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Old 05-04-2022, 06:58 AM   #15
WVracer
 
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Drives: '11 2SS/RS LS3 M6 (Sold)
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Something definitely seems off. Log the car at the track one day and send it to PCM of NC and have them look it over. They have been doing my email tuning since January and we are still getting it dialed in. Also go through the car and check everything over: rockers, valvesprings, spark plugs, plug wires, etc. Another possible issue is heat soak of the MAF which also measures our IAT. My IATs will get up to 150F at idle which pulls a good bit of timing. Once the car starts pulling fresh air the temperature goes back down to about 8F above ambient but it takes a few seconds. A few seconds of high IAT, and low timing is enough to make the car slow in the 1/4
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2011 IOM 2SS/RS LS3 M6- Injen CAI, TSP 1 7/8” headers, PTB, Hurst short throw, Corsa catback exhaust, 20" TSW Nurburgrings, BMR lower control arms, BMR tunnel brace, Hotchkis lowering springs. 3660lbs. Tuned by me (sold)

2010 RJT 1SS/RS LS3 M6- CAI, TSP 2” headers, TSP F-35 cam, PTB, Hurst short throw, Dronemaster catback, BMR lowering springs, Kirkey seats, 20”/18” Weld Belmonts, 3550lbs.
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Old 05-04-2022, 10:42 AM   #16
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DA was 2458' that day, so there's definitely a tenth or two in better weather. I'm running 3.91 gears, 315/30/20 Nitto 555 R2s. My limiter is set at 7100 RPM. I also have a Rotofab CAI , so I don't think heat soak is an issue, and I typically have my hood open and the car shut off in the lanes. I'm also planning on having my car dynoed with HP tuners logs to send to PCM of NC as soon as my new diff is in the car, hopefully it will provide some insight.
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Old 05-16-2022, 06:19 AM   #17
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Took my car to the track Friday, on the first pass I tried to feather the clutch out of the hole and just smoked it. It slipped badly when I shifted, so I got out of it and coasted through. Waited 3 hours to let it cool, made another pass and ran a 12.52@111 with a 1.78 60'. My clutch is definitely toast, even on that pass I could smell it after I hit the return road.
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Old 06-15-2022, 05:06 PM   #18
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Originally Posted by acammer View Post
So, we're missing some key information to really understand your ETs - what is the density altitude? A 12.6 at 8,000' of DA might not be that bad, at sea level it would be very suspicious. Post up your best slip, and lets dissect it a little bit. My gut reaction is that it looks pretty slow, I would expect a health cam/gear setup to gain nearly a second over what it was capable with as a bolt on car, but that can vary some.

I suspect there are some issues with your mail order tune as well. Your launch sounds suspiciously like it's probably riding the RPM vs. MPH limiter - from the factory these cars have a table that limits the RPM to 5000rpm until the vehicle is moving over 10mph. This can make launching a stick car on a good track with a good tire tricky - you need more RPM than that unless you're coming off a two-step. I have a good quick video about this on my YouTube that might apply here.



I also have a lengthy video on launch techniques for these heavy M6 cars. You might find this valuable as well.

great info here!
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Old 06-18-2022, 12:39 PM   #19
sr530
 
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Originally Posted by LS1Formulation View Post
Took my car to the track Friday, on the first pass I tried to feather the clutch out of the hole and just smoked it. It slipped badly when I shifted, so I got out of it and coasted through. Waited 3 hours to let it cool, made another pass and ran a 12.52@111 with a 1.78 60'. My clutch is definitely toast, even on that pass I could smell it after I hit the return road.
My Hitmaster clutch hit controller allows you to incrementally loosen up clutch engagement until you find your sweet spot. Far safer for your clutch vs occasionally blowing past the sweet spot while trying to find it with your foot.

Grant
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Old 06-20-2022, 03:25 PM   #20
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Originally Posted by sr530 View Post
My Hitmaster clutch hit controller allows you to incrementally loosen up clutch engagement until you find your sweet spot. Far safer for your clutch vs occasionally blowing past the sweet spot while trying to find it with your foot.

Grant
This is why a pedal stop is so great, you consistently are right at the end of the friction zone at "full" travel.
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Old 06-21-2022, 10:11 AM   #21
sr530
 
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Hitmaster is a positive displacement device that momentarily limits throwout bearing return travel, converting your clutch into a 2-stage unit. 1st stage of limited TOB travel allows you to consistently hit the clutch's sweet spot for launch slip without blowing past it, a timer then controls dwell time in that sweet spot before allowing the transition to the 2nd stage of full clutch clamp pressure. The clutch only slips as long as you want it to.



Far better than a pedal stop alone, and far more precise than modulating clutch engagement with your foot. Just dump the clutch and let the Hitmaster control slip rate.

Grant
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Old 06-21-2022, 10:31 AM   #22
acammer
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Quote:
Originally Posted by sr530 View Post
Hitmaster is a positive displacement device that momentarily limits throwout bearing return travel, converting your clutch into a 2-stage unit. 1st stage of limited TOB travel allows you to consistently hit the clutch's sweet spot for launch slip without blowing past it, a timer then controls dwell time in that sweet spot before allowing the transition to the 2nd stage of full clutch clamp pressure. The clutch only slips as long as you want it to.



Far better than a pedal stop alone, and far more precise than modulating clutch engagement with your foot. Just dump the clutch and let the Hitmaster control slip rate.

Grant
I agree, definitely a better, more automated way to do it. I'm in it for the challenge, and the enjoyment of doing something well most people struggle with.
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Old 06-21-2022, 03:38 PM   #23
sr530
 
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I agree, definitely a better, more automated way to do it. I'm in it for the challenge, and the enjoyment of doing something well most people struggle with.
Nothing wrong with that, much the same reason I make my clutch hit controllers.

Grant
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