[Longboarder]

First here's my mods: Procede Rev 3 running 11-25 maps, PWM meth, dps, dci. Car has been running flawlessly for a long time.

So just cruising at normal freeway speed i gave her about half throttle and heard a loud backfire - can't confirm where it came from (engine or exhaust) but power was reduced dramatically and no code or half-engine light appeared. Regardless, I used the Procede code clearing function just in case. Didn't work.

So I drove around for a while changing maps. Decided on Map 3 (full wastegate open) because that would give me more power than Maps 0 (stock), 1 (non-meth) or 4 (meth).

I changed the map back to 0 and floored it until 4,000 RPM, when I got the half-engine light. Cool. So I read the code (12543 - Exhaust fume turbocharger low side) and figured now that I have a code, if I clear it, it may return the car to normal. Nope. Just cleared the code and still have a car with no power.

This happens to anyone else? Thanks.

[uniter]

that's a underboost code, if you convert 12543 to hex you get 30ff. Searching that gives you a bunch of options for remediation.

Most likely: IC/TB couplings popped off.

You could also have lines that are bad or your turbos exploded.

Anyways try googling 30FF for a fix

[rader1]

Originally Posted by uniter

that's a underboost code, if you convert 12543 to hex you get 30ff. Searching that gives you a bunch of options for remediation.

Most likely: IC/TB couplings popped off.

You could also have lines that are bad or your turbos exploded.

Anyways try googling 30FF for a fix

Yep, probably just popped a FMIC connection loose

[Longboarder]

Originally Posted by uniter

that's a underboost code, if you convert 12543 to hex you get 30ff. Searching that gives you a bunch of options for remediation.

Most likely: IC/TB couplings popped off.

You could also have lines that are bad or your turbos exploded.

Anyways try googling 30FF for a fix

Cool thanks. Checked the vaccum lines and all seems well. Hoping it's the IC/TB - will check that tomorrow. But at 19psi for 2 years, the turbo exploding theory could be the correct one

[uniter]

If your turbo is shot you know it's time to ship to shiv

[Longboarder]

Originally Posted by uniter

If your turbo is shot you know it's time to ship to shiv

Totally right except for some reason I decided to go a different route and so I ordered a 2013 M3. And this was even after Shiv gave me a ride in his car!

I have a feeling I'm gonna regret this at some point. And I already shelled out the cost of a single turbo kit on an M3 Akrapovic Exhaust and MRF x-pipe and now I'm looking at $13K for an ESS VT2 600 Supercharger plus another $1K for meth integration. So basically I will pay $70K for the M3 plus $20K in engine mods and I will have a car that is slower than a single turbo N54. WTF was I thinking

[uniter]

*shrug* I have a feeling you'll like the M3 better

[Longboarder]

Originally Posted by uniter

*shrug* I have a feeling you'll like the M3 better

Hope you are right. I'm going to have to completely re-learn how to drive, though. The mid-range torque on the M3 is horrible. Even with the blower. I will need to get used to downshifting with the DCT...with the 335, no downshift is needed.

Will be a huge difference at the track. An M3 with a VT2 blower/meth should be in modded GT-R/Vette/911T/GT-3 territory.

[Wedge1967]

Yeah, but regardless, the M3 has a cool factor all to its own. You'll love the sound of the high revving v8. It may not be as fast as Shiv's single turbo, but what you lack in straight line performance, you'll make up everywhere else. Congrats...

Originally Posted by Longboarder

Totally right except for some reason I decided to go a different route and so I ordered a 2013 M3. And this was even after Shiv gave me a ride in his car!

I have a feeling I'm gonna regret this at some point. And I already shelled out the cost of a single turbo kit on an M3 Akrapovic Exhaust and MRF x-pipe and now I'm looking at $13K for an ESS VT2 600 Supercharger plus another $1K for meth integration. So basically I will pay $70K for the M3 plus $20K in engine mods and I will have a car that is slower than a single turbo N54. WTF was I thinking

[Longboarder]

Originally Posted by uniter

that's a underboost code, if you convert 12543 to hex you get 30ff. Searching that gives you a bunch of options for remediation.

Most likely: IC/TB couplings popped off.

You could also have lines that are bad or your turbos exploded.

Anyways try googling 30FF for a fix

Bingo! You were right uniter - i got a flashlight this morning and the charge pipe > TB coupling came off.

[Longboarder]

Originally Posted by Wedge1967

Yeah, but regardless, the M3 has a cool factor all to its own. You'll love the sound of the high revving v8. It may not be as fast as Shiv's single turbo, but what you lack in straight line performance, you'll make up everywhere else. Congrats...

