CEL solution

[gmd2003]

Unfortunately the 4th gear drivetrain malfunction has nothing to do with the emissions CEL .

[mstmng]

Originally Posted by Mike@N54Tuning.com

BMS' CAN Tool does just that. You connect it and its hidden under the carpet. Auto clears any downpipes codes and allows real codes to still show a light in dash.

Mike

could you please post a link to this tool?

[chudak18]

Down pipe time 8]

[boots]

Originally Posted by mstmng

could you please post a link to this tool?

Ill pm it to you

[greentrbo95gst]

Originally Posted by gmd2003

Unfortunately the 4th gear drivetrain malfunction has nothing to do with the emissions CEL .

It's questionable because in theory the CEL on catless car is caused by too many air counts being accounted for and DT Mal comes up under heavy load (WOT in 4th, 5th, etc) by receiving a signal from the ECU so if your CEL is not on, technically you can trick the ECU to think that the air flow is still the same and your DT MAL wont come on.

[gmd2003]

Originally Posted by greentrbo95gst

It's questionable because in theory the CEL on catless car is caused by too many air counts being accounted for and DT Mal comes up under heavy load (WOT in 4th, 5th, etc) by receiving a signal from the ECU so if your CEL is not on, technically you can trick the ECU to think that the air flow is still the same and your DT MAL wont come on.

Actually the CEL that always occurs with downpipes is a catalyzer efficiency code that has 0 to do with performance . Hook your car up to a code reader . The lack of backpressure from being catless does cause too much airflow in situations which require prolonged maximum boost , i.e . Top of 4th gear . The duration of the increased flow in these situations is beyond the threshold the ECU will accept then it will throw the drivetrain malfunction . These two things are totally unrelated . An auto code clearer will not prevent the later , it will just remove the emissions CEL .

[greentrbo95gst]

Originally Posted by gmd2003

Actually the CEL that always occurs with downpipes is a catalyzer efficiency code that has 0 to do with performance . Hook your car up to a code reader . The lack of backpressure from being catless does cause too much airflow in situations which require prolonged maximum boost , i.e . Top of 4th gear . The duration of the increased flow in these situations is beyond the threshold the ECU will accept then it will throw the drivetrain malfunction . These two things are totally unrelated . An auto code clearer will not prevent the later , it will just remove the emissions CEL .

I totally agree with this. What made me change my opinion or maybe I should say got me confused is the sudden change in situation as far as my DT Mal. Ever since the CEL has been cleared I did multiple 3rd, 4th and 5th gear pulls and no error triggered. Before I would get the message every time.

[gmd2003]

Originally Posted by greentrbo95gst

I totally agree with this. What made me change my opinion or maybe I should say got me confused is the sudden change in situation as far as my DT Mal. Ever since the CEL has been cleared I did multiple 3rd, 4th and 5th gear pulls and no error triggered. Before I would get the message every time.

Several things are at play . Different conditions ,temperature will have a huge effect on air density , and barometric pressure of 30.5 vs 29.7. Also the ECU will try to adapt to the increased flow , so I would expect the number of malfunctions to decrease over time. Until someone cracks the ECU and changes the parameters that trigger the drivetrain malfunction they will always occur occasionally . A code clearer is nice to not have to look at the emissions light though .

[Mike@N54Tuning.com]

Originally Posted by greentrbo95gst

I totally agree with this. What made me change my opinion or maybe I should say got me confused is the sudden change in situation as far as my DT Mal. Ever since the CEL has been cleared I did multiple 3rd, 4th and 5th gear pulls and no error triggered. Before I would get the message every time.

Get a BT cable for $179 and read the code. This isn't rocket science. The code will tell you what is wrong with your car.

Mike

[greentrbo95gst]

Originally Posted by Mike@N54Tuning.com

Get a BT cable for $179 and read the code. This isn't rocket science. The code will tell you what is wrong with your car.

Mike

Mike, I already know the code my car is throwing. I have the CAN tool and the CEL is not on anymore. We are talking about DT Mal rather than CEL, which might be related.

[AlphaAlpineM6]

at least the car's protecting itself.

[gmd2003]

Originally Posted by AlphaAlpineM6

at least the car's protecting itself.

Definitely, with catless Dp's it may be beyond its adjustment capacity in some situations and is running lean.Or it could be a a million other things, speculation in this case is not fact. What is fact is making a light in the dash go away isn't fixing the problem.It would be nice for someone with catless DP's to get their car data logged while on a dyno to figure this out.

[greentrbo95gst]

It doesnt help that we dont have full datalogging capability.

[gmd2003]

Originally Posted by greentrbo95gst

It doesnt help that we dont have full datalogging capability.

With my Kiwi PLX and dashcommander iphone app I can look at data from timing , to wide band readings, so I'm sure most dyno operators have similar capability. At the very least you can rule out running lean , which would be my primary concern.

[greentrbo95gst]

Originally Posted by gmd2003

With my Kiwi PLX and dashcommander iphone app I can look at data from timing , to wide band readings, so I'm sure most dyno operators have similar capability. At the very least you can rule out running lean , which would be my primary concern.

Interesting. Would you mind posting a log from a 3rd and 4th gear pull showing timing and air/fuel ratios? What mods do you have done to your car?
Which o2 sensor did you replace with the Kiwi?

[gmd2003]

Originally Posted by greentrbo95gst

Interesting. Would you mind posting a log from a 3rd and 4th gear pull showing timing and air/fuel ratios? What mods do you have done to your car?
Which o2 sensor did you replace with the Kiwi?

I have SS 200 cell catted DP's so that wouldn't help you out , I don't have the DT malfunction . I do have the emissions code though after a 1000 miles on one bank . Apparently US cars are a bit more stringent . SS has been great about it though they are sending me their spacers with microcats for free . Obviously the performance of the 200 cell on my m6 is awesome (7.9 60-130 , 11.4 128.5 1/4 ) , no smell and awesome sound , no DT malfunction ) , so I'm happy . I did take some data logs though, I'll try to pull the relevant data . Our cars like the E63 M6 have wideband o2's stock and the ECU uses this data to adjust AFR on the go . The PLX just lets you look at the values the ECU is reading .
George

[EM1]

Hi, New to the forum and just got cat less downpipes and CAN tool. CAN tool is keeping check engine light off but car is still getting a malfunction (drivetrain reduced power) in top of 4th gear under wide open throttle sometimes.

[greentrbo95gst]

I would remove the CAN and pull the codes to see if you are getting any other codes than catalysts.

[EM1]

Working on that as i don't have the code reader. Tried to get my friend to read and the couldn't get communication with the car.

[EM1]

Ok, got some codes. Maybe you guys can help me decipher.

482BAC regulated differential lock, DSC function: not available

48002C ICM, ACC:interface DSC

480113 DTC button permanently pressed

[greentrbo95gst]

Ouch, that's definitely something else. It's not downpipe related.

[boots]

green did you test out yet by unplugging