help!!trans not shifting when commanded..

[klymaxr]

Can Anyone chime in here for a bit of advice, I have a 2001 c5 ,tci billot 3500 stall,3.15 gears, 425ci 684rwtq/635rwhp. the engines peek power is 6300/4300. I have the shift rpm set at 6100 for 1-2,6000 for 2-3 and 5900 for 3-4, Rev limiter is set at 6799rpm, mph thresholds are 40-78-139 each gear 1>3. When naturally asperated the shift were fine at even higher mph IE:40-80-140 and rpm was 6100,6100,6000. With the 125 shot of nos it was really hitting the rev lmtr soo i lowered all parameters except 1-2 cause it still shifted ok, but even lowering them to the above thresholds it would still bounce off the limiter in 2-3 gear!! my shift time tables are at .150-.250 sec
Can anyone help.? why does it gain at least 800 rpm before the shift occurers? My pressures are slightly modified, but i do not understand some of the tables or what the max values should be in each cell, if somone could give me some insite as to what a nice hard performance trans presure patern should look like i'd very much appreiciate it.
max

[WS6FirebirdTA00]

Well I think the issue lies in the tranny itself. I did my friends car and I have a 6400 shift point to shift at 6000 from 1-2 and 5600 to shift at 6000 on 2-3

[usd2sing]

subscribed. interested in the responses.

[Special K]

I've got a '03 Vette. It would not shift when commanded. I had to zero out all MPH upshift settingsi in Normal. Hot and Performance.

I also had to zero out the MPH in 'Part Throttle Shift' from 69% to 100% throttle position. I did this in Normal, Cruise, Hot and Performance. It now shifts exactly when commanded.

Hope this helps.

[Rockets]

I'm working on an 04 GTO with 570 RWHP and a 3200 stall. Before we upped the HP (by about 100) the thing shifted fine. Now I can't get it to shift 2-3 or 3-4 at WOT no matter what, with lower line pressures or even telling it to shift at 4500 RPM. I managed to get a 1-2 WOT shift telling it 5600 RPM (shifting at 6200 RPM). I'm wondering if the new power is increasing the stall, and causing a lag on the shift... It seems I have a similar problem to you, Klymar. Anyone have any ideas?

[Wilde Racing]

My truck Just started doing this as well, Which makes me think it is a mechanical problem. but My logs show the VCM not commanding the shift until it bounces of the limiter a few times.......

[Special K]

I'm working on an 04 GTO with 570 RWHP and a 3200 stall. Before we upped the HP (by about 100) the thing shifted fine. Now I can't get it to shift 2-3 or 3-4 at WOT no matter what, with lower line pressures or even telling it to shift at 4500 RPM. I managed to get a 1-2 WOT shift telling it 5600 RPM (shifting at 6200 RPM). I'm wondering if the new power is increasing the stall, and causing a lag on the shift... It seems I have a similar problem to you, Klymar. Anyone have any ideas?

I posted what worked for me. I think that could be considered an idea.