All COBB Tuning AccessPORT for 135i Discussion Here

yawn · 06-25-2013, 02:00 AM

So finally installed Stage1+ and decided see what kind of a difference the tune makes. Took her out for a bit if a drive and noticed a few things:

On one or two pedal to the metal runs, I noticed a slight surge in acceleration after lift-off. As I understand, others have experienced this issue, but, any resolution to this? Could be quite dangerous if you take your foot off to start to slow down, only to have the car accelerate for a split second more. Doesn't happen every time, but then again, all it takes is to be at the wrong place at the wrong time...

Also, I noticed from inside the cabin, there is a more metallic drone under acceleration now. This was definitely not there prior to the tune. Any thoughts guys? Something that wasn't loud before has become much louder.

Definitely happy with the added power the car has now - acceleration is much greater lower in the rev range. However, there is now a lack of smoothness in the delivery of this power. Guess a pro-tune should help fix this eh? Overall though, you could say I'm a happy camper with the tune

Thoughts appreciated!

EDIT: was just mulling over the "surge in acceleration after lift-off" issues - could it be that it just takes time for the car to adapt?

RimasRS · 06-25-2013, 03:15 AM

Quote:

Originally Posted by sharkatron

So finally installed Stage1+ and decided see what kind of a difference the tune makes. Took her out for a bit if a drive and noticed a few things:

On one or two pedal to the metal runs, I noticed a slight surge in acceleration after lift-off. As I understand, others have experienced this issue, but, any resolution to this? Could be quite dangerous if you take your foot off to start to slow down, only to have the car accelerate for a split second more. Doesn't happen every time, but then again, all it takes is to be at the wrong place at the wrong time...

Also, I noticed from inside the cabin, there is a more metallic drone under acceleration now. This was definitely not there prior to the tune. Any thoughts guys? Something that wasn't loud before has become much louder.

Definitely happy with the added power the car has now - acceleration is much greater lower in the rev range. However, there is now a lack of smoothness in the delivery of this power. Guess a pro-tune should help fix this eh? Overall though, you could say I'm a happy camper with the tune

Thoughts appreciated!

EDIT: was just mulling over the "surge in acceleration after lift-off" issues - could it be that it just takes time for the car to adapt?

Let car to adapt talking about any of those things you mentioned

euro2fast4u · 06-25-2013, 09:16 AM

Quote:

Originally Posted by sharkatron

So finally installed Stage1+ and decided see what kind of a difference the tune makes. Took her out for a bit if a drive and noticed a few things:

On one or two pedal to the metal runs, I noticed a slight surge in acceleration after lift-off. As I understand, others have experienced this issue, but, any resolution to this? Could be quite dangerous if you take your foot off to start to slow down, only to have the car accelerate for a split second more. Doesn't happen every time, but then again, all it takes is to be at the wrong place at the wrong time...

Also, I noticed from inside the cabin, there is a more metallic drone under acceleration now. This was definitely not there prior to the tune. Any thoughts guys? Something that wasn't loud before has become much louder.

Definitely happy with the added power the car has now - acceleration is much greater lower in the rev range. However, there is now a lack of smoothness in the delivery of this power. Guess a pro-tune should help fix this eh? Overall though, you could say I'm a happy camper with the tune

Thoughts appreciated!

EDIT: was just mulling over the "surge in acceleration after lift-off" issues - could it be that it just takes time for the car to adapt?

Does the metallic noise sound like BB's in a tin can?

yawn · 06-25-2013, 04:51 PM

Quote:

Originally Posted by euro2fast4u

Quote:

Originally Posted by sharkatron

So finally installed Stage1+ and decided see what kind of a difference the tune makes. Took her out for a bit if a drive and noticed a few things:

On one or two pedal to the metal runs, I noticed a slight surge in acceleration after lift-off. As I understand, others have experienced this issue, but, any resolution to this? Could be quite dangerous if you take your foot off to start to slow down, only to have the car accelerate for a split second more. Doesn't happen every time, but then again, all it takes is to be at the wrong place at the wrong time...

