not shifting into 3rd at WOT?

[fst100]

been having some issues trying to tune for 3.73 gears and shifting from 2nd to 3rd gear. i even set the mph at 57mph and the RPM at 5500 but it revs way past that as high as 6700(let off before possible catastrophic failure but fuel cut at 6850). i attached a copy of my hpt file. can anyone please see if im missing anything or a value is incorrectly adjusted?

it shifts fine at cruising speeds. havent done a part throttle 2-3 upshift yet FWIW.

heres the setup on the car:
98 firebird
motor-LQ4 mild cam 232/236 .596/.601, LT, Open Loop/MAF tune
stock 4l60e trans(~90k miles) with 10" 3200 stall
3.73 gears

[flame]

Get a log of it so we can see if the pcm is commanding the shift. I would add some pressure to the 2-3 shift. It is the weakest shift in a 4L60E.

[fst100]

i'll see if i can get a log later today. how much pressure should be added and from what ft. lb range/area? what parameters should i log?

[flame]

Here is the trans config I use. Your log will show what ft/lb area you need to increase.

[fst100]

thanks. also would a voltage drop say from 12.8v-13v down to 11.2v also cause the trans or pcm communication to not work? i noticed when i go over 5K RPMs that my dash lights up and the car stalls/cuts out for a split second then goes back to normal again. happens only above 5K RPMs though.

[fst100]

ok did not get a log scan tonight. i did get a log via my LS1M :/
at ~6100RPMs shifts into 3rd at ~62mph(commanded 58mph@5500RPMs). doesnt seem to show signs of slippage. also according to my scan at around 6200-6300RPMs via scanner the tach on the dash is bouncing off the RPM redline/limiter also causing the mph speedo to bounce in sync with it? is my VSS and/or gearing setup correctly in my hpt file?

[CoolAid]

http://www.hptuners.com/forum/showthread.php?t=31591

[fst100]

thanks coolaid. read that already but im running the beta and on a 98 pcm that only has gear/tire option under speedo.

[flame]

I kinda wondered what your tire size was and if your speedo was off when I looked at the tune. You take your tire diameter and divide by your rear gear ratio to get that number. Did you add some pressure yet?

[fst100]

add what pressure? i orignally had the tire height 6.57(actually measured the tire height to be 24.5" tall). after checking online for 245/50/16 and re-calculating and getting a new number to be 6.88 and re-scaled and the mph actually fell to 61mph which is where it shifted 2nd to 3rd. so im going to just change the RPM that was at 5500 to about 6100 and see if it shifts at the MPH and RPM.

regarding the tach hitting its limit, does that have anything to do with the fuel>cutoff, DFCO>RPM Limit>bad vss cutoff/resume? mines currently at 6200/6199

[flame]

You are making more power than stock and have a stock trans. Add some pressure ot the upshift table in the ft/lb range that you are in. For WOT I usually set it to max. The gauges in these cars are not the most accurate but I would set the badd vss limits the same as your limiter.

[fst100]

i increased the shift pressure some from the 240ft lb on up but uncertain how much to increase them by? any suggestions and/or a hpt file i could gander at to get an idea of how much to increase by please? i am at work and the current hpt file is at home in my laptop so i can upload it when i get home after work today. i also increased the bad vss like u mentioned to match whats on the fuel cutoff limiter/resume at 6800/6799RPMs

TIA for the helpful tips

[flame]

Try 90 if its too much then back it down. That number is just refering to the column in the force motor current table which equates to line pressure if you look up the chart. Heat kills transmissions which is caused by slipping so harder is better unless its too much and breaking parts!

[fst100]

i was told that the lower the FMC the more amperage is introduced but too low a FMC value can also be bad and cause internal issues? also the FMC current table would affect all gears not just one specific gear correct?

[flame]

I'm not saying to change the fmc table. I was just letting you know that the pressure modifier tables are just referencing it. Zero amperage is max line pressure.

[fst100]

ah okay. gotcha. any idea(s) on how much and where to adjust the shift pressure though for 2nd gear? i recall i currently have 240ft/lb and above increased by 25-30% and around the 475ft/lb and up at 95psi

[flame]

It will depend on the condition of the trans. Mine has already been upgraded and the shift kit looks after most of it. Just play around with it.

[Dubsilverado]

I was hoping for some help. 2012 silverado mast motor sports vvt cam comp valve springs, kooks long tube headers no cats. It make 392 rwhp in Denver
Decided to put a stall in and started to have issues. Everything worked good
for 100 miles. I shut the truck off and started then lost 3rd through 6 gear.
Tuner was no help said tranny needed rebuilt. No luck gm said tranny was fine,reflashed ecm & TCM still wont shift. Does any body no were to start?