[RimasRS]

Originally Posted by Rob@Cobb

Here is a great place to start:
http://www.cobbtuning.com/BMW-Access...s-installation

Cheers,
Rob

It doesn't say anything should i update firmware or to marry the car in the first step. Just a simple q which step is the first

[paapaa]

http://www.n54tech.com/forums/showthread.php?t=13933

as a general rule the Cobb ran more boost, more fuel, and less advance compared to the JB4. The Stage2+ map is definitely much more aggressive with a peak of 18.5psi compared to JB4 map 2's peak of only 14.5psi, but the JB4 runs a lot more advance and is actually very close in terms of power output from 5000rpm+. The range you'll be operating in during a race. IMHO despite the torque disadvantage the JB4 map 2 feels better around town due to the really poor throttle mapping of the Cobb Stage2+.

any thought on these words or the showed dynos?

[enrita]

Originally Posted by RimasRS

It doesn't say anything should i update firmware or to marry the car in the first step. Just a simple q which step is the first

1. Try to Install it first.
- If your ROM is not recognized i would do the update of firmware through laptop and try again.
- if its still not recognized follow the instructions on their site in how to mail them your Rom

If you manage to install it plug it again to your laptop. you will see what rom you have, download the maps you want and flash it in.
Done

[RimasRS]

Originally Posted by enrita

1. Try to Install it first.
- If your ROM is not recognized i would do the update of firmware through laptop and try again.
- if its still not recognized follow the instructions on their site in how to mail them your Rom

If you manage to install it plug it again to your laptop. you will see what rom you have, download the maps you want and flash it in.
Done

Appreciate... Thank you

[Alpina_B3_Lux]

Originally Posted by 335i E92

Question for Cobb... Are there any known compatibility issues with your maps and the latest BMW software version?

No, I got updated prior to installing the COBB AP just a few weeks ago.

Alpina_B3_Lux

[tscdennab]

Originally Posted by paapaa

http://www.n54tech.com/forums/showthread.php?t=13933

as a general rule the Cobb ran more boost, more fuel, and less advance compared to the JB4. The Stage2+ map is definitely much more aggressive with a peak of 18.5psi compared to JB4 map 2's peak of only 14.5psi, but the JB4 runs a lot more advance and is actually very close in terms of power output from 5000rpm+. The range you'll be operating in during a race. IMHO despite the torque disadvantage the JB4 map 2 feels better around town due to the really poor throttle mapping of the Cobb Stage2+.

any thought on these words or the showed dynos?

I think that they tested the linear throttle mapping because the stock throttle mapping was not available at that time. So the "poor throttle mapping" comment is not valid anymore. Combine with the better torque for Cobb and I'm sure that right now Cobb is more powerful at low-mid RPMs. Also has safer AFRs in that range. But it does run an insane amount of boost. I think that more boost and less timing = less engine efficiency but safer for the engine. But not safer for the turbos. But if you have to pick something that breaks, it would surely be the turbos over the engine

[paapaa]

Originally Posted by tscdennab

I think that they tested the linear throttle mapping because the stock throttle mapping was not available at that time. So the "poor throttle mapping" comment is not valid anymore. Combine with the better torque for Cobb and I'm sure that right now Cobb is more powerful at low-mid RPMs. Also has safer AFRs in that range. But it does run an insane amount of boost. I think that more boost and less timing = less engine efficiency but safer for the engine. But not safer for the turbos. But if you have to pick something that breaks, it would surely be the turbos over the engine

interesting...time will tell how long our stock turbos can handle the big boost.
i dont know but i hope Cobb knows what they are doing and about the boost vs reliability issue.

[enrita]

Originally Posted by paapaa

interesting...time will tell how long our stock turbos can handle the big boost.
i dont know but i hope Cobb knows what they are doing and about the boost vs reliability issue.

as long as the turbos are in their efficiency range there are no issues.

[paapaa]

Originally Posted by enrita

as long as the turbos are in their efficiency range there are no issues.

ok.thanks.

[335i E92]

Originally Posted by enrita

as long as the turbos are in their efficiency range there are no issues.

What defines the 'efficiency range' on stock turbo's? How do we know that 18.5psi is within the efficiency range?

Curious to know how this is calculated?

[335i E92]

Originally Posted by Alpina_B3_Lux

No, I got updated prior to installing the COBB AP just a few weeks ago.

