A4 Downshift problems
A4 Downshift problems Im tuning an 01 TA, A4 H/C, built trans 12 bolt etc. Well Got everything dialed in, but the trans will not downshift. You can put it in overdrive running 55mph then floor it, & it will stay in OD. The only way to get it to down shif is to manualy pull it down. The car shifts fine under part thorttle, & WOT. just want downshift under WOT. Ive changed everything I could with HPtuners to get it to down shif & it will not. Am I missing something here?
Well. Ive copyed & pasted all the stock values from a stock tune to the tune Im working on & still nothing. The car had already had tunning done to it before so I never had the stock tune to start with.
What tuning software are you using? Does it have a compare feature? With EFI Live, you can download a stock tune from the EFI Live or HPTuners repository and view it/save it. Then, if it's the same OS you can use the compare feature and copy the entire Transmission Calibration and Diagnostic segment in EFI Live. That way you don't have to copy individual tables. Don't know if HPT has that same feature.
I owe that little helpful piece of knowledge to Jesse (aka wait4me). Thanks Jes!
I owe that little helpful piece of knowledge to Jesse (aka wait4me). Thanks Jes!
Originally Posted by SSpdDmon
What tuning software are you using? Does it have a compare feature? With EFI Live, you can download a stock tune from the EFI Live or HPTuners repository and view it/save it. Then, if it's the same OS you can use the compare feature and copy the entire Transmission Calibration and Diagnostic segment in EFI Live. That way you don't have to copy individual tables. Don't know if HPT has that same feature.
I owe that little helpful piece of knowledge to Jesse (aka wait4me). Thanks Jes!
I owe that little helpful piece of knowledge to Jesse (aka wait4me). Thanks Jes!
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Originally Posted by wickedwarlock
there is a compare feature.
What are all the downshift tables zero'd out for? Ive looked at 4 tunes & they have all be 0's. Whats up with that are they not used? Im talking about under shift properties/Downshift they are all blank.
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Originally Posted by SSpdDmon
Shouldn't be...I don't have any 0's in my shift tables. A few 256's, but no 0's.
Originally Posted by Z'mnypit
Under where it says downshift? 2-1, 3-2, 4-3? I can post a screen print if I need to.
Originally Posted by jdaniels
They're definately not zeroed on a stock 99 file. Mine were actual numbers stock.
Those are pressure modifier tables based on trans temp (ie if the trans is shifting too hard cold or not hard enough hot, you modify those tables). I thought you were talking about MPH tables. Those pressure tables are supposed to be 0'd out stock.
Originally Posted by SSpdDmon
Those are pressure modifier tables based on trans temp (ie if the trans is shifting too hard cold or not hard enough hot, you modify those tables). I thought you were talking about MPH tables. Those pressure tables are supposed to be 0'd out stock.
Look under "4>3 Throttle Kickdown". It's based on TPS and MPH. Try changing the values to 85% or so for all mph. That should help. If not if could be the solenoid, but generall that will throw a code.
Originally Posted by DrkPhx
Look under "4>3 Throttle Kickdown". It's based on TPS and MPH. Try changing the values to 85% or so for all mph. That should help. If not if could be the solenoid, but generall that will throw a code.
This is the third time I've got some use out of this screenshot. 
These values aren't from an F-body, but it shows what you need to modify. The 1->2 shift is an upshift, the 2->1 is a downshift. Make sure none of those conflict with each other.
These values aren't from an F-body, but it shows what you need to modify. The 1->2 shift is an upshift, the 2->1 is a downshift. Make sure none of those conflict with each other.
Originally Posted by SMOKINV8
This is the third time I've got some use out of this screenshot.
These values aren't from an F-body, but it shows what you need to modify. The 1->2 shift is an upshift, the 2->1 is a downshift. Make sure none of those conflict with each other.
These values aren't from an F-body, but it shows what you need to modify. The 1->2 shift is an upshift, the 2->1 is a downshift. Make sure none of those conflict with each other.