tigeo
Autocross Champion
- Location
- Richmond, VA area
Will be doing the Audi Club season finale at VIR in Nov...looking forward to my second event.
If you are tuned and tracking then increasing cooling headroom is necessary. My initial plan was not to add the add Aux radiator. But after going IS38 and tuning it. I figured overheating would be worse than I had on a low torque IS20. VW engineers added the Aux radiator for a reason on the R’s. Also decided to go with the larger capacity CSF Aux cooler vs. the OEM unit. It’s more than double the cost of the stock unit with maybe 25-30% more cooling capacity. Not sure if the CSF option is absolutely necessary.
I’m adding a 19-row Setrab oil cooler with a 185 F Improved Racing thermostat. I’ll will post both installs and parts lists. I will using the VWR adapter and oil filter.
I‘m hoping a combination of the coolant and oil cooler upgrades will help keep oil in the 255-260 range and coolant below 220.
View attachment 225533View attachment 225534
The past two events my typical speeds on the back / front straights are 135 / 131. There’s more in the car, but we intentionally kept boost low on the top end because my injector times are too high. I usually brake at the 1.5-2 marker on the back straight, since the braking zone is uphill, then heavy trail brake into roller coaster. On the front straight, I’m usually a little more conservative and brake at the 3 marker, and light trail brake to a late apex at T1.Hey Ronnie, Thanks!
Based on your testing, I’m confident that the cooling mods will be sufficient for a tuned IS38.
Really looking forward to VIR and getting the suspension dialed in. I hate that I changed so much all at once, but am excited at the same time. The car will be completely different with the additional power and LSD. Will need to back up my brake points and figure those all out again.
What Vmax are you getting on the back and front straight at VIR? Which brake markers are you using?
I usually brake at the 1.5-2 marker on the back straight, since the braking zone is uphill, then heavy trail brake into roller coaster.