Most power from the 3.4 DOHC?

[FieroWannaBe]

Well, im trying to decide which motor for my fiero, and I know the 3.4 DOHC is smoother than the 3800SC, but it doenst make as much power as easily, probally becuase of the lack of aftermarket. So I want to know how much power people have been pulling out of these motors, I have searched and I havent run across a thread like this. Start posting your numbers.

[LeftVentricle]

This thread by Tim has him running a turbo and making 325 hp at the wheels. AT THE WHEELS.

[dohcfiend]

there is 1 guy on here from time to time called kevwood. he had the heads done up and put them on a otherwise stock motor(and i mean stock as a rock) and put down 250 to the wheels n/a.

also a guy developed a set of headers for the 96-97 motors and from what i seen the gains are very not bad for a non-tuned engine. **nvm i forgot you are going fiero**

fiero's are pretty quick with a lq1 in them. general concensus says 14.1 on a stock lq1.

how fast are you looking to go anyway?

[FieroWannaBe]

Truth be told i want to hit the 12's eventually, and i know its been done with the l67's consistantly, and I think the lq1 can do it, but how easily? So I just want to see what kind of power this motor is capable of holding.

[ryan.hess]

there is 1 guy on here from time to time called kevwood. he had the heads done up and put them on a otherwise stock motor(and i mean stock as a rock) and put down 250 to the wheels n/a.

what does "heads done up" mean? Porting? Cams?

[Lyle's GTP]

600 Horse at the strip is what I was told. The guys I worked with at Optimax thought it was a monster. It only has a cast crank, but the guys I worked with that built race cars for a living said that forged cranks are over rated. Most of the guys around here would think that was crazy talk. But nobody has ever tried to push the limits. But buddy with the 325 horse unit, he built that on the bone stock bottom end and over 100000 miles on it. Crazy.

But if they can put 1000 horse through an Ecotec...

If you balanced it and beefed up your bottom end as much as you could with forged pistons and such. Then boosted it to the nuts and tuned it perfectly. I think it could be done, as long as you watched your revs at the track.

That's just me though.

Lyle

[FieroWannaBe]

Well, 600hp sounds insane, but i would have to see it to believe.

A l67 cammed, pullied and intercooled is pushing about 330hp, and 420tq acording to desktop dyno, pushing fieros into mid 12's
and a turbo lq1 is close on hp, but way under on torque, with 13's in fieros but thats on stock cams, different grinds in desktop dyno coupled with tuned headers show significant hp and torque increases. but thats all simulation nothing real world (im also guessing on many specs, because i cant locate a file for either motors) . What kind of numbers are people pulling on cammed lq1's? And what grinds are they running?

[OldSkoolGP]

How much power you want to make is directly proportional to how much money you want to throw at it. Shit, you could have a 1000 HP 3.4 if you wanted to throw $25K at it. If you're looking at it from a standpoint of value, then the 3.4 is probbaly a better motor. Why?

Anyone in the know can tell you the 60 degree V6s in stock trim are inefficient motors. What I mean is, based on the power you get out from what you put in, you don't get the best use of your air and fuel. While that may seem like a bad thing at first, it's actually a good thing, because there is a lot of room for improvement. Just making your motor operate more efficiently will get you significant power gains.

This is why I think it's pointless to modify a Honda VTEC engine. There are already extremely efficient engines, and there is little room for improvement. The only way to make real power gains with one is to turbo one or shoot a ton of NOx at them. A 3800 or 3800SC has some room for improvement in some head work and adding headers and maybe a different blower, but even with all the aftermakret suppliers for the einge out there, it's still pretty expensive. but there are a lot of cheap gains to be made in the 3.1 and the 3.4, and you can wind the piss out of them, which is my big selling point.

