C250d Remap and Options

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aZiRo

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Hi, I've had my W205 C250d for a few months now and I'm booked for a remap soon, now I was playing with the idea of getting the car to 300bhp tho I soon realised that would be quiet a jump and it would most likely involve a new uprated turbo and probably not worth it(for me).

All of that being said I'm still looking to get the best of this car without running a bill into the thousands but there are a lot of things I don't currently know about this car...had an A5 TDI before and that was completely something else never had any Merc before.

So here are a few questions that I would be interested in and can't find a definitive or at least convincing answer to(as the info on this car is very limited as are parts at least compared to my A5)...If anyone would be so kind to help me I'd greatly appreciate it.

1.How much torque can the 7G Auto box take?

2.I'm considering a DPF delete(I've been quoted 250£) would it make a difference(and how big) to my results after the map? Also since I'm gonna remove my DPF somewhere different from where I will get the map will I be able to still drive it for a bit or it would need mapping then and there.

3.Is the EGR delete as simple as just software based or you'd actually need blanking plates like on some cars?

4.What would I need to get closer(not necessarily reach it) to that 300bhp and possible 600nm torque? I mean I'd imagine...I would need to do the dpf/egr removal... a new intercooler but I still need to find one for my car.

4.When I was driving my car had decided it was time for an engine management light...I scanned the car and realized it was a nox sensor... took it back to big motoring world where I bought it from and they confirmed and they were supposed to change it for me..but 1 day before appointment they went into lockdown and I don't know if I'll be able to go to them before I go get the remap...Is that going to be an issue? I think they should be able to even disable it if I took out the DPF as I don't see the point in it anymore unless I'm missing something(might be wrong).

Well if you managed to get so far I appreciate it and welcome any help or advice. I know there was an old 2014 post where GAD tuning were claiming they were working on a c250 cdi supposedly trying to break 300bhp idk what happened to that project...I'd be interested. Thank you
 
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aZiRo

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Well since I just got this one thats not really in my options..

So how much would you recon I could get without going into turbo change.. plus the torque...I saw an earlier post and on a E250 they got around 80+ nm am I wrong in thinking this is the same engine and should see similar results?

Think i’d be over the moon with 270 and 580
 

Gazwould

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580 Nm is the easy part but 270 BHP difficult .

Mercs have a 'dyno mode' for the rollers but back to normal out on the road how much torque is the gearbox going to let you actually have ?
 
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aZiRo

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So how much of an improvement would you say I’d see with the dpf removed and can I still drive it for a bit without remapping?
 

Gazwould

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As soon as you touch the accelerator it will go into limp mode as the pressure sensors will report the pressure is too low .

Probably torque and mpg improvement as freeing up back pressure .
 
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aZiRo

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Alright, an regarding the nox sensor engine management light will that be an issue if its not fixed before the remap?
 

Gazwould

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Need that fixed before remapping .
 

V6Matty

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Fix it before as there is often a need to update the ECU after fitting a new one.
 
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aZiRo

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Fix it before as there is often a need to update the ECU after fitting a new one.
I'll try to get it done before hopefully.

So I don't have many chances of going past the basic remap result that 99.9% of people with this car get.

I used to have 177bhp on the A5 and got that to about 215 but somehow always wanted 250 out of it...I spoke to darkside development and they quoted 3-4k but they could take it to 325bhp they said...at the time it made no sense as the price was steep and I had to change the car due to ULEZ anyway...

Now on this one I can get 250bhp.. but somehow I just can't stop going to that "more more more mentality" and want 300bhp.

On the A5 I said I won't be going diesel again(at least there you can get a pipe, a filter an induction kit and puf stage 2 like magic)..and here I am still on diesel...This time I'm sure not gonna go diesel again... most likely c43 next...it'll be a whille
 

LostKiwi

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Don't remove the DPF. It's an instant MOT fail.
 

Gazwould

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I'd be surprised if he doesn't know that .
 
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aZiRo

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Don't remove the DPF. It's an instant MOT fail.
I know the law says its illegal and an instant MOT fail...but 100£ says I won't.
 

Gazwould

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I'm sure there is alot worse that the gubberment isn't telling us about .

It's all about money , not health .
 

LostKiwi

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I'm sure there is alot worse that the gubberment isn't telling us about .

It's all about money , not health .
No it's not. Not if you're asthmatic at least.
NOx and PM really screw with breathing for anyone who suffers with asthma.
I'm not asthmatic but I do struggle with diesel fumes - usually end up with a coughing fit if fumes are bad enough.
 
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aZiRo

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If you live in London and go into ULEZ it's pretty irresponsible.
Don't want to turn this into a emissions post but I don't know whats more irresponsible..having to pay a ULEZ charge on a A5 2012 or that buses smoke the crap out of everything on the road but nobody got **** to say because government makes money...or that you can install a emission reduction device on a any big lump but not on said A5...or that classics are excluded from those rules meanwhile i wouldn't smoke 20% as much as those cars..etc.. lets not kid ourselves its all a giant money making machine and theres nothing to do with global warming and what not...

All the rules and fines are always imposed on tax payers and the small guys but anything government based is fine to run as is...

I think I will enjoy driving a DPF free car...that doesn't kill my turbo..and for which there was probably more pollution going into the making of said DPF then I would pollute using the car without it.(don't leave or drive in ULEZ as of yet but will be from next year)
 

Gazwould

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Weird how the mot testers I know
( some veteran ) are in fine fettle .
 

AMGeed

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Welcome to the forum OP:)
Please don't take my reply as an insult or derogatory in any way but........
Why did you buy a 250d if you want more bhp and torque?
Did you not research into the performance figures before buying this model?

Only too often members join up and are asking how to get more power/torque out of their chosen engine when a different choice of car would give them all they wanted in the first place.
And I write this knowingly open to ridicule, having bought a V8 and remapping it for even more bhp and torque.
 
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