Anyone having good luck with AEB BT SW? having ALOT if issues with this UNI BT file

[4inchMAF]

im not making this thread to bash Unitronic or anything...just looking for some insight......

my car was running absolutely PERFECT before i sent my ECU out to Unitronic. i mean, it ran FLAWLESSLY!!! not one problem for YEARS!!!the very second i reinstalled the newly flashed ECU the car went to HELL!!!! i loved this car before i sent the ECU in. now i just want to

*first i HAD to do a throttle body adaption because the car wouldnt even idle past 500 RPM. ive done about 4 now

*at the same time re-installed the newly flashed ECU i lost function of my coolant temperature gauge and oil temp gauge

*it mis-fires everyday here and there (twice i had to pull over it was so bad)

* i put it on the dyno and it ran SOOOOOOOOO rich no one could believe (9.5:1 AFR) thus making it so the car couldnt even make any power.

*my MAF sensor quit working as it used to. it reads a little low now (which, ironically should make me run lean)

*if i really step on it...it get RICH!!!


car is a 1998 Audi A4 AEB quattro

GT28RS Eliminator
Unitronic 440cc File
ATP 3"inlet
Kinetic high flow manifold
3" DP to 2 1/2" catback
Delphi 440's
3 bar FPR
3" MAF housing with 1.8t sensor

Anyway, when driving home tonight it started misfiring REALLY badly!!!! like, some SERIOUS misfiring (these are Brand New plugs...50 miles on them this is my 3rd set since putting this ECU in 2 weeks ago ). i pulled over and turned the car off. when i tried to start it again it just misfired like crazy!!! after a few tries to start the car i gave up.... it wouldnt start again.there have been all these other issues since installing the ECU, but now my car is DEAD!! i called AAA:



i dont even know where to start about this most recent issue (the serious misfiring), so i pulled the plugs...these are 2 days old with about 45 miles on them (the others ive replaced have been BLACK as hell!!!:



ever since i installed this ECU, the car's been misfiring, but it went nuts tonight.

i had ALOT better luck with REVOs 440cc file!!! (which isnt saying much) its just odd that i install this ECU on a car that worked ABSOLUTELY PERFECT in EVERY way!!! ever since i installed it, the car is just worthless.......

the DYNO:


after the first pull at 20 PSI we were all STUNNED to see 218AWHP and 218TQ.
then we looked down and saw that the AFR was LESS than 10:1!!! (about 9.5!!!!)

the next few pulls were all the same. SUPER rich after about 4500 rpm. ive never seen AFRs this low for as long as ive been on this forum.

anyone know why the AFR would go from being OK before 4500 rpm to just going rich as f@#k? i dont get it. i have all the correct hardware for the tune BTW.

i was thinking about 260 to 270awhp would be about right.... needless to say, im frustrated here.






i dynoed again on friday with the same results ( just lower intake temps.....)

any help would be great... if you read this far... THANKS!!!!

[B00sted20VUSP]

Wow!!! im suprised you made that much power with 9.5:1 AFR's. Obviously it must be related to what unitronic did, I would send them the ECU back and have the re-check the file they loaded. Other than that i cant see anything else if the car ran fine before. Cyl 1&4 look horrible, unless the injectors are sticking open on 1&4 at high RPM?

[Poopie]

do you have any logs?

[mike-2ptzero]

car is a 1998 Audi A4 AEB quattro

GT28RS Eliminator
Unitronic 440cc File
ATP 3"inlet
Kinetic high flow manifold
3" DP to 2 1/2" catback
Delphi 440's
3 bar FPR
3" MAF housing with 1.8t sensor


i have all the correct hardware for the tune BTW.

Odd seeing that on the Uni web site they list the BT file for a 1998 as

BT-415cc

415cc Injectors @4bar

Designed to run a 4Bar FPR on a GT28xx family turbo, preset at 20-21 PSI on N75 requires a Audi TT225 or VR6 OBDII MAF Housing

To me that list just doesn't seem to match up to yours.

[djwimbo]

Odd seeing that on the Uni web site they list the BT file for a 1998 as

To me that list just doesn't seem to match up to yours.

While that's true, there's other versions of the file.

BUT 440's @ 3bar will flow less than 415's @ 4Bar. 440cc vs ~480cc. That shouldn't account for the wicked rich conditions.

Have you contacted Unitronic with your situation? I'm curious since you have issues with two of your gauges and misfires. It could be an ECM problem, or a connection issue. Have you looked at the connections to the ECM? or tried a passive discharge of the system?

[mike-2ptzero]

He really needs to do some logs with a vagcom. Something is causing the ecu to dump fuel after 5k rpms.

[4inchMAF]

He really needs to do some logs with a vagcom. Something is causing the ecu to dump fuel after 5k rpms.

any ideas on this? anyone know of a scenario or two that could cause the AFR drop so much only after 5k?

Have you looked at the connections to the ECM? or tried a passive discharge of the system?

what is a 'passive discharge"?

