[riceygts]

I read somewhere that if code 2D18 is active your torque will be limited to 400nm (280lb/ft)?

Is this true? Any other drawbacks with running around with 2D18 present?

Thanks.

[Choolgooz]

Hmm.. where is this 'somewhere'??

Not true.

[Ilma]

It's here for starters so it's not just voices in his head.....but I have often wondered about that question myself.

http://wiki.bavariantechnic.com/inde...l_plausibility

[addicted2drums]

i think the point of the tune's is that they go around this limitation.

[enrita]

thats just an hidden code so BMW can see you have a tune.

[Ilma]

The tunes may workaround to avoid triggering codes, but shit happens and there are plenty of posts where people have triggered the tuner detection codes - including 2D18.

Secondly, that code may or may not be hidden....sometimes it triggers a limp mode under the right conditions.

Third....the question is whether it also triggers a torque limitation as per the BT link:

"This fault will be stored whether the modification is made at the MAP sensor or directly to the engine control unit and wiring. Vehicles with a certain level of programming will limit the engine torgue to 400 Nm if this fault is stored in the engine control unit to prevent engine damage"

There's more here: http://www.bmwtis.com/tsb/bulletins/...p/B122008g.htm

[RiXst3r]

Considering the stock engine control programs already limits tq to ~400nm , I don't see how this would have any effect on outside tuning... which, it doesn't seem to.

[riceygts]

From my understanding.. one of the main points of the 2D18 code itself is to limit the torque output because it has detected a piggyback.

Does anyone know if JB3 or Procede get around this with the code active? Or is our torque limited when the 2D18 appears?

[luca335i]

Does this have to do with fuel pressure or WDC?

[RiXst3r]

Originally Posted by luca335i

Does this have to do with fuel pressure or WDC?

calculated air mass based on fuel usage

[RiXst3r]

Originally Posted by riceygts

From my understanding.. one of the main points of the 2D18 code itself is to limit the torque output because it has detected a piggyback.

Does anyone know if JB3 or Procede get around this with the code active? Or is our torque limited when the 2D18 appears?

The new CANbus procede can clear this code if tripped, but even when the code is active, there is no performance loss.

[doofus2]

Originally Posted by RiXst3r

The new CANbus procede can clear this code if tripped, but even when the code is active, there is no performance loss.

Have you experienced this first-hand, Rick?

I'll tell you what I've experienced on my 33.1 car:

When 2D25 (another tuner detection code) is tripped in my car, the car goes into a mode where I see reduced boost from ~2500RPM to ~4500RPM.

If I pull over and clear the code, the car stays in that mode until I restart the engine.

If I pull over and just restart (no code clearing), the car comes out of that mode.

[enrita]

i had once the 2D18 code because i was running a race map on 94 octane only but my car did not go into limp mode and was still pulling like before.
This is on MD80 . I guess the 2D25 is only available on MD81 which has more tuner detectable features and might create a limp and limit torque.
This on JB3 , maybe procede is more prone to throw a limp :-)

[Ilma]

Originally Posted by RiXst3r

Considering the stock engine control programs already limits tq to ~400nm , I don't see how this would have any effect on outside tuning... which, it doesn't seem to.

Stock torque is around 300 ft lbs, but as you know tunes raise that up to 400 ftlbs.

So I guess the question is whether the piggyback fools the DME as to what the real "tuned" load is?

[RiXst3r]

Originally Posted by doofus2

Have you experienced this first-hand, Rick?

I'll tell you what I've experienced on my 33.1 car:

When 2D25 (2D25 is another tuner detection code) is tripped in my car, the car goes into a mode where I see reduced boost from ~2500RPM to ~4500RPM.

If I pull over and clear the code, the car stays in that mode until I restart the engine.

If I pull over and just restart (no code clearing), the car comes out of that mode.

I have never personally seen power reduction from a manipulation code, only from limp modes, which give you an indicator on the dash as well...

How could you tell that you threw the code, did you get a warning indicator of some type? Sounds more like a partial limp mode rather than an invisible code.

[RiXst3r]

Originally Posted by Ilma

Stock torque is around 300 ft lbs, but as you know tunes raise that up to 400 ftlbs.

So I guess the question is whether the piggyback fools the DME as to what the real "tuned" load is?

The PROcede does fool the DME, using the torque targeting logic and PID system.... shiv created a thread about this a long time ago, I will see if I can dig it up.

[RiXst3r]

BTW... 400nm is 295ft/lb ... first post has it wrong.

[dmurray14]

Originally Posted by enrita

i had once the 2D18 code because i was running a race map on 94 octane only but my car did not go into limp mode and was still pulling like before.
This is on MD80 . I guess the 2D25 is only available on MD81 which has more tuner detectable features and might create a limp and limit torque.
This on JB3 , maybe procede is more prone to throw a limp :-)

I'm fairly certain that the only difference b/w MSD80 and MSD81 is that 81 has the new "tune-detecting" software loaded by default. I'm pretty sure you're just as likely to throw a 2D25 on an MSD80 with 29.2+ as an MSD81.

[carve]

I wonder if data from the tmap sensor could be used to calculate power and torque real-time? You listening, Terry? It'd have to estimate frictional losses in the engine I guess though, so probably wouldn't be that accurate.

Even cooler would be if there was a strain gauge on the output shaft to measure torque. Real time power data!

[doofus2]

Originally Posted by RiXst3r

I have never personally seen power reduction from a manipulation code, only from limp modes, which give you an indicator on the dash as well...

How could you tell that you threw the code, did you get a warning indicator of some type? Sounds more like a partial limp mode rather than an invisible code.

It's obvious. Boost drops fairly suddenly from ~12psi to ~6psi at around 2.6kRPM. No limp mode, no warning.

Before the run, no detection codes seen on BT. After the run: 2D25.

While I've only tested the exact above steps on 33.1, there's good evidence that this was occurring on my car when I was merely 29.2.

YMMV.

[doofus2]

Originally Posted by enrita

i had once the 2D18 code because i was running a race map on 94 octane only but my car did not go into limp mode and was still pulling like before.
This is on MD80 . I guess the 2D25 is only available on MD81 which has more tuner detectable features and might create a limp and limit torque.

I'm sorry to say that this is incorrect. My car is MD80 and throws 2D25.

[RiXst3r]

Originally Posted by doofus2

It's obvious. Boost drops fairly suddenly from ~12psi to ~6psi at around 2.6kRPM. No limp mode, no warning.

Before the run, no detection codes seen on BT. After the run: 2D25.

While I've only tested the exact above steps on 33.1, there's good evidence that this was occurring on my car when I was merely 29.2.

YMMV.

Was this with your JB3?

Not sure which one you are running right now, I know you have both.

Reason I ask is because several jb3 people have reported "power loss without limp mode", which comes back after a restart... this was before the BT tool though. However, it sounds very similar to what you have expirience.

-Rick