APR DTR6054 on track - power loss

[Shmohawk]

Hello everybody,

I have a Mark 7 Jetta GLI with tons of mods to make it a sleeper on road courses. It handles amazingly and stops even better (Alcon 6-piston 380mm rotors). I had an APR DTR6054 turbo installed with an intercooler upgrade. I also have an APR catch can and a VW Racing oil cooler. Recently I added a large hood vent/extractor.

Last week at Road America the car hit 149.7 mph on the front straight. After the oil temps go over 250 (right after the first lap is completed - they then stop at low to mid 260's), the power is pulled significantly - the following lap the speed on the front straight will drop to 135 mph - so I'm losing maybe 100 HP? This was on a day with outside temps in the high 70's.

I spoke with the tech department at APR and they think I'm running into high intake temps - anything over 150 degrees will pull a lot of power. But I have an APR carbon fiber enclosed intake that feeds directly from the factory air opening, so the temps should not be getting that high. I've heard a rule of thumb for track driving is the intake temps usually never get more than 15 degrees above the outside temperature.

On the street, I never have issues with heat - even with pulls to high speeds.

Any thoughts? If I can get this fixed this sleeper Jetta will run with Cayman GT4's and C8 Corvettes (not Z06's).

Thanks

 

[Diggs24]

Get a real tune.

 

[xXDavidCXx]

What are your coolant temps?

 

[Shmohawk]

Get a real tune.

Such as?

 

[Shmohawk]

What are your coolant temps?

I don't know - just oil temps

 

[Shmohawk]

Such as?

Such as?

Can you recommend a "real tune"?

 

[scrllock]

which intercooler?

your oil cooler kit is pushing hot air directly into the cold side of your intercooler, unless you've relocated it with different lines.

your intake has nothing to do with it, that's pre-intercooler.

 

[Shmohawk]

Got it - I have an APR intercooler. Before installing the oil cooler I had the same problem. What do you think about a front-mounted intercooler? Neuspeed makes one - I have the option of keeping the traditional intercooler or removing it. Would removing it allow the radiator and oil cooler to do their jobs more efficiently?

Thanks again for your input

 

[Diggs24]

APR intercooler is great. Its not the issue. Its the tune.

 

[MonkeyMD]

If say regardless of tune, you're going to get power loss at high temps.

On COTA back straight, I can hit 145 in 60° but only 135 at 90+

 

[jay745]

Everyone skips ducting when they slap an intercooler/oil cooler in. That's the most important part.

 

[Shmohawk]

APR intercooler is great. Its not the issue. Its the tune.

What would you recommend?

 

[Shmohawk]

Everyone skips ducting when they slap an intercooler/oil cooler in. That's the most important part.

Sounds good - any specific products I can use?

 

[jay745]

Sounds good - any specific products I can use?

There's no ducting kits, you have to get creative with sheet metal

 

[Shmohawk]

If say regardless of tune, you're going to get power loss at high temps.

On COTA back straight, I can hit 145 in 60° but only 135 at 90+

I think I am fighting heat soak - don't you think a front-mounted intercooler that is in direct airflow and away from the radiator and oil cooler will help?