PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

Tuning question.

Old Jul 16, 2005 | 10:06 PM
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Heres the scenerio - I installed 3.42 gears, a TCI SSF convertor (tightened up a touch), and 295/50-15's (26.7-in tall). I used my HP Tuners software to recalibrate the gear, tire size and diameter. I also recalibrated the shift points at WOT to 5500/5500/5800 as well as moving the "P/N cutoff" and "Bad Vss Cutoff RPM" to 6700.

Having done all of this the car drives MUCH better at part throttle and all the way up to maybe 8/10ths throttle but when hammered all the way to the floor it still appears that it is getting onto the rev limiter before it shifts. Is there something that I missed? I am beginning to think that I have a bad spark plug as well but I do not see how that could be making it appear as if it is on the rev limiter. Any suggestions? Thanks in advance for any and all help.

Jim C.

PS- I did a search in the forums for various subjects relating to this but didn't really find anything that pertained to my delima here or at the HP site.
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Old Jul 16, 2005 | 10:10 PM
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I don't know much about automatics but i'll give it a shot. To shift both the shift speed and rpm must be met so make sure your shift speeds aren't too high.
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Old Jul 18, 2005 | 07:18 AM
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Thanks, I will take a look at that and make sure to adjust the shift speeds as well. Thank you for your help.

Jim C.
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Old Jul 18, 2005 | 07:30 AM
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yeah i havent messed with but one auto, but you have to set the shift speeds lower as well
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Old Jul 19, 2005 | 08:16 AM
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Originally Posted by WS6FirebirdTA00
yeah i havent messed with but one auto, but you have to set the shift speeds lower as well
Can one scale this feature or do I need to calculate it myself to match the shift RPM?

Jim C.
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Old Jul 19, 2005 | 08:22 AM
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my guess would be to calculate it, there is a site that does this ill have to get it when i get home. fbody.org/gears, something along those lines i think
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Old Jul 19, 2005 | 11:35 AM
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If you have a log file, just look at the speed you're at right before you hit the rev limiter.
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