Intercooler Sizing - 75mm Or 100mm Thick?

[Cubes]

Hi ppls,

I'm redoing my intercooler and will be buying a core (most likely from JJ) and then redo the piping myself.

I'll be running maybe a touch over 300rwkw on 18-20psi.

I'm looking at a cheapy intercooler thats 600x300x75 and runs 2.5" piping from JJ on Ebay.

There's another that is the same size 600x300 but is 100mm thick BUT runs 3" piping so I'd have to run a step down silicon connector as most of the JJ/Gktech kits do.

Is a 75mm thick cheapy intercooler sufficient for 500-550bhp or should I just grab the 100mm thick item?

I know of a few running the JJ/GkTech kits and they are pushing 300rwkw without problems BUT I believe its the 100mm thick core. Any one done those sort of power levels with the 75mm core?

[paulr33]

what throttle body size

what exhaust setup, turbo

logic woud say theres some form of ratio for exhaust/turbo size to intake size & compressor match

[SilverECR33]

go the hundred. .. If i were you, I would go the 100mm core.

[krzysiu]

Used to have a 90mm core. Go the 100

[BHDave]

I'm running a cheapy 75mm core for my 288rwkw. I think the 100mm will be a bit harder to mount behind the reo and keep stealth.

I've been thinking about the 100mm jj core with the better end tanks though as i think there will be some gain from the tanks if nothing else.

[paulr33]

if you are after the absolute best then go for a tube and fin, 90mm core and minimize the pipe work if you canb

but i would only be doing that if you can afford it, have the right plenum setup and the compressor isnt way out of its efficiency zone

make sure the end takes are smooth, curved and taped and not boxey or squared off.

http://www.are.com.au/techtalk/intecoolersMR.htm

plently of info, covers turbo lag, pressure drop maps, cfm flow for 2, 2.5, 2.6 and 3 litre setups and various cores, pipes and methodology behind intercooling

[tek_01]

definately go bigger than 75mm if going over 300rwkw

i was advised from a respected workshop that the jj/gtech etc 600x300x76 ones get a bit dicky up at around 300kw

[Cubes]

Paul,

Its a GT35r .82 running the xr6 .5 comp cover to pull up response from the big huffer.

----

Thanks for the heads up tek_01. I'll have a bit more of a look in to it.

[rb26s13]

hmm i guess im goin to have to see how far my 600x300x75 cheap chinese cooler will go hopefully manages to do 350rwkw allright if not guess i have to go bigger