Track temps with PCM

[BLUETA#1]

I pulled my post from another thread and started a new thread…..

Maybe I should start another tread…but this may be a weak point for the track. I am starting to track my car and the water temp is hitting 240 and triggering the warning light. I have a hunch that the PCM is making the car run hotter. I may run the car wight eh stock ECU next month for a baseline comparison. The car only had 700 miles on it so I am not on it hard at all. For example, I run 2:42's in my sleep in a 290 HP VW Golf R and I was running 2:38s in the car.

So what temps do you guys see?

[Steve M]

What are the ambient temps when it is doing this?

[BLUETA#1]

90 degrees and windy.

[Nine Ball]

I've tracked my '14 TA a few times with the stock PCM, and also recently with the Arrow PCM. No difference in max temps that I've found. Here is a screen shot from my last trip, grabbed from the video of my fastest lap that day. Temps were in the mid-80s outside, this lap was about 20 minutes into the session. Car is 100% stock other than the PCM that I recently added.

210 coolant
233 oil
89 IAT



Tony

[RedTanRT/10]

G4 w/venom ecu, real hot for me is 220. Last weekend in Spring Mountain NV, air temps 90. Track layout had 3 area's where you run in 2nd gear figured that's why I got to 220.

240 is real hot, Leave a/c on by accident? Draft another car for some time? Track have lot's of 2nd gear pulls? Those are all situations where I run hot. I don't think the ECU is contributing but who knows??

[G37Sam]

240 is real hot, Leave a/c on by accident?

Doesn't the ECU disconnect the A/C Compressor Clutch under full load?

[viper04]

Just wondering if anyone know the temp of the stock thermostat used in the GEN V?

[BLUETA#1]

OK…day 2. first off all…thanks to Mark….the car out of the box hauled ass. Nothing passed me today. I was running down the new GT3s, Mclarens, etc.

The ambit temperatue was 77 today and less humid. I hit 220 water, 200 oil and the IAT was 86….20 degrees less that the 106 I was seeing yesterday. I was short shifting at 5k and there are 2 areas with long (506 second) 2nd gear pulls. The fluid was up to snuff and the radiator was clear. As the car breaks in I will monitor it. My next session is in May.

[FLATOUT]

I also have not had any issue with the new ECU at the track and haven't heard of any issues from my customers at Viperexchange.

[mjorgensen]

Karl,

Glad I could help Saturday, always here for you, and what did I tell you about the MCS ;-) . There is not many miles on the car yet and with the added back pressure of the stock exhaust and the heat of the leaner running PCM may be a possible cause. I have reached out to a friend and will call you later today with any other ideas he may offer.

Thanks,

[BLUETA#1]

Great. The car was great under braking….no wiggle. I have slight under steer that I may want to address with camber. (The 16,17,18 complex is a bitch on the left front.)

I am at a 5 pound differential front to rear (rears lower) and the rears are not rolling over at all…not nearly as much as the fronts. Temp-wise I was within 12 degrees between the inside edge, middle and outside edge.

[allans]

Blue, Please confirm that your water temp was 20* HIGHER than your oil. Was this with temps stabilized? also can you can you share your HOT tire temps F & R ? Thank you. Allan

[BLUETA#1]

Nope….it was the opposite. Water: 240, oil 266. The next day the water was: 222 and the oil was in the 240s. I am thinking of going to a 5/50 for the track. At those temps, isn't s 0/50 too thin?

Karl

[XSnake]

Nope….it was the opposite. Water: 240, oil 266. The next day the water was: 222 and the oil was in the 240s. I am thinking of going to a 5/50 for the track. At those temps, isn't s 0/50 too thin?

Karl

You should be running 15/50 at the track

[lmcgrew79]

240 oil 220+coolant that was at mid ohio which runs half the course in 2nd gear, vir, ncm, and road atlanta was maxing at 233 oil.

[Steve M]

240 oil 220+coolant that was at mid ohio which runs half the course in 2nd gear, vir, ncm, and road atlanta was maxing at 233 oil.

15w50?

[BLUETA#1]

is 15/50 OK with stock oil filter for track?

[Steve-Indy]

To quote a high level insider: "The Viper engine LOVES Mobil 1 15W-50"

[Steve M]

To quote a high level insider: "The Viper engine LOVES Mobil 1 15W-50"

Pretty sure he's referring to this thread:

http://driveviper.com/forums/threads...filter-failure

[BLUETA#1]

Blue, Please confirm that your water temp was 20* HIGHER than your oil. Was this with temps stabilized? also can you can you share your HOT tire temps F & R ? Thank you. Allan

I ended up 36 F and 31 R cold. They heated up to 42 and 38 respectively. The rear showed no roll…not even close. The front was rolling over a bit. I am going to toe out the front a hair to deal with the long sweeping high speed curves at COTA. I forgot to write the temps down. I am confident that the rears were 128 outside and 142 inside. The fronts were about the same. The oil/water were consuming my attention.