347 Stroker Questions

Pittmac816 · May 16, 2011

I have a 95 GT with a 347 stroker with Roush Sr. heads, performer II intake and forged bottom end. I am looking at putting a supercharger or a single turbo setup on the car. It is running 9.5:1 compression and my question is how much boost could be ran if it is tuned correctly? Also how much power am I looking at getting with either a turbo or supercharger? I am new to the power adders and I am not sure what one to get. Any help would be great!!

BlackVert · May 16, 2011

welcome to the board!

these blocks can handle up to about 500 horses or so before you start worrying about breaking them.

as you probably know, boost is actually only a measure of back pressure. more boost doesn't necessarily mean more power, it means more air backed up trying to get forced through. the better an engine flows N/A, the more air it will flow with forced induction, and the more power it will make with a blower, even with low boost numbers.

if the motor makes 350 horses naturally aspirated, then you can make 500 horses with about 6# of boost. usually, 14# of boost doubles the power output.

what is your goal/purpose for the car?

revhead347 · May 17, 2011

The compression ratio is a little high, but not high enough to seriously offset the decision to use forced induction. A good intercooler will be the best way to combat the higher compression ratio of the engine.

Kurt

Joe 5.0 · May 17, 2011

6-8 psi out of a turbo or supercharger will prob put you around 500rwhp, more if you decide to go the meth injection route.

I would seriously consider staying NA and trying to wring some more power out that way, because your block will become a consideration with even mild amount of boost.

Also, what kind of power does it make right now?

Pittmac816 · May 17, 2011

It pushes out 375 to the wheels now but I am wanting around 500rwhp. I do not know any other way to get that kind of power on NA without going to a bigger motor. The motor only has 600 miles on it right now so I do not want to start over. I want to use it as a weekend driver and a track car. I have other cars to drive daily so I am not worried about that. What is a good block that would hold a lot of power?

1slow95 · May 17, 2011

Dart block will take anything you throw at it.

Making 375rwhp NA and 9.5:1 compression it won't take much to get to 500rwhp. Probably 5-6# with a turbo or 6-8# with a S-Trim should get you there with pump gas. With your compression I wouldn't go much over that without running meth or 100+ octane.

Pittmac816 · May 17, 2011

What is the benefit of running meth injection? I have heard of it but I am not familiar with why people run it. Sorry I'm new to this forced induction stuff lol. How large of a mass air and throttle body should be put on if I were to boost it? Also how large of a turbo should I put on the car? 70mm?

bayellowstang · May 18, 2011

70mm will probably be too small or run out of steam up top. I'm looking at a 76mm for on mine. We are in about the same boat mine is just over 9.75:1.
Meth injection cools the air charge temp so you are less likely to detonate with the high compression and boost. I will be running intercooled and meth injection unless I switch to E85 if we ever get it around here.

347 Stroker Questions

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