Had 2nd race of sophomore season in MWC ASR this past weekend at Blackhawk Farms.
Results were not good. 2nd race, 2nd DNF. Last year I had 11 races and 0 DNFs.
We had put in new clutch, rebuilt trans after first race DNF. Also had added Stoptech brakes.
It was 95 degrees outside and the car was at 260 degrees water temp and flashing warnings on the DIC after only 7 laps. The oil temp was up at 280, not critical, but higher than expected, especially since I have a cooler and generally run at 260 max. After having replaced a diff, clutch, and rebuilt a trans this year, I did not want to damage or blow the engine, so I pulled off / out of race Last year, we ran a race at 100 degrees outside temp with no problem.
We had a number of other problems all day including stupid stuff like showing up at grid without tech sticker attached, etc.
Practice and qualifying were mediocre. To some extent I'm re-learning the car after a winter of mods. Don't feel right in it yet.
When we rebuilt the trans we went with M6 ratios, which should be good in combo with the new 3.73 rear. It allows one to be in 2nd, near the top of the rev range rather than in 3rd, in some corners, and this was a big change.
On the positive side the T1 sway bars allowed very flat cornering, and the Stoptechs will allow me to do much later braking once I get my act together.
We (my 12 yr. old crew chief and I) figure that the hotter temps were due to more hp (LG G5X3 cam and headers) and maybe not having pure water/wetter (coolant still a little green from winter, even though we drained / replaced).
Will add a dual row rad and get back into it.
It was a shame because there was a good field including a 911GT3 from T1...
Bigger radiator should help, but some random thoughts that pop into my mind... did you run higher rpms with the new gearing? Did you retune your engine or is it possible your A/F mixture is off causing the car to run lean (I think that is hotter but maybe I have that backwards)?
Whose 911 was it? Jeff Amos or the guy from Chicago (can't think of his name to save my life)?
David- guy from Chicago (suburbs), owns a couple of auto dealers, really nice guy. Don't like to post peoples names on sites though....black 911 GT3, think its an 05.
Bigger radiator should help, but some random thoughts that pop into my mind... did you run higher rpms with the new gearing? Did you retune your engine or is it possible your A/F mixture is off causing the car to run lean (I think that is hotter but maybe I have that backwards)?
Yeah, my 12 yr.old crew chief is really getting pretty good. He can change pads, calipers, rotors, wheels, exhaust by himself. He was right with me every step of the way for cam, headers, clutch, trans, diff, etc. Half the time when there is an issue he's right and I'm wrong...
I am running higher r's in some corners, and yes I oly have a base tune, not a final tune, but the f/a ratios on the dyno sheets I have look toward the rich side, and car seems rich in terms of exhaust smell etc. Sure hope I'm not lean. I indeed need the final tune, but I have spent money on half a tune (long story told earlier) and a couple of dyno runs, so I have been delaying...
I'm going to do the tune, get the rad (leaning to a dual row DeWitts) and maybe go accusump soon. this years "budget" has become an outright spree...
More HP = more heat, so upgrading the radiator is pretty much mandatory. I would also look at the AFR - even slight aeration of the fuel-pickup in a corner (not detected on a dyno) will cause a drop in pressure and a lean situation.
Location of the oil cooler is also critical - any mounting behind the radiator will significantly hamper the efficiency, and providing an outlet for the dirty, hot air is just as important as getting cool, high-pressure air to the inlet of the cooler. Re-purposing the fog-light areas for ducting is good, as they are some of the highest pressure areas on the vehicle.
More HP = more heat, so upgrading the radiator is pretty much mandatory. I would also look at the AFR - even slight aeration of the fuel-pickup in a corner (not detected on a dyno) will cause a drop in pressure and a lean situation.
Location of the oil cooler is also critical - any mounting behind the radiator will significantly hamper the efficiency, and providing an outlet for the dirty, hot air is just as important as getting cool, high-pressure air to the inlet of the cooler. Re-purposing the fog-light areas for ducting is good, as they are some of the highest pressure areas on the vehicle.
-Bowtieman
My oil cooler is in front of the rad. I do intend on getting a new rad, thinking of DeWitts direct replacement. It is exactlly twice as thick, 2 rows, should be good, and it's about $200 cheaper than the Ron Davis and others out there.
Is there a way to use the space where the license plate cover is for ducting?
Any pics available on ducting in the areas you mention.
Ignoring any class rules that restrict ducting at the front of the car...
...sure, check out ducts up on pegasus racing, HRPWorld, etc. Depending on what is left underneath your fascia, there is room to mount the cooler underneath the crash-bar, in the center. Rather than simply presenting air in the vicinity of the cooler, create both an inlet and outlet plenum that seals to the cooler. A reasonable place to dump the dirty air is the front of either fender-well.
We built an offset inlet/outlet cooler duct from CF, that seals to the cooler. The fresh air source is the driver-side foglight opening, and the outlet hose dumps in the passenger side fender-well. Going cross-car satisfied some packaging constraints we had, but I'm sure other configurations could work just as well, especially if you aren't dealing with an undertray.
I neglected to point out that the placement of the cooler and ducting can make a significant, if not substantial difference in oil-temps. We've also determined that, in our case, any in-radiator cooler, regardless of manufacturer, is far inferior to an external cooler. In fact, in-radiator configurations have resulted in water-temp being "chased" by oil-temp.
hey aaron - what are competitive laptimes for asr at blackhawk or road america? i was supposed to make that race, but blew my motor on saturday during licensing . not sure how competitive my car will be, but it certainly felt good at blackhawk while it was running. will try to make the next race once the new motor is put in place. keep an eye out for a white m3 lightweight.
AutoForums.com is the premier network of enthusiast-owned
enthusiast-operated automotive communities.
We operate more than 100 automotive forums where our users consult peers for shopping information and advice, and share
experiences and opinions as a community.
Last year I had 11 races and 0 DNFs.
the engine, so I pulled off / out of race
Last year, we ran a race at 100 degrees outside temp with no problem. 
. not sure how competitive my car will be, but it certainly felt good at blackhawk while it was running. will try to make the next race once the new motor is put in place. keep an eye out for a white m3 lightweight.
Linear Mode
