Improving shifts via the ECM

[Redline Motorsports]

Call me crazy, but I think an easy way to get these tables in the ballpark really quick would be to log the torque estimate resulting from the coefficients (see post #1) during a WOT run that starts from very low RPM. Then you could compare the CALCULATED torque to a reasonable engine torque calculation from the dyno (corrected from wheel torque) and come up with a single rough correction factor at each RPM breakpoint.

Then, instead of multiplying the whole table by some unknown factor, you could have a series of RPM-specific corrections. Each one would be applied to its own RPM row and all of them would get applied in a single ECU flash.

Then just re-run the WOT pull and see how close you got it across the RPM band. Like he said earlier, you don't need to be precise, just "close enough". This should take a bunch of the guesswork out of the calibration process and speed things up by avoiding the mindless poking about of constantly trying different random correction factors across the board until it "feels right." You should be able to get close in one or two carefully measured corrections.

I wanted to create a correction factor PID to compare actual vs. commanded but there is a hard limit in the controller when you peg 640. Was going to use that against that table as a down and dirty tweak.


HT

[wesam]

So i should add 5% to all tables in the exhaust cam at 0 degrees ??

[HEKYEH]

I've made these changes to the E38 tune.......will see how it goes at the track on Sunday, weather permitting.

My issues has always been getting the 350-370rwkw thru the transmission and down to the ground. The 1-2-3 gear change was always soooooo "stuttery"....if that's a word?! Well it is now.

See what happens

[Tre-Cool]

A newish 2nd hand gear box makes a big difference. my original tranny was flogged out after 135K hard km's.

[ls1mike]

I have found if you have to bump the VE table a good bit then this table should not need much or any adjusting. Stock engines will need up to 20% bump to get a real firm shift, even with an additional 15% bump on the trans part throttle pressure settings.

[Rhino79]

VE table? The vve tables? or some of the tq model tables?

[ls1mike]

The "virtual" VE table. Basically airflow = power = firmness so OBV if the computer has a higher base airflow number you'll get higher output data.

[Boost]

OMG Tre-Cool, I almost shift myself

[restless@westnet.com.au]

HI
gmpx is it just the 0.0 left hand column that you rise by 15% or the whole table
i tried to to put in a WORD page shot of the left column highlighted but it says only jpg, jpeg, png, giff , doesent it except word doc ?
thanks

[joecar]

Take a screenshot instead: click Shift-PrtScrn, open MS Paint, paste, save as .png.