[dzenno]

I'm trying to troubleshoot a small issue on my car, basically I see bank2 always starts to lean out under WOT by about 0.5-0.7 AFR than bank1. This isn't serious as I have bank2 even at its leanest running at 12.2 AFR which is great...really what I'm after is to try to see if I can resolve this sort of a mystery...all my injectors were changed 1.5 years ago together...AFR imbalance is always consistent under WOT, and starts happening above 5500rpm to about 6500rpm...most likely this is a non-issue but I'd like to try a few things...

Now, can anyone explain with any level of detail how easy/hard it is to swap a fuel injector from one cylinder to another..is it as simple as swapping a coil? I know coding at the dealer has to be done for a brand new injector but if I'm swapping banks is this still required?

I'm getting an Innovate LC-1 wideband hooked into bank2 and wired into Procede this weekend to have a clear picture of AFR in that bank...will probably add one for bank1 later as well once Shiv frees up another 0-5V analog input on the procede...

[enrita]

you need to recode them no matter what. Does this happens no matter how much boost you are running?

[dzenno]

You're 100% on that?? Will have to do more testing to see how exactly it relates to boost but from what I've seen so far it starts to happen at around 15-16 psi pump 94 gas..This is why I was asking for 15-16 psi runs on upgraded turbos from you on pump (no meth)...

[tscdennab]

Originally Posted by dzenno

You're 100% on that??

The ECU needs to be told the injector code for each cylinder, such that it adjusts the current opening the injector according to it's factory tolerance. Maybe you messed up the injectors before, without coding ?

The best thing you could do first is to re-code all the injectors: go to a service, read the injector codes and enter them correctly into the ECU.

[enrita]

Originally Posted by dzenno

You're 100% on that?? Will have to do more testing to see how exactly it relates to boost but from what I've seen so far it starts to happen at around 15-16 psi pump 94 gas..This is why I was asking for 15-16 psi runs on upgraded turbos from you on pump (no meth)...

Will do tomorrow some 3rd / 4th gear pulls on UT55 DIC2-14 maps on Shell 94 octane. Will post them on the thread.
I am as well going to check all injectors are coded correctly since the shop that rebuilded my engine might have missinstalled some during the rebuild. You dont need to go to BMW. My shop coded successfully Mini Cooper injectors so it should work for ours as well.

[mycoupe]

Could just be that you need to send them outfor blueprinting??? Will be interesting to see what you find out. GL and let us know.

[dzenno]

Originally Posted by enrita

Will do tomorrow some 3rd / 4th gear pulls on UT55 DIC2-14 maps on Shell 94 octane. Will post them on the thread.
I am as well going to check all injectors are coded correctly since the shop that rebuilded my engine might have missinstalled some during the rebuild. You dont need to go to BMW. My shop coded successfully Mini Cooper injectors so it should work for ours as well.

UT55 on pump 94 gas should show a slight imbalance (0.5AFR) past 5300rpm if its fueling related...just trying to confirm which it could be...my front O2 sensors are brand new so I know 100% that's not the cause..

Originally Posted by mycoupe

Could just be that you need to send them outfor blueprinting??? Will be interesting to see what you find out. GL and let us know.

Blueprinting? Explain please..


I've been told that a 0.5AFR imbalance is not to worry about and I'm not, I'm more puzzled by it as to why its happening especially given the consistency that bank2 is the one that always runs leaner by 0.5...adding more fuel by changing the map (tuning) makes the imbalance way less visible though but when this is done the car dips down into high 11s lower than 5300rpm and then splits, bank1 stays lower (11.5-12) AFR to redline, bank2 goes up from 11.7-12.5 at redline..makes me think there might be unmetered air going past the vband clamp on the bank2 (rear) turbo exhaust manifold maybe "skewing" AFR by 0.5..could that be the case even?

[dzenno]

Does a GT1 scan tool offer this injector coding feature? Wish I bought that instead of bav tech ... $450 for that vs $280 for BT but with a ton more features including, I think, injector coding

[jpsimon]

pretty sure a GT1 can't do this. A shop needs an Autologic system at least. I had a VERY hard time finding a shop that could do this (only found one somewhat close to me), and in the end they wanted to charge me as much as the dealer.

[only1]

i believe the gt1 does injector coding along with every other feature we need for our cars. I too regret having the BT, it's not that capable at all.

[BoostedE90]

I know there was a thread going to get members to email Bav Tech to persuade them to add injector coding/calibration to the tool, but I think BT backed out.

Found it: http://www.e90post.com/forums/showthread.php?t=459918

[dzenno]

Originally Posted by jpsimon

no pretty sure a GT1 can't do this. A shop needs an Autologic system at least. I had a VERY hard time finding a shop that could do this (only found one somewhat close to me), and in the end they wanted to charge me as much as the dealer.

