wstar's Journal

wstar · 04-23-2009, 10:53 AM

Quote:

Originally Posted by travisjb

Sounds like a little friendly competition !

Wstar, also I recall you hit about 250 oil temp a while back... have you seen anything higher since ? ... I'm still trying to validate my theory that the guys driving AT cars aren't overheating nearly as often as the rest of us

I've been up to 260 peak. I wouldn't think the transmission would make the difference though. It's probably just that nobody in a 7AT has really tracked the car.

travisjb · 04-23-2009, 11:33 AM

Quote:

Originally Posted by wstar

I've been up to 260 peak. I wouldn't think the transmission would make the difference though. It's probably just that nobody in a 7AT has really tracked the car.

There's prob some truth to your point that fewer AT folks are inclined to track their cars... and I agree the transmission itself isn't likely... and I also think this car runs hot regardless of transmission... but I think with the manual folks are spending more time at higher RPMs, which is a contributing factor... oil heats up with friction and I suspect friction increases non-linearly with RPMs... automatic transmissions should reduce time at higher RPMs vs manual b/c when it upshifts it does so with 99% precision... and I think realistically, most of us guys with manual transmissions are keeping on the gas at least a little between upshifts... and so for example even if we shift at 7,400 rpm, the car is running up to 7,800 rpm when the clutch is pressed... I suspect a lot of heat is building up between 7,500 and 8,000 rpm for the 6mts... Drivers can help by lifting the gas sooner, but I don't blame it all on us drivers, I think the engagement points in the clutch are too high in the pedal stroke... Based on my own experience and from watching videos of guys driving this car, I'm convinced it is happening a lot... until I find some AT guys overheating, I'm going to keep asking the question... sorry for the long-winded explanation!

miguez · 04-23-2009, 12:35 PM

Quote:

Originally Posted by travisjb

There's prob some truth to your point that fewer AT folks are inclined to track their cars... and I agree the transmission itself isn't likely... and I also think this car runs hot regardless of transmission... but I think with the manual folks are spending more time at higher RPMs, which is a contributing factor... oil heats up with friction and I suspect friction increases non-linearly with RPMs... automatic transmissions should reduce time at higher RPMs vs manual b/c when it upshifts it does so with 99% precision... and I think realistically, most of us guys with manual transmissions are keeping on the gas at least a little between upshifts... and so for example even if we shift at 7,400 rpm, the car is running up to 7,800 rpm when the clutch is pressed... I suspect a lot of heat is building up between 7,500 and 8,000 rpm for the 6mts... Drivers can help by lifting the gas sooner, but I don't blame it all on us drivers, I think the engagement points in the clutch are too high in the pedal stroke... Based on my own experience and from watching videos of guys driving this car, I'm convinced it is happening a lot... until I find some AT guys overheating, I'm going to keep asking the question... sorry for the long-winded explanation!

That's a very good point Travis, probably some truth to that. Also, let's keep in mind the ambient temperature of the locations and days people are reporting engine oil temps, as during this time of the year there can be great temp variations between locations in the US.

wstar · 04-23-2009, 12:41 PM

Quote:

Originally Posted by travisjb

and so for example even if we shift at 7,400 rpm, the car is running up to 7,800 rpm when the clutch is pressed... I suspect a lot of heat is building up between 7,500 and 8,000 rpm for the 6mts...

Even if the driver lets the revs go up when hitting the clutch, shouldn't the rev limiter still stop you around 7.5? With a drive-by-wire throttle, it's not like the rev limiter could ever fail or be confused. Ultimately it's always in control.

miguez · 04-23-2009, 12:50 PM

Quote:

Originally Posted by wstar

Even if the driver lets the revs go up when hitting the clutch, shouldn't the rev limiter still stop you around 7.5? With a drive-by-wire throttle, it's not like the rev limiter could ever fail or be confused. Ultimately it's always in control.

If I recall correctly, I have seen some dyno graphs showing up to 7,800 rpms being reached. I'm not exactly sure if that's accurate or not...?

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