Also, I noticed from inside the cabin, there is a more metallic drone under acceleration now. This was definitely not there prior to the tune. Any thoughts guys? Something that wasn't loud before has become much louder.

Definitely happy with the added power the car has now - acceleration is much greater lower in the rev range. However, there is now a lack of smoothness in the delivery of this power. Guess a pro-tune should help fix this eh? Overall though, you could say I'm a happy camper with the tune

Thoughts appreciated!

EDIT: was just mulling over the "surge in acceleration after lift-off" issues - could it be that it just takes time for the car to adapt?

Does the metallic noise sound like BB's in a tin can?

Lol no - no waste gate rattling just drone.

foghat · 06-25-2013, 05:38 PM

Quote:

Originally Posted by 135Pats

It's really a simple process in terms of what you are doing mechanically, my ER pipe came with good instructions and it makes enough sense. Again, can't over state how much faster it gets once you've done it once. Will probably take you a few hours to go slowly and figure out a few "problems" the first time you do it, but that's just the nature of working in a cramped engine bay. The only hitch I ran into the first time was unplugging the MAP sensor from the OE piping, but outside of that it was cake. If you get around to it and the directions are confusing PM me and i'll try to help out

It's blind luck man, some people can run 18.5+ PSI through their OE piping for 50K with no issues, others blow theirs off the throttle body at 8 PSI. I'd just replace it for peace of mind.

I thought the issue with charge pipes blowing was an n55 thing? No?

135Pats · 06-25-2013, 06:16 PM

Quote:

Originally Posted by foghat

I thought the issue with charge pipes blowing was an n55 thing? No?

It sucks even more on the N55...but it def. can crack on the N54.

Gemballa1980 · 06-25-2013, 11:08 PM

Hi all,

Just ran my first logs.. Was just curious if anyone could take a quick look and highlight if there's anything I should be concerned about.

FBO running Stage 2+ agg on 98oct

Datalog 4 is a 2nd - 3rd - 4th geat WOT pull
Datalog 5 is a 2nd - 3rd gear WOT pull

Thinking about getting a PTF etune done as I'm in Australia and have no local tuners.

Thanks in advance!

1911A145 · 06-26-2013, 12:02 AM

Quote:

Originally Posted by Gemballa1980

Hi all,

Just ran my first logs.. Was just curious if anyone could take a quick look and highlight if there's anything I should be concerned about.

FBO running Stage 2+ agg on 98oct

Datalog 4 is a 2nd - 3rd - 4th geat WOT pull
Datalog 5 is a 2nd - 3rd gear WOT pull

Thinking about getting a PTF etune done as I'm in Australia and have no local tuners.

Thanks in advance!

Look's "OK" , but Can you PLEASE get a data log starting in erd gear @ 2k rpm and go to reline and then end the log. do the same in 4th. make sure you log both LTFT's banks. as well.

Thanks.

Gemballa1980 · 06-26-2013, 12:10 AM

Quote:

Originally Posted by 1911A145

Look's "OK" , but Can you PLEASE get a data log starting in erd gear @ 2k rpm and go to reline and then end the log. do the same in 4th. make sure you log both LTFT's banks. as well.

Thanks.

Will do... Thanks for the tip!

yawn · 06-26-2013, 05:29 AM

I've also noticed too that on sudden lift-off of the gas (gear change), there is now a distinct sound happening - my DVs? Wasn't aware they made noise since they're not venting to the atmosphere.... Can hear it right in the cabin, and it's loud - wasn't there before. I seem to be hitting 18psi. That ok?

135Pats · 06-26-2013, 08:08 AM

Quote:

Originally Posted by sharkatron

I've also noticed too that on sudden lift-off of the gas (gear change), there is now a distinct sound happening - my DVs? Wasn't aware they made noise since they're not venting to the atmosphere.... Can hear it right in the cabin, and it's loud - wasn't there before. I seem to be hitting 18psi. That ok?

