Ever since I went turbo my trans does not like to shift. Under light throttle it isn't as noticeable and med you can just notice it. But at WOT it is really bad. I will get to the point where the car should shift and it will just hold the rpm for a sec or two and then shift. When it does this at WOT it slams into the grear pretty hard. 1st gear to 2nd gear is the worst. I thought maybe it was in the TM so I pretty much shut TM off and it still does it. Maybe I missed something. Also I am out flowing my maf, whether or not that matters? Anyone have any ideas?

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Red 2dr 99 GTP: Z7 t66, A/A IC'd, Custom Heads, 65# Inj, ST2 Cam, Meziere Elec Pump, JP Double Roller(with machined crank gear), Plogs, PLX W/B, Powrtuner

99 Regal GS (work car)

You need a tune and trans set up for the power levels unquestionably! If your trans is stock then it is going to hate you with a turbo. Is anything done to your trans at all? A maxed out maf table is much better than one that isnt reading high enough as low maf signal will definately cause delayed shifts. You are going to have to lower your shift speeds and up your shift pressure tables quite a bit. I have no idea what you have for pcm settings now but you will definately need to do some tuning with the trans parameters.

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4T65E Transmission Info
Voted GPF.net's Community Hero

I guess I could have given you some more info right away .

It is still a 100% stock trans, the shift pressure and shift time are the same as a zzp 1.0. Can you raise the shift pressure above 96psi through the pcm? If not how soon in the step table do you have the pressure at 96psi, I am using a dhp for tuning btw.

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Red 2dr 99 GTP: Z7 t66, A/A IC'd, Custom Heads, 65# Inj, ST2 Cam, Meziere Elec Pump, JP Double Roller(with machined crank gear), Plogs, PLX W/B, Powrtuner

99 Regal GS (work car)

I dont know if DHP offers this since I use HPT, but there is a Force Motor Current table, or two tables depending on the pcm. This is the desired pressure control solenoid amperafe vs commanded pressure table number. 0 being low pressure and this means higher amps, 1 is max, and 96 or 100 is the high end of the pressure table, and 0 amps is max line pressure but you generally cant turn this all the way to 0 or it will throw a code. Also I dont know what you can and cannot watch with the scanner, but you need to go out and drive the car at WOT when this is happening and watch "Commanded PCS Amps" If it is around .2 then it is too high and not generating enough pressure for what your trans is requiring. A shift kit set on medium to high setting would probably help you out greatly since your trans is stock and soon to be a pile of black dust under the car! If you can view commanded amps then you know what the pcm is wanting for amps and you can look up on the amperage table in the tuner where that number is at and make adjustments, which a lower number will produce higher line pressure. Get all of that? lol

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4T65E Transmission Info
Voted GPF.net's Community Hero

My dhp doesn't have any of that. I have been thinking of getting an HPT. Is it worth the extra money?

I went back and looked at my tune again and found that none of my perf shift pressures were changed? I copied a zzp 1.0 pcm file? So I up'd all of my pressures and it feels better but I still can't really tell because I can't do a WOT shift because I out flow my maf. I need to get my afc installed.

On a side note the tranny feels a bit loose durning the shifts I am hoping it lasts the summer.

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Red 2dr 99 GTP: Z7 t66, A/A IC'd, Custom Heads, 65# Inj, ST2 Cam, Meziere Elec Pump, JP Double Roller(with machined crank gear), Plogs, PLX W/B, Powrtuner

99 Regal GS (work car)

Why do you want to install an AFC if you have a tuner? You can adjust your entire maf table with the tuner and is going to do the exact same thing as an AFC and is one less thing to plug in and fail. Even though you currently are maxing out the maf why not go WOT? you can work on plenty of things in the tune go help that out, or just go to a larger throttle body or maf sensor to give yourself more head room. If you used a ZZP file and it was for an 01 or newer car then likely the perf shift tables are still stock since 01 and up never had the performance shift button and I dont think they modify those tables but it should certainly be changed on an 00 and earlier pcm.

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4T65E Transmission Info
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I need an afc to scale my maf, and it doesn't pay to install a bigger tb and maf because I am sure I will end up out flowing them also. Plus I already own the AFC I just haven't installed it yet.

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Red 2dr 99 GTP: Z7 t66, A/A IC'd, Custom Heads, 65# Inj, ST2 Cam, Meziere Elec Pump, JP Double Roller(with machined crank gear), Plogs, PLX W/B, Powrtuner

99 Regal GS (work car)

Why cant you scale you maf with your tuner? Just add of reduce the cells in the hertz range that you need. Do you have a histrogram on dhp? or something to plot against the maf to see how much it is off by? just curiouse. You must have been working a lot latley? havent seen you around here in a while.

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1999 Silver GTP~HP Tuners~XP cam~ZZP FS Intercooler~ZZP 78mm Billet Throttlebody~LQ4 MAF~Lucas 42.5's~Coated Pacesetters~2.8 MPS~PRJ fuel logs~Ported & Polished S/C~JMB fwi ~Built Tranny-3.29's-7/8's chain-Intense forged Input Shaft~

Running mid-high 12's

The AFC doesnt do anything you cant do with your tuner, it was a way to retune the maf when tuners werent out yet or just to give you a way to make small changes without the tuner being used, but as soon as you make any change with an AFC your fuel trims will be off and tuning needs to be done to correct that anyways.

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4T65E Transmission Info
Voted GPF.net's Community Hero

From what I can see and have always been told you can't scale the maf with a tuner, you need an afc for that. You can't change the hz with the tuner you need an afc for that. My fuel trims aren't correct right now anyways so they need to be tuned. When my maf is putting out a reading of say 20,000 hz I want the pcm to read it as 10,000 hz so I am still under 11500 hz on the pcm maf table. There is no way of doing this with the tuners. As far as I know pretty much every turbo car running over 10psi is running an afc or larger maf. Also from what I have been reading there isn't a maf that will not be out flown my 20psi+ if so they probably cost more than an afc. I could be wrong about all of this so if I am explain how you can scale the maf with a tuner.

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Red 2dr 99 GTP: Z7 t66, A/A IC'd, Custom Heads, 65# Inj, ST2 Cam, Meziere Elec Pump, JP Double Roller(with machined crank gear), Plogs, PLX W/B, Powrtuner

99 Regal GS (work car)