How to tune for 4.86 gear?
How to tune for 4.86 gear? I have a 98 PCM and the latest version of LS1edit. I just installed my 9" with 4.86 gear. Upon attempting to tune for the new gear I found that the 4.86 is "Out of range" per ls1edit.
So how do you tune for these gear ratios that are "Out of range"
Thanks,
Richard
So how do you tune for these gear ratios that are "Out of range"
Thanks,
Richard
It says "This value is out of integer range! It will be set to 65535"
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Verdad Gallardo Must have something to do with the VSS in the A4 vs the M6. I was trying it on a 98 M6 file and when you enter the 4.89 in the box, it changes the value in the VSS Pulses Per Mile box from 23509 to 33614 which is under the 65535 value limit that field can have in it. Your file starts out with 60975 in the VSS PPM field and entering the 4.89 gear tries to set that value higher than the 65535 limit. I tried setting a 98 A4 file to 4.89 gears with HP Tuners also and it wouldn't let me and it would on a M6 file. Sorry I couldn't help more.
Must have something to do with the VSS in the A4 vs the M6. I was trying it on a 98 M6 file and when you enter the 4.89 in the box, it changes the value in the VSS Pulses Per Mile box from 23509 to 33614 which is under the 65535 value limit that field can have in it. Your file starts out with 60975 in the VSS PPM field and entering the 4.89 gear tries to set that value higher than the 65535 limit. I tried setting a 98 A4 file to 4.89 gears with HP Tuners also and it wouldn't let me and it would on a M6 file. Sorry I couldn't help more.
After playing around with it, it looks like 4.00 is the max value you will be able to put in the gear ratio box. You will just have to live with the speedo error. All your shift tables, both part throttle and WOT plus the converter lock up tables will be effected with a speedo that is incorrect.
Why not give us the tyre size and we can figure out a new tyre size with the higher numerical gear selected?
The PCM won't know the difference cause it can't see anything past the output shaft speed sensor.
The PCM won't know the difference cause it can't see anything past the output shaft speed sensor.
Last edited by 2002_Z28_Six_Speed; Jan 27, 2008 at 11:56 PM.
SO it doesn't matter which way I go, with "tire size", "gear ratio" or a combination of both, if the "Pulses per mile" is more than 65535 and it wont allow a number higher than 65534....
I'm actually more shocked that this has not been hashed out before...
I am sure someone else has run a auto with a 4.86 gear before...
Oh and to answer your request.. tire size is 26"
To make it work you have to modify the speedometer pulses per mile speedo output from the pcm which stock is 4000 on ANY pcm regardless of tire size or rear size.. Then you have to change the Transmission pulses per mile to get the shifting to be correct. You can put the correct values in the pulses per mile, but you will have to put close to the max value in the speedo pulses per mile. It can be done, i just dont know if your software or hp gives you the ability to change that speedo output.
Well guys, this is what I am going to do to make my speedo functional/correct.
I will be using the front wheel VSS sensor that is originally used for the ABS. I do not have ABS due to the 9" rear any way. This is actually a work around for keeping the speedo when installing an A3 tranny, (which is on my to do list).
Just thought I would share, in case someone else runs into this problem.
I will be using the front wheel VSS sensor that is originally used for the ABS. I do not have ABS due to the 9" rear any way. This is actually a work around for keeping the speedo when installing an A3 tranny, (which is on my to do list).
Just thought I would share, in case someone else runs into this problem.