[MidnightriderZ24]

only 325 hp out of a boosted DOHC? 89jy is pushing 340 on his stock remote mount 3400... i plan to be 360 WHP intercooled on my 3400

[Syn]

i plan on over 300 as well with my boosted 3.1 hybrid


soemthing isn't right

[dohcfiend]

there is 1 guy on here from time to time called kevwood. he had the heads done up and put them on a otherwise stock motor(and i mean stock as a rock) and put down 250 to the wheels n/a.

what does "heads done up" mean? Porting? Cams?

they were ported and some shaping was done too i think. shit i don't remember, use the search.

fierowannabe, if you are looking for 12's and u like the lq1 only way that will happen is with boost or n20 without throwing a ton of money into it.(but it would be nice to see btw)

In design, IMO the lq1 has more potential overall.

if u have the $$$ and want to have a truly unique setup with custom goodies go lq1. if you are not too loaded and just want to run 12's and do not care how, go l67.

little more food for thought, cadi n* fieros run 12's stock. and i am sure a 300+horse sbc would probably yield good results as well. 1 last tasty morsel for you. ls1's make an assload more power when carbed. i remember looking it up be4, the gain by just going to carbed is sick.

[Mach10]

hehehehe... I love the fiero crowd!

Here's a little questionaire for you:

Try to answer as truthfully as possible, and I'll give you an honest "I've been there" opinion

1) My backyard mechanical skills can best be summed up with the following statement:
a) Oil change? Is that like spare change?
b) I can fix my own flat tires
c) I have mastered the v6 Fiero water-pump replacement
d) I can have the subframe out on my floor in less than 5 hours

2) The thought of a wiring harness stretched out on a work bench:
a) Makes me sick to my stomach
b) Makes me feel slightly dizzy
c) Where the hell did I put that shop manual
d) Makes me SO horny.

3) I have driven a stock 2.8 Fiero and
a) Am scared to turn corners
b) I can drive it normally
c) I can keep the car mostly in line under most conditions
d) I can keep the tail steady on a flat 4-wheel slide in the snow.

4) Based on what I know of the Fiero's handling and performance characteristics,
a) More low-end grunt is what I crave
b) More top-end power will make it more enjoyable
c) A flat torque-curve gives me piss-shivers
d) Nothing short of a fire-breathing ground-pounding monster will keep me hard.

5) I like driving my fiero
a) Once a month
b) Once a week
c) Every couple of days
d) Daily driver... Booya!

6) One word/phrase that bests describes my automotive budget
a) 99c bin @ local car-wash
b) Salvation Army Re-Store.
c) I live at home, have job, pay no bills.
d) Drug Dealer.

[ryan.hess]

1) My backyard mechanical skills can best be summed up with the following statement:
d) I can have the subframe out on my floor in less than 5 hours
3 hours.

2) The thought of a wiring harness stretched out on a work bench:
d) Makes me SO horny.

3) I have driven a stock 2.8 Fiero and
c) I can keep the car mostly in line under most conditions

4) Based on what I know of the Fiero's handling and performance characteristics,
b) More top-end power will make it more enjoyable
c) A flat torque-curve gives me piss-shivers

I have no idea what piss-shivers are... but either/or works for me

5) I like driving my fiero
c) Every couple of days
d) Daily driver... Booya!
It was my daily driver until I took it apart again........

6) One word/phrase that bests describes my automotive budget
b) Salvation Army Re-Store.

So tell me Doc... what do I have? It's bad isn't it.... :P

[series8217]

Matt Hawkins ran a 12.7 on I think 12psi. His motor is a stock internals 3.4 DOHC in a Fiero. He has a custom sheet metal intake and custom exhaust manifolds; though I dont think they are equal length headers.
He put down almost 300 HP at the wheels through a Getrag 5-speed running 9 psi. I imagine he is around 325 or so with the 12 psi. It doesn't take much to put a Fiero into the 12's in the 1/4 mile! It DOES take much to make transmissions last while doing so.

Here's one of Matt's threads. Note the dyno graph is a 2.8 turbo not the 3.4 DOHC. I don't think he posted the graph for his motor, just the numbers.

http://www.fiero.nl/forum/Archives/Archive-000001/HTML/20040223-2-037868.html

Not sure where the thread is that he lists he 1/4mile times, but I think its on the big Fiero 1/4mile list.

[Husky]

only 325 hp out of a boosted DOHC? 89jy is pushing 340 on his stock remote mount 3400... i plan to be 360 WHP intercooled on my 3400

He's running 10 pounds of boost, totally 100% stock motor other than the turbo equiptment, and he's not tuned AT ALL for boost. He's waaiting until he goes OBD-II to tune. Who knows what kind of power the motor will push with whatever he tops out for boost, once he tunes? I personally can't wait to see it.