C250 Re-Map Issue - Help needed

DSB SL AMG

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I change my Fuel filter every 2 years Diesel & petrol, and I do less than 10k per annum...
 
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rf065

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I wouldn't let a Diesel fuel filter go that long, it is filthy fuel!!!!!

Can't be that filthy when it's used as a cleaning fluid for tar etc.

Russ
 

Jamieheron

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I don't think that a service or the fuel filter will sort the issue, but you never know...

I'm pretty sure manufacturers like VAG recommend the fuel filter change at 60K, the major service interval. Don't see it being too bad after 35k, although it will never harm to have it changed at earlier intervals.

This service is the major one, brake fluid etc...
 

Craiglxviii

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Can't be that filthy when it's used as a cleaning fluid for tar etc.

Russ

Run a tank of pure biodiesel through a diesel car for a month or three, then look at what it's dredged up out of the tank and brought into the filter. You'd be astonished how filthy fuel can be.
 

Lit.91

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This service is the major one, brake fluid etc...

Yeah I know, not advising against the service, just don't think that it will fix the problem. I change mine at every service interval, but know many that go through the 60k mark on the same fuel (diesel) filter with no problems at all.
 

turbopete

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Run a tank of pure biodiesel through a diesel car for a month or three, then look at what it's dredged up out of the tank and brought into the filter. You'd be astonished how filthy fuel can be.

just don't do it on a CDi. you could be ASKING for trouble
 

C350Carl

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Damnit. I've just bought a new crystal ball too as I thought my other one was broken!
 

Lit.91

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Annoying....and not even a mention of the tuners name
 

DSB SL AMG

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Yep, is this another 'quiz' thread:confused: were we guess...:rolleyes:
 
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vtaylor78

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Annoying....and not even a mention of the tuners name

That would of been good to find out ?
Why start a thread asking for help then not follow it up ?
Each to their own I suppose .
 

ADZ7

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HI guys late to the party any updates with your maps worth it or not?
 

jucaralva

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The problem is weird as it's only during part throttle around 2.5-3k rpm. It accelerates for a couple of seconds and then goes into limp mode. I demonstrated it to Nass and even he said it was weird.
Same problem in my tuned c250 CDI. But finally fixed!!!
DTC located issue at rail pressure, at intake pressure or at Torque limits (exceed). Some times went into limp, depending of different maps tried.
Y wanted to understand secuencial biturbo. So searched lot of info. I got most of it in english. It was hard for me (you have yet noticed my english is too short). I suspected the trouble was related with mode in turbo1 commutes to turbo2, overloading pressure and beeing unable to regulate it when tuned (more fuel= more exhaust gases pushing the high pressure first turbo), just in that range of rpm.
After understand the proccess, i had my hypotesis: It could go better if first turbo let the second one works before overload, opening commuter gate a bit quicker.
What i did was to play with actuators lenth. After multiple tests, i found fine and powerful engine running giving +3 turnes lengh to commuting gate actuator and -1.5 turnes to waste gate actuator. I guess this values are not the same for any cartography or car. You have to test yours.
I Hope this can help somebody to get best engine tuning for your 2012-13 250 CDI.
 
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alexanderfoti

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Same problem in my tuned c250 CDI. But finally fixed!!!
DTC located issue at rail pressure, at intake pressure or at Torque limits (exceed). Some times went into limp, depending of different maps tried.
Y wanted to understand secuencial biturbo. So searched lot of info. I got most of it in english. It was hard for me (you have yet noticed my english is too short). I suspected the trouble was related with mode in turbo1 commutes to turbo2, overloading pressure and beeing unable to regulate it when tuned (more fuel= more exhaust gases pushing the high pressure first turbo), just in that range of rpm.
After understand the proccess, i had my hypotesis: It could go better if first turbo let the second one works before overload, opening commuter gate a bit quicker.
What i did was to play with actuators lenth. After multiple tests, i found fine and powerful engine running giving +3 turnes lengh to commuting gate actuator and -1.5 turnes to waste gate actuator. I guess this values are not the same for any cartography or car. You have to test yours.
I Hope this can help somebody to get best engine tuning for your 2012-13 250 CDI.

These wastgates are controlled by a wastgate duty cycle map X2. A good tuner should be able to identify where these maps are going wrong and which turbo's are being pushed too hard.

The ECU can do adaptions for the wastegates but can only compensate so much.
 

jucaralva

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These wastgates are controlled by a wastgate duty cycle map X2. A good tuner should be able to identify where these maps are going wrong and which turbo's are being pushed too hard.

The ECU can do adaptions for the wastegates but can only compensate so much.
Sure!
Tuners do their works as fine as phisically is aproved. I played the mechanics just for make the right duty cycle possible.
Please remember the object of the discussion: many differently tuned Cars identified as 2012-13 mb 250 CDI with similar issue and no solution on multiple remap trying.
We are not talking about one or two non profesional tuners.
 

alexanderfoti

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Sure!
Tuners do their works as fine as phisically is aproved. I played the mechanics just for make the right duty cycle possible.
Please remember the object of the discussion: many differently tuned Cars identified as 2012-13 mb 250 CDI with similar issue and no solution on multiple remap trying.
We are not talking about one or two non profesional tuners.

No,, but we are talking about many remapping outfits that buy maps from other sources and are not making direct changes to the tuning themselves, instead flashing a "canned" tune with preset changes for that platform.
 

jucaralva

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T
No,, but we are talking about many remapping outfits that buy maps from other sources and are not making direct changes to the tuning themselves, instead flashing a "canned" tune with preset changes for that platform.
Not my case.
I could watch the tuner how he edited the maps in Winols trying to adjust parameters. He's a reputated tuner in Spain, with hundreds of works done individually from original (no canned). You can also read here about other famous dealers (Gad....) that sure know boost duty cycle Maps. They also had similar troubles in similar vehicles.
 

alexanderfoti

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T

Not my case.
I could watch the tuner how he edited the maps in Winols trying to adjust parameters. He's a reputated tuner in Spain, with hundreds of works done individually from original (no canned). You can also read here about other famous dealers (Gad....) that sure know boost duty cycle Maps. They also had similar troubles in similar vehicles.

In my opinion, this is interaction with the torque limiters in the tcu, and would need a tuner that can datalog both the ecu and tcu and modify maps on both of them.
 

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