Track Day Temps

[Steve M]

Remember though, at 240 degrees the PCM is already pulling timing. This will reduce power and slow you down.

To make matters worse in the power department, whenever it pulls timing it also adds fuel.

[Stealth]

If temperatures rise next time I will adjust driving style a bit to keep temps in the 230sF.

[ViperGeorge]

If temperatures rise next time I will adjust driving style a bit to keep temps in the 230sF.

I believe it is already pulling timing at that temp.

[Stealth]

OK, I will just leave it in the garage... .

[ViperGeorge]

OK, I will just leave it in the garage... .

I'm beginning to feel the same way. I need to figure this out for sure.

[Stealth]

Just to clarify: my car ran great at a HPDE in 85F+ and threw no error codes whatsoever; other cars were side-lined. Most of the time it was running 225-240F Oil Temp. When it hit hotter temps it was cooler a couple of turns later on the same lap. When I ran an earlier HPDE session in May 2015 with temps around 70F at the same track I hit 224F or so (I do not watch the gauges every second so it could have been slightly higher then). The first HPDE (1 day, 4 20 min sessions) was with OEM PCM. The second HPDE in the hotter ambient temps was the same duration but with the Arrow PCM. I am running 91 Pump Octane. I really attribute the higher temps to higher ambient temps and driving style.

Sitting in traffic in SoCal the car can hit 205+F. Normal cruising Oil Temp is 192F or so.

My feeling is that the car is great and running well. Very smooth idle no codes. My fluids are cycled regularly. At 4,200mi. I changed differential, tranny, brake, clutch and oil (about my 3rd oil and filter change).

That said, if there are simple changes I can make to make the car run even better and more safely, then I will certainly consider such matters.

[ViperGeorge]

Just to clarify: my car ran great at a HPDE in 85F+ and threw no error codes whatsoever; other cars were side-lined. Most of the time it was running 225-240F Oil Temp. When it hit hotter temps it was cooler a couple of turns later on the same lap. When I ran an earlier HPDE session in May 2015 with temps around 70F at the same track I hit 224F or so (I do not watch the gauges every second so it could have been slightly higher then). The first HPDE (1 day, 4 20 min sessions) was with OEM PCM. The second HPDE in the hotter ambient temps was the same duration but with the Arrow PCM. I am running 91 Pump Octane. I really attribute the higher temps to higher ambient temps and driving style.

Sitting in traffic in SoCal the car can hit 205+F. Normal cruising Oil Temp is 192F or so.

My feeling is that the car is great and running well. Very smooth idle no codes. My fluids are cycled regularly. At 4,200mi. I changed differential, tranny, brake, clutch and oil (about my 3rd oil and filter change).

That said, if there are simple changes I can make to make the car run even better and more safely, then I will certainly consider such matters.

Are you running headers? See http://driveviper.com/forums/threads...903#post156903

I believe the heating issue could be a result of the headers being too close to the oil cooler lines. Hot oil equals hot engine. Stock exhaust no problem.

[BLUETA#1]

Stock exhaust.

[ViperGeorge]

Stock exhaust.

Well that is not what I was hoping. I really thought the heated oil lines could explain the engine heat. Probably still contributes though.

[FLATOUT]

Stock exhaust.

Can you post a video of a lap or two that caused the excessive heat? As fast as you are running at COTA I would like to see and hear what looks like on the car when these temps are jumping up on the car.

Andy

[mjorgensen]

Well that is not what I was hoping. I really thought the heated oil lines could explain the engine heat. Probably still contributes though.

Oil temps are controlled by coolant so if the car is over heating then the oil temps are going to rise, doubt it is the other way around.

[Stealth]

Are you running headers? See http://driveviper.com/forums/threads...903#post156903

I believe the heating issue could be a result of the headers being too close to the oil cooler lines. Hot oil equals hot engine. Stock exhaust no problem.

No headers. Stock CATS and Corsa Cat-back exhaust. Again, I had no error codes, and most of the sessions was running 223F--241F. There were a couple of times where temps were elevated--just after heavy braking using heel-toe from 130mph to 25mph or something. The car cooled down quickly and ran fine.

[TrackAire]

I'm too lazy to do a search, but does the Gen 5 suffer the same issue some Gen 4's had with the radiator hose sucking shut at high rpms?

