky up top, less overall power, but the powerband is quite flat and it spools up around 3k on the Supra. How similar are the results for the 3.4, who knows.
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I'm using a full T04E with a 60 trim compressor and a T04E .68 a/r on center exhaust housing. I don't know the specs on the turbine wheel itself, the turbo didn't say and the shop didn't know. I'll probably swap to a one size lower on center turbine housing. Right now, boost starts at 3000 rpm, I get usable boost at 3500 rpm(the same place it started making power NA) and I have full boost by 4000 rpm.
One of my stock cams(or maybe two on the same head) was off by an entire tooth. I may have to try that com timing that you suggest.
My T04E boosts about where your example of a T3 would. It does take a second or so to spool up after flooring it in higher gears though. That's where a BB center cartridge would be helpful.
I have a higher stall speed torque converter right now. I'll spin the tires for a second once I floor it and then a second later when the turbo spools.
Tim
Originally posted by pontiacjeffTim, what turbo are you using? Is it a T3 turbine housing? I am using a hybrid T3 (.82 A/R turbine housing with a stage III GT35 turbine wheel) / T04E (.60 A/R Super 57 compressor wheel). I have not run it yet, but it should be perfect for these engines.
Let's face it, you are never going to get a 3.4 cammer to pull below 4K, period. Why try to make it do what, by design, it isn't capable of doing? Turbo the engine according to it's intended powerband. A medium to large T3 should begin to boost around 3500 on a 3.4L engine. If you hate the lag, use a looser converter or do a 3.73 gear swap. Or run a 5-speed!
Another way to get more bottom end out of a turbo cammer is to advance the exhaust cams 4deg. This will decrease overlap and help the turbo boost a little quicker. You could even retard the intakes 4deg and really feel the boost come on hard and pull to 7K.1995 Z34 - T04E "60" trim, 42.5 lb/hr injectors, AEM WBO2, FFP UD&DB, 3" exhaust, 2800 stall, shift kit, tranny cooler, Powerslot, Hawk HPS, rear disc conversion, KYB, Eibach, HMS F&R STB, Fittipaldi Force 18" wheels, big stereo, lots more coming eventually...
325 whp 350 lb-ft
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The T4 .68 turbine housing is your problem. Also, the o-c housings do not spool up like the tangential housings. Hopefully it's an O-trim turbine wheel (measures just over 2.25" when looking into the outlet side). If it's a P-trim (just over 2.5"), that's what I use in my 6.6L V-8 turbo, and that's way too big. Really, you need a T3 .63 or .82 A/R depending on how fast you want it to boost.
How do you control fuel??? (Beware the FMU. Stock injectors shut off at about 70psi.) What size injectors? MAP? MAF?
I plan to run the 95 ECM with 50# injectors, LS1 MAF, Perfect Power SMT5 piggy-back to control the MAF frequency and ignition timing.
I should finish it this month (or next).Jeff Ianitello
Engineered Performance
Atlanta, GA.
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Originally posted by pontiacjeffThe T4 .68 turbine housing is your problem. Also, the o-c housings do not spool up like the tangential housings. Hopefully it's an O-trim turbine wheel (measures just over 2.25" when looking into the outlet side). If it's a P-trim (just over 2.5"), that's what I use in my 6.6L V-8 turbo, and that's way too big. Really, you need a T3 .63 or .82 A/R depending on how fast you want it to boost.
How do you control fuel??? (Beware the FMU. Stock injectors shut off at about 70psi.) What size injectors? MAP? MAF?
I plan to run the 95 ECM with 50# injectors, LS1 MAF, Perfect Power SMT5 piggy-back to control the MAF frequency and ignition timing.
I should finish it this month (or next).
Currently I'm using a mini-AFC V2.0 and a FMU to control fueling. It seems to work very well @ WOT up to 7 psi. I do need to relocate the MAF to after the BOV. I'll do that first this winter then add some 42.5 pound injectors and a wideband O2 sensor and remove the FMU.
If the WB02(planning on using one with datalogging and gauge display i.e. PLX devices) doesn't let me tune to my liking with the mini-AFC, then I'll probably either add the Perfect Power SMT 6 (if it will work) or a Split Sec PSC1 to control fueling. For ignition timing, I'm not sure if the SMT6 will work, but I believe the MSD DIS-4 will. I want something that can retard the timing based on a MAP signal. Fully programmable ignition probably costs the same, but I don't want or need that. I've also been looking into standalones- they may be cheaper than piggybacks.
Tim1995 Z34 - T04E "60" trim, 42.5 lb/hr injectors, AEM WBO2, FFP UD&DB, 3" exhaust, 2800 stall, shift kit, tranny cooler, Powerslot, Hawk HPS, rear disc conversion, KYB, Eibach, HMS F&R STB, Fittipaldi Force 18" wheels, big stereo, lots more coming eventually...
325 whp 350 lb-ft
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