Twin Turbo 928 fixed and back out there terrorizing the streets!
09-02-2020, 07:14 PM
#2492
Nordschleife Master
Thread Starter
Showing off
The car needs stop by here before coming home:https://carshowsnow.com/event/29th-a...i-too-reunion/
When:
September 27, 2020 @ 9:00 am – 3:00 pm
Where:
Germania Society
3529 W Kemper Rd
Cincinnati, OH 45251
USA
So coming home on 9/28...
29th Annual VW, Porsche + Audi too Reunion
JUNE 7, 2020 CSN ADMINWhen:
September 27, 2020 @ 9:00 am – 3:00 pm
Where:
Germania Society
3529 W Kemper Rd
Cincinnati, OH 45251
USA
So coming home on 9/28...
Last edited by ptuomov; 09-02-2020 at 07:15 PM.
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Fabio421 (09-06-2020)
09-02-2020, 07:30 PM
#2493
Nordschleife Master
Thread Starter
Tuomo --
Are you guys fitting any kind of traction-control smarts? Your 'burns rubber to 120' comment sounds ominous. In my brief experiences with cars that did that, driveline problems seemed to max out when tires finally hooked up again unless there was a very specific effort to get out of the throttle to make that happen.
I know that there's a lot of discussion on Turbo Todd's build description about adding rear weight for traction, along with some active engine-management efforts. You are using the Bosch LH and EZk controllers, which at least in the later versions have a pressure-switch input to reduce power via ignition timing for auto gearbox protection in high-load upshifts. Short of a "drive-by-wire" (vs. "drive-by-cable") throttle, or some inputs to an electronic boost controller, there has to be something you can do to protect the gearbox and axles.
Are you guys fitting any kind of traction-control smarts? Your 'burns rubber to 120' comment sounds ominous. In my brief experiences with cars that did that, driveline problems seemed to max out when tires finally hooked up again unless there was a very specific effort to get out of the throttle to make that happen.
I know that there's a lot of discussion on Turbo Todd's build description about adding rear weight for traction, along with some active engine-management efforts. You are using the Bosch LH and EZk controllers, which at least in the later versions have a pressure-switch input to reduce power via ignition timing for auto gearbox protection in high-load upshifts. Short of a "drive-by-wire" (vs. "drive-by-cable") throttle, or some inputs to an electronic boost controller, there has to be something you can do to protect the gearbox and axles.
09-02-2020, 07:31 PM
#2494
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09-05-2020, 06:34 PM
#2496
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Thread Starter
09-05-2020, 06:43 PM
#2498
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09-05-2020, 06:56 PM
#2499
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09-05-2020, 10:19 PM
#2500
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Awesome, looking forward to hearing your driving impression.
09-15-2020, 02:54 PM
#2504
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You -might- consider having the AC compressor drop out when engine exceeds some handy number like maybe 6000 RPM's, and not be allowed to re-engage until less than something like 3000 RPM's plus a couple seconds. That will help save the compressor from any possible overspeed events, better chance of keeping the belt on the pullies, and limit the stress and vibration load on the support bracket. Early cars had a speed cutout configured for high-load operation, likely for both compressor survival and the power. Unlikely you will be cruising for any extended periods at over 6000 RPM, at least on U.S. roads.
dr bob
09-15-2020, 05:18 PM
#2505
Nordschleife Master
Thread Starter
You -might- consider having the AC compressor drop out when engine exceeds some handy number like maybe 6000 RPM's, and not be allowed to re-engage until less than something like 3000 RPM's plus a couple seconds. That will help save the compressor from any possible overspeed events, better chance of keeping the belt on the pullies, and limit the stress and vibration load on the support bracket. Early cars had a speed cutout configured for high-load operation, likely for both compressor survival and the power. Unlikely you will be cruising for any extended periods at over 6000 RPM, at least on U.S. roads. dr bob