Ok guys today wasn't great. My car is a LNF cobalt with the zzp s252 turbo kit, spec stage 3+ clutch and a forged motor. everything else was stock.
boost pressure was @ 20 psi.
IAT was 99-100 degrees
coolent temp was 199 degrees
ambient air temp was 86 degrees
alttitude is +6 feet above sea level
Redline was 7000 rpm
AFR was 12.4
Timing was 13 degrees advance
no kr

Unfortunetly guys after 4 hours of tuning on the dyno all we could get out of this thing was 340 whp and 290 wtq. I figured for 20 psi it might put down more power. I'm hoping either the motor has to break in more because it has 500 miles on it now or that the stock charge pipes and catback are causing a major restriction but I dont know if this thing has another 100 whp left in it even with another 7 psi. the stock intercooler seems to be pretty good since its performing at 15 degrees above ambient.

The good news is that the power curve looks great. it spools early and torque peaks around 3400 rpm and plateau's across the whole powerband. Hp climbs slowly and holds to redline my power peaked around 6760 rpm.

And to make matters worse before we were done tuning my brand new engine dumped oil all over the dyno. I think the front main seal I got from GM was defective but this was beyond frustrating and this puts my cobalt off of the speed channel if its not back together by sunday.

 

post up a picture of the graph if you can.

 

I will next time im over there after it started dumping oil I didnt bother with pics

 

sounds like story of my life lol, hope it all resolves itself man, i know the feeling of building a car and having everything go wrong

 

that doesnt sound right... i would def go back to the drawing board on that one... or to a different dyno

 

its not the dyno. its the same dyno I go for my corvette. its a known low reading dyno but I expected alot more it went from 285 whp/330 wtq at 27 psi on stock turbo to 340 whp/290 wtq at 20 psi on S252 turbo on the same dyno

 

20psi is a bit low for that kit, no?

 

do a compression test asap... sounds like your not using all four cylinders

 

its probably because the motor isnt broken in and i dont think its wise to be pushing it that hard without breaking it in first.

 

I just rebuilt the motor 500 miles ago im trying to take it easy

I did when they rebuilt the motor

 

thats why I didnt push the turbo all the way to 27+

 

more timing?

 

I added more but then the oil came out so I didnt get to see the results

 

do it again... who ever built your motor didn't do something right.. otherwise it wouldnt have pissed out oil on the dyno... so check it again

 

ok im going to check it again

 

i wonder what it would have done, 13 degrees isnt much at all

 

thats not the problem

YouTube - Super Speeders Supra does 213 mph in Standing Mile

nuff said

 

i wasnt getting to crazy with it until I get over 3k miles. i upped it to 14. there was no kr anywhere in the tune

 

the current plan is to get this thing fixed and dyno it again for the speed channel interview on sunday. then i'm going to give it some more miles and remove any restrictions in the intake and exhaust. and retune for 27 psi in the next few months. ill keep you guys informed thanks for the help

 

Really, the engine pissing oil has nothing to do with a blown motor, unless you see that it sent a rod or chunk of piston through the block or oil pan. It would be painfully obvious. Depending on how long the motor ran without oil, might wanna rebuild her again.

Suck to hear man.

 

no it doesnt... but unless something was overlooked, a front mainseal on a brand new motor shouldn't leak at all. logic would say something else was probably overlooked too.

 

Can you post a log? Were you commanding 12.4 AFR and actually reading 12.4? The MAF needs to be adjusted quite a bit with the big turbo and the higher fuel pressure. If you didn't get a tune with higher fuel pressure, you should get on that

 

IMO, 13 peak timing is ok to start with, especially given that you'll be pushing a lot more air. 20 psi is low for that turbo though. Look up the compressor map for that turbo. I'd ask ZZP for tuning tips.

As for the oil puking, well, I doubt that the seal itself was bad...

 

we were commanding .84 we were seeing .83 lambda on the data log. dyno read 12.4 afr. im using hpt so I can't command fuel pressure yet. I'll get a log next time im at the shop.

luckily we shut it down after a couple seconds and it only lost a little less than a quart before we shut it down.

 

i would believe a big problem is your intercooler and exhaust. even tho the ic cools ok it is a volumn restricter, and you really need a bigger exhaust to help the turbo flow better.