Greetings All!!! Im happy to join this Forum and i am New as you can see! Excuse me in advance if there is already a Post on this subject

So here is the Deal

W204 C300 Cdi 4matic 231hp facelift
My questions are regarding How to Make my car 350hp if possible 380-400hp

And Before anyone says "just buy a C63" No thanks
i am Not a Big Fan of w204 C63's plus i Love my 4matic and my car has saved me in critical situations a Lot of times and i am sentimental aboit it .

Money is NOT a problem,Not at All
even if the Costs are overpricing the price of a Real AMG
Yes You Heard me Well

I will be buying a S63 w221 so this car will still be driven by me and my Wife i just want to make it the beast it always deserved to be for Drag,Street racing and drifting!! (My wife and I we love racing)

Engine Parts,BMC Air Filters,Exhaust systems,Chip Tunnings,Turbo,even if i have to change engine parts cylinders and rework the whole engine i am all Ears!!!

The engine is OM642 and i have heard that the engine is very open for modifications!


Any professional advice and ideas are welcome!!!
For Now the things i have done to the car are only exterior tunnings and the suspension is lowered and it is even lower than a original w204 c63!

I just love Our Car and as i said Money is Not a problem
+ it is a part of my Merc Collection and it will NEVER be sold!

Thank you all in advance for the Time and Ideas
Hope to hear from y'all soon =)

I am posting some pics now of the vehicle As i said no Engine Mods .. For Now ;D Only exterior mods + i am waiting now for a Maxton Design front spoiler Also forgot to mention the vehicle comes from the Factory with 950 AMG Sport package and 772 AMG styling package and sports suspension + Original AMG Badge and i just love it!!! But let us do now some Upgrading to the Engine as well =)







Forgot to mention Original 17's AMG wheels just painted in Our favourite color!!!

 

Hello , i have the same car , how did you lower your car , springs , shocks ? Can you post side picture of car?

If you have over 100 000 miles i would advise you to check front drive shaft before tuning your car because they tend to fail due the wear , just as precaution. Also check rear subframe for rust !

Mine has 190 000 km , never had any problems with engine , it runs perfectly but i changed rear subframe on warranty , front intermediate shaft and recently changed vacuum pump cause it leaked oil.

Recently i retrofitted black w207 coupe seats into mine , they are more comfortable and you can get better sitting position with them cause they go lower than standard seats and they look amazing.

 

I bought the car with this suspension
it was 219 000 km when i bought it 10 months ago
Now it is 232 000 km
It was in VERY good shape when i got it
Soon i will go to the MB dealer to change regular things like oil and to see if any parts need to be fixed or changed and get new ones.

I will investigate the suspension with the worker there and i will tell you exactly what it is , also i will check the driving shaft and the subframe as you mentioned thank you for the advice =) !!!

As you can see this is my first car and im not the big "know it all" when it comes to engines,parts and maintaining
I just make sure to follow oil changes ,part changes and all the things needed for a car to be in a perfect shape and i have Not had any major problems.

As far as it goes for the seats in my vin decoder it says i have the "sport seats,front" option and i will keep it in that "classic" interior look i love t!!!
I will change the silver parts in the car with black ones
actually i will just add black foil to them so that they can be protected i have 3 pets and also it will give the interior a more sporty look
I have my gear changer in Blue as you can see but i will fix it again as it has a scratch xD

So tomorrow i will post a picture of the car so you can see the suspension from a close angle and when i gi to the dealer i will tell you exactly what is happening down there

I don't understand a lot of things about tunning
but i have heard that a Big turbo will do the job as well when it comes to engine mods + chip tunning in an authorised tuner + the golden BMC air filters that boost the air flow
and i saw a "down pipe" exhaust system in a website here that says it boosts the horse power with around 40 hp
Now i do not if that is true but i think it would give my car a boost xD .You tell me if it is right D
im just planning A LOT of engine mods on my car and i will make sure to show pictures when time comes and give you advice as well if i can =)
the Om642 is very good for tunning i have seen so if you have any further advice on what turbo i should choose im listening
and again im looking only at TOP quality products

p.s.
Here is a pic compared to another w204( i was not sure if it was like Mine a c300 or a c63 because it had the c63 body kit but it was way to up for a c63)
Mine is on the right and it sits very low

I also travel a lot with my wife and with my 3 dogs and this car now i understand why it was called the "mini s class" back in the day

Maan .. really comfy and it even has a bit of a racing nature with those 231 hp only!!!

And it has a lot of space enough for 2 people 3 dogs and a lot of baggage
It even has space for 3 people and 3 dogs i have tried that D

Some time this year i will be going for the w221 s63 because i just love Mercedes and i want to see what it is to drive a Big Luxurious Sporty apartament DDD

I will be driving both cars everyday with my wife and i want to see the differences as well between a tuned C300 w204 4matic and a S63 AMG
I presume the w221 will feel a bit sloppy because it is a massive car but still i am excited and Ofcourse i will tune the interior and the exterior of the S-class as well ;D
Still hesitating between the M156 or the M157
Love both of em ... but damn on a w221?!?!? Which would be better ?? The torque monster ? Or the Head-Bolt problem Revvin' monster?? XDDD
m156 is a classic but m157 is very nice too!
I really hope at the end i can show you what i have gotten and just post here the "making it look like a beast " process

Im Just a Merc-head that has just started to get his Mercedes collection and with time passing i hope i learn a lot about theese cars ,Cheers and hope to hear from you soon!!!

