rickou812

iTrader: (10)

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

gametech

iTrader: (1)

Could you do the appropriate math and input a corresponding bullshit tire size to make up for the gear?

rickou812

iTrader: (10)

That is what I was thinking....
but how the hell do I figure out the "New" tire size, and what is the highest allowed gear to use???

2xLS1

iTrader: (25)

What version of LS1edit are you using? I just tried it with V1.5 and it seems to have let me enter 4.89 without giving an error.

rickou812

iTrader: (10)

I have version 1.5 also... I wonder if it is do to the 98PCM??

2xLS1

iTrader: (25)

When did you get the error? When you made the change or when you went to flash the file. I didn't try to flash, just edited a 98 M6 Fbody file I have.

rickou812

iTrader: (10)

It does it immediately when "Apply gear and tire scale" is hit.
It says "This value is out of integer range! It will be set to 65535"

2xLS1

iTrader: (25)

Sent you a PM.

rickou812

iTrader: (10)

Pm replied, thanks

2xLS1

iTrader: (25)

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.

rickou812

iTrader: (10)

Thanks for giving it a try. I just wonder, other than an inaccurate speedo, what else is affected??

2xLS1

iTrader: (25)

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.

2002_Z28_Six_Speed

iTrader: (19)

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.

12secSS

iTrader: (30)

What size tire are you planning to use? 6.15 is the tire/gear ratio limit. The smallest tire you can input with that gear ratio is a 30" tire.

rickou812

iTrader: (10)

The problem is, it seems the the highest "pulses per mile" that the PCM is capable of is "65535"

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"

rickou812

iTrader: (10)

Yep, that is what I am figuring out..lol

So is there a work around that will work with a 26" tire?

wait4me

iTrader: (10)

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.

rickou812

iTrader: (10)

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.