[sg335]

You make a good point about how fast the cooling system can cool the water, but maybe it only takes 1 or 2 degrees to turn back on the power and this could happen in 30 seconds of a cool down lap? I still think it may be the charge air intake temps. This is the main culprit in a SC car and the problems being discussed with power loss is exactly what I had with my other car. A larger air to water HE cured the problem. Cylinder's five and six also are known to get hotter than the others. Are there sensors for each cylinder bank that tell the car to shut power down at a certain temp?

[2e9x's]

From the technical documents posted in the forced induction forum here, it LOOKS like there is only one temperature sensor (based on the schematic).

http://www.e90post.com/forums/showthread.php?t=38856

It also looks like a CEL would be thrown if the intake air temp was too high (look at page 18). Also it does look like a couple of degrees would make a difference in power output. According to the specs above, it looks like power is reduced from 100% after 244 degrees coolant temp and 305 degrees oil temp (if I am reading the chart right). Did your temperatures get that high?

I really wonder whether or not you and jjlawyer were experiencing temperature related or knock related problems. Would you consider using 100 next time you go to the track? That would help eliminate knock as a potential cause...

[S4to335]

Originally Posted by White05X3

From the technical documents posted in the forced induction forum here, it LOOKS like there is only one temperature sensor (based on the schematic).

http://www.e90post.com/forums/showthread.php?t=38856

It also looks like a CEL would be thrown if the intake air temp was too high (look at page 18). Also it does look like a couple of degrees would make a difference in power output. According to the specs above, it looks like power is reduced from 100% after 244 degrees coolant temp and 305 degrees oil temp (if I am reading the chart right). Did your temperatures get that high?

I really wonder whether or not you and jjlawyer were experiencing temperature related or knock related problems. Would you consider using 100 next time you go to the track? That would help eliminate knock as a potential cause...

I put 100 octane in my car recently and it didnt run as well as stock...figure that one out. I have used 100 octane on several chipped turbocharged Audis..and it definitely was felt. In the 335i...it was felt..but in the wrong way.

[2e9x's]

Originally Posted by S4to335

I put 100 octane in my car recently and it didnt run as well as stock...figure that one out. I have used 100 octane on several chipped turbocharged Audis..and it definitely was felt. In the 335i...it was felt..but in the wrong way.

Damn...I wonder what THAT'S about??? Did you buy the gas from a reputable station? A little while back a local Union76 sold a bunch of us 100 that turned-out NOT to be 100.

What difference did you notice with the 100 on the 335i?

[533ogetnom]

Originally Posted by reb03

Oil temp was 285-290 and yes I have the cooler.

The CarChip logs:

Speed in MPH
RPM
Throttle position
Engine Load
Coolant Temp
Intake manifold pressure
Air flow rate
Intake air temp
Timing advance
Fuel pressure
Fuel system status
Short-term fuel trim
Long-term fuel trim
Oxygen sensor voltage
Battery voltage
...and a few other things...

You can record any of the above 5 at once.

something i just realized, you could use this scanner to determine the quality of gas!!! you could go fill up on shell gas and run through a tank logging it and then go fill up at 7/11 and see what happens!!

does it give you just the plain degree or does it give you a value pertaining to current load and such

[boostaholic786]

ya i def want one of these