Starting to Learn on 95 G30 5.7 for Towing

**donf** · 08-27-2017

Does anyone happen to know the math that is used to come up with the RPM/VSS Ratio? I have my stock bin downloaded. I compared it to a few other bin files here and most of the transmission settings were identical except for the NV ratio for the final drive differences. Billy, I tried to PM you but it says your inbox is over the storage limit.

Edit: I found a few different formulas for the N/V ratio, but this one seems to be the most relevant? Ratio = (Tire Rev's Mile x Gear Ratio)/60; http://www.gearhead-efi.com/Fuel-Inj...ht-programming

**myburb** · 08-28-2017

I think that is the correct formula. Looks like with your new 4.10 depending on your tire size should be about 47.xx.

**donf** · 08-28-2017

Thanks, I got close to that using tireracks revolution per mile for 24575R16. For some reason different tire manufactures give slightly different specs, but I think it will be close enough.

**myburb** · 08-28-2017

While I had the calc out, with that tire size it should be 45.27

**donf** · 08-31-2017

I was able to burn a few different chips over the last few days, so some success! Thanks to John and Billy and the others who helped out here. There still is a lot to learn, but when things go right it helps!

**donf** · 09-06-2017

More success! The problem with erratic readings in Tunerpro when the engine was running was driving me nuts. 1320_John loaned me one of his custom bluetooth ALDL to try. Using his adapter and his android software I now have a stable connection to data with the engine off and engine running.

**donf** · 09-15-2017

Now with actual data in Tunerpro RT (Thanks John), I did a test drive and had a few questions.
I used A218_0d_Trans1_v250.adx. I looked at shift times and the 1 ->2 and 2->3 upshift times are both 0.6 that looks okay to me. What has me worried a little is something called Desired and Actual Shift Time Error. The Desired and Actual Shift Time Error 1->2 upshift is 0.1. The Desired and Actual Shift Time Error 2->3 is listed as 5.8 I am not sure if that is a problem or not. The 2-3 shift seems very solid. The little information I can find says it's part of the transmission adaptive pressure system for the transmission. On youtube one person was talking about a similar bit of data only being a problem when it was in the upper 20's so this all may be normal
A second test drive saw the last shift time 2->3 drop to 0.4 and the Actual Shift Time Error 2->3 increase slightly to 6.0, so hopefully it's just the trans trying to take a little pressure away and not some problem. I just want to be sure as if there is a problem I don't want to wait to fix it. The pressure and shift time tables are factory and unaltered. I did alter the speed tables for the 3-4 shift point and light throttle, no other trans settings have been touched.