All Things Mk5 > Performance Modifications
Take it easy before the remap?
pudding:
I got a 6R intercooler for £250 from a dealer, inc VAT. Versus £550ish for the older all alloy one, which is still available, but will probably be obsoleted soon.
The thing with me - which I know goes against the grain with a lot of people - is I trust the car maker more than aftermarket tuners. If VAG felt it was fine to drop the alloy ends and still produce the same power, then it's also fine by me. Don't forget the newer S3 and Golf 7R make 300+ on the same plastic ended intercooler. And also remember the intercooler is partially obscured by the a/c condenser and bumper, so it's surface area is not 100% exposed to the airflow.
You only have to do your own data logging of the IAT sensor to see what happens in the real world. When idling, the IAT temps soar very quickly. Is this heat soak? No it isn't. This is a compromise from fitting the IAT sensor so close to the intake valves and downstream of the (closed) throttle plate. Combustion reversion quickly heats the sensor up and is a false reading. As soon as you open the throttle, the airflow cools the sensor down immediately and you get a true reading again.
Where you will see heat soak is on hard WOT pulls at 5000rpm and above. If the temps rise rapidly here and the recovery is also very slow after coming off the gas, you need a better intercooler. I have done this analysis on my Stage 1 eddy both in summer and winter and the 6R intercooler is more than up to the job for a road car :happy2: Track work puts a bigger demand on the intercooler, but it's always a compromise between increased lag, cost and ease of fitment.
Shoduchi:
@Pudding The MQB platform uses a different IC from our platform. Do you know if there are any differences in size between them? Not sure if it's correct to compare both ICs.
I also prefer OEM parts in most occasions but I know some aftermarket companies make better parts than OEM. I think it's still possible to source an alloy ended S3 IC for less than £550 from Germany. An used item in good condition would also perform well.
Even with a big IC I'm sure the GFB DV+ reduces lag a lot when doing multiple accelerations. But I agree that on the 1st WOT the lag will be bigger with a bigger IC. :smiley:
pudding:
Sorry, I meant the 7R/S3 uses the same construction method and materials as the 6R - i.e. plastic ends, not that the 6R & 7R ICs are exactly the same. My point was if VAG felt that alloy ends were critical to cooling performance through extensive testing, they would use them, as they once did in the early 8P S3. Obviously there are cost savings to made using plastic and crimping rather than welding, but OEs always arrive at the best performance / cost compromise.
I just go by dealer prices for consistency & convenience, but yep, obviously things can be sourced cheaper if you shop around :)
Agreed. If I went aftermarket it would probably be a Wagner intercooler, if it could be clearly shown my 6R one is holding back the party :)
Shoduchi:
Agree. You made the reasonable choice for your needs. Just who wants to reach the top power of a stage 2+ needs to source the best performance parts, which comes with a bigger price tag (or more modifications to the front end to fit a Welly cooler, for example).
I know my IC isn't the best available in the market but so far it hasn't been an issue performance wise with my current tune. I haven't seen a worrying IAT during hot days in the Summer (even when the exterior temperature is near 40ºC). It cost me £360 + £60 for the bigger silicone pipes. With better fuel my tuner could make it more aggressive and request more boost from the turbo, which would increase the IAT.
pudding:
I think that is the key to it personally - building for purpose. I'm seeing more and more Stage 2 and 2+ people blowing engines and turbos on the facebook group, so what you said there about requesting too much boost is spot on. I don't get it personally. Even 350hp is pushing it on these engines and is VERY fast for a GTI road car, but people want 400, and it's just not sustainable with a K04. Something has to give. It's better to run a TTE420 at lower boost and make the power far more efficiently instead of spinning a K04 way out of it's efficiency zone. All it's doing is baking the intercooler and destroying it's thrust bearings.
Anyway, I digress. I'm glad you are happy with your setup :happy2:
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