scca stock class becoming street class!
11-05-2014, 04:32 PM
#331
11-05-2014, 05:12 PM
#333
11-05-2014, 11:56 PM
#334
Dyno plot * gearing on whatever seems like the most likely autocross tire size. I use dyno plots I find on the internet; whenever possible I try to find a few and pick the one that seems median, and I only use Dynojet plots to minimize dyno-to-dyno variation, but regardless I wouldn't hold these up as the indisputable truth.
Ask and ye shall receive:
Interesting that, as people on other forums have pointed out, the C5 doesn't have a huge acceleration advantage due to its ridiculous gearing.
Ask and ye shall receive:
Interesting that, as people on other forums have pointed out, the C5 doesn't have a huge acceleration advantage due to its ridiculous gearing.
11-06-2014, 09:56 AM
#335
Drifting
Maybe not vs the Boxster at low speeds, but it's more powerful than the AP2 off the line, and from 40-50mph when C5 is still in first and everyone else is down to 2nd, holy crap!
I'd love to see a comparison of 987.1CS vs C5Z, too.
I'd love to see a comparison of 987.1CS vs C5Z, too.
11-06-2014, 02:33 PM
#337
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Am I reading this wrong? It seems to indicate there is NO speed overlap for the 987 between 2nd and 3rd. Is that even possible?
If the top of 2nd was 88mph and there was time-warp jump forward, well obviously that would make total sense. But I don't understand the gap between ~66 and ~73 mph from top of 2nd to bottom of 3rd.
If the top of 2nd was 88mph and there was time-warp jump forward, well obviously that would make total sense. But I don't understand the gap between ~66 and ~73 mph from top of 2nd to bottom of 3rd.
11-06-2014, 10:19 PM
#339
11-07-2014, 09:14 AM
#340
11-07-2014, 10:48 AM
#341
On a tangent:
For poops and giggles I did thrust charts for my car (G is just thrust / weight, right?) from a dynojet chart of a car similar to mine on 911chips.com, gearing info from gboxweb.com, and my actual car weight with me in it.
The lower lines are with my current 255/40-17, the upper are if the rumored 245/40-15 become reality. If I did it right, damn. That's eye opening.
11-07-2014, 06:36 PM
#342
In autocross everyone winds out their cars, so to keep the chart cleaner I don't bother plotting third gear thrust values until close to the top of second gear, but it looks like I accidentally started the third gear plot at too high a speed.
Last edited by PedalFaster; 11-09-2014 at 08:35 PM.
11-24-2014, 10:45 PM
#343
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On non-PASM cars, PSM can be disabled by disconnecting the yaw sensor under the center console. Unfortunately, the yaw sensor is also one of the inputs to the PASM ECU, so it cannot be disabled on PASM cars without also disabling PASM, which will in turn set the shocks to their basic, default setting...
12-16-2014, 01:26 PM
#344
Drifting
Good news: new SEB minutes state IMS replacement is legal in Street Class. Should be official in the next FastTrack:
#15097 Repair Method Comments
Add to Appendix F under Street Clarifications:
“Replacement of the failure-prone intermediate shaft (IMS) bearing on Porsche Boxsters with a similar part which serves the same purpose is compliant with the new 13.1 allowance for common-sense repairs.”
Add to Appendix F under Street Clarifications:
“Replacement of the failure-prone intermediate shaft (IMS) bearing on Porsche Boxsters with a similar part which serves the same purpose is compliant with the new 13.1 allowance for common-sense repairs.”
12-16-2014, 01:30 PM
#345
Burning Brakes
We discussed the IMS (due to that letter) and since we felt the common sense repair line being added for 2015 didn't cover the IMS explicitly, we recommended adding this and apparently the SEB agreed.