Downshift for passing tune
10-22-2013, 07:02 PM
#1
Downshift for passing tune I have a 4l80e that I want to tune so that it will downshift in a passing situation. Right now I have to almost floor it to get it to downshift from fourth to third and OD to third. Should I change the TPS to WOT settings?
10-23-2013, 12:30 AM
#5
Ok. Its an LQ9 iron block 403 with 9.5 comp, F1A Procharger, Edelbrock intake, 83bl injectors, FTI 3600 stall and 4l80e. My last WOT log showed approx 13psi boost using Hptuners Pro software.
Last edited by Monte4ever; 10-23-2013 at 12:37 AM.
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10-23-2013, 04:43 AM
#8
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Curious as to why you want it to downshift. I tuned my A4 to only downshift from 4th to 3rd, never 3rd to 2nd, or 2nd to 1st. I did this because even with drag radials 1st and 2nd are useless over 35% TPS. You should be making near or above 700rwhp with your combo so your power band should be such that you don't need the gear especially with the 3600 stall. Any way, if you are using HPTuners then:
Trans - Part Throttle Normal - "Shift Speed vs %TPS vs Shift" is the table that you want.
Trans - Part Throttle Normal - "Shift Speed vs %TPS vs Shift" is the table that you want.
Last edited by Mister Peebody; 10-23-2013 at 04:56 AM.
10-23-2013, 08:50 AM
#9
In the highlighted cells, once you are above that MPH it won't downshift. Put higher numbers in those cells to make it downshift with less throttle input. One way you can do it is to decide on a spread between the upshift mph and the downshift mph for each tps setting. For example on the 2-3 ans 3-2 try something like 15 mph. For every cell where the difference between the two numbers is more than 15 mph, increase the number in that downshift cell to where the difference is 15. Try different spreads until it is downshifting how you want it to.
10-24-2013, 04:23 PM
#10
Curious as to why you want it to downshift. I tuned my A4 to only downshift from 4th to 3rd, never 3rd to 2nd, or 2nd to 1st. I did this because even with drag radials 1st and 2nd are useless over 35% TPS. You should be making near or above 700rwhp with your combo so your power band should be such that you don't need the gear especially with the 3600 stall. Any way, if you are using HPTuners then:
Trans - Part Throttle Normal - "Shift Speed vs %TPS vs Shift" is the table that you want.
Trans - Part Throttle Normal - "Shift Speed vs %TPS vs Shift" is the table that you want.
Last edited by Monte4ever; 10-24-2013 at 04:30 PM.
10-24-2013, 04:25 PM
#11
In the highlighted cells, once you are above that MPH it won't downshift. Put higher numbers in those cells to make it downshift with less throttle input. One way you can do it is to decide on a spread between the upshift mph and the downshift mph for each tps setting. For example on the 2-3 ans 3-2 try something like 15 mph. For every cell where the difference between the two numbers is more than 15 mph, increase the number in that downshift cell to where the difference is 15. Try different spreads until it is downshifting how you want it to.
