If an intercooler reduces air charge temperatures, and IATs climb as engine load and RPMs climb, why is peak horsepower gained occur in the middle of the powerband?

 

with short runs like this the extra power gained is probably more due to better flow and less pressure loss than AIT improvement in the middle of the curve. Just a guess

 

Echoing Prche951's comments... greater flow could (should?) also yield earlier spool/boost onset, with gains everywhere under the curve but also moving the power curve to the left. Boost hitting earlier may equal +40 whp gain for a given rpm, if you pick the data point with the greatest delta pre- and post-install.

 

The 997 GT2 RS intercoolers can be purchased for under $1000 from the dealer for the pair. Not sure why they are ripping you off to the tune of $1240. I run these at the track and they work very well at an altitude of 5000+ feet running on a car at 1.2bar for 20+ min sessions in ambient track temps of 120F+. Performance wise, I can tell no diffence at the beginning or end of the session with my IATs in the 130s on the hottest days...

 

I am struggling with my Intercooler decision.... I read of the benefits of Forge and 997 GT/RS. In my application I want to make a choice that positively affects my driving experiance overall. Our car is driven in So Cal and the desert where temps are 90-100 degrees often. I am not drag racing the car, I want maximum available performance at all times given the conditions to include long drives in the heat and stop and go driving in the heat on 91 octane fuel. I have run 100 racing fuel and already know the benefits as they were immediately apparent that the computer allowed more timing for the boost. I am trying to replicate that by cooling the IAT's and run 91 octane and keep the computer from pulling timing.

It seems to me that the Forge flows better which yields the claimed increase in power. But can the Forge keep the IAT's low like the 997 to maintain maximum available power in the heat? I am thinking that overall the best compromise is an intercooler that keeps the IAT's lowest to allow the computer to keep the timing in as the benefits of better flow are lost once the computer starts pulling timing.

OK, after all that said, what are your thoughts? 997 or aftermarket like Forge?

 

Normally I would stay out of vendor product intros, but I guess it was posted in the open forum...

One cooler has been independently tested and logged by owners on over 10 cars, several of which were being flogged on road courses (one being the Nurburgring), some going to over 200mph. All show temps being held within 30C of ambient at up to 1.55 bar. Usually even better with lower boost.

The other has a dyno.

Look at my location.

If you can get a guarantee that temps will be equal or lower than .2s or your money back + install costs, go for it.

Any yes, you are absolutely correct, in the long run tiered timing cuts with higher IATs will kill power tenfold over a small increase in pressure drop. Talk to sir996ttalot and the Bruntingthorpe crew about this one.

 

The other has been independantly dynoed, been ran at over 900whp, been ran ot over 2.0bar of boost.

the 997.2 unit can not do that - period. It will blow apart the lower end tanks at anything close to that boost level - it has happenned to people here more then once to some..... because it just cant flow enough throught the core. the lower IC hoses will blow out of it at those levels too, which gets annoying quick.

OEM 997.2 units are definitely a huge upgrade over stock, economical and perfect for a lot of people's power goals but they can not take you to the moon.

 

Agreed..... I don't think Don Johnson or 90% of the others with mildly modded cars like him are looking to go to the moon and the 997.2 ICs are a proven solution for under $1K. For those looking to spruce up their space bound 996tts, the Forge coolers might just be the $2400 ticket to get them there....

 

proven up to a point. i would not use that unit over 1.6 bar on a upgraded turbo car.

 

I said they are a proven solution on MILDLY MODDED cars. Running 1.6 bar is not "mildly modded" in my book. Most people run 1.1-1.3 bars with mildly modded set ups. The GT2 RS that uses these coolers off the dealer floor runs at 620 hp at 1.5 bar so I guess 1.1-1.3 should pose no issue. Certainly no issues on my car being flogged at the track at 1.2 bar....

 

In mine it is

 

all thanks for the input. I am leaning towards 997.2 intercooler unless ECS/ Forge jumps in on this and makes a compelling argument towards their product for us mildly modded guys.

 

Hi,
I run the 997.2s for a moment in my 675hp/900Nm 997.1TT,
997.1 Ics were crap, logs showed no cooling efficiency at speeds, logs with 997.2's show far better cooling efficiency but I did back to back test on dyno and absolutely NO gain appeared before we retune. (using the better thermal capacities)
For now, I don't know better parts than those, but I'm sure their flowing is a bit poor and even by only 16°C AT after repeated runs as 100-200/300 IAT exceeds 50°C, wich is enough to provoc "time pulling", logs proven.

So, 997.2's are for sure far better than 996/7.1's, but if someone can demonstrate me he knows better ones I'm still pretty interested...

 

The advantage of the Forge Intercooler Kit is it can handle higher boosts levels for cars with more modifications done, they also allow for better air flow. The 997.2 kit is also very effective in it's own right at reducing temperatures, it really just can't handle high boost levels. We do offer both kits that are available for purchase and depending on your needs they can be equally effective.

For more information Click Here

 

HAs anyone logged any after market IC next to the 997.2s same day same car same conditions... I doubt it... most guys run them months apart or in different temps...
Im itching to do back top back tests same car same day... but then it will be XXX car which really doesn't mean anything because everyone has a different set up.
We have seen 1100whp on bar n plate ICs, 3 sec 60 to 130s.... and even 9 sec 1/4 mile times... not saying all bar n plate are same nor that they are superior to .2s on a flash and exhaust... just saying..
markski