Most power from the 3.4 DOHC?

[fieromadman]

Dave,

Well Im in Boston right now. I dont know if Im going to be really tired when I get back or not. I guess it depends on the next few nights. But I guess short answer is yes, I am interested, definatly give me a ring. I just bought a Getrag for 250 dollars. if you are so fortunate you might be able to find one for a good deal like that too. I would recommend it over the 4 speed, I have driven both and I definatly like the getrag better. Anyhow, good luck with the tranny!

-Jeff

[timg]

I had the 325 whp and 350 lb-ft @ 10 psi.

It's a 100% stock motor with 161k miles on it now (and badly needs replacing)

I only have a 2.5" downpipe and the tuning has been via piggyback. @ 10 psi it is pulling a few degrees of timing with the split second piggyback. I never tuned the ignition for power, just safety. The fuel tuning is spot on and has been done with a wideband.

My 3.4 DOHC with a turbo has put down MUCH more power than any of the local heavily modded 3.8 SC's which are still running a supercharger and without nitrous. It took nitrous for any of the local 3.8 SC's to beat me.

I'm planning on a 4T65E-HD swap, 97 Z34 engine and wiring harness swap, tuning via PowerTuner, and rebuilding the manifolds and downpipe (necessary to run a 96-97 motor). I already have the motor, tranny, and PowerTuner. I just need the parts and equipment for fabricating the new manifolds and downpipe. I'll be shooting for over 400 whp (probably with a different turbo).

Tim

[Cannonball]

I told ya you should have gone for a ride in Jeffs car that night Dave. It's fast and soon to be faster but, as much as I prefer the TDC over the 3800, in your case I think you'd still be better off using the 3800 because of your trans. That 4-speed just doesn't have good gear spacing and I don't think it will work as well with the TDC as it would with the 3800. Now if you switched to the Getrag or even Isuzu, then the TDC 3.4 would be a good choice. I think, if you're really serious about the power you're talking about, you'd want to go for the Getrag for strength over the Isuzu though.
At any rate, i'm no fan of the 3800 really, Jeff'll tell ya that , but it would be a better choice for your application if you're going to keep the stock 4-speed IMHO. I know after you ride in his car, you'll be wanting one for sure but ya gotta take the whole car into consideration when making a swap choice. The TDC works so beautifully in the light Fiero with the Getrag that it's a marriage made in heaven.
BTW to give props where they're due, I had never even considered doing an engine swap until I drove Jeffs car. I had driven 3 V8 Fieros, 1 3800 SC Fiero, several 3.4 pushrod Fieros, ridden in a northstar Fiero, and ridden in a 4.9 Fiero too but none of them appealed to me like his did. It just works in many ways to compliment the car. It fits the gearing extremely well, enhances the handling because it's easy to put in the right gear to throw you through a corner and hold that gear for the whole corner because of it's canyon sized powerband, it's still in the original 60 degree V6 family which is what came in the car originally, it's a much more modern design than most of the other engine swap choices ( i think this is important considering that the Fiero, especially fastback, has a certain modern exotic look that is somewhat ruined if you open the decklid and see dinosaur technology sitting back there), it has tons of power (as you'll see soon enough and keep in mind that Jeffs car really doesn't have all that much done to it), it has such a sweet sound that none of the other swaps deliver, and, even with all that extra power, it still manages to produce excellent fuel mileage. Before the cam timing, Jeffs car was doing well over 30MPG and now still hits 30 or a little more!
Can't beat that with a stick.
Hmm, does it come across that I like this engine? I'm not sure if it shows or not.

[Mach10]

Which 4-spd? I'm running that saginaw M19 4.10 4-speed in my Fiero. Gear spacing isn't shabby (3-4 shift isn't so hot), and the tall Final really makes it haul...

[fieromadman]

we had a friend with the regualr 4 speed and the 3.4 DOHC fiero. He said that he hated the gearing on that. It revved too high on the freeway, and just didnt keep the engine i the powerband like he had hoped. His also had a problem with the synchros when he wound out the engine. I never rode in the car but that what I was told. I do know, though, that the getrag works beautifully with this engine.

[Mach10]

It does buzz on the highway, I'll give you that.

1-2 shift is perfect. Drops RIGHT into the beginning powerband. Car actually feels faster in 2nd than 1st. It's drastic enough for me to suspect that my clutch might be slipping, or else the wheels are. 2-3 is perhaps not as ideal. I'll have to play with it more after the motor's back together to decide whether to short-shift or delay.

By "regular" 4-speed, I assume you mean the muncie 4-speed from the v6s? It's a 3.63 final, which is still pretty tall. Personally, I wish only that I could have an overdrive to tame the highway revs. The rest is pretty well matched, and the M19 has a pretty good reputation for solidity, from what I'm seeing.

[Cannonball]

No Mach, this is the V6 4-speed he has. Im sure the 4.10 would work better than the V6 one with the TDC but the V6 4-speed that Fierowannabe has just has poor gear spacing.
Even the 4.10 isn't as well spaced as the getrag but certainly a better choice for the TDC than the V6 4-speed would be.
The V6 4-speed doesn't even work that well with the stock 2.8 IMHO. As Fieromadman about his dads 86 4-speed.

[fieromadman]

na-na-na-notchbox!

I dislike the 4 speed for its poor shifter arrangement and for its synchros and lack of overdrive. The 86 V6 4-speed that Dave is referring to has only 50000 original miles on it and when I slam shift into second the synchros ALWAYS grind. The car was previously owned by the original owners, my uncle and aunt and was driven in a mature manner, so its not like the tranny was beat on either.

[RacerX11]

I dislike the 4 speed for its poor shifter arrangement and for its synchros and lack of overdrive.

Guess again. The 4 speeds had overdrive, just like the 5 speeds.

[Cannonball]

I dislike the 4 speed for its poor shifter arrangement and for its synchros and lack of overdrive.

Guess again. The 4 speeds had overdrive, just like the 5 speeds.

I think he meant a higher overdrive like the Getrag. The 4-speed doesn't even feel like an overdrive. Mileage isn't to good on them either IMHO.
Definitely VERY nothcie too.
To each his own though.

[Mach10]

Heh... Well, you could say that even the 4.10 4 speed as an overdrive... Same as the muncie 4 speed. 0.81 4th ratio, which with the 3.65 or 4.10 might as well not be there at all



Now, if I could shoe-horn a 4.10 final drive into one of the 4cyl isuzu 5-speeds and give it a decent .74 5th ratio... Mmm.... toasty.

[Fierobsessed]

A getrag with a 3.94 might be pretty wicked. The 92+ 3.94's have a .72 fifth. First would be steep though, and you would need to change the bellhousing, witch isn't very hard, Re-shim the differential carrier bearings and you're good to go.

I have one of these trannies in my Quad 4 Fiero pace car, and it is absolutly wicked 1-4, but reasonable in 5th. But you need to have an engine that can really whip up a batch of RPM's quick.

[fieromadman]

All I have to say is... knock knock knocking on Impreza STi's doors....

[FieroWannaBe]

All I have to say is... knock knock knocking on Impreza STi's doors....

yes, im loving it
that was awesome on friday!

[fieromadman]

Agreed! I need to get some more done to my engine ASAP so I can beat those cars. Im really getting excited about my mods comming. I almost think that just with the newer intakes on and ported I will be able to beat that STi. That means that I should be sitting sweet when all is said and done!