Hey

I have a 22"x6"x3" with 2.5" inlets intercooler on my boosted ITR at the moment with a t3/t4 57 trim on 10 psi. Im just wondering whether changing the intercooler to a larger one (26"x11"x3" with 3" inlets) make my car lag? and would i need to re-tune?

In a few months im hoping to run more boost, but i have the bumper off the car at the moment and so i can get get the larger intercooler on now.

Your advice would be appreciated.

Cheers

 

ud need a retune,,but if ur piping stays 2.5inch then i dont think it would have more lag than wat it has now,jus retune wen u go mor boost,save cash,recession-it affects everyone sometime

 

Since there is more volume to fill from the turbo to the throttle body, there will inevitably be more 'lag' but you may not notice it. You will need a retune unless you're confident that your first tune was rather conservative. If this was my setup, i would hold off on the intercooler install until you're ready to retune on more boost...theres no point to tune again just to change an IC where you stand to gain nothing at the moment. Be patient...

 

so bigger intercooler = more lag? wow i learn something new everyday

 

It's not that cut & dry. The larger intercooler causes a slightly higher pressure drop, meaning that it takes a slight bit more boost to make up for the drop in pressure from the larger area of the intercooler. (remember, an intercooler is basically a heat exchanger).

Now, depending upon the turbocharger used, that increase in boost might cause you to "lag" (in the technical definition of the word) a little, but more than likely it is not noticeable as stated.

It depends upon what turbocharger you're using.

 

You will definately not feel it on the butt-dyno and it will be hard to notice on an actual dyno. Just to be safe I would have the tuner take a look at the tune to make sure its still safe.