What runs a 3" pulley, but only makes 200ish WHP...

...my car!

my question is why? It should be closer to 230WHP, like all the other stageII cobalts out there...or even more.

Im sure you guys have a better flowing head, which would limit my HP a bit, but i also have 0.2L more displacement than you guys, and on a 10:1 CR, and ive got a full exhaust, running stock LSJ intake...so why am I making less HP than a stock SS when if anything i should be making more? is the LS head really just that restrictive?

just a little info, im running the 3" pulley, 42lb injectors, mods in sig, usually an AFR in the high 11's, sometimes low 11's sometimes low 12's (never higher than 12.2) depnding on weather, and while i dont know my max timing off the top of my head, i can check if you guys would like...but im pretty sure my tune is solid. its an instant 9psi always (sometimes instant 10psi) and it slowly creeps up to 11psi to 11.5psi, so i dont think its belt slip or anything either....

 

idk. i'm not a huge tech guy, but i'm under the impression that you cant have a different engine, and expect to have the same output as a 2.0, just because you have similar mods. Also keep in mind we are boosting at least 15 psi with a stg. 2. Maybe the diameter on your exhaust is too wide, losing too much back pressure, or try getting an intake to get more condensed/cooler air into your blower...

Idk like i said i'm not a tech - good luck tho

 

im boosting less psi because my increased displacement reduces the amount of resistance

 

your mods list says you have 250 bhp why only 200 now. did you change anything

 

Probably all in the tune. Not much help I know, but thats probably what it is.

bhp and whp are two different things.


BTW Hunter, what is your torque? And are you on stock cams? That could be part of it as well.

Oh, and the fact that you have an Auto.

 

what kind of dyno first of all? second, your engine is different, there may be alot of things that set it apart form the 2.0. I don't know all that much about the 2.2, but is the crank pulley the same size? If not, you're gonna be spinning the blower at a different speed with the same size blower pulley.

 

a 55hp gain really isnt that bad the ss/sc was made for boost 2.2-2.4s are not, are engines are made to flow better and ur not running a lot of boost. remember its not a turbo ur using power to make power now

 

otter-matic?

 

im pretty positive all crank pulleys amongst ecotecs are the same size, though ill go verify this with MRZ. im running stock cams...the same cams as the LSJ only the timing is at different specifications (basically i need adjustable cam gears). It hasnt been dynoed yet, but i was assuming about 18-20% drivetrain loss. The automatic shouldnt affect crank hp, which should still be closer to 300 than 250. Thanks for the ideas though.

its about 250bhp, 200whp, though the whp is an estimation, and i have no idea what tq i have....sure feels like a good improvement whatever it is though

 

Don't assume you're only at 200whp if you haven't dynoed yet.

The reason I asked about the cams is because the 2.0 setup makes power higher in the band than the 2.2 does. I'm not sure how the upper rpms on the 2.2 respond to boost though.

 

regardless, i should be sitting at atleast 230-240whp...not 200ish

im basically a stgII SS/SC thats been stroked and has higher comp pistons and a slightly less flowing head

any other ideas?

 

are you getting alot of knock with the 10:1 CR?

 

how are you monitoring knock hunter? Do you have a dashawk or interceptor to tell you if your seeing any? You should get one so you can run as much timing as possible. Your probably losing a lot of power because of the tune overall. I know its gonna be hard to do with a AEM FIC and a partial tune but just keep working on it.

 

did i read that right? You THINK your only making 200whp and your dissapointed even though you haven't dynoed yet? This makes ZERO sense to me........

 

i have 224 hp and all i was running at the time was a CAI

 

...im confused how this doesnt make sense to you. Its a fairly accurate estimation...im not just saying "this feels like 200whp". And with my mods, it should be closer to 240whp

im running dual interceptors and have yet to show more than 2* knock, and that was just a blip of the throttle. never had any knock on a WOT run

 

Hmmm...if you haven't dynoed it I'm going to say it's probably your "solid" tune. Flash on the stage 2 canned tune and see how it runs...no wait...that won't work because you have increased displacement.

I don't recall what the stock compression ratio is for the 2.2 and I don't know what you increased it to (10:1?) but that can be a problem with higher boost. What do you mean by "stroked"; do you mean just the pistons or did you change the sleeve bore?

He's saying that just because you say it doesn't "feel" like 200 hp doesn't mean it might be making that. Interceptors aren't accurate until you adjust them with horsepower. Also, because you are auto there may be some sort of torque reduction/protection occuring at the tranny.

 

i dont how your complaining about the lack of horsepower it makes yet it hasnt even been on a dyno yet. Go dyno it, then come back and complain about the horsepower, you dont even know what the hell your car makes until you dyno it.

 

.....LSJ = 86mmbore X 86mm stroke with 9.5:1 CR
L61 = 86mm bore X 94.6mm stroke with 10.0:1 CR

im saying the L61 is effectvely a stroked LSJ with a higher CR and a more restrictive head

I cant flash on a stgII tune because i dont have an LSJ...

you DO know i have a LS right?

anyway i know AFRs are correct. Someone wanna tell me what their timing is at say...6,000RPM on a stgII cobalt...or any 3" pullied cobalt? ill go comapre it to my timing