Odd seeing that on the Uni web site they list the BT file for a 1998 as





To me that list just doesn't seem to match up to yours.

i know. they really need to update that.....

[eurotecknik]

Hi Biggie Talls. It is irronic that you made this thread cuz I was gonna do that last night about the same tipic. I have the same issue with my car. I have run the setup in my seg for 4 months now with no problem. So, I dont think it could be my software but maybe. This is the first time having a major problem with this car. Random/Multiple Misfires and cylinder 2 and 4 misfires.
Address 01: Engine Labels: None
Part No: 4B0 UNI 018 BT
Component: 1.8L R4/415 G 0001
Coding: 16201
Shop #: WSC 12338
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-10 - - - Intermittent
16686 - Cylinder 2: Misfire Detected
P0302 - 35-10 - - - Intermittent
16688 - Cylinder 4: Misfire Detected
P0304 - 35-10 - - - Intermittent

I have searched and read about 70 topic related threads. I have new Revision R from ECS tuning coils installed. New spark plugs. Afted 4 months use my old ones dont look as bad as 4inchMAF's. I have moved around coils so see it misfire possision changes but it stayes at 2 & 4. I cannot pass 3000 RPM at WOT. Cel starts blinking and car loosed power BADLY I know my car in and out (not saying I am an expert) I have installed my turbo and everything else on my sig. Oh, yeah and I do have FMIC although not listed. the car is 2001 A4 1.8T. So, WHAT COULD IT BE people? I am very pesimistic about this. Help me and 4inchMAF please. In a couple of days I and going to CPT in chicago if I cant fix by then. Also, I don't have ICM for those who were goind to say that.
Possible Causes:
Wiring to coilpack/injectors = checked look ok.
Camshaft position sensor = I don't know symptom related?
Fuel injectors = Genesis 415cc istalled at BT install.
Fuel pump = stock for now possibility?
EVAP canister purge valve = I dont know about that?
Low compression = checked: cylinder 4=175 cylinder 2= about 165
Evaporative emission system = checked hoses and wire looks ok
Controle Module damaged = I dont know about that.

Any thoughts?

[MultiAudis]

I cannot pass 3000 RPM at WOT. Cel starts blinking and car loosed power BADLY

When I had this problem, my MAF was the culprit

[djwimbo]

A passive discharge is disconnecting both battery terminals from the battery and touching them together for 2-3 minutes. It's called a passive discharge b/c it drains all the power out of all the capacitors and other components in the electrical system.

It's worth a shot, I've had it help out on some really weird stuff before. It might fix your gauges.

[4inchMAF]

A passive discharge is disconnecting both battery terminals from the battery and touching them together for 2-3 minutes.

this wont hurt anything?

also, anyone know of why a car would would have OK AFRs until a cretain point (say...5000 RPM) then just go rich as f#@k?

[Poopie]

bad o2 sensor possibly

[mike-2ptzero]

bad o2 sensor possibly

02 sensor doesn't do anything while at WOT on the narrow band cars. Plus the AFR is perfect up to 5k rpms where it all goes south.

[Poopie]

well thats assuming the Throttle body and MAF are working correctly. Hes had issues with both throttle bodies and MAF so there could be a lot of things wrong.

[djwimbo]

this wont hurt anything?

also, anyone know of why a car would would have OK AFRs until a cretain point (say...5000 RPM) then just go rich as f#@k?

Nope, it won't hurt anything as long as both terminals are disconnected from the battery.

The only thing I can think of that software would have to do with is if you have the wrong tune. Only b/c it goes way rich @ ~5K, like it's expecting more air to be flowing. I don't really think that's the case though, I'm thinking it's another issue.

Is the MAF 3" internal or external? and what's "normal" readings for your turbo/file? On a '98 I'd have a hard time believing that it's a throttle body related issue unless it's the TPS.

[Toyotatech]

Coolant temp sensor? Throwing it out there.

[Don Supreme]

hmmmm...

Curious have you swapped the CTS yet? It was suggested to you on vortex and also by the poster above.

[djwimbo]

It is a possibility, I wouldn't think that's the issue, but it's possible. In Closed loop that is the primary sensor for fueling needs.

[4inchMAF]

hmmmm...

Curious have you swapped the CTS yet? It was suggested to you on vortex and also by the poster above.

yes. its new

[eurotecknik]

When I had this problem, my MAF was the culprit

Tonight I unplugged the MAF harness and right away the car was able to pull after 3K and no blinking cel anymore. It wasn't perfect but ALOT A LOT better. I guess the MAF would fix the problem. I can't believe the MAF took a shit only after 4 months . Although, I drove 700 highway miles on a Signal too low cel cuz the green wire going to the maf sensor was unplugged.

[GetBoosted84]

I have some log files posted on my thread for my Unitronic BT-415cc file running with a GT2860RS, genesis 415cc injectors @ 4 bar, MAFless also.

