Intercoolers...the Bigger, The Better!

[tezflow]

Hows it goin fellas, the time has come when i got enough cash to get a front mount for the 33. I was just about to buy a kit off the net until a mate reminded me about what our high school science teacher (a retired mechanical engineer who built HIMSELF a 10sec s2 rx7) once said... when it comes to intercoolers just get a truck cut, the bigger the core the better!

So does anyone agree or disagree? should i join our VLT brothers and get a nice big truckcut cooler???

[rb26s13]

as far as im concerned truck cores dont flow all that well compared to the intercoolers most of us put on our cars.. remember they are for a bit truck.. and they arent quite thing majority are around 50mm core thickness

[discopotato03]

Hows it goin fellas, the time has come when i got enough cash to get a front mount for the 33. I was just about to buy a kit off the net until a mate reminded me about what our high school science teacher (a retired mechanical engineer who built HIMSELF a 10sec s2 rx7) once said... when it comes to intercoolers just get a truck cut, the bigger the core the better!

So does anyone agree or disagree? should i join our VLT brothers and get a nice big truckcut cooler???

No I certainly DONT agree . Truck intercoolers use tubes with large passages for very high mass flow . If you look at OEM performance intercoolers used on cars such as the later Evo Lancers and the GTR's you'll see that the flat passages are not as deep as your typical Louisville core . From what I'm told the aim is to slow the charge air sufficiently so that enough time is availabe for the core material to absorb the heat in the air passing through it . The function of an intercooler is to transfer heat while posing the minimum flow restriction . If the air speed is too high through the IC's tubes it will not reject the heat generated by the compressor .

The design of the end collectors is also very important , you want the incoming air to easily access all the tubes and to be ducted into the outlet with the minimum constriction . Have a look at the IC chapter in Corky Bells book Maximum Boost , the diagrams should put you on the right track . Don't forget to leave some airflow for the engines radiator core .

Cheers A .

[paulr33]

yeah a truck core is bad. an ideal model would be a 450x60x300

that why its not a stupid truck / vl turbo 700x300x90 core which is just too big and youll have sucky throttle response.

[Munna1]

Truck cores are simply designed for that trucks as stated above the airflow characteristics are completely different e.g. truck revs to 4000rpm street car 7000rpm+.

Bigger is not always better, the bigger you the more throttle response you loose get a intercooler matched to you application if you don’t plan on upgrading the your stock turbo a R34 GTT intercooler is you best bet.

Read this page for more information

http://nissanskyline.6te.net/tuning_GTS25T.htm

cheers

[infected flow]

Truck cores are simply designed for that trucks as stated above the airflow characteristics are completely different e.g. truck revs to 4000rpm street car 7000rpm+.

Bigger is not always better, the bigger you the more throttle response you loose get a intercooler matched to you application if you don’t plan on upgrading the your stock turbo a R34 GTT intercooler is you best bet.

Read this page for more information

http://nissanskyline.6te.net/tuning_GTS25T.htm

cheers

I have an arc i/c for $1500..hahaha

[Fixxxer]

Discopotato is right on the money. I guess what you are looking for is a IC that is a compromise between its size and also it's efficiency (thermal and restriction) for a given application.

Look, you can buy cheap aftermarket car IC's everywhere these days that offer (well state) good thermal efficiency with low pressure losses. Gone are the days when a truck IC was the only cheap alternative.

Fixxxer

[mad082]

Truck cores are simply designed for that trucks as stated above the airflow characteristics are completely different e.g. truck revs to 4000rpm street car 7000rpm+.

not quite. depending on the truck will depend on how they rev, but most rev under 3000rpm. and most trucks are about 10L motor, and pump out HUGE amounts of air (the turbo's are huge) so the big tubes in a truck cooler are good for that amount of air, but not the tiny amount (in comparison) of air you are wanting to push.

the common size cooler for a r33 is 600x300. thats the size that the hybrid and most others come in.

Edited August 30, 2006 by mad082

[dan_the_man]

hmm wouldnt u just ask urself why none of the top hp gtr's use truck intercoolers?

[Beer Baron]

would you use truck tyres? or a truck steering wheel? no because those parts are clearly designed for a truck, not a high performance passenger car. the same is true for their intercoolers.