I picked up the 3.4 today and started the tear down. It has alot of carbon buildup inside.

Any ideas you guys have to gets more Horse Power out of this thing lets hear them.

Earl

How's about a picture of the intake ports on the heads? I would like to see if they look like the stock 2.8 heads.

avengador1,

To me it looked like the Stock plenum would match very close. Without actually sitting one on its hard to tell.

Back to work,

Earl

[This message has been edited by FieroGT87 (edited 08-11-2002).]

Here's some pictures of my new engine. Sorry to highjack your thread. You can see some of the modifications done to mine in these pictures. These could help yours also. I had the heads pocket ported, I also have full roller rockers now. The engine was bored and stroked to 3.4 from 2.8 and Im using a Crane Compucam 2030. Im interested in a picture of the heads intake side, like my second picture, Thank you. and

[This message has been edited by avengador1 (edited 08-11-2002).]

Yes the 3.4 heads match up to the 2.8l intake. They are the same heads.
As for more power,
Change cam,
rework heads,
don't use Fiero intake system,
headers
double roller timing chain
roller rockers
performance ignition
You can get about 210hp with a mild build and about 265hp with a wild build normally aspirated.
Then there's turbo's, superchargers, and nos for more.
The aftermarket isn't huge but it's there.
Depending on who or what I give my specs to, mine will run 210-235hp. I'm guessing the 210hp is the realistic number, but once the motor is built, installed, and running, I'm going to dyno it and see what source was the most accurate.

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Happiness isn't around the corner...
Happiness IS the corner.

avengador,

Heres a pic on intake side of the heads. Don't worry about highjacking the thread. The more info here on 3.4's the better.

I hoping to get around 215-230 normal aspiration.

[This message has been edited by FieroGT87 (edited 08-11-2002).]

I found a formula from the Accel site to determine what size injectors to use. The 19# injectors are good for 215 HP using the formula. Here it is: (HP x BSFC)/(#cyl x Duty Cycle). The results of the formula are the pounds per hour size injector. HP= Horsepower, BSFC= Brake specific fuel consumption, for low compression the number is .5 to .6, for high compression the number is .45 to .35 (use .45 for average engine). Duty cycle is the percentage of time the fuel injector will be on (.8 to .85 is safe number)

[This message has been edited by avengador1 (edited 08-11-2002).]

quote Originally posted by avengador1: I found a formula from the Accel site to determine what size injectors to use. The 19# injectors are good for 215 HP using the formula. Here it is: (HP x BSFC)/(#cyl x Duty Cycle). The results of the formula are the pounds per hour size injector. HP= Horsepower, BSFC= Brake specific fuel consumption, for low compression the number is .5 to .6, for high compression the number is .45 to .35 (use .45 for average engine). Duty cycle is the percentage of time the fuel injector will be on (.8 to .85 is safe number) [This message has been edited by avengador1 (edited 08-11-2002).]

You calculations are correct but the assuption of an average BSFC number can throw the results off. The BSFC actually varies greatly from engine to engine. If you use 19 lb/hr. fuel injectors the theoretical HP figure that these can support is 215 HP as you show above. The Ford Mustang 5.0L V8 used 19 lb/hr fuel injectors and modifed engines of this type made over 250 HP with these injectors.
For short periods of time like 10 to 20 second (such as in the 1/4 mile) you can run your injectors at 100% duty cycle with no ill effects. For criusing and daily driving the duty cycle which you show is recommended.

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87GT 3.4 Turbo Best 0-60 5.2 seconds
http://turbofiero.fierojoe.com/turbo.htm

Hey Earl.... I'm going to see if I still have that 3.4 intake. I don't think that I kept it...but I'll keep an eye open for it. Reversing that one may be a possiblity.