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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > All COBB Tuning AccessPORT Flash for N54 335i Discussion Here



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      03-09-2012, 12:52 PM   #4247
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Quote:
Originally Posted by dzenno View Post
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.

Dzenno, every once in a while I get timing drops on Cylinder 2 or 5(5 more often). then timing recovers and rejoins (value wise) the rest of the cylinders. I didn't get those before though. I used to log a lot (same map) and never got those dropouts before. could it be a hardware related issue (wear on some injector for instance)? I'm running S2 sport (92oct). Weather in the NW is cold
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      03-09-2012, 12:59 PM   #4248
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Quote:
Originally Posted by dzenno View Post
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.
Thanks for the info Dzenno
I guess I should've said "occasional mild timing pulls/corrections" lol
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      03-09-2012, 01:06 PM   #4249
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Quote:
Originally Posted by rader1 View Post
Thanks for the info Dzenno
I guess I should've said "occasional mild timing pulls/corrections" lol
yeah and is almost always cyl 5 or 2. If cyl 1 starts pulling you can be certain all of the rest are pulling as well massively.
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      03-09-2012, 01:17 PM   #4250
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Quote:
Originally Posted by enrita View Post
yeah and is almost always cyl 5 or 2. If cyl 1 starts pulling you can be certain all of the rest are pulling as well massively.
hey Enrita, can you check post 4282#

do you think it can be a hardware related issue when it's mostly cylinder 5 timing drop and its every once in a while?
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      03-09-2012, 01:20 PM   #4251
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Quote:
Originally Posted by marv85 View Post
hey Enrita, can you check post 4282#

do you think it can be a hardware related issue when it's mostly cylinder 5 timing drop and its every once in a while?
than is fine, see dzenno post. just think about piggybacks where only cyl 1 is monitored.
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      03-09-2012, 01:20 PM   #4252
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Quote:
Originally Posted by enrita View Post
yeah and is almost always cyl 5 or 2. If cyl 1 starts pulling you can be certain all of the rest are pulling as well massively.
I don't understand one thing: as far as I know, there are only two detonation sensors attached on this engine. How can the ECU independently pull timing on certain cylinders if there are no per-cylinder detonation sensors ?
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      03-09-2012, 02:12 PM   #4253
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Quote:
Originally Posted by tscdennab View Post
I don't understand one thing: as far as I know, there are only two detonation sensors attached on this engine. How can the ECU independently pull timing on certain cylinders if there are no per-cylinder detonation sensors ?
Because there are several ways the N54 monitors detonation/knock.
One is the traditional knock sensors, another is the fuel injectors also function as knock sensors and the DME monitors the CPS for crank acceleration and if something is off it is able to determine which cylinder by comparing crank position and firing order.
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      03-09-2012, 02:18 PM   #4254
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Send a message via AIM to themyst
Cylinder 5 is notoriously "knocky" on my car too.
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      03-09-2012, 02:45 PM   #4255
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I hooked up a battery charger this morning and went through the process. Probably didn't need the charger, but just to be safe. I never knew there was an easy access positive terminal under the hood! I'd always assumed I'd need to dig into the trunk to get at the battery connectors.

The process went exactly as described, dash lights and nav screen flicker lots of warnings, during both the save/backup and flash process and everything clears up at the end. No hiccups or issues in the process. The simple instructions are 100% clear.

I've had a few short trips now, probably 45 minutes of driving. After allowing warm up, I let the car adapt without pushing hard for a while. After three quick trips, and a couple opportunities to pass quickly, I am very impressed.

I chose the Stock Throttle, Stage 1, Sport 3.01. I have 93 octane, so I'll switch to the aggressive map soon.

I don't think this could be more polished or painless if it were offered by BMW. This fits my needs precisely, real power increase without fuss.

Nice job Cobb. I'll post again as I learn more.....
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      03-09-2012, 02:48 PM   #4256
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Get the Beta v400 maps! They are a step up!!
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      03-09-2012, 02:53 PM   #4257
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I look forward to being able to flas my car to the V400, I really feel my car lacking power down low
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      03-09-2012, 03:02 PM   #4258
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Quote:
Originally Posted by BmwFanny View Post
I hooked up a battery charger this morning and went through the process. Probably didn't need the charger, but just to be safe. I never knew there was an easy access positive terminal under the hood! I'd always assumed I'd need to dig into the trunk to get at the battery connectors.

