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Old 04-28-2017, 12:01 AM   #43
Short Bus
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Quote:
Originally Posted by red_stapler View Post
Thanks, that was much more eloquent than my attempts at explaining earlier in the thread.
Yeah, and moving hot air away from the turbo is something, but the turbo probably isn't the best heat exchanger. So I think a better approach is to focus on airflow through the actual heat exchangers.

That said I'm not going to claim to know that to be an absolute fact without taking collecting some data, but most information you can find out there regarding how air flows around a car in motion suggests that you want that portion of the hood to remain sealed unless you have a very specific reason to open it (like a cowl induction intake).

I also have to wonder what removing that strip is doing for your interior vents. If you're trying to use the heater core to shed a bit more heat removing the strip might be robbing you of fresh air to do that with.

I guess another way to test this is before and after logs of the coolant and oil temps. Assuming a four run day trying to get the two in the mid day window to minimize ambient temperature deviation would be interesting to see.

So what aspect of a tune is causing the heat? Is it simply higher turbine speeds creating more heat being passed to the oil and coolant? Higher IATs? More fuel burned in the combustion chamber? All of the above?
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Old 04-28-2017, 12:27 AM   #44
Cadubya
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Quote:
Originally Posted by Short Bus View Post
Yeah, and moving hot air away from the turbo is something, but the turbo probably isn't the best heat exchanger. So I think a better approach is to focus on airflow through the actual heat exchangers.



That said I'm not going to claim to know that to be an absolute fact without taking collecting some data, but most information you can find out there regarding how air flows around a car in motion suggests that you want that portion of the hood to remain sealed unless you have a very specific reason to open it (like a cowl induction intake).



I also have to wonder what removing that strip is doing for your interior vents. If you're trying to use the heater core to shed a bit more heat removing the strip might be robbing you of fresh air to do that with.



I guess another way to test this is before and after logs of the coolant and oil temps. Assuming a four run day trying to get the two in the mid day window to minimize ambient temperature deviation would be interesting to see.



So what aspect of a tune is causing the heat? Is it simply higher turbine speeds creating more heat being passed to the oil and coolant? Higher IATs? More fuel burned in the combustion chamber? All of the above?


For the K04 it's a turbo operating way out of its efficiency range. High boost + low efficiency = lots of heat.
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Old 04-28-2017, 01:18 AM   #45
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Originally Posted by Cadubya View Post
For the K04 it's a turbo operating way out of its efficiency range. High boost + low efficiency = lots of heat.
So basically, ask your tuner to tune for peak efficiency according to the compressor map?


Regarding the weather strip, it looks like Modshack performed some tests...

http://www.golfmk6.com/forums/showthread.php?t=39763

He sums it up by saying that it will reduce engine bay temps, bit not necessarily engine temps. So this doesn't look helpful, but maybe not harmful either.
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Old 07-14-2017, 05:39 PM   #46
davidfromphoenix
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Originally Posted by RudolphTheRedNosedGTI View Post
I too am APR K04 and track very hard on road courses. If its warmer than 70*F outside, temps will get to 240+ very quickly, usually meaning I have to back off, and hopes for good times that day go down.

I have heard of others running a 70/30 mix of dist. water and coolant, but the owners manual states you should not run less than 60/40 dist. water and coolant. I was going to do a full coolant flush (to remove the possibility theres air in the thermostat as the radiator has been removed a few times now) and swap to that, as well as add water wetter.

Will report with findings
I have the exact same setup with the exact same problem - my Mk6 GTI w/K04 gets to 240+ very quickly on track, even on very cool mornings (albeit, I live in AZ). I've got an an auxiliary oil cooler installed inside the engine bay with its own fan, which makes almost no difference for coolant temps on track - go figure. Wish our US GTIs came with oil temp sensors, so I knew if it was helping.... anyway, from some consulting with a few "experts", including Ron Davis, who happens to be a friend of mine, I've got three routes I'm considering at this point to solve this:

1) upgraded main radiator **
2) finding a way to install auxiliary rads (like on the Golf R)
3) divorcing the coolant system from the oil system somehow, to stop the oil temps from affecting the coolant. Tryolsport recommended this when I talked with them, but didn't have a solution available anymore.
** My other issue is my GTI happens to be a CBFA engine, so upgrading the radiator guarantees a CEL, and nobody I've talked to believes they can work around it, besides Ron Davis, who is the most expensive.

Ron Davis also recommended ensuring I was getting optimal airflow to the radiator, including possibly damming air up into the rad, and to look for possible areas of low pressure to create vents to increase airflow. I don't know how feasible the former would be on a Mk6 though.

Anyway, just wondered if you'd had any luck since you last posted, including your change in mixture, water wetter ,etc... Also, if anyone with a Mk6 is interested in going in with me to have Ron Davis make a few world-class aftermarket rads for us at a reduced cost, I'd definitely consider that heavily...
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Old 07-14-2017, 10:18 PM   #47
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Quote:
Originally Posted by davidfromphoenix View Post
I have the exact same setup with the exact same problem - my Mk6 GTI w/K04 gets to 240+ very quickly on track, even on very cool mornings (albeit, I live in AZ). I've got an an auxiliary oil cooler installed inside the engine bay with its own fan, which makes almost no difference for coolant temps on track - go figure. Wish our US GTIs came with oil temp sensors, so I knew if it was helping.... anyway, from some consulting with a few "experts", including Ron Davis, who happens to be a friend of mine, I've got three routes I'm considering at this point to solve this:

1) upgraded main radiator **
2) finding a way to install auxiliary rads (like on the Golf R)
3) divorcing the coolant system from the oil system somehow, to stop the oil temps from affecting the coolant. Tryolsport recommended this when I talked with them, but didn't have a solution available anymore.
** My other issue is my GTI happens to be a CBFA engine, so upgrading the radiator guarantees a CEL, and nobody I've talked to believes they can work around it, besides Ron Davis, who is the most expensive.

Ron Davis also recommended ensuring I was getting optimal airflow to the radiator, including possibly damming air up into the rad, and to look for possible areas of low pressure to create vents to increase airflow. I don't know how feasible the former would be on a Mk6 though.

Anyway, just wondered if you'd had any luck since you last posted, including your change in mixture, water wetter ,etc... Also, if anyone with a Mk6 is interested in going in with me to have Ron Davis make a few world-class aftermarket rads for us at a reduced cost, I'd definitely consider that heavily...
What are you doing currently to provide increased cooling? Which intercooler are you running? What water/coolant ratio are you running? Which radiator are you running? Do you have any aux DSG cooling system?
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