Switching Turbos, tune OK?

[QuickSpoolSR]

So I am switching from a Tomei m7960 to a garret gtx2867.

My question: how far will my tune be off. I am not changing anything elese:

s14sr20det
bc 264/264 cams
750cc inj
z32 maf

what should I expect to be off about the tune?

I am trying to hold off getting it redone right now because I want to do the e85 switch but I need to get a few more things lined up first.

[koukistylejdm]

it shouldnt change anything... you may want to lower the boost a pound or 2 just to make sure or just pay attention to your wideband first time you rip it

[240sxfan6882]

It won't be "off" really.
The MAF will compensate the change of air difference from the new turbo.
However, a re-tune for that turbo will most likely optimize the power curve for it's given size.

I went from a t3/t4 on my KA24DE to a GTX2867r and there's no difference in the way the car drives on an enthalpy tune.

[QuickSpoolSR]

wow that is Awesome news, thanks for the info!

[jr_ss]

Get it retuned, why risk it?

[Z28ricer]

Get it retuned, why risk it?


Because there isn't much risk if any at all, a 2867 vs a 20G (68mm exducer), sure going from a GT2560 -> 2871 big difference, but here the two turbos are very close to each other.