The process went exactly as described, dash lights and nav screen flicker lots of warnings, during both the save/backup and flash process and everything clears up at the end. No hiccups or issues in the process. The simple instructions are 100% clear.

I've had a few short trips now, probably 45 minutes of driving. After allowing warm up, I let the car adapt without pushing hard for a while. After three quick trips, and a couple opportunities to pass quickly, I am very impressed.

I chose the Stock Throttle, Stage 1, Sport 3.01. I have 93 octane, so I'll switch to the aggressive map soon.

I don't think this could be more polished or painless if it were offered by BMW. This fits my needs precisely, real power increase without fuss.

Nice job Cobb. I'll post again as I learn more.....
Enjoy the car

log a couple of runs to make sure everything is in check
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      03-09-2012, 03:03 PM   #4259
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here's my very short review of the v400 map, it's a combination of stock throttle map and linear throttle (like somewhere in the middle). the power is there when you push it, however it's so butter smooth with normal crusing. it's nice to know this v400 has more power from the previous maps too.

i had the ap since day 1 when they came to bmw scene and i have to say v400 is the best one for me so far.

good job Cobb!
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      03-09-2012, 03:45 PM   #4260
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Quote:
Originally Posted by crypticc
Hi, so equipped with v4.00 which is pulling smoother and more like the original stock linear N/A feeling, just 'more'.

Since I got the cobb though I've read about 'pulling timing'.

Is that what I have here, or is this just mistiming introduced to impart a burble and rortiness into the engine note? The engine became naughtier sounding a few years ago when my WG upgrade was done and I'd assumed that some new bmw software deployed at that time introduced that, but this seems to be a COBB thing too.

Anyhow, no codes or anything, and otherwise happy.

See attached for a various second and third gear pulls.

Is this normal?

Cheers
Chris

P.m. forgot to add, keen to know before I start chucking LSD and suspension onto the car. Cheers
Hi. I would really appreciate your view point of the logs I attached. They're not the cleanest but I don't want to trouble Cobb themselves if there's nothing wrong and I don't really know what I am looking for.
Thank you



edit: added some 'cleaner' logs with comments.
Attached Files
File Type: zip datalog summary 2.zip (40.8 KB, 36 views)

Last edited by crypticc; 03-09-2012 at 08:24 PM. Reason: edit: added some 'cleaner' logs
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      03-09-2012, 04:46 PM   #4261
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Thanks for the quick replies after my thermostat issue, the codes p0128 that appeared while running my cobb tune turned out to be a stuck open thermostat. While 2 weeks ago the electric water pump went. BMW went and changed under warranty. So Cobb is getting reinstalled later today.
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      03-09-2012, 06:13 PM   #4262
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am I the only person having a hard time finding the v4 beta maps?
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      03-09-2012, 06:20 PM   #4263
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disregard
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      03-09-2012, 06:52 PM   #4264
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Quote:
Originally Posted by poloace View Post
am I the only person having a hard time finding the v4 beta maps?
If you had trouble, others may as well. Please find the maps here:
http://www.cobbtuning.com/BMW-Access...s/bmw/bmw-grid

Click on the BETA button to get to the v400 mapping.

Cheers,
Rob
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      03-09-2012, 07:57 PM   #4265
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Hey Rob, i sent you an email a few hours ago... Please check when you get a chance, thank you!
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      03-10-2012, 02:00 AM   #4266
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just tested the maps jason sent me and the problems all worked out enjoying the smoother map and the outstanding service thanks
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      03-10-2012, 02:36 AM   #4267
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Quote:
Originally Posted by poloace View Post
am I the only person having a hard time finding the v4 beta maps?
Quote:
Originally Posted by Rob@Cobb View Post
If you had trouble, others may as well. Please find the maps here:
http://www.cobbtuning.com/BMW-Access...s/bmw/bmw-grid

Click on the BETA button to get to the v400 mapping.

Cheers,
Rob
I also can not find the BETA button..??
But here is a link i found a few pages back.. http://www.cobbtuning.com/AccessPORT...aps%2Fbmw-grid
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      03-10-2012, 03:36 AM   #4268
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I'm sure that there is no red beta button on my screen..

Last edited by Simon76; 03-10-2012 at 03:44 AM.
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