I've got a Delta temp gauge on order from Mach V that will show incoming, outgoing, and Delta temps. I intend to install this to get some numbers and will be happy to report back when I've got some data. I'm a little concerned about the lead lengths but I'll figure it out. Intercoolers are high on my list of next things to do and I'll likely be using Mark's intercoolers though not the uber thick ones. I'll keep my ducts fully functional for sure and would love to put my intakes in the fenders eventually too as I hate the lengthy MAF piping!

I'm thinking I'll put the temp probes on either side of an intercooler core but wonder if placing one just before the TB and one just before the MAF to obtain overall temp performance might be interesting. I could perhaps place one just after a turbo outlet too. I've not yet gotten a good look at the probes but I'm hopeful they're small enough to give me options. If I could figure out a good way to switch multipl sets of probes I'd consider that too.

 

It's no guess work with Porsche when it comes to placing the IC intake like they did, it's a pressure zone.. With all I seen a increase of the ducts in the quarter panels would give huge benefits... They did back to back tests on the Manthey ducts and they were very successful as I understand!!

I will do something similar on my car will get back with the results, I'm running the gt2rs now and they heat-soak after a couple of laps.. Huge IC maybe good on a strip-car but for a race or track car you don't want that extra weight and the ducts on top and bellow is much more important in my opinion so you force air thru the cell package..

 

Ics must not only cool but also flow- temps alone will tell the whole story.

 

They also act as heat sinks, if they don't get a chance to release heat they eventually soak - some of that heat goes into the intake air when you're off the throttle too. The GT2 still uses plastic end tanks and only a slightly larger core, yes? I honestly have never thought they were a worthwhile upgrade candidate compared to many of the aftermarket units. Definitely going to keep my ducts intact and sealed when I upgrade though!

 

On a street car maybe you don´t want to change the appearance of the car.. So your point in that case is my point as well..
But with extremely large aluminium IC-coolers they work well in short pulls like a "Boulevard racing " scenario or a quarter mile..
Doing tracking or racing a IC cooler like that is way to heavy and also builds heat like a brake disc with no possibility to get rid of that extra heat in the long term..... Airflow ducts forcing the air the correct way is a must to keep temperatures down in the long term..

There are many tests that prove that the mk2/GT2Rs IC is quite much better then the old ones(see attached picture).

RS tuning tried a big Marston MS cores IC setup compared to what the result of big pod IC intakes did.. this was his comment afterwards...
"They were particularly interested in testing my car since it had similar intercoolers and similar engine specification (boost pressure etc) and they found that in 30C heat in 4th gear airflow (ie sub 130mph) my IATs were getting up to 60C whereas the race car in same sort of conditions with its big pods was getting no higher than 40C. "

 

Pictures of the RS tuning 996TT wider ducts and the Racecar big Pod intakes..

 

The newer ICs are certainly better than the older ones but I'd argue that a well built aftermarket is better still. Ducting is important no matter the size particularly for a car that's used for more than short bursts. The IC does indeed act like a brake disc no matter it's size with a larger mass being able to absorb more heat before soaking, all of them need a chance to release the heat. Even whether or not it's got an emissive coating makes a difference although most tests I've seen of that were a little simplistic - darker colored intercoolers seemed to work best. There's obviously a point of diminishing returns regarding mass and better ducting is.... better! Intercoolers seem to act like capacitors absorbing heat and then releasing when conditions allow, having enough ducting to allow them continuous use as in say a race condition is more than most of us are able to run on a street car. It's interesting to see efforts to improve that for sure for those that need it!

 

Might as well throw my .02 into the mix

Hardly feasible on a street car, but this is a dedicated purpose built race GT2. We had to relocate the headers, turbos, and intercoolers. Tub the rear to make room for the full RSR wheel/tire sizes, uprights, subframe, etc. We knew we needed bigger IC's but there's not a whole lot of room back there. Our solution was to channel the IC air flow with much larger surface area ducts just in front of the rear wheels (kind of like on the new 918). The air channel is massive leading back to the IC's. The intake is indeed in an extreme high pressure zone. The stock tail lights were gutted and now form the cover with simple push pin locks to allow easy access to the tops of the IC's to keep them clean from tire clag which is always an issue. We wired in simple LED lights into the tail light shells to provide legal (race sanction) brake lights. Then of course we had to plumb a new path to get fresh (and cold) air into the turbos themselves. We constructed an air box that holds two drop in KN filters ducted to the rear quarter windows (NACA ducts). Easy access for the filters too since our back glass (lexan) is held in place with quarter turn locks. Not saying this is better, or worse or whatever, just the solutions we are incorporating into our GT2 race car build. Cheers, John

 

Left out one point…

The low pressure side (under the IC's) is in fact what draws the air through the IC's. Underneath the IC's will remain open to enhance this negative pressure zone.

 

Aside from running a bolt-on more efficient core, has anyone considered running a CO2 sprayer to battle heat soak, or meth/water injection to cool intake temps?

Wagner Tuning makes a bolt on kit with more efficient cores, end tanks, and it comes with silicone hoses. SamboTT can get you a kit.

 

I agree, of course you can build a aftermarket piece thats better then a GT2RS IC, much better... But most installations I see has really crapy ducting and sometimes air intakes on top.. Me dont like! ;-)

Its all about a combination of all parts. My solution for 2015 on my racecar is big pods combined with GT2RS IC.. I´ll get back on the results! :-)

 

Water/Meth injection is pretty common and works really well.
I dont like it because its a "limited resource".. I dont want to run out of it in the middle of a race on max boost... But still consider it because it works! :-)

 

One might think that it's done to increase underpressure in the outlet, ie more vacuum and thus flow cooling through ICs.

 

I've just looked up those Wagner Engineering intercoolers, very nicely priced and they seem to address quite a few shortcomings! I need to research a bit more but they sound like they drop in the stock frames without modification. If so they're no thicker than stock and likely don't have the same capacity as say Mark's. Almost certainly better than the GT2 OEM setup I'd bet so perhaps a good interim setup for many. Reviews seem positive and they've got 2.5inch piping included. Personally I think I'd prefer thicker and am willing to mod ducting to fit that - carefully.

So far as those who place intakes in with the intercoolers - I think that's a terrific idea so long as the duct remains sealed. This means dumping the FEET of intake piping mess and going MAFless, nothing but win in my book. A blow-thru MAF might be even better assuming no restriction and tuning that could accommodate :-)

The factory did many things well but some things poorly IMO so I'm willing to make changes. I appreciate the Wagners being pointed out, food for thought for sure and look like good bang for the buck. I'm unwilling to make major bodywork mods in this area and will work with what I've got for now. Good discussion on what the factory has done for sure!

 

I have the wagner ic. I run meth too.

The way I looked at it was ic don't cool as well as meth, these cool better than stock but flow way way better. No factory fittings that neck down.

I made 690 rwhp. So they're good for me.