is there a table we cant access for shift??

[strokedcoupe]

ive tried everything I can think of every way to lie to the ecu try to make it shift early it always shifts what seems to be 39mph.. no matter the rpm setting, no matter any of the mph 100% or wot settings or shift time, the rear gear/tire combo it always shifts bouncing off rev limit and 39 mph.. I have verified its the ecu not the trans logging the status bit of the shift solenoid for when it shifts. it instantly goes into 2nd when solenoid goes off.. this is driving me crazy

[mecanicman]

you post a lot of questions but no file with them. If you want help post your file.

[strokedcoupe]

ive posted a lot of questions with files and only heard crickets.. out of the 10 questions I only got 2 smart unrelated answers no one helps.. I think most of my other ones have files

[strokedcoupe]

if you look around 1:55 of log with the status bits on you can see the commanded shift at 39mph and 6500 ish don't think the is the exact tune from that log but it doesn't matter what I do it doesn't really change when it shift... I had to raise to 7000 limit so it just bumps as shift occurs.. any help would be greatly appreciated

[mecanicman]

Post your tire size/make/model and you do have 4.30 gears?

[strokedcoupe]

I have 25.2 tires and yes 4.30 gears are factory in my car .. not really any aftermarket gears .. thing is with 4.30 gears if I put 25.2 tires it maxes out the trans rev / mile at 26.78 tire and the speedo maxed out somewhere close to that also so it technically wont let the settings go that high.. but slightly different size .. ive tried tire settings all over the map .. really only made difference in the part throttle map driving around .. wot it was still doing exact same thing it just showed lower mph from speedo calibration but rpm was about same..


tires are 265/30/19

[mecanicman]

I'll post a file with changes after 7pm mst tonight.

[strokedcoupe]

ok thank you!

[mecanicman]

Give this a try. Let me know.

[strokedcoupe]

same thing man.. I looked over file and ive had this setup in there before.. made no difference .. I went ahead and loaded and logged just for giggles... but as you see 7000 as usual.. thanks for trying though

[mecanicman]

You have a gps? Do 60mph by the speedo in hpt and see what the gps reads.

[strokedcoupe]

gps, factory speedo which is driven off wheel sensors and scanned are all 60mph dead on... im totally stumped on this..
reading another recent thread someone having same issue with theirs on 2>1 downshift then it goes into limiter on 1>2 upshift just like mine.. which is basically mine is doing... he says his shifts fine if you leave in first.. I have noticed a few times mine shifted as supposed to but I may have be slow enough to already have dropped in first by itself.. its useless to leave in first for these test as car is stupid on street tires and im trying to find a wheel offset I can run to get some drag radials on it.. has 265/30/19 now and they make nothing that will fit my car in a 19

I have a question about the mph deal... if the computer only knows what you have told it mph wise in the calibration off of vss and what mph and rpm to shift at what does it change with different tire size ? I know it does something because I have put a different size tire on at the track one day on a Camaro and it started going into limiter on 1/2 change but I never understood why or how it knows the tire size changed

[Ranger6202]

if the computer only knows what you have told it mph wise in the calibration off of vss and what mph and rpm to shift at what does it change with different tire size ?

Your pulses per mile change, thus changing your MPH. I just helped someone else with there speedo issue, and so i'll post the same pic here i built for them.
Speedo visual.jpg

[Ranger6202]

are you using the stock gear selector switch on the side of the trans? Seems to be acting like its in D2 3rd gear settings. Maybe add System>PRNDL status to your scan? Noticed you're using a 5.3 OS, Are you using the 5.3 harness too, or the 6.0 harness?

[strokedcoupe]

its 5.3 harness also.. and yes stock selector .. and have logged before it shows correct D4 when im in od for the problems.. it does same thing when in D3 also.. as far as your other post I had a pretty good understanding of the pulses and which one did what.. I have tried manipulating those settings in every way to get a different shift point in either direction and nothing seems to change that. it is always about same rpm and same real mph..

[strokedcoupe]

update!!! had a 1999 Silverado ecu since build... i loaded 2000 Camaro os in it and it shifts lil late but never has hit rev limit again... idk what would be different but it works