BMW 1M Cobb Logs

[aalfayez]

Hey guys,

I don't really know how to read logs and interpret the numbers associated with each parameter. It would be great if someone would check my logs out and inform me whether they look healthy or not (COBB AP was used for logging)

The car feels hesitant sometimes under acceleration, I haven't change the plugs and coils in a long time but plan on doing so very soon. I have my mods listed in the signature and the ambient temperature outside today was 98f (very humid too)

I did 2 pulls ~30 mins apart and couldn't take it further than ~5800 rpm as I ran out of road

Any help is greatly appreciated

[GimmeanM]

Guessing here, but check your Lambda values (bank 1 and 2). I believe this indicates fuel pressure. They should return to a nominal value when off throttle. If these are off it could indicated injector or pump related problems?

For comparison I show 235.2 off throttle and ~13.5 WOT.

Good luck,
Dave

[E30 Racer]

Can you post a datazap link?

[E30 Racer]

Originally Posted by GimmeanM

Guessing here, but check your Lambda values (bank 1 and 2). I believe this indicates fuel pressure. They should return to a nominal value when off throttle. If these are off it could indicated injector or pump related problems?

For comparison I show 235.2 off throttle and ~13.5 WOT.

Good luck,
Dave

Lambda is air/fuel ratio...

[aalfayez]

I should've used Datazap from the beginning it's much better and it should make it easier for you guys to view the logs

Here's the link: http://www.datazap.me/u/aalfayez/log...4-5-6-7-8-9-14

[E30 Racer]

Originally Posted by aalfayez

I should've used Datazap from the beginning it's much better and it should make it easier for you guys to view the logs

Here's the link: http://www.datazap.me/u/aalfayez/log...4-5-6-7-8-9-14

Can you provide any more data channels (e.g., lambda, timing, throttle position, etc)? Also, try logging from 2k to 6k rpm in 3rd gear using full throttle with DSC disabled (not just on MDM). What you've shown so far doesn't look bad, but it's hard to really understand what's going on.

[aalfayez]

Originally Posted by E30 Racer

Can you provide any more data channels (e.g., lambda, timing, throttle position, etc)? Also, try logging from 2k to 6k rpm in 3rd gear using full throttle with DSC disabled (not just on MDM). What you've shown so far doesn't look bad, but it's hard to really understand what's going on.

I'll try to do that today but the problem is I don't have stretch of road that's long enough to do a WOT third gear pull without it having speed bumps or cameras . I think traction was off during those logs... it's never on when I drive

[aalfayez]

Or I might just wait until I switch over to MhD in a couple of weeks. I believe you can even log more parameters using that over Cobb.

[CarJunkie]

I am not able to read my own logs very well, especially for trouble shooting, sorry.

Having said that, can you describe the hesitation better? Do you have any codes? Misfires don't always throw codes, but if you have the codes it would help. Are you on the original injectors?

[aalfayez]

Originally Posted by CarJunkie

I am not able to read my own logs very well, especially for trouble shooting, sorry.

Having said that, can you describe the hesitation better? Do you have any codes? Misfires don't always throw codes, but if you have the codes it would help. Are you on the original injectors?

When I think of it I don't think hesitation was the right word to use, the car just feels different every pull. I would do a pull and feel the car is running very strong and then do another and feel it's not performing well... I don't think I can really descrbe it to be honest... but the car just feels hard to drive smoothly sometimes too

I'm still on stock injectors

[CarJunkie]

Originally Posted by aalfayez

When I think of it I don't think hesitation was the right word to use, the car just feels different every pull. I would do a pull and feel the car is running very strong and then do another and feel it's not performing well... I don't think I can really descrbe it to be honest... but the car just feels hard to drive smoothly sometimes too

I'm still on stock injectors

It may just be learning, or it may not be the map most suited to your mods. I tried stage 1 and stage 2 and both felt about the same.

Then I went with a custom tune and it was night and day!

[aalfayez]

Originally Posted by CarJunkie

It may just be learning, or it may not be the map most suited to your mods. I tried stage 1 and stage 2 and both felt about the same.

Then I went with a custom tune and it was night and day!

I think it's a combination of different things other than learning as I've had the car for a while now. First of all the ceramic clutch plays a very big role in smoothness and driveability (but I don't really mind it as I enjoy driving a car with a clutch that's hard to operate)

Second, as you mentioned, is that my car doesn't really like my current map too much. I'm going to switch over to MHD soon and get a custom tune so I think that would help a lot power and driveability wise.

What tune do you have on your car?

[CarJunkie]

Originally Posted by aalfayez

What tune do you have on your car?

See Sig.

BuraQ can tune using your logs via email with either MHD or Cobb. It may be worth reaching out to him before paying for MHD. There are many advantages to MHD, but I stayed with Cobb because I like the device itself and am 100% IOS, so I would have had to buy an android device just to use MHD and it never quite seemed worth it to me.

[E30 Racer]

Agreed. BQ seems to have better (less iterative) results with Cobb, but can do some nice things with MHD as well. Might as well try working with Cobb if you already have it.

[aalfayez]

I'm usually on my phone so I can't see signatures unless I go to your page. I'm still trying to get used to this website

I think I'm going to switch to mhd anyway as it has more features. I'll install everything and contact Buraq to see what we can do.