Alpina_B3_Lux

[enrita]

Originally Posted by 335i E92

What defines the 'efficiency range' on stock turbo's? How do we know that 18.5psi is within the efficiency range?

Curious to know how this is calculated?

http://www.e90post.com/forums/showthread.php?t=256804

[paapaa]

Originally Posted by enrita

http://www.e90post.com/forums/showthread.php?t=256804

good link!

i read every page...
but can Cobb tech or someone say that with Cobb AP its just as safe/reliable as using like JB4 or other tunes?

is it too much to ask direct answer from people, (if you know the answer)?
results were interesting to read, but i still dont understand what is the situation with Cobb AP and 18.5psi with 335i and its stock turbos?

[enrita]

Originally Posted by paapaa

good link!

i read every page...
but can Cobb tech or someone say that with Cobb AP its just as safe/reliable as using like JB4 or other tunes?

is it too much to ask direct answer from people, (if you know the answer)?
results were interesting to read, but i still dont understand what is the situation with Cobb AP and 18.5psi with 335i and its stock turbos?

they have already commented on this previously , perfectly fine to run that otherwise they would not boost that much. Safety is 1st priority.

[paapaa]

Originally Posted by enrita

they have already commented on this previously , perfectly fine to run that otherwise they would not boost that much. Safety is 1st priority.

thanks again! i must have missed that commed,sorry.
good to hear, case closed.

[enrita]

Originally Posted by paapaa

thanks again! i must have missed that commed,sorry.
good to hear, case closed.

Originally Posted by Rob@Cobb

There is a boost ceiling on the stage 1 maps and there will be on the stage 2 maps as well. We tuned the stage 1 maps knowing the boost would be in the 13-17psi range. It's no surprise the boost is reaching 16+ psi to us as another vendor might make it out to be. We designed the tune to handle the boost.

What we will be doing is changing the mapping to put a floor under the boost when it gets colder.

Cheers,
Rob

[Juicehead]

Anyone know why 4.00 Stage 2 + FMIC feels like it falls flat at 4k-5k RPM now as compared to 3.01?

I am running the Stock Throttle Map

[enrita]

Originally Posted by Juicehead

Anyone know why 4.00 Stage 2 + FMIC feels like it falls flat at 4k-5k RPM now as compared to 3.01?

I am running the Stock Throttle Map

Log it

[skim7x]

Is timing being pulled from multiple cylinders a sign of something bad going on where i should stop running the tune immediately? Or just a sign that the car is not running optimally?

As many of you know I've had problems with timing being pulled in multiple cylinders and I'm working out the problem now, but in the men time is it still safe to run the tune?

[rader1]

Originally Posted by skim7x

Is timing being pulled from multiple cylinders a sign of something bad going on where i should stop running the tune immediately? Or just a sign that the car is not running optimally?

As many of you know I've had problems with timing being pulled in multiple cylinders and I'm working out the problem now, but in the men time is it still safe to run the tune?

I would go with a less aggressive tune. Try drive or sport and find the most aggressive map that has no incidents of timing correction

[dzenno]

Originally Posted by rader1

I would go with a less aggressive tune. Try drive or sport and find the most aggressive map that has no incidents of timing correction

Its just not realistic to have no timing corrections. Even the stock tune, if you log it with the AP, has timing corrections here and there and that's just fine.

Having a discussion with Rob@Cobb a while back I asked him about timing corrections and basically what they considered knock related/bad and when it would be wise to back down on aggressiveness in a tune. Very roughly speaking, when you see multiple cylinders starting to have timing corrections at the same time (cylinders talking) this should be an indicator of higher aggression than the level of octane the engine is using safely supports.

If you see a bit of timing correction (3.x and less) on a single cylinder or 2 non adjacent cylinders here and there, that's perfectly normal and not to be worried about really.

[marv85]

Originally Posted by skim7x

Is timing being pulled from multiple cylinders a sign of something bad going on where i should stop running the tune immediately? Or just a sign that the car is not running optimally?

As many of you know I've had problems with timing being pulled in multiple cylinders and I'm working out the problem now, but in the men time is it still safe to run the tune?

Originally Posted by rader1

I would go with a less aggressive tune. Try drive or sport and find the most aggressive map that has no incidents of timing correction

Post some logs.

I get some drops every once in awhile on cylinder 5 sometimes on cylinder 2... the ECU does a great job of protecting your engine.

However like rader mentioned, try the less aggressive variants of the tune and log!