Boost Issue on LC ?

[S7_UAE]

I recently had this issue where I lose boost over 50% when shifting to 2nd gear using launch control only.

notice this boost bar on the attached video.


http://vid19.photobucket.com/albums/b164/saudalzaabi/20140830_195411.mp4

another thing is that my oil temp after warm up is always (98c) 208.5F and during driving or just few WOT's the oil temp goes up to (111c) 231.8F after I cruise for a bit it gets back to my "Normal" Which is 208.5F.

The annoying thing is that I feel over 30awhp in performance when the temp is just below (85c) 185F but once it rises I lose power... How do I compare ?

First race vs a stock 2014 S8 .. beat him by 2 car lengths.. 2nd race is hes beside me, 3rd race is my front bumper is near his driver door.

one last thing is that how do you COMPLETELY turn the ESC OFF ?

tried the ESC OFF button for few seconds but didnt help. any other way ?

[sciblades]

Car is getting too hot, this is why intercoolers are needed!


Those or us who track regularly know that unless you let the car sit after a run it heat soaks very fast. All good dyno #'s are done in cold weather along with high trap speeds.

[S7_UAE]

That solves one issue... they heat soak so damn fast that I really cant race anyone..

What about the ESC? And loss of boost ?

[sciblades]

That is due to the heat will go away when not overheating, the ecu is protecting the car.

[Westyfield2]

... Hence why some tuners produce Charge Coolers http://www.goapr.com/products/cps_b8_30tfsi.html

[kiku]

I'm going the route of cryogenic cooling for the intercoolers.

[S7_UAE]

Sci blade : which means that my car is always overheated .. lol I was hoping that the engine oil my dealer uses was and is the problem.

Westyfield2 : that link is for a 3.0tfsi supercharged audis.. not my S7 no tuner developed anything yet for the 4.0tt.

Kiku: whats cryogenic cooling man ?


Any ideas if meth spraying will help without updating the ecu tune ?

[ecpChris]

Meth will certainly help bring IATs down. You don't need to update the tune to do that.
The oil temps won't go down without bigger oil cooler


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[Arnie49]

The reason you are not getting full boost in second gear is because you do not need it. The gearing in second gear is sufficient to accelerate without full boost. Do you get full boost in 3rd and 4th gear which you should. Also do you have the car in dynamic mode and Sport?

[ecpChris]

I can't think why anyone wouldn't need full boost in second gear if WOT, especially in an awd car without traction issues.


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[LINDW4LL]

I don't think it's a heat soak issue. If you just gun it from a stop without launch control do you get full boost through all gears?

[kiku]

Sci blade : which means that my car is always overheated .. lol I was hoping that the engine oil my dealer uses was and is the problem.

Westyfield2 : that link is for a 3.0tfsi supercharged audis.. not my S7 no tuner developed anything yet for the 4.0tt.

Kiku: whats cryogenic cooling man ?


Any ideas if meth spraying will help without updating the ecu tune ?

Should have included a link.

http://www.designengineering.com/category/catalog/cryo2-system-components/cryo2-intercooler-sprayer-kit

Next time I get to the track, I'll do a full logging to show the IAT after a hot lap.

With that said, on a 25 min hit session my rs7 holds oil temperature no higher than daily driving. So I am very confident in the oil cooling in an rs7.

But, as sciblades has already mentioned, the weak link now is intake temperatures. While the S models have only one side mount intercoolers, and the rs7 has two, they still get heat soaked pretty easily. That's why I am considering the CO2 cryogenic kit to temporarily cool down the intercoolers without having to install something intrusive like meth or messing with mechanicals.

[sciblades]

Sci blade : which means that my car is always overheated .. lol I was hoping that the engine oil my dealer uses was and is the problem.

Westyfield2 : that link is for a 3.0tfsi supercharged audis.. not my S7 no tuner developed anything yet for the 4.0tt.

Kiku: whats cryogenic cooling man ?


Any ideas if meth spraying will help without updating the ecu tune ?
You live in a very hit climate.

[S7_UAE]

The reason you are not getting full boost in second gear is because you do not need it. The gearing in second gear is sufficient to accelerate without full boost. Do you get full boost in 3rd and 4th gear which you should. Also do you have the car in dynamic mode and Sport?

Trust me, I need it.. Who doesnt need boost man ? LOL. and once it shfts to second, NO BOOST in 2nd 3rd 4th...

Yes I had the car in dynamic mode and Sport with traction off.


I don't think it's a heat soak issue. If you just gun it from a stop without launch control do you get full boost through all gears?
I Don't think its heat soak issue because if gunned from a stop without launch control it drives with full boost no issues.. I am suspecting it to be traction issues for safty reason ? because with LC it breaks all 4 wheels out of traction.

[S7_UAE]

You live in a very hit climate.

True, but we never do lose this much power with GT500's and boostd 5.0L mustangs through heat soak. the Audi's engine bay just traps all the heat and never lets out.

[Arnie49]

If you are not getting boost in 3rd or 4th gear you definitely have a problem. You most likely have either leak in one of the hoses and are losing pressure which prevents full boost or the pop off valve is defective which is bleeding off boost. I have had many turbo charged cars you should probably read a technical paper on turbo boost and how throttle position , transmission gearing etc. effect boost pressure.. But in your case there is something wrong most likely a boost leak.

[LINDW4LL]

If you are not getting boost in 3rd or 4th gear you definitely have a problem. You most likely have either leak in one of the hoses and are losing pressure which prevents full boost or the pop off valve is defective which is bleeding off boost. I have had many turbo charged cars you should probably read a technical paper on turbo boost and how throttle position , transmission gearing etc. effect boost pressure.. But in your case there is something wrong most likely a boost leak.
It's a software issue I think. As he stated, everything works perfectly without launch control.

[MYAUDIS7]

I recently had this issue where I lose boost over 50% when shifting to 2nd gear using launch control only.

notice this boost bar on the attached video.


http://vid19.photobucket.com/albums/b164/saudalzaabi/20140830_195411.mp4

another thing is that my oil temp after warm up is always (98c) 208.5F and during driving or just few WOT's the oil temp goes up to (111c) 231.8F after I cruise for a bit it gets back to my "Normal" Which is 208.5F.

The annoying thing is that I feel over 30awhp in performance when the temp is just below (85c) 185F but once it rises I lose power... How do I compare ?

First race vs a stock 2014 S8 .. beat him by 2 car lengths.. 2nd race is hes beside me, 3rd race is my front bumper is near his driver door.

one last thing is that how do you COMPLETELY turn the ESC OFF ?

tried the ESC OFF button for few seconds but didnt help. any other way ?

Have you contacted the tuner on this?

[sciblades]

He doesn't need to call his tuning company, if he logs is iat he will see they are just wayy too high.

[LINDW4LL]

He doesn't need to call his tuning company, if he logs is iat he will see they are just wayy too high.
Then why does he get full boost through all gears when he doesn't use launch control? That argument doesn't make sense, nor does the boost leak theory.

Also when IATs are high doesn't the car pull timing, not boost? On other turbocharged Audi engines, you'll still get full boost in high heat, but car will be slow.

[MYAUDIS7]

^what he said. This is my 1st turbo car so I am still learning the ins and outs. I've already made my decision on my upcoming tune tho based on many conversations on this forum and others nation wide

[Arnie49]

I have seen hoses not being able to hold the increased boost on modified cars. They leak at overboost but not with a normal boost. Usually new hoses and clamps are needed that can handle the extra boost.

[S7_UAE]

IS there ANY way t completely switch OFF the traction ? Everytime I hit the ECS button it says ECS : SPORT ,,