VXR8 ECU tuning and relearn-

[darren_r1]

read this and thought it might be of interest, no idea if its accurate ?

taken from http://www.vararam.com/G8-instuructions.pdf

http://www.vararam.com/g8.html

ECU tuning and relearn-
( The following procedure should be used if a custom tune or tuning device is not being used)
Disconnect the negative end of the battery cable for a full two hrs.
The computer in your vehicle needs to learn both high and low speed airflow.
Once you reconnect the battery cable ,drive the car normally for 20-30 miles then do some performance driving, it will take your ECU about 100-150 miles to fully learn this kit ,However, if you do not do or have time to do a complete relearn procedure by disconnecting the BAT it will still learn, it just takes longer.

[ringram]

Basically talking about the evil long term fuel trims. You can just ignore it if you like.
Though doing a ecu reset might help if afterwards the trims tend towards a lower value than before the mod.

[Bonnie and Clyde]

ringram said:

Basically talking about the evil long term fuel trims. You can just ignore it if you like.
Though doing a ecu reset might help if afterwards the trims tend towards a lower value than before the mod.

Could someone tell me what a long term fuel trim??

[Magic919]

Bonnie and Clyde said:

Could someone tell me what a long term fuel trim??

http://www.obd2crazy.com/techdata.html#ftrim

[Bonnie and Clyde]

Magic919 said:

Bonnie and Clyde said:

Could someone tell me what a long term fuel trim??

www.obd2crazy.com/techdata.html#ftrim

Magic the links not working

[Bonnie and Clyde]

I typed the addy in manually and read the link. I'm still non the wiser. Some thing i'll never understand. Thanks for you response anyway Magic

[Magic919]

You understand that the map controls how the car fuels the engine though, Mel. The LTFT is basically the car thinking it knows better and deviating from the map, say +6%. This might be entirely justified, if the car has changed somehow.

Richard thinks the car doing its own thing is the work of the devil and turns them off so the car just runs per the map. Fine if you monitor the car regularly. Wortec leave them on as Paul prefers to allow the car to adapt to things like an air filter getting a bit blocked.

[ringram]

Short term trims will sort out blocked filters etc. No need to let long term trims ruin a good tune.

[vxrphantom]

ringram said:

Short term trims will sort out blocked filters etc. No need to let long term trims ruin a good tune.

Change of Sbj.. Rich what is the delay with your clutch??

[Bonnie and Clyde]

Magic919 said:

You understand that the map controls how the car fuels the engine though, Mel. The LTFT is basically the car thinking it knows better and deviating from the map, say +6%. This might be entirely justified, if the car has changed somehow.

Richard thinks the car doing its own thing is the work of the devil and turns them off so the car just runs per the map. Fine if you monitor the car regularly. Wortec leave them on as Paul prefers to allow the car to adapt to things like an air filter getting a bit blocked.

Thanks Tony

[ringram]

vxrphantom said:

Change of Sbj.. Rich what is the delay with your clutch??

Fittment issues in simple terms. Though the resolution may require some actual gearbox work. Waiting for the details