I had the old design headers (same for K16 and K24), are the ones that merge one collector tube to the flange. The new version have different collector and make power. Look closely and you will see:

Old



New



here is de difference at EVO/IA dyno, compare S2 and S3:



I hope it helps

 

they look nice, I have a feeling my turbo is too low for those. do they hang lower than the the stock? I think there was a few that had problem with the headers bottoming out. if they are the same ones.

 

Well, yes and that is the reason because I needed to change my old headers, I did slam one ..... today, I take the Cayenne when I have to go out of town.

 

mmm.....boohhkay, well such goes the mods. in the end it's just money and time. as long as you enjoy it.

 

The stock TT IC's will not, I repeat will not sufficiently cool the air for a stage 4 TT. You WILL get heat soak. You WILL eventually damage your turbos and engine. It is not a performance/hp issue (although when my friend swapped out his stock IC's and hoses for my old GT2 IC's and silicone boost hoses he claimed there was less lag, according to his butt dyno).

I forgot to mention that in addition to Kaspar, Knighton, and the local Porsche mechs, Rob King also stated that the stock TT IC's would result in heat soak on a 500 whp/K24 TT.

 

You of course mean ICs as headers do not cool squat. BTW where is your data to support this?

 

Fixed...Ask Stephen, I think he has some data on this issue. However, it is just basic common sense: You have a lot more air flowing in and out you will need a lot more cooling.

Why does Porsche use a bigger IC (GT2/X50) with the K 24's than it does w/ the K 16's?

It seems I am wasting my breath trying to save this guys engine/turbos so good luck to you all.

 

I agree with Dr. Jitsu on this one.
Why wouldn't better than the measly stock intercoolers be advised
on a Stage 4 K-24 car? In other words: what would Porsche suggest
using their K-24 turbos and running higher boost? At a minimum I would think
one would want the GT2 IC's, especially since everyone that sells them sells
them so cheap.

MK

 

for turbo's, exhaust gases are much better flowing when maintaining the heat from combustion. you get better performance if you are able to maintain the heat in the headers.

 

I would say that if you are street driving your car, just get the gt2/X50 intercoolers and call it a day. They are already 25% bigger and more efficient.

I think the reason Porsche used K24s and larger intercoolers on the GT2/X50/TurboS cars while running little more boost (.1 BAR) has to more with overall efficiency on the track. The K24s push much cooler air and the larger intercoolers add to the efficiency. This combination makes for the most effective track combination at the expense of a little lag due to larger turbos and intercoolers.

If you are driving your stage 4 car on the street only, you simply can not begin to duplicate the heat produced by a stock car running lap after lap on a tight road course at high ambient temperatures.

My opinion is get factory K24 ICs and be done with it. Now if you plan on tracking your car, aftermarket ICs start to make more sense.

 

I thought they were only 10% bigger and even that was debatable (only slightly larger fins, no difference in tubes).

 

I doubt they are even 10 percent more like 5 maybe. just longer cooling fins not even .100" difference same amount of internal surface area from what I can tell.

I have k24/26 turbos and run them at the track in summer heat at BW and WS and have never experienced heat soak at the track.

 

The offical PCNA number was 5% more efficent.

 

Thanks Doc,

Any other thoughts on the subject, IE when to do intercoolers
(I am doing Proto's Custom ones right now) ??

MK

 

Guys, I think the debate about ICs is good, but in answering the original question and follow-up by Pierre...ICs have no effect on lag. They cool the air going into the turbos, thus providing more dense air leading to more potential power. Whether the GT2 or EVO ICs do this better than stock (given Pierre's driving environment) is of course debatable...whether they are worth the money...once again debatable. My advice Pierre is given your initial question and follow-up...ICs will not be worth it. You do not track your car and the temperature is like San Diego...I doubt you get anywhere near heat soak...Save your money for other mods...