I actually think GT1 can do it..if you read through their docs you'll see ECU flashing and coding...this isn't something supported by BT...wish I got the GT1 back then..I like it but GT1 seems to have a ton more features including a full TIS

I'll call a few places and see what they say...hopefully I'm lucky and my injectors have matching tolerance numbers so to just swap around to test something like this wouldn't require recoding

[jpsimon]

I ran into this issue when I was trying to figure out what to do. this was from my original thread:

Originally Posted by scalbert

Not even the GT1 can code injectors which is why it has been a delear only issue. There are two parts to this. BT has cracked it but hasn't added in this feature yet for petrol engines. Appearently the values are coded and what is sent to the DME isn't what is written on the injector. It has to be translated and then written to the DME.

Originally Posted by vasillalov

True!

Just to clarify, the reason why the injectors have to be coded into the DME is because they are what BMW considers precision instruments. Basically, the injectors have a piezo-electric component inside of them. Piezo-electric elements have different tolerances. So basically, due to manufacturing, each injector will have different tolerances in the piezo-electric component inside it. When the injector comes off the assembly line, it is put through various tests to make sure its working fine. Some of these tests determine those exact tolerances I am talking about. Then these tolerances which are different for each injector, get recorded onto the plastic of the injector.

When an injector needs to be replaced, the DME must be told that those tolerances are. Otherwise, the DME will simply use the previously known values of the previous injector and its own tolerances and the new injector won't work as expected.

Unfortunately, the DME is not capable of determining those injector tolerances on its own. So a trip to the dealer is necessary to recode the injectors.

I am really hoping BavTech tool will offer this soon.

The only shop that actually said they could help me had an Autologic system. I would love to be proven wrong, but I have found no proof that a GT1 can actually do this specific function.

[tscdennab]

My dealer told me that GT1 is capable to do almost everything (not for the late Fxx models though) but I was under the impression that it costs $1000+ ?

[jpsimon]

Originally Posted by tscdennab

My dealer told me that GT1 is capable to do almost everything (not for the late Fxx models though) but I was under the impression that it costs $1000+ ?

At the dealer it costed me $1000 for them to replace 3 injectors + code them (that includes the price of the injectors).

[BoostedE90]

Originally Posted by tscdennab

My dealer told me that GT1 is capable to do almost everything (not for the late Fxx models though) but I was under the impression that it costs $1000+ ?

Look like it's around $450.
http://www.xcar360.com/bmw-scanner-bmw-gt1-sss-dis.html

$1000 for the dealer to do 3 injectos? Damn... that's robbery!

[jpsimon]

I'd trust Scalbert, unless the gt1 has since been upgraded... don't just buy the gt1 thinking it will be able to code the injectors in.

[GeorgiaTech335coupe]

You need to code each injector as they have a different number for each one (tolerance issue). The GT1 can code the injectors. I know because it has been done on my car. On my 3rd set of injectors.

[shifterboy45]

dont swap the injectors without re-calibrating them. if you do, the injector will remember the old calibration figures (which are set per cylinder) and possibly give you more of an imbalance than you have now.

the injection system work off of a multi-pulse principle, all the fuel is not injected at one time, but rather in micro bursts. its more efficient and precise, making less emissions and not overwhelming the cylinder with too much fuel (which would then be deposited on the cylinder walls and scraped into the crankcase) diluting the oils' ability to perform.

blueprinting a injector is basically disassembly of the components and reassembly following very tight specs. sometimes improving performance, but most of all for consistency

believe me this is not like a coil swap --

[jpsimon]

Originally Posted by GeorgiaTech335coupe

You need to code each injector as they have a different number for each one (tolerance issue). The GT1 can code the injectors. I know because it has been done on my car. On my 3rd set of injectors.

well son of a bitch, where were you when I was first asking this!!! You saw 100% first hand that someone used a GT1 to do this? Why did shops tell me they couldn't do it.

i'm pissed.

[GeorgiaTech335coupe]

Originally Posted by jpsimon

well son of a bitch, where were you when I was first asking this! You saw 100% first hand that someone used a GT1 to do this? Why did shops tell me they couldn't do it.

i'm pissed.

Yes, 100%. I was watching it the entire time. A good friend of mine owns PSI in orlando and does all the work on my car. I've seen the GT1 calibrate injectors at least 4 times, when I was having misfire issues and we were changing out injectors 1 by 1.

$1000 for 3 injectors is robbery. They cost $130 each and can probably do 3 in 30 minutes if you know what you are doing.

[jpsimon]

Originally Posted by GeorgiaTech335coupe

Yes, 100%. I was watching it the entire time. A good friend of mine owns PSI in orlando and does all the work on my car. I've seen the GT1 calibrate injectors at least 4 times, when I was having misfire issues and we were changing out injectors 1 by 1.

$1000 for 3 injectors is robbery. They cost $130 each and can probably do 3 in 30 minutes if you know what you are doing.

I would have bought a GT1 and done this myself had I been told it was possible.. instead, everyone (including a shop with a GT1) told me it couldn't be done. what the fuck!!