Intercooler For R33

[Skyline_95GTS]

Hey Guys,

I have just bought my R33 RB25DET about 3 weeks ago and I want to put a front mount on there. I found a nice one that i want to put on there but i am not sure about the size becuase i heard too much air flow will cause my turbo to lag / take longer to spool.

My question is do you think it will be ok as the Core size is 4'' and the outlets are 4''. My car is stock, only mods are B.O.V, HKS air filter and 4.5'' catback exhaust.

Any help i can get on this topic will be much apperciated!!

Thanks guys!

[ProphetR33]

Why do you want 4" outlets? 3" is more than enough most kits come with 2.5" or 3.0".

Or shouldn't I be asking when you've got a 4.5" exhaust?

4" is overkill unless you've got a massive turbo. Its not about airflow that causes lag, what causes lag is the time it takes for your turbo to build pressure in your piping to your intercooler and plenum and the intercooler itself, so the bigger your piping, the more air your turbo needs to flow to build up that pressure.

Edited March 16, 2007 by ProphetR33

[Skyline_95GTS]

Well basically i asked my cousin what brands are good for intercoolers and he said he has a brand new hybrid one he can sell me for cost price but its got 4'' core and 4'' piping which is too big obviously... lol

That would have been perfect though coz the price was good and the intercooler is pretty big... hehe

Thanks for your answer mate!

[ProphetR33]

Well basically i asked my cousin what brands are good for intercoolers and he said he has a brand new hybrid one he can sell me for cost price but its got 4'' core and 4'' piping which is too big obviously... lol

That would have been perfect though coz the price was good and the intercooler is pretty big... hehe

Thanks for your answer mate!

If you're going to mod your car a fair amount then go for it.

If you're only going to mod it mildly, then I would go for smaller piping and core.

But hey if the price is right then take it, you may not even notice the extra lag over a smaller core, I'm just saying a core and outlets that big really isn't necessary.

[tridentt150v]

I'd be surprised if you had a 4.5" exhaust [as per prophetR33's comment, he was hinting that as well]. I would believe it if you had a 4.5" exhaust tip, but your exhaust piping would be more like 3".

And yes 3"is heaps unless your pumping out huge rwkw's with massive high end power aka drag racing.