No WOT Downshift from 3rd
12-17-2003, 08:21 AM
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No WOT Downshift from 3rd I installed the GM hotcam over a weekend a couple of weeks ago. Install went well. Installed the new Predator tune from James at RWTD. Ever since that weekend, I have a issue that I can not come up with an answer on. (99 SS a4)
From a stop, 1/4 accel, vehicle shifts rapidly 1,2,3 before 30mph, then If i go WOT, vehicle stays in 3rd for about 3 seconds Then it will jump into 2nd. After doing some logging of this event,
The only thing i saw was 4.3 volts at tps, 26mph in 4th gear at 1350 rpms. Stays this way for about 9 frames, then finally goes into second gear. No getting any slippage, feels like a M6 in 6th gear at 40 mph when you go WOT, just boggs down.
This also happens with a stock tune. Seems like it happens more if im in drive and not Overdrive, but i wouldnt think that would matter...
any ideas?
From a stop, 1/4 accel, vehicle shifts rapidly 1,2,3 before 30mph, then If i go WOT, vehicle stays in 3rd for about 3 seconds Then it will jump into 2nd. After doing some logging of this event,
The only thing i saw was 4.3 volts at tps, 26mph in 4th gear at 1350 rpms. Stays this way for about 9 frames, then finally goes into second gear. No getting any slippage, feels like a M6 in 6th gear at 40 mph when you go WOT, just boggs down.
This also happens with a stock tune. Seems like it happens more if im in drive and not Overdrive, but i wouldnt think that would matter...
any ideas?
12-18-2003, 10:26 AM
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Originally Posted by SS891
I installed the GM hotcam over a weekend a couple of weeks ago. Install went well. Installed the new Predator tune from James at RWTD. Ever since that weekend, I have a issue that I can not come up with an answer on. (99 SS a4)
From a stop, 1/4 accel, vehicle shifts rapidly 1,2,3 before 30mph, then If i go WOT, vehicle stays in 3rd for about 3 seconds Then it will jump into 2nd. After doing some logging of this event,
The only thing i saw was 4.3 volts at tps, 26mph in 4th gear at 1350 rpms. Stays this way for about 9 frames, then finally goes into second gear. No getting any slippage, feels like a M6 in 6th gear at 40 mph when you go WOT, just boggs down.
This also happens with a stock tune. Seems like it happens more if im in drive and not Overdrive, but i wouldnt think that would matter...
any ideas?
From a stop, 1/4 accel, vehicle shifts rapidly 1,2,3 before 30mph, then If i go WOT, vehicle stays in 3rd for about 3 seconds Then it will jump into 2nd. After doing some logging of this event,
The only thing i saw was 4.3 volts at tps, 26mph in 4th gear at 1350 rpms. Stays this way for about 9 frames, then finally goes into second gear. No getting any slippage, feels like a M6 in 6th gear at 40 mph when you go WOT, just boggs down.
This also happens with a stock tune. Seems like it happens more if im in drive and not Overdrive, but i wouldnt think that would matter...
any ideas?
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