If you suddenly let off high load, the DVs will make some noise for sure. If its like a Synapse or HKS bov, then something could be up. Check codes if you have a boost leak.

Jcrewsn · 06-26-2013, 02:59 PM

^^DVs for sure

Where can I find any info about Meth maps? Anything yet?

135Pats · 06-26-2013, 08:08 PM

Quote:

Originally Posted by Jcrewsn

^^DVs for sure

Where can I find any info about Meth maps? Anything yet?

No such thing as a Cobb OTS meth map, if thats what you mean. Race/e30 has the most aggressive timing available.

yawn · 06-26-2013, 10:40 PM

Quote:

Originally Posted by 135Pats

Quote:

Originally Posted by sharkatron

I've also noticed too that on sudden lift-off of the gas (gear change), there is now a distinct sound happening - my DVs? Wasn't aware they made noise since they're not venting to the atmosphere.... Can hear it right in the cabin, and it's loud - wasn't there before. I seem to be hitting 18psi. That ok?

If you suddenly let off high load, the DVs will make some noise for sure. If its like a Synapse or HKS bov, then something could be up. Check codes if you have a boost leak.

Thanks for confirming - I just wondered why they got so much louder.

yawn · 06-27-2013, 03:03 AM

Ah yeah, also noticed under WOT, the car has a tendency to want to squirm. I really have to concentrate to hold the wheel straight. And no, I don't think the car is skidding as such - I don't notice the lights flickering or anything like that. Just feels.... dangerous? Would improving my suspension fix this?

JHOOPS2 · 06-27-2013, 08:18 AM

Quote:

Originally Posted by sharkatron

Ah yeah, also noticed under WOT, the car has a tendency to want to squirm. I really have to concentrate to hold the wheel straight. And no, I don't think the car is skidding as such - I don't notice the lights flickering or anything like that. Just feels.... dangerous? Would improving my suspension fix this?

Yes. Also, check you wheel bearings and make sure everything is up to spec.

yawn · 06-27-2013, 04:12 PM

Quote:

Originally Posted by JHOOPS2

Quote:

Originally Posted by sharkatron

Ah yeah, also noticed under WOT, the car has a tendency to want to squirm. I really have to concentrate to hold the wheel straight. And no, I don't think the car is skidding as such - I don't notice the lights flickering or anything like that. Just feels.... dangerous? Would improving my suspension fix this?

Yes. Also, check you wheel bearings and make sure everything is up to spec.

Thanks!

2kredz3 · 06-28-2013, 10:04 AM

Did a fast pull last night after getting ready for the track and laid down 335hp/425tq

stage 1 aggressive map
AFE Intake
Amsoil Fluids through out the car

Not making power above 5.5K, obvious the stock down pipes are a huge restriction. ;-)

Thanks Cobb for a great product!

Kelly

Jcrewsn · 06-29-2013, 01:01 PM

Quote:

Originally Posted by 135Pats

No such thing as a Cobb OTS meth map, if thats what you mean. Race/e30 has the most aggressive timing available.

If I still wanted to run Cobb with meth...anything I can do? I've heard that there are Cobb tuners, is that something they'd be able to help with?

135Pats · 06-29-2013, 03:59 PM

Quote:

Originally Posted by Jcrewsn

If I still wanted to run Cobb with meth...anything I can do? I've heard that there are Cobb tuners, is that something they'd be able to help with?

Protune it or learn ATR and make a map your self. At the most basic level, the meth will cool the charge air and add octane. So the primary benefit from the tuning side is more aggressive timing, but a proper protune will obviously account for much much more.

Jcrewsn · 06-29-2013, 04:23 PM

Quote:

Originally Posted by 135Pats

Protune it or learn ATR and make a map your self. At the most basic level, the meth will cool the charge air and add octane. So the primary benefit from the tuning side is more aggressive timing, but a proper protune will obviously account for much much more.

