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Horsepower estimate

SgtMarshal

SgtMarshal

Active member
I just ordered the rest of modifications that im going to do to my grand prix. so far ive done a wizaired cai, a ported tb and spacer, ive done ported exhaust manifolds, ported crossover pipe 2.5" downpipe no converter and a 2.5" cat back. and im currently running a 3.4" pulley. I have no KR.

I am going to do the gen 5 swap and 1.9 rockers and I will probably do either a 3.5 or 3.6 pulley depending on kr.

I'm just curious how much horsepower I can expect after I do the gen 5 and rockers.
 




It goes into the exhaust just like an o2 sensor and tells you what your air fuel ratio is. It's great so you don't run to lean or to rich.
 
johntremell said:
I just ordered the rest of modifications that im going to do to my grand prix. so far ive done a wizaired cai, a ported tb and spacer, ive done ported exhaust manifolds, ported crossover pipe 2.5" downpipe no converter and a 2.5" cat back. and im currently running a 3.4" pulley. I have no KR.

I am going to do the gen 5 swap and 1.9 rockers and I will probably do either a 3.5 or 3.6 pulley depending on kr.

I'm just curious how much horsepower I can expect after I do the gen 5 and rockers.
Click to expand...

210-215whp corrected.
 
If you don't wanna get down and dirty with a cam, I would port the Gen III, 1.84 rockers unless you are doing springs etc.. and some headers.
How fast you looking to go?
 
Check out our updated virtual dyno app, here is a short link ...

http://horsepowercalculators.net/vdyno

You can model these changes and other mods with it. We also allow you to model your altitude vs a stock or baseline run. I'm afraid you're going to be surprised with how much power you're losing to altitude ... I had a customer building for a '300hp' twincharged setup on a mini cooper and when we adjusted for his altitude it ended up being about a 225hp build even though it was advertised and dyno proven at sea level as a 300+hp setup.

We don't model head porting and surface finishing obviously but pretty much everything else you can test on our dyno.
 


Probably about 240~ish.

GenV, rockers, PEM's/DP...which need to be tossed for headers ASAP...then I'd say a solid 240WHP on a 3.6"...should be easy.

Then again, throw out that TB spacer, it's junk. And why do you have a ported TB? No real need for it...are you tuned now then I assume?
 
blueguy91 said:
Probably about 240~ish.

GenV, rockers, PEM's/DP...which need to be tossed for headers ASAP...then I'd say a solid 240WHP on a 3.6"...should be easy.

Then again, throw out that TB spacer, it's junk. And why do you have a ported TB? No real need for it...are you tuned now then I assume?
Click to expand...

Not at his altitude (7,000ft). Which is also why he's not seeing knock now.

Expect dyno read of 205-215whp at max depending on the tune on a 1.9rr, Headers, GenV 3.5 up there.
 
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