I have been having an intermittent problem at WOT at the track lately. The car will fall right on its face 'sometimes' at WOT.

http://j.cz28.com/wotupshift.jpg

Graph here. If you look at it, it seems the cpu is commanding the shift for some reason..... The previous 6 runs that day had no problems. I did change the tune before the 3rd run, otherwise it stayed the same for 4th to the 7th run. Log shows rpm, tps and mph (which is the parameters the cpu looks for i believe) Running in SD mode if that makes any difference. Trans is converted to vacuum mod. Of course this problem occured in the Final round :oops:

Is there more than 1 place the computer 'sees' vehicle speed ? The only thing I can think of is another intermittent problem : In the burnout box 'sometimes' the mph gauge will be lazy for 1-1.5 sec then jump up real fast.... It is not tied to the upshift problem 100%, (IE when this problem occurs, it does not indicate the other problem will on that particular run) but thought something might be connected there ?

I have the .tun file if anybody wants to take a look.

Thanks for any input here.
'J