ZZP LNF Turbo Upgrade- First Dyno Session

Matt M · 10-18-2009, 01:06 AM

As many of you know, we have been using my '08 Cobalt SS/T to test a variety of new ZZP mods. We were able to push the stock turbo to 340whp(sae) and an 11.99 ET. We recently started releasing many of the parts I ran on this car. The next step was to work on a turbo swap in search of big power...

Ryan has been working hard on a bunch of new parts for the new ZZP LNF turbo upgrade. We just fired up my car with the first kit installed.

Here is the mod list:
ZZP LNF turbo kit with Borg Warner S256 extended tip turbo from Bullseye Power
External wastegate dump tube
ZZP upper charge tube
ZZP race intercooler
ZZP ported head with 78 lb valvesprings
ZZP fuel pressure modifier @ 2750psi
ZZP 3" stainless catback
ZZP stage 4 clutch

We fired up the car this afternoon and strapped it down on the dyno. I set up a file for the base tune and we made the first pull at 18psi. It was a short pull, shutting down at 6400 RPM and we were quite pleased with the results. Actual power was over 410whp, and the sae corrected power was 392(yeah, it's cold here) and climbing rapidly. A couple pulls later we were over 410 corrected at 18psi. Unfortunately, when we turned it up, we started running into a bunch of ECM issues and had to work around them. It seems that the ECM likes to close the throttle and spoil all the fun.

We ran into this before and fixed it by limiting the pressure the MAP sensors could see. This time around, it seems that once we are flowing enough air, it doesn't matter what the boost level is- the ECM still get's angry and closes the throttle. After working on the solutions for a couple hours, I was finally able to make full pulls at over 20psi, putting down over 440whp. For the last pull, I added 2 gallons of 110 octane with approximately 4 gallons of 93 left in the tank, set the boost to 22psi and revved out to 7800 RPM. The pull was clean until 7500 RPM, when the throttle started to close and power fell off. Max power for this pull was 465 sae(491 uncorrected)whp! The dyno chart is not pretty, but the power this car is putting down through the full exhaust and after only a few dyno pulls is very promising.

Here is the dyno chart-

Boost is scaled at 1psi/10whp on the dyno chart. In other words, the 200whp line is the 20psi line.

I am going to try to get back over to the shop tomorrow and see if we can get this machine past 500whp. I'll let everyone know how it goes.

thc · 10-18-2009, 01:09 AM

right on. good luck

Maxim_X · 10-18-2009, 01:10 AM

Impressive numbers!

Kildore · 10-18-2009, 01:12 AM

WoW!! Looks like the aftermarket war is on. Top contenders ZZP and Hauhn. Awsome stuff. Will be exciting to see what the LNF potential is really going to be!!

Sevensix9 · 10-18-2009, 01:13 AM

Dude, I want that setup

-alex

austinss · 10-18-2009, 01:13 AM

This is awesome, can't wait for the results

Kildore · 10-18-2009, 01:13 AM

What is the running total for aftermarket parts, laybor, tuning and such?? Any broken parts thus far?

pookie025 · 10-18-2009, 01:15 AM

Finalllyyyy!!!!!!!!!!!!!!!!!!!!!!!!! yes!!!!!!!!!!!!!! omg how much$$$$!!!!

Gimpster · 10-18-2009, 01:15 AM

How much of the power do you think the cylinder head is bringing to the table?

damien · 10-18-2009, 01:28 AM

Good work.

I take it 78lbers are required for the LNF to rev that much higher over the stock limit? It looks like without them you'd get roughly a 2k RPM powerband.