Thanks - but when I'm at the next Shift-S3ctor airstrip event and the singles walk all over me (and maybe even the N54 meth/e85 with stock turbos!) I am not going to feel good.

Since our races here in SoCal are in the high elevation deserts, density altitude (elevation plus heat index) plays a huge roll and the turbo cars are much less affected. Even the supercharged M3's are affected just like NA cars, because the supercharger runs off a belt. The turbo cars can target peak boost no matter what the altitude.

My 335 is by no means fast, and I've raced two ESS VT1 (535 hp) supercharged M3's (one DCT and on 6MT) at altitude and the outcomes were the same - they initially pulled on me but at triple digits I began to pull on them...and both races ended essentially in the tie. And there are much faster FBO/meth 335's than me so I imagine even with the VT2 600 supercharger I won't be safe.

The M3 will shine at the track between 7,000 and 8,400 RPM. Otherwise the 335 owns! Who knows, if I don't like the M3 maybe i will swap it for a 1M - that's one little badass n54!

[GeorgiaTech335coupe]

Originally Posted by Longboarder

I have a feeling I'm gonna regret this at some point. And I already shelled out the cost of a single turbo kit on an M3 Akrapovic Exhaust and MRF x-pipe

That is going to sound awesome though, especially at 8000+ rpm.

[Wedge1967]

Oh, I couldn't agree more if you can live with the smaller 1M shell. I'm not saying I wouldn't want one, but after installing a Rev 3, FMIC, Meth, and a Single Turbo, you would be very competitive at Shift-S3ctor for less than you'll have rapped up in your M3! How every it plays out, good luck.

Originally Posted by Longboarder

Thanks - but when I'm at the next Shift-S3ctor airstrip event and the singles walk all over me (and maybe even the N54 meth/e85 with stock turbos!) I am not going to feel good.

Since our races here in SoCal are in the high elevation deserts, density altitude (elevation plus heat index) plays a huge roll and the turbo cars are much less affected. Even the supercharged M3's are affected just like NA cars, because the supercharger runs off a belt. The turbo cars can target peak boost no matter what the altitude.

My 335 is by no means fast, and I've raced two ESS VT1 (535 hp) supercharged M3's (one DCT and on 6MT) at altitude and the outcomes were the same - they initially pulled on me but at triple digits I began to pull on them...and both races ended essentially in the tie. And there are much faster FBO/meth 335's than me so I imagine even with the VT2 600 supercharger I won't be safe.

The M3 will shine at the track between 7,000 and 8,400 RPM. Otherwise the 335 owns! Who knows, if I don't like the M3 maybe i will swap it for a 1M - that's one little badass n54!

[Laguna Seca Blue]

Exact same thing just happened to me. Same loud pop followed by an immediate loss of power and then the same code. Haven't been able to find what came off yet because I'm not really sure what to be looking for.

Is it safe to drive the car about 20 miles to my mechanic with the 12543 code and yellow check engine light on? The car is a slug right now, but other than that there are no strange symptoms.

[enrita]

You popped the charge pipe or ic pipe out, just check it, easy to fix it.

[marv85]

Originally Posted by enrita

You popped the charge pipe or ic pipe out, just check it, easy to fix it.

+1, just remove your intake box and you should be able to check... definitely sounds like a hose popped of though

[Laguna Seca Blue]

Originally Posted by enrita

You popped the charge pipe or ic pipe out, just check it, easy to fix it.

Originally Posted by marv85

+1, just remove your intake box and you should be able to check... definitely sounds like a hose popped of though

Thanks a lot guys, appreciate it. My hunch was that the stock intake box was most likely in the way of whatever I was looking for. I guess this is a good opportunity to learn more about my car, so I'll do some searching and figure out what tools I need.

I presume that getting an upgraded intercooler/charge pipe will prevent this sort of thing from happening in the future, correct? Grrr, first mechanical issue I've had with the car. I guess it's the curse of the N54

[Laguna Seca Blue]

Wow, that was actually quite awesome. I've never diagnosed a problem on my car before and then found the issue.

Removed the airbox and sure enough the chargepipe was just hanging there. Half off the ribbed connector had shattered. The OEM chargepipe is very flimsy looking.

A big thank you to Enrita, Marv and then finally Shiv who explained exactly what to look for. Awesome customer service. Vishnu chargepipe here I come!

[marv85]

Easy fix Might as well get a meth kit

[Laguna Seca Blue]

Originally Posted by marv85

Easy fix Might as well get a meth kit

Yeah, I was thinking that, but not exactly sure if I can get Meth in HK. Thanks again man.

[Wedge1967]

+1

Originally Posted by marv85

Easy fix Might as well get a meth kit