i want to change os

[Mr Drescher]

I have 12216125 and would like to run 12212156 for cos

[ScarabEpic22]

Find appropriate base file, full flash stock OS, full flash COS, cal flash stock OS, read out as base tune. Copy your tune changes over to the new base file, cal flash.

[Mr Drescher]

Find appropriate base file, full flash stock OS, full flash COS, cal flash stock OS, read out as base tune. Copy your tune changes over to the new base file, cal flash.

Where can i find the base tune?

[joecar]

What year/model/vehicle do you have...?

If you're stock, you may have to create the base tune by copying over the important tables.

If you're modded, you can create a script of your changes wrt to stock, and run this script on top of 12212156.

[Mr Drescher]

What year/model/vehicle do you have...?

If you're stock, you may have to create the base tune by copying over the important tables.

If you're modded, you can create a script of your changes wrt to stock, and run this script on top of 12212156.

It is from a 2002 tahoe
Swaped in to a z31

[Taz]

...Swaped in to a z31 ...

You are referring to a Nissan 300ZX ?

[Mr Drescher]

Yes its a 84 50th anniversary edition 300ZX