Does Bigger Intercooler = Retune Necessary

[MurdoK]

changing the cat without a tune will cause:

o2 sensor errors and,

will trick the ecu to think its not meeting emissions so changes the fuel mixture...for the worse.

Not to mention the risk of overboost due to free flowing exhaust.

that's my understanding of it. doesnt seem like good advice, unless im missing something

[SuckSqueezeBangBlow]

I had the tune done with ebay cooler but put in a plazmaman, same afr, no boost spike so I wont bother with a retune

[ZelchXR6T]

Thanks guys. Intreresting points from both sides. I might just be safe rather than sorry and wait untill I am ready to retune until I go bolting more performance parts on.

Cheers Henz, I didn't know that the dyno can overstate the power figures.

[discostig]

Dynos can vary massively, I've read of 30rwkw differences between dynos. Then each dyno can be fiddled with to produce different results back to back (moving the dyno's intake air temp sensor is the first one that comes to mind).

In short dyno's are good for tuning but unreliable for reporting power, run it down the 1/4 instead, it's more fun too