Smooth Throttle for UpRev

Awgd8 · 09-15-2014, 05:04 PM

Hi guys! I just want to verify your G37 1:1 gear ratio (4th gear?) and see how does the RPM tach behave at 60MPH and floor it .... Does it kind of shoot up from less than 3K and stays in 3K while your gunning it and sloooowly creeps above 3K RPM ? Or does the tach shoot up above 3K RPM right away like how the 3rd gear behaves....?

Also, lets say you red line in 3rd gear and shift to 4th, how low does the RPM dropped after shifting to 4th gear? Or whatever 1:1 gear ratio you have in the car.

I like to verify this bec. I did try to merged in the highway this morning and floored it in 3rd gear and when I shift at 4th, the car is pulling , but my tach kind of stay longer in 3K RPM and very slow to rev up above 3K as it pulls or gain speed. I do not remember this instances since I hardly floor or gun my throttle on 4th. MY car has 5 A/T tranny so 4th is my 1:1 gear ratio. 1st, 2nd and 3rd gear Tachometer bounces up quickly like a horny rabbit, but 4th seems slower...

juicinjake · 09-20-2014, 02:11 AM

whats is the stall speed on your converter? it sounds like your transmission was slipping up until stall speed like its supposed to... until you got enough speed to lock up in that gear. when you did your revs started climbing with respect to your speed again. prior to that your speed was climbing but your rpm was holding constant (indicating slippage). that said, thats perhaps slightly more relative to the older domestic automatics that i actually have experience with. modern transmissions with electronic control units really are designed to vary the line pressure to smooth a lot of that out. perhaps what has happened was that in all this throttle and vvel tuning, your base fuel schedule for a given rpm range has increased/decreased due to running a larger/smaller cam profile at that speed and therefore requiring more/ess fuel. this means that the value plugged into your calculated load map is now off and that can affect transmission performance. log your calculated load and base fuel schedule and make sure thats not off anywhere... especially in that 3k range where you are experiencing the slip. if all that checks out id say that your converter is just slipping, as intended, to allow the engine to get up into its powerband. the only reason u notice it in 1:1 and not the other gears is because its a long gear. in the lower gears you probably accelerate past that point of slippage quicker and dont even notice it.

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09-15-2014, 05:04 PM	#1 (permalink)
Awgd8 Base Member Join Date: Sep 2013 Location: WI Posts: 165 Drives: 2015 Q40 / 2008 EX35 Rep Power: 12	Hi guys! I just want to verify your G37 1:1 gear ratio (4th gear?) and see how does the RPM tach behave at 60MPH and floor it .... Does it kind of shoot up from less than 3K and stays in 3K while your gunning it and sloooowly creeps above 3K RPM ? Or does the tach shoot up above 3K RPM right away like how the 3rd gear behaves....? Also, lets say you red line in 3rd gear and shift to 4th, how low does the RPM dropped after shifting to 4th gear? Or whatever 1:1 gear ratio you have in the car. I like to verify this bec. I did try to merged in the highway this morning and floored it in 3rd gear and when I shift at 4th, the car is pulling , but my tach kind of stay longer in 3K RPM and very slow to rev up above 3K as it pulls or gain speed. I do not remember this instances since I hardly floor or gun my throttle on 4th. MY car has 5 A/T tranny so 4th is my 1:1 gear ratio. 1st, 2nd and 3rd gear Tachometer bounces up quickly like a horny rabbit, but 4th seems slower...

09-20-2014, 02:11 AM	#2 (permalink)
juicinjake Base Member Join Date: Aug 2014 Location: Lubbock, TX Posts: 18 Drives: 13 Nismo 370Z/05 G35 Rep Power: 11	whats is the stall speed on your converter? it sounds like your transmission was slipping up until stall speed like its supposed to... until you got enough speed to lock up in that gear. when you did your revs started climbing with respect to your speed again. prior to that your speed was climbing but your rpm was holding constant (indicating slippage). that said, thats perhaps slightly more relative to the older domestic automatics that i actually have experience with. modern transmissions with electronic control units really are designed to vary the line pressure to smooth a lot of that out. perhaps what has happened was that in all this throttle and vvel tuning, your base fuel schedule for a given rpm range has increased/decreased due to running a larger/smaller cam profile at that speed and therefore requiring more/ess fuel. this means that the value plugged into your calculated load map is now off and that can affect transmission performance. log your calculated load and base fuel schedule and make sure thats not off anywhere... especially in that 3k range where you are experiencing the slip. if all that checks out id say that your converter is just slipping, as intended, to allow the engine to get up into its powerband. the only reason u notice it in 1:1 and not the other gears is because its a long gear. in the lower gears you probably accelerate past that point of slippage quicker and dont even notice it.