All Things Mk5 > Performance Modifications

Intercooler thoughts

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Madone:
I am at stage 2 with the stock IC and obviously considering upgrading. However I have been logging the intake temp to get an idea of what is going on as things stand. Try as I might I can't seem to get the temp anywhere near the 50deg mark where the timing gets cut back by the ECU. The most I have seen is 48 after sitting in traffic for ages on a hot day, as soon as I started moving, even at 30mph, the temp dropped back to mid 20's when the ambient was 18 or so. Once is sped up a bit it dropped further.

I can see why this sort of thing would be a nightmare on a dyno, heat soak would be bad. But in real world driving I cannot drive the car hard enough for long enough to get the temps up. It's so fast I would either be in the verge or in the police station before getting a sustained high temps. I know some people use their cars at the track but the standard IC seems to be ok on the road. I would consider upgrading it, but the temps don't increase to the point where it's costing power.

It would obviously cook on a dyno but that's not real word scenario. What are people's thoughts ?

Dan_FR:
50 degrees?  Thought the ecu pulled back at a lower temp than that. High 30's? What software?

Lower temperature = denser air. More to power than just the ignition timing, also CF's will be higher meaning less actual ignition advance. Intercooler flow & (lack of) pressure drop are also vitally important.

I noticed a big difference upon fitting mine at stage 2, and I went with the cheap China THS copy.

Madone:
From airtech

Standard intercooler & Stock ECU Map – Intake temperature of 34 degrees @ 205.3bhp ‘this is completely acceptable and not bad for a stock car’.
Standard intercooler & Stage 1 Remap – Intake Temperature of 49 degrees! @ 237.1bhp ’49 degrees is the absolute limit before ECU starts retarding timing to keep the engine safe, which means you will start to lose power.
Airtec 2.0 TFSI intercooler upgrade & Stage 1 Remap – Intake Temperature of 31 degrees @ 249.5bhp ‘ Temp drop of 18 degrees & 12.8bhp Gain, compared to standard VAG intercooler!

duncatr:
I really need to log my car to give some feedback on this.

I'm running the standard intercooler on my mk2 Leon Cupra R (Same as the newerS3 with plastic end tanks)
Car is running APR map and making 360/360 on a dyno proven to be pretty acurate (so its not funny dyno figures)
CDL engine with APR HPFP, EVOMS intake, usual uprated clutch etc. And I'm actually still running the oe exhaust.

It certainly doesn't seem to pull too much timing so would appear to be pretty efficient.
Might be a good cheap upgrade. I know pleanty people that have used the S3 intercooler at good power although most seem to go for the alloy end tanks

Madone:

--- Quote from: duncatr on May 01, 2015, 01:40:58 pm ---I really need to log my car to give some feedback on this.

I'm running the standard intercooler on my mk2 Leon Cupra R (Same as the newerS3 with plastic end tanks)
Car is running APR map and making 360/360 on a dyno proven to be pretty acurate (so its not funny dyno figures)
CDL engine with APR HPFP, EVOMS intake, usual uprated clutch etc. And I'm actually still running the oe exhaust.

It certainly doesn't seem to pull too much timing so would appear to be pretty efficient.
Might be a good cheap upgrade. I know pleanty people that have used the S3 intercooler at good power although most seem to go for the alloy end tanks

--- End quote ---

It would def be really interesting to see what temps you get. I am really struggling with the reason to upgrade the IC when the temps indicate (in normal road use) it's just not needed. The irony is it seems the most important place to have a updated IC is on the dyno then after that you can't load he engine in the same way, repeated 4th gear pulls to the red line aren't something British roads and speed limits lend themselves too !

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