Link (MAFless file logs):
http://www.audizine.com/forum/showthread.php?t=252234

Also, here are some logs when I did a run with the MAF (OEM sensor in TT225 Housing ~2.75" ID):
http://plainbored.com/files/logs/Uni...1%20(Data).JPG
http://plainbored.com/files/logs/Uni...20(Graphs).JPG

[AudiA4_20T]

I have some log files posted on my thread for my Unitronic BT-415cc file running with a GT2860RS, genesis 415cc injectors @ 4 bar, MAFless also.

Link (MAFless file logs):
http://www.audizine.com/forum/showthread.php?t=252234

Also, here are some logs when I did a run with the MAF (OEM sensor in TT225 Housing ~2.75" ID):
http://plainbored.com/files/logs/Uni...1%20(Data).JPG
http://plainbored.com/files/logs/Uni...20(Graphs).JPG

But you have ME7... this is different from his ME5. He can't unplug the MAF ( dont believe he can at least) because thats all the car has to run off of

[GetBoosted84]

But you have ME7... this is different from his ME5. He can't unplug the MAF ( dont believe he can at least) because thats all the car has to run off of

Yeah that's true. That's why I included the logs from me using the MAF as input also. Figured that could give him a good idea of where my car is at with the MAF and it might help him out.

[Toyotatech]

But you have ME7... this is different from his ME5. He can't unplug the MAF ( dont believe he can at least) because thats all the car has to run off of

The car will run in open loop without the maf unless mine car is special.

[offroader1006]

do you not have another car to swap the ECM into to see if the problems follow the ECU?

i'll try it if you ship it to me. since you know im not gonna rip you off, lol.

[offroader1006]

The car will run in open loop without the maf unless mine car is special.

it should, i dont see how closed loop is possible without the MAF(on a non MAP car)

[////D]

holy shit thats my old car!

[eurotecknik]

I have some log files posted on my thread for my Unitronic BT-415cc file running with a GT2860RS, genesis 415cc injectors @ 4 bar, MAFless also.

Link (MAFless file logs):
http://www.audizine.com/forum/showthread.php?t=252234

Also, here are some logs when I did a run with the MAF (OEM sensor in TT225 Housing ~2.75" ID):
http://plainbored.com/files/logs/Uni...1%20(Data).JPG
http://plainbored.com/files/logs/Uni...20(Graphs).JPG

Thanks for the logs. I will compare once the new MAF is in.
By the way I'm bought the MAF from www.mjmautohaus.com part #071906461B. I will see if they will refund or give me another maf. For time being stealership is my only friend. At lease I can exchage it ther if it goes bad for sure.

[Side-Step]

That is why I went with Kevin's Lugtronics. Its a plug and play standalone system.

[mike-2ptzero]

The car will run in open loop without the maf unless mine car is special.

The ECU still doesn't use the 02 sensor at WOT when the maf is unplugged, it just goes straight off of the programmed fuel/timing maps. So if the fuel map is programmed to run rich and the ecu uses the maf sensor to pull fuel back, expect the car to run rich when the maf is unplugged.

[4inchMAF]

when i unplug the MAF the car idles (if you can call it that) between 350 and 500 RPM....

put it on a dyno again last night for a free pull...same deal. new O2 sensor and CTS since last time. lower intake temps.....

Unitronic said they think its because (get this) im not using Green Top 440's....

[GetBoosted84]

I cannot imagine the spray pattern being different accounting for and of the issues you are running into.

[4inchMAF]

i used to own i set of green tops in my 50 trim GTI...they were awful..... but if theyre saying the file was written exclusively for the green tops, maybe i should put a set in to see if anything changes?

and he was saying it wasnt the spray pattern that might be the issue, but the duty cycle between the two injectors varies somewhat....

im just afraid if nothing changes, il be stuck with a set of injectors no one wants

[gmx]

...

[4inchMAF]

LOL

[mike-2ptzero]

i used to own i set of green tops in my 50 trim GTI...they were awful..... but if theyre saying the file was written exclusively for the green tops, maybe i should put a set in to see if anything changes?

and he was saying it wasnt the spray pattern that might be the issue, but the duty cycle between the two injectors varies somewhat....

im just afraid if nothing changes, il be stuck with a set of injectors no one wants

Still dont think that would cause your injectors to just dump fuel like crazy. Pretty sure most injectors on the market are pretty much the same, only difference being the spray pattern and resistance(High or Low)

[4inchMAF]

another thing real quick...

i was using a modified VR6 housing with the 1.8t sensor in it (i say modified because, as most of you guys familiar with the AEB know, the AEB sensor screws in 90* differently from the more modern 1.8Ts and it is just bigger)...

i just put the sensor in this purpose built 3" mAF housing made to fit the AEB sensor... is the sensor sitting too low in this new housing? i didnt know if the sensor should be closer to the middle of the housing...or if it even matters that much.

[mike-2ptzero]

There are 2 different versions of the VR6 housing, IIRC one of them allows the stock AEB sensor to sit in correctly.


BTW your picture looks to be just a standard tube housing like ATP sells and it has no flow straightner.

[GetBoosted84]

Could be turbulence in the intake caused by not having the air straightener or being too close to the filter also.