Advantages Of 100mm And 70mm Intercooler?

[Styline GTR]

Just wondering if there is any difference to performance of Replacing the Stock 70mm GTR Intercooler with a thicker 100 mm cooler???

[vinnie32GTS4]

u'll have more lag as there is a greater volume with the 100mm cooler

[GTR-32U]

You will pick up a little more lag, more noticable in the lower gears...Standard GTR intercooler is a pretty good bit of gear.I highly doubt there would be any power increase at all..Unfortunately this is a trend here in Sydney..Guys putting the biggest intercooler they can fit, cutting away half the front bar etc....pointless unless you got the monster turbo and tune to go with it...Little do they realise that if they actually fitted a more practical sized IC the car would boost up faster

[R31Nismoid]

What setup?

Much below 350awkw there really isnt much of a need IMO.

[rev210]

waste of money with what you have. The stock GTR intercooler is a pretty good bit of kit.

[W0rp3D]

out of interest have there been any tests done that compare a smaller thicker core to a bigger thinner core?

[Bumblebee]

What setup?

Much below 350awkw there really isnt much of a need IMO.

this is probably the only time ill agree with u.

Stock cooler is an awesome piece of kit.. mine mad a max of 296awkw with the stock cooler.. no problems at all

[rev210]

this is probably the only time ill agree with u.

Stock cooler is an awesome piece of kit.. mine mad a max of 296awkw with the stock cooler.. no problems at all

No if you agree with him you should never point it out or admit to it.

[Bumblebee]

hahah why not??? im too old to hold grudges dude

Always better to agree on one thing than to argue on everything

[Styline GTR]

Hey thanks for the advice Guys!!! looks like a 100mm is not the go!! Might have to Just upgrade to a New Stock Cooler!!!

[GeeTR]

u'll have more lag as there is a greater volume with the 100mm cooler

You will pick up a little more lag, more noticeable in the lower gears...

Hrrmm, I've always felt it increases throttle response, not so much "lag" I don't know anyone who's felt a bigger core / pipes increase the RPM point where the turbo goes positive pressure. Maybe my naive understanding of "lag"

You'd think even a stock'ish GTR ingesting 400hp worth of air is going to fill that slightly bigger core pretty quickly, but alas it does affect throttle response. Ie, when your past the positive pressure RPM point, (say 4500rpm) and you get off / on / off the throttle. A good mate with an 430hp EJ20T noticed a fair wack of increased throttle response when going from stock top mount Air -> Water IC to a Plasma-Man front mount, and another 380hp EJ mate when replacing the stock Air -> Air top mount with 4" thick item. In these specific examples (back to back, nothing else changed) response, not compressor lag was effected.

out of interest have there been any tests done that compare a smaller thicker core to a bigger thinner core?

Not any proper comprehensive ones that I've seen around. Fast acting pressure and temp senders before and after IC. Ambient temp, wheel speed senders and TPS logged by a decent logging box would be a damm good start. But who's going to find the time and effort to do that....? [Jaded Warning] LoL rem magazines and shiny alloy are the prime decider's for most ppls mods, not fact and data.

[Adriano]

Your 99% right, and are going by the common misconception of "lag". Lag is the response in a throttle off/on situation above boost threashold. Boost threshold is rpm based, and will not be effected by a larger intercooler. As such, lag cannot be compared on a dyno graph.

[GeeTR]

Ahh I see Obi Wan Im mixing using throttle response, instead of lag, and lag as the boost threshold.

Using my proposed test setup, you should be able to measure the time to full boost in the plenum after throttle off / on.

On a dyno you could get stupid and run a stepper motor on the butterflies; run the same "right foot simulation" program with two different IC's and check the boost response time. It could get silly hahaha.

Edited April 13, 2008 by GeeTR

[Adriano]

Alternatively you could do 2 power runs, one with a slow ramp rate, the other with a fast ramp rate, the lag would show as a difference in the boost threashold, but the power graphs would be useless

[700HP-GTR33]

In my opinion........

A larger cooler....decreases air temp. and thus feeding colder air into the chamber.

The colder the temp. the better the the explosion and the greater the power.

There are 3 things you can do on a GTR to unlock its power...and they are all about air-flow.

Increase intake pipe sizes to the inter-cooler...increase inter-cooler size.....and last increase exhaust size/including cat.

These three on a power to $ ratio increase the power more than any other mod.

Most GTR's that are imported to Australia already have these three changed...so you cannot overlook this.

Yes I agree with many.....in saying the GTR's FMIC is great as it is.

But you cannot overlook my statement.

If you are changing the cooler....go larger.

There are plenty on the market that bolt directly up.

[Beer Baron]

Just wondering if there is any difference to performance of Replacing the Stock 70mm GTR Intercooler with a thicker 100 mm cooler???

well for starters the stock GTR core is only 60mm. so replacing it with a good quality 70mm core will be of some benefit. going to a 100mm core is a big jump up in size so unless you are making the sme kind of jump with turbo size etc I would not bother. plus it's a lot of extra weight hanging over the nose of your GTR that you just don't need.

[GUN_METAL_GTR32]

a mate of mine had a vspec 32 gtr with a custom to4z 370kw and a dog box and he retained the standard cooler.

u pretty much dont ever need to chane one.

he even kept the standard fuel pump after trying a bocsh for a bit then went back to the stocky

spend ur money else where imo

[djr81]

Far be it for me to be a dissenting voice, but a bigger cooler has its advantages on a hot day on the track.

You suffer appreciably less heat soak with a larger unit.

Whether this is worth the extra weight, cost and throttle lag is another story.

[**RB2530**]

I can't see how a bigger I/C can introduce noticable lag...Yes there is more volume in the I/C but if you look at the flow rate of air going into the engine veresus the increase in I/C volume (might work this out...give me 4 hours) I wouls say the time taken to fill the extra volume in the I/C would be very small....

The test for whether or not the I/C is big enough is what temperature is it cooling the inlet air to...Basically the cooler the air, the better...But at best, an air to air I/C cannot cool the inlet below ambient temperature....So if you check you inlet air temp on a 25deg day and it is actually 25 deg, the existing I/C is big enough...If it is measuring 50 deg, there is room for improvement...At the moment my cars intake setup (600x300x76) at 60% load has only a 4-5 deg temp increase from ambient temp to throttlebody...

This is a funtion of the I/C but also the entire intake setup...I could go a thicker core and get that down to a 2-3 deg temp increase, gain more power, but probably not much more and the cost of gettign a bigger core in there would be high...Cost vs benefit not high enough..

And just one extra point..I hear it many times that car-x makes y-kWs with standard set up already so there is 'no point in doing mods'...This is a risky statement and often just not true....In reailty you can't make that statement without first either, doing the mods and measuring no benefit OR understanding the science and taking real life measurements then drawing the conclusion that it is not worth it...

Not having a go at anyone, just bored at work and filling in time...

[**RB2530**]

Far be it for me to be a dissenting voice, but a bigger cooler has its advantages on a hot day on the track.

You suffer appreciably less heat soak with a larger unit.

Whether this is worth the extra weight, cost and throttle lag is another story.

+1 from me...

Heat soak is another issue...Larger coolers have a larger thermal mass due to more aluminium so they will run cooler...