Official GMPP Stage 3 Dyno Session

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01-20-2011, 12:19 AM

#76

RoelSS

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Quote:

Originally Posted by ULWiz Cobalt SS/SC

On 42', CAI,DP,2.9 GM3+Trifecta+BYT Tuned i did 13.4@104.1 on my good old street tires.

Recently went 60's, 2.8, BadMab, GM3 BYT Retuned. Hoping for high 12 to extremely low 13's.

Keep us posted what you run.

We got similar trap speeds. I didn't get a 60' as good as yours. I got 2.28, hence the 14.0 run. I made this with the mods in my sig which are very minimal. I recently installed a zzp s2 HE to help keep iat's at par. I'm sure the ET's will come down providing my 60' goes down and with the help of the baby bottle

I'll keep the thread posted once I hit the track. Just gotta get a few more things (slicks and a DP) then I'll hit the track.

Make sure you keep us posted with your results as well! Good luck man

BTW are you running the stock exhaust on that shorty/catless setup?

Last edited by RoelSS; 01-20-2011 at 12:40 AM.

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01-24-2011, 05:51 PM

#77

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Quote:

Originally Posted by RoelSS

Ok, all went well at Haddad earlier today. I'll add the link from youtube to this post on Monday. I'll also add the Dyno Chart printout I have. Well, Here are the numbers:

On Stage 3 + 100 octane mode + 50 Shot:
Max HP: 274.8 @ 6864 rpm
Max Tq: 306.8 @ 4469 rpm
AFR: 12.459:1

On Stage 2 only:
Max HP: 217.9 @ 7000 rpm
Max Tq: 181.6 @ 5481 rpm
AFR: 11.227:1

Here is the link for the Video:
YouTube - GMPP Stage 3 Cobalt on the Dyno

Were these read using a tail pipe sniffer?
dyno I use reads in the 13s when my wideband reads 11.5...
roel are you stating your afrs based off a wideband reading from the collector, or a nearly always inaccurate tailpipe reading?

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01-24-2011, 06:57 PM

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RoelSS

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I really cant recall, it was a while back ago. I think it was a tailpipe sniffer as you state. I just went in there and asked Mike Haddad for 3 runs. This is what I got. I have the print out, but I'm not sure if it states on their how the AFR was read. I'll look when I get home.

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01-24-2011, 11:52 PM

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RoelSS

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I checked the dyno print out and it doesn't mention anything on how the AFR was read.

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01-25-2011, 01:36 AM

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most likely at the tail... unless you have a spare bung in your collector or pre cat in the dp... the afrs were read @ the muffler.

willing to bet your afr on a dry 50 shot is low 11s

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