Thanks for the help!

Rob HT · 06-30-2013, 12:29 PM

Great sight that has wealth of info guys! I p/u a '98 135i last month. Up to this point all of my exp has been w/American V-8s. My question - is the Snow Performance Water/Methanol Injection compatible with the Cobb Tuning?

06-25-2013, 02:00 AM	#1651
yawn Lieutenant 57 Rep 552 Posts Drives: M2 Competition Join Date: Mar 2012 Location: Home iTrader: (0)	So finally installed Stage1+ and decided see what kind of a difference the tune makes. Took her out for a bit if a drive and noticed a few things: On one or two pedal to the metal runs, I noticed a slight surge in acceleration after lift-off. As I understand, others have experienced this issue, but, any resolution to this? Could be quite dangerous if you take your foot off to start to slow down, only to have the car accelerate for a split second more. Doesn't happen every time, but then again, all it takes is to be at the wrong place at the wrong time... Also, I noticed from inside the cabin, there is a more metallic drone under acceleration now. This was definitely not there prior to the tune. Any thoughts guys? Something that wasn't loud before has become much louder. Definitely happy with the added power the car has now - acceleration is much greater lower in the rev range. However, there is now a lack of smoothness in the delivery of this power. Guess a pro-tune should help fix this eh? Overall though, you could say I'm a happy camper with the tune Thoughts appreciated! EDIT: was just mulling over the "surge in acceleration after lift-off" issues - could it be that it just takes time for the car to adapt? Last edited by yawn; 06-25-2013 at 02:37 AM.. Reason: Afterthought
	Appreciate 0 Quote

06-26-2013, 05:29 AM	#1660
yawn Lieutenant 57 Rep 552 Posts Drives: M2 Competition Join Date: Mar 2012 Location: Home iTrader: (0)	I've also noticed too that on sudden lift-off of the gas (gear change), there is now a distinct sound happening - my DVs? Wasn't aware they made noise since they're not venting to the atmosphere.... Can hear it right in the cabin, and it's loud - wasn't there before. I seem to be hitting 18psi. That ok?
	Appreciate 0 Quote

06-26-2013, 02:59 PM	#1662
Jcrewsn First Lieutenant 12 Rep 369 Posts Drives: 2009 BMW 135i Join Date: May 2009 Location: North Tustin, CA iTrader: (0) Garage List 2009 135i Sport [0.00]	^^DVs for sure Where can I find any info about Meth maps? Anything yet?
	Appreciate 0 Quote

06-27-2013, 03:03 AM	#1665
yawn Lieutenant 57 Rep 552 Posts Drives: M2 Competition Join Date: Mar 2012 Location: Home iTrader: (0)	Ah yeah, also noticed under WOT, the car has a tendency to want to squirm. I really have to concentrate to hold the wheel straight. And no, I don't think the car is skidding as such - I don't notice the lights flickering or anything like that. Just feels.... dangerous? Would improving my suspension fix this?
	Appreciate 0 Quote

06-28-2013, 10:04 AM	#1668
2kredz3 Mod Squad Motorsports 3 Rep 36 Posts Drives: 135i M Sport 6MT Join Date: Jun 2013 Location: Tyrone, Ga iTrader: (0)	Did a fast pull last night after getting ready for the track and laid down 335hp/425tq stage 1 aggressive map AFE Intake Amsoil Fluids through out the car Not making power above 5.5K, obvious the stock down pipes are a huge restriction. ;-) Thanks Cobb for a great product! Kelly
	Appreciate 0 Quote

06-30-2013, 12:29 PM	#1672
Rob HT New Member 0 Rep 10 Posts Drives: 2008 135i Join Date: Jun 2013 Location: Temecula, CA iTrader: (0)	Great sight that has wealth of info guys! I p/u a '98 135i last month. Up to this point all of my exp has been w/American V-8s. My question - is the Snow Performance Water/Methanol Injection compatible with the Cobb Tuning?
	Appreciate 0 Quote