[Rapidrezults]

Can you post a video of a lap or two that caused the excessive heat? As fast as you are running at COTA I would like to see and hear what looks like on the car when these temps are jumping up on the car.

Andy

I would love to see this as well, just to get an idea of where the RPMs are during the session.

[BLUETA#1]

Can you post a video of a lap or two that caused the excessive heat? As fast as you are running at COTA I would like to see and hear what looks like on the car when these temps are jumping up on the car.

Andy

I back off at 240 before the idiot light goes on at 245. (Trust me it hit 245 once and I have never let it get that high.) There are no sound or power differences. My brother just got his GT4. He took it right to the track. On the streets its runs at 210 degrees. As soon as you are on it, the car in engineered to run at 190 when pushing it hard. Amazing.

[ViperGeorge]

I'm too lazy to do a search, but does the Gen 5 suffer the same issue some Gen 4's had with the radiator hose sucking shut at high rpms?

This is a good question although even with the collapsing hose on my Gen 4 ACR it never got hot on the track.

[TrackAire]

This is a good question although even with the collapsing hose on my Gen 4 ACR it never got hot on the track.

The answer could be as simple as the differences in hoods and engine compartment design and the way the air evacuates out of a Gen 4 vs a Gen 5. Even a 20% reduction in air flow can have measurable effects on the cooling.

[BLUETA#1]

The answer could be as simple as the differences in hoods and engine compartment design and the way the air evacuates out of a Gen 4 vs a Gen 5. Even a 20% reduction in air flow can have measurable effects on the cooling.

You got it!

[SSGNRDZ_28]

Has anyone removed their hood vents to aid in cooling?

[mjorgensen]

Food for thought G4 to modified G5 and what do you see on the nose of the GTSR?

SR013_052VP.jpg
001 (2).jpg
100_4818.jpg

[ViperGeorge]

Food for thought G4 to modified G5 and what do you see on the nose of the GTSR?

SR013_052VP.jpg
001 (2).jpg
100_4818.jpg

Someone should make a grille that has thinner cross bars. I also see the tow hooks on the blue Gen 5, they seem to block air. How many folks with cooling issues are running them? I am for sure but I may need to rethink that. Would getting more air through the radiator help keep header heat down as well? I seem to remember that the fan shroud looked pretty restrictive on a Gen 5 as well. This is needed for low speed but would seem to hinder high speed cooling.

[mjorgensen]

Someone should make a grille that has thinner cross bars. I also see the tow hooks on the blue Gen 5, they seem to block air. How many folks with cooling issues are running them? I am for sure but I may need to rethink that. Would getting more air through the radiator help keep header heat down as well? I seem to remember that the fan shroud looked pretty restrictive on a Gen 5 as well. This is needed for low speed but would seem to hinder high speed cooling.

021.jpg

The upper cross fin in the grill has nothing behind it so if it were neatly cut out then you would get more and smoother airflow to the radiator also. The replacement part if you mess it up is only like $150 so not terrible as an experiment.

You were also supposed to notice that on the GTSR they SPLIT the brake ducts to get more air deflected through the radiator... hmm.

[TrackAire]

Food for thought G4 to modified G5 and what do you see on the nose of the GTSR?

SR013_052VP.jpg
001 (2).jpg
100_4818.jpg

Ok, I'll play mentally undernourished, I'm not sure what you're referring to. Other than the shape difference (Gen 4 looks like it has a little more intake surface area), the Gen 5 appears to have an A/C condenser compared to the race car.

[mjorgensen]

Ok, I'll play mentally undernourished, I'm not sure what you're referring to. Other than the shape difference (Gen 4 looks like it has a little more intake surface area), the Gen 5 appears to have an A/C condenser compared to the race car.

Air flow through the smooth surfaces of the G4 and lack of brake ducts would likely be much more efficient as far as cool air to the radiator. and the racecar brake ducts are split to give more air to the radiator...

[SRT_BluByU]

No headers. Stock CATS and Corsa Cat-back exhaust. Again, I had no error codes, and most of the sessions was running 223F--241F. There were a couple of times where temps were elevated--just after heavy braking using heel-toe from 130mph to 25mph or something. The car cooled down quickly and ran fine.

Just to be clear your talking about your coolant temp and not your oil temps - correct?