I searched and couldnt figure out how to narrow the search down to answer this question. Anywho, I'm wondering...when doing a build, when is it necessary to upgrade your radiator? I can tell its already gonna be a rediculously hot summer so its crossing my mind that it may need to be factored into my build no matter which direction I choose?

 

If you dont track your car at all, and keep power levels around 500whp or less, the upgraded rad is not needed, but recommended. If you track your car even once a year, then definately do a thick core Koyo.

 

tons of guys go without it, including me. It will definitely help and If you got an extra $400-600, do it... but unless you're doing some major tracking I wouldn't say its really necessary.

 

Awesome that just answered what I needed. I'm planning on tracking the car every chance I get since I live 12 miles from the drag strip now.

 

^ without a doubt, I would do it. Also get an oil cooler as well.

 

Ok. Is the Stillen Oil Cooler the only one on the market? Also, Sharif, is the Koyo R series the thick one? The slim also says the core is twice as thick as stock, so which do you recommend for a car that is preparing to be built for 600hp and tracked alot?

 

R spec is the 3 row, and the V spec is the slimmer 2 row.

Drag racing doesnt put an immense amount of cooling load on your system. 10-12 seconds at WOT shouldnt tax your stock cooling system too much. Road course stuff is what I was referring to. If you plan on doing an track days, I would definately recommend the 3 row.

 

OK thanks. I think for the slight price difference the 3 row would be the better choice then just incase me and my friends do take a summer road trip to do some track events. They are sick of straight line running their subies. lol

 

Why not take it a step further? This is from a local guy who tracks heavily, I'm still waiting on pics/more details:

 

That sounds like a pocketbook killer. Anymore info on it?

 

Let me ask him and get back to ya'll.

 

okie, thanks

 

Here ya go:

http://chicagoz.com/v-web/bulletin/b...pic.php?t=7467

 

Nice thanks.

 

Too bad there are no direct bolt on radiators for the G. My coolant temps weren't a problem on the latest track day, but it was only about 50 degrees outside. I'd be a bit worried about a track day in 90 degree weather.

All the radiators on the market (that I know of) that say they are for the G are actually for the Z, and have inlet and outlets in the wrong spot. Oh well.

Dave

 

I would do the upgrade. I'm NA and I'm even considering it!

The reason is because I've seen on the dyno there is a strong correlation of HP and TQ to coolant temperatures. On the order of 12-18 HP between 185'F to 210'F coolant temperature.

I track my Z whenever time allows and weather its hot or cold outside, I've noticed coolant temperatures are always around 210'F while on the track.

So a good radiator is probably worth about 8-10HP on the track when NA.
If your FI.... there is no question it will benefit your setup.

 

The ecu has a equation to decrease ignition advance when coolant increases beyond ideal [174-195F] usually 1 degree per 5F limited to 5 degrees retard at 220F.

Part of summer overheat protection.

 

There is a direct bolt on aftermarket radiator for the G. SGP got Power to make one for them. Here's the link from G35driver.com.

http://g35driver.com/forums/showthread.php?t=128757

I hope this helps.

 

I recently installed the 3 row Koyo and after purging the system very good, my temp have not risen to the point were the fan comes on. I am at 185 - 190 all day long in humid 89 degree weather.

You can pick yours up a WWW.forgedperformance.com they always have some in stock, and have the best prices in town.

 

This was basically the same setup I had till it got stolen. C&R two row double pass closed system with a swirl pot.

Now I have the PWR unit that SGP sells.