Anyone hear of the 3.4dohc having 275hp originally?

[Schurkey]

GM went racing with the "Quad 4" engine. Well, they called it that, anyway. And it had LOTS of power. Why doesn't anyone remember that NOTHING on it was stock production. The only thing the race engine had in common with the production engine was the bore center measurement. Not even the block was the same.

275 horses out of the 3.4? Sure. I have no problem believing it could be done.

Can it be done and still meet all emissions requirements AND the car still makes it through the warranty period? Nope, I'm not buying that. Not with the technology GM was willing to utilize in in '88--'96. (It's not that the technology didn't exist--it's that GM pinches the nickel until the buffalo poops.)

And I don't care who heard what story from someone else. I can claim that my brother's girlfriend's aunt had a dog that used to belong to a dyno operator that once saw a GM 3.4 DOHC make 800 horsepower. There's no credibility, 'cause stories get exaggerated with each re-telling.

I wanna hear it from the GM Powertrain development team member.

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[hok666]

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[mrslick800]

Well I guess that answers a question I posted in the performance forum before i saw this...
another little side note on the fiero concept car discussed bfore, if anyone is interestedin seeing something kind of cool check out the Sheetmetal Handbook by Ron Fournier, he made the custom intake for that motor and it shows step by step how he did it.

[series8217]

another little side note on the fiero concept car discussed bfore, if anyone is interestedin seeing something kind of cool check out the Sheetmetal Handbook by Ron Fournier, he made the custom intake for that motor and it shows step by step how he did it.

What custom intake? The 89/90 concept had a cast aluminum plenum just like our motors...
Do you have the book? It'd be cool if you could post scans or pics!

[mrslick800]

What custom intake? The 89/90 concept had a cast aluminum plenum just like our motors...
Do you have the book? It'd be cool if you could post scans or pics!

It was a cast or machined (I cant tell) base with sheetmetal runners, it said he needed to make abunch but they may have just been for the developement engines, I'll post the pictures if I can get my scanner to work.

[4camv6]

I saw something written on the internet about the 3.4dohc having 275 hp when it was first designed but was taken to 200hp by cutting the fuel delivery and spark advance curves because of tranmission warranty problems does anyone know if this was true?

yes it is true, just removing the EGR connector and deleting the cat really wakes up the '95 and up 3.4- so much so, that it will break the trans after a while, and even sooner if you drive it hard

the 3.4 was under-trannied from day 1

[SappySE107]

yes it is true, just removing the EGR connector and deleting the cat really wakes up the '95 and up 3.4- so much so, that it will break the trans after a while, and even sooner if you drive it hard

And on this note, the thread is closed. Remember folks, if you let the engine make 3 more hp than stock, your trans will blow up.