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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 > Big Limp Issue.. Overboosted I think



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      04-10-2008, 05:38 PM   #1
rambino
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Big Limp Issue.. Overboosted I think

Well I was playing with the 2-26 V2 map, and for some reason, my car just doesnt make power with it.. Max boost it 14 at 3800 everything after than just dies down to like 9.. I tried a bunch of different TQ settings, but have had no luck.


I went back to the 12-26 map which works great, makes 14.5psi at 5500 rpms (93 tq values from 3000-6000) and the car runs strong and nice..

When I went to adjust the TQ settings just to tweak things, I noticed that only the middle values were adjustable and from like 6000 up its already at 100.. this is with the stock map..

I adjusted the middle values up to 97, I run 95 octane out here.. and dunn dunn dunn BIG MISTAKE..

Car boosted like fun, hit 14.5 across, but at 6500 it did a Massive Drop to 8 psi all of a sudden in third gear, i could feel a huge loss of power then it spikes back up..
I switched into 4th gear and at 5500 rpms i boosted 17psi!! ooops..(I didnt give it enough time to learn the new map, and I overdid the 5500 value im assuming..)

Car thru massive codes, Limp mode, Shuddering in engine.. Couldnt build any speed., was undriveable, car shut itself off at one point. I pulled over, Reset car, put back original values, and still NO LUCK.. car was Realllly angry.. Undriveable..

So i then reset the battery and the Big Major Half engine code disappeard and the car seems to be running fine again..

Problem is, my dash is still lit up with unhappy little codes showing faults in everything.. My code reader doesnt work since its a euro car..

so the question is.. If i made a big Limp appear by overboosting, will the dash stay lit, even though the car seems to be running fine again? Im assuming I have to goto the dealer and get these major codes cleared and that reseting the battery isnt enough in this case..... ive gone back down to my old settings and im pretty sure all is ok again otherwise.
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      04-10-2008, 06:02 PM   #2
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the first thing i would do in this case was to look if the high boost has caused any boostleek somewhere.
i have had overboost issues, and the codes disapered when i reset the battery, try it again.
Btw, i get codes in my codereader if there are any i my eurospec car.
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      04-10-2008, 06:11 PM   #3
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Quote:
Originally Posted by per View Post
the first thing i would do in this case was to look if the high boost has caused any boostleek somewhere.
i have had overboost issues, and the codes disapered when i reset the battery, try it again.
Btw, i get codes in my codereader if there are any i my eurospec car.
Well, I looked for a boost leak, and couldnt see any.. Maybe by the intercooler but im not sure, and honestly ill have this car 2 more months and if 12-26 map works ok, then im happy.. Maybe i do have one and thats why the 2-26 Map doesnt work, but then again, the Valet Map Shows Perfect boost, and without the Procede the car runs better than ever before..

The POS code reader i have, has No buttons.. It just plugs in, Says LAUNCH, does a count down and then starts over again.. I dont know how to reset anything, nor does it show any codes.. Ive tried it a million times,car on, car off, etc... I just think its not meant for my car.

As for the battery reset, Like i said I did this, and it cleared the Half engine Light, and allowed the car to be driveable again without the Massive Shuddering.. But the Warning lights are still there and i honestly think the dealer has got to reset them..
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      04-11-2008, 05:11 AM   #4
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Went to the dealer this morning.

DSC was Faulted and didnt work, Brake and Antilock system faulted and didnt work, over boost codes. etcc.. ton of mess..

They cleared them all and everything is ok now... So far.. lolz
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      04-11-2008, 07:32 AM   #5
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Quote:
Originally Posted by rambino View Post
Went to the dealer this morning.

DSC was Faulted and didnt work, Brake and Antilock system faulted and didnt work, over boost codes. etcc.. ton of mess..

They cleared them all and everything is ok now... So far.. lolz
This can happen as side-effects of a major limp. I had to learn this on my car as well. If you want to be 100% sure your car is running perfect, let all errors clear at the dealership. Of course, the better scenario would be to get no limp modes at all.

Our cars have pretty good diagnostic systems. Before I would touch the hardware in case of a problem I would make sure no errors are stored in the ECU. I let the ECU of my car check on a regular basis to know what's going on.
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      04-11-2008, 08:40 AM   #6
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Hmmmm, I've hit 20 psi a couple of times (more than an off throttle spike too) and never got a limp or codes stored. I'm wondering if you were spinning the tires. This would explain the major drop in boost for a second, then picking back up and hitting 17 psi. Usually if something goes wrong with the DSC system, it will do it while the system is actively intervening too.

Anytime you are testing out a new map you should turn the DSC off.
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      04-11-2008, 08:45 AM   #7
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Quote:
Originally Posted by turbotko View Post
Hmmmm, I've hit 20 psi a couple of times (more than an off throttle spike too) and never got a limp or codes stored. I'm wondering if you were spinning the tires. This would explain the major drop in boost for a second, then picking back up and hitting 17 psi. Usually if something goes wrong with the DSC system, it will do it while the system is actively intervening too.

Anytime you are testing out a new map you should turn the DSC off.
Funny you say that.. Im wondering if i had a misfire..

Right around 6500rpms all the power just dropped and hesitated and then caught back on.. this happend in both gears.. the Major limp mode occured on the second shift when that happened..

Also, What is the reason the car shudders, and cant maintain rpms or anythign.. I was almost basically stranded on the autobahn and had to rev and feather the clutch a bit to get to an exit..

Im assuming its the procede trying to make boost whilst the ECU is trying to induce limp boost..
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      04-11-2008, 09:10 AM   #8
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No, This studder is just Limp.. Nothing else Depending of the couse the studder is smaller or bigger.. (like different Limp modes) Overboost is one of those.
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      04-11-2008, 11:33 AM   #9
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Quote:
Originally Posted by turbotko View Post
Hmmmm, I've hit 20 psi a couple of times (more than an off throttle spike too) and never got a limp or codes stored. I'm wondering if you were spinning the tires. This would explain the major drop in boost for a second, then picking back up and hitting 17 psi. Usually if something goes wrong with the DSC system, it will do it while the system is actively intervening too.

Anytime you are testing out a new map you should turn the DSC off.
Limp modes should protect the engine from defects - so this is no more true for the PROcede V2 in case of too much boost. Sounds dangerous to me.
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