i was wondering how much hp i'm going to have after the following mods on average

-3.4 pully
-down pipe
-front p log
-t stat
-colder plugs
-cold air intake
-tune
-exhaust (high flow cat)

 

Depends 100% on that tune.

280 to the crank?

 

dyno tune it and let us know! lol

it depends on way to many aspects to give you an accurate estimate.

 

i was just asking for a average figure not a 100% accurate

 

There's just no way to tell. Since you are boosted it 100% falls on the tune. Some engines can run a 3.4 pulley without KR, and some can't. The tune fixes that aspect, but will pull your HP down if you are knocking so you don't knock. I would say you can see anywhere from 260-300hp at the crank on a 3.4. That's why I averaged 280.

 

Anything below 3.5 on the pulley and you really oughta think about headers. You only mentioned a front p log so I'm assuming that means stock manifold on the other 3 cylinders. Not good. You need to have both the same and honestly for 3.4 or lower I would prefer headers over p logs. I'd be shocked if you don't have KR with this setup. How much? I can't tell you without being able to pull the data from the PCM. But KR is bad. You lose power and it's also dangerous for the engine, catastrophic if there's too much. Mismatched exhaust isn't good either. High flow cat and non-restrictive exhaust won't do you a single bit of good if you have manifolds or even p logs to an extent. Considering how much headers have come down in price I personally would not consider p logs for an L67 or L32 build. L36/26? Yeah probably because you lose too much low end grunt with an N/A setup if you use headers.

My advice? Get it dyno tuned and monitor heavily for KR. Some motors have KR bone stock and dropping pulley sizes only makes it worse. The key to keeping from blowing your motor up while modding is to do small increments at a time while monitoring KR. If you do a bunch of stuff at once and all of a sudden you have KR, it's a lot harder to determine why you now have KR.

That being said, Chibi is probably in the ballpark on crank hp.

 

SupplySGT, the Front Manifold is a restriction, the crossover is fine, and the rear manifold is actually a much better design than the front manifold. On the front the exhaust pipes are not tubular, however on the rear they are. There is not MUCH restriction in the rear. The Powerlog and Downpipe are sufficient FOR SOME members. Again it comes down to the tune.

 

lol i'm going from 240 to 260/300... wow i hope its closer to the 300

 

This is because the 3.4 pulley is going to give you more boost. Everything else is just so the engine can try to handle the boost without knocking lol.

 

I agree with Chibi 100%. You're probably looking at 220whp (280ish at the crank). But that's pretty good considering that L67's typically put down around 190-200whp. Be happy with that and when you start getting down to pulley's smaller then 3.0" you'll start looking at 300whp (380ish at the crank). We all start somewhere