Originally Posted by blackvette101

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.

Originally Posted by Terminator2

What did the car make stock on that dyno? Your tune definately needs a lot of help based on those timing and A/F numbers alone. Too rich and not enough timing.

Originally Posted by BYT*SS*TURBO

You need to raise the fuel pressure, number 1. I suggest you employ a local TF dealer to come flash it with a layered file from Vince.

Originally Posted by blackvette101

timing I didnt get a chance to add before my oil went everywhere. what would you recomend for afr and timing

Originally Posted by Terminator2

A/F should be 12.8-13.0 range timing should be about 21* max 10-14* in the midrange on 20 psi. Higher boost levels (27 psi) same A/F, 15-16* timing max and 6-10* in the midrange should be fine with no knock. You should get a larger more efficient IC like modern performances or ZZPs.

Originally Posted by BYT*SS*TURBO

The car is a lil rich still but for the bigger turbo it's not TOO bad. I would lean out just a tad once you get the fuel pressure correct. Bump up the boost to 24-25psi and work the timing from there on the DYNO. I stress on the dyno because it's easy to get past the peak timing point and not knock

Originally Posted by BYT*SS*TURBO

The car is a lil rich still but for the bigger turbo it's not TOO bad. I would lean out just a tad once you get the fuel pressure correct. Bump up the boost to 24-25psi and work the timing from there on the DYNO. I stress on the dyno because it's easy to get past the peak timing point and not knock

Originally Posted by blackvette101

yeah I'm going to get the intercooler and charge pipes when I take the turbo to higher boost levels when the motor gget some more miles on it. and im goin gto try those timing settings



yeah I always tune on the dyno. but im not sure if I should take the boost that high on a motor with only 500 miles

Originally Posted by BYT*SS*TURBO

When working with a much bigger turbo and higher power levels you can easily pass the peak timing/power. Ive seen it happen many times

Originally Posted by cubaniche

Stupid question. You sure its a load bearing dyno? I know that a non load bearing dyno or a dyno that doesnt have the air brake kit installed, to simulate the road, doesnt load up the the engine enough to spool the turbo properly and it causes weird numbers like that. Your vette dynos on that dyno fine cause its not boosted. You sure that dyno has done boosted cars before?
I know its a really dumb question, but it happened to me on a dynojet that wasnt equipped with the air brake kit so it wasnt loading the engine enough to spool the turbo properly. I was getting 270whp on a 24psi Trifecta tune, when, on another dyno, I put down 290 on an old 21psi hp tune.
Just saying man, it doesnt help that you blew a seal and spilled oil everywhere either, so that could be pointing towards some other unknown failure.

Originally Posted by cubaniche

Ah okay. Just checking. Sometimes the littlest things can be overlooked. Hope you get her running like she should with that kit man
And I mispoke about your vette not being boosted lol Sorry.

Originally Posted by cubaniche

BTW, I may have missed the post, but was it the main seal thats leaking?

Originally Posted by Wickedlsj

I'm assuming you have the stage sensors?
Since you don't have any of the Trifecta fixes you probably ran into issues with the throttle not staying wide open and fuel pressure, as mentioned.
Don't worry though, you're numbers are very similar to mine with pretty much identical a:f and timing.

BYT, have you gotten very far on cmiller's car?

Originally Posted by Wickedlsj

I'm assuming you have the stage sensors?
Since you don't have any of the Trifecta fixes you probably ran into issues with the throttle not staying wide open and fuel pressure, as mentioned.
Don't worry though, your numbers are very similar to mine with pretty much identical a:f and timing.

BYT, have you gotten very far on cmiller's car?

Originally Posted by blackvette101

actually I don't have any new sensors and di you have the same setup as mine?

Originally Posted by BYT*SS*TURBO

Finally today we are making some break thru's. We had a base file for the wrong MAP sensors at first that was killing us. Vince was willing to give us ZZP's file (and ZZP also didn't seem to mind TOO much) but we kept working our own and it's finally acting properly. Getting the boost curve right with this setup is quite the task right now lol. I give them a LOT of credit for doing the first one and figuring it all out.

Originally Posted by Wickedlsj

I have the ZZP 252 kit so it should be very similar to yours, differences are:
GM Stage 1 sensors
Upgraded intercooler and aluminum charge pipes
Trifecta throttle control and increased fuel pressure.

Originally Posted by Wickedlsj

I'm assuming you have the stage sensors?
Since you don't have any of the Trifecta fixes you probably ran into issues with the throttle not staying wide open and fuel pressure, as mentioned.
Don't worry though, your numbers are very similar to mine with pretty much identical a:f and timing.

BYT, have you gotten very far on cmiller's car?

Originally Posted by blackvette101

so apparently my car hasen't leaked any oil after last night. It puked up abloust 2/3 of a quart on the dyno during a power pull. And that had stayed dripping but once it was all dry the engine didnt leak anymore and it has held the 4+ quarts left. any ideas?



nice what power did you end up making



data log says the throttle was open 83% does the trifecta fixes change that and was that what you got

Originally Posted by Wickedlsj

I have the ZZP 252 kit so it should be very similar to yours, differences are:
GM Stage 1 sensors
Upgraded intercooler and aluminum charge pipes
Trifecta throttle control and increased fuel pressure




Yeah, it's tricky! In the little bit we have messed with it, just turning up the boost hasn't done a whole lot, I'm going to spend a whole lot of time on it next week.

Originally Posted by BYT*SS*TURBO

Finally today we are making some break thru's. We had a base file for the wrong MAP sensors at first that was killing us. Vince was willing to give us ZZP's file (and ZZP also didn't seem to mind TOO much) but we kept working our own and it's finally acting properly. Getting the boost curve right with this setup is quite the task right now lol. I give them a LOT of credit for doing the first one and figuring it all out.