 

The problem is that hardly anyone upgrades these cars, so the market is very small and limited as there is small demand for tuning these cars , all i could find is ecu remap and some sort of high flow exhaust , egr and dpf delete options and thats it. Everything else is non specific for that engine and you would have to experiment what parts work and what not.

Here is C 350 CDI tuned by GAD Tuning , 324 hp and 785nm with only remap , high flow dpf and some small intake modifications

This is the Most Powerful C350 CDI in the World - autoevolution
GAD Tuning 350 CDI Development 800 NM of torque | Mercedes-Benz Owners' Forums (mercedesclub.org.uk)

Also consider your car has over 200 000 km , his best days for tuning are gone already , pushing it now can cost you turbo problems , fuel pump , injection problems , transmition ........etc

Personally i would leave it alone as it is and buy something with m157 engine in it as weekend car and tune it if money is not problem. It s far more tunable than m156.

Something like these , m156 has bene replaced with m157 engine

 

I have read all theese articles + that red w204 i have seen the video and yeah..it seems brutal

No GAD tunners in my country tho!!!

But here in my country we have some very good both underground and authorised tuners that is the reason i am going with this.I know what the risks are and honestly they do Not bother me at all.In the market of my country spare parts as well as engines are everywhere to be found and there are just lots of them but i am Not getting into that because im pretty sure that my car can handle this.
Yeah past 200 000 km and i know i just have to experiment but im On for the dive in the Deep!!!

I will make sure to post all changes and tunnings once i am done with them and share experience

For instance i know this is a different engine but i have seen CLS 500 w218 (CLS 550 USA ) here in ny country go from 400 hp up to 560 and 600 hp and that is with no major issues,Regular oil changes and parts when they need to be and all is set and good to go!!!
Cars that have 280 000 km on the clock.

That is why im going to try some new things and try to push this OM642 beast!

For instance a very "basic"chip tunning in my country will do the horse power from 231hp to 280-285hp torque from 560/580 to 620/630
and this is just the basic ones ,i am aiming at ones which are from authorised tuners and cost more

Then i am going to talk and inform myself about the Turbo
A Bigger turbo might be a good idea but it may be Not so i will make sure to investigate that as well

DPF and all those other systems removed as well

I will make sure to experience all the modding of the engine myself ,seeing the process and what the tuners do and how because sometimes from reading in forums i don't get a lot of info.
For example here you helped me to see driving shaft and subframe to be changed and checked but a lot of other forums either have No info or do Not respond..

I will make sure to post it here in a couple months when it is ready and probably give some advice as well!!!

So let's say we boost it with only the chip tune without the bigger turbo to 290-300 Hp
Then next is the exhaust system a bit of modding as well
320 hp with luck and more help from the tuners in my country i think we csn get to 330 340hp with no medium or major problems so i will make sure to do that

I am really ambitious about this one and i am sure it will turn out very well.Yes some cars break down ,but others don't ,every vehicle should be viewed as an individual one and that is what i will be doing to mine.

Making it from "Sport Mode" to "BEAST MODE" DD

Man..tuners here can make magic..only that it is Real Magic

As for the m157 ..Well i think i will get the m156 w221
i mean i love stock AMG's i presume they are still fun to drive
I don't think i will be tunning the car if i get it with the m157

i've seen lots of CLS 55 AMG 2008 here with 750 Hp fact but still i dont think i will be tunning my future AMG's ..but who knows!!!

For the beggining i want to see what it is to have the classic m156

Besides it eating gas like crazy and a bit of malfunctions here and there i still see it as a true classic.
Don't get me wrong i used to love W204 C63 but man that thing drifts like crazy
Not a Big fan of drifting here
My wife prefers it
but a w221 s63? Im in!!!
Thanks for replying once again!
Here are the pics i promised yesterday

Ans yeah i got a lot of cosmetic work to do before the engine mods
Like New expensive brakes(want to make sure something very Top quality)
Some Protective Black obsidian foil over the whole car the facelift headlights the front spoiler and etc..

It will take me some time
but You know!!!
Good things in order to happen in life they take time and patience!!!
LET'S MAKE THIS CAR A BEAST !!!☆☆☆

 

I have spoken with a tuner here that perfectly knows the OM642 and only with a stage 1 chip tunning we will be able to reach 300 hp!!!
This is WITHOUT air filters ,dpf off and change of the turbo

So after the chip tunning and BMC air filters we will be able to reach 310-320 horse power

I will make sure to Document the process with pictures and videos so i can show you here

In the following months i will show the progress here as we climb from 231hp to 300
from 300hp to 320hp from 320 to 350 and Up

I am very excited for this process!!!

 

Speaking with tuner did he mentioned any engine weak points you should consider to fail over time , what is power limit for that engine before internals failure ( pistons , crankshaft rods etc.... ) and what is his overall experience with tuning om642?

Also i wonder if 350cdi ( 265 hp ) has different turbo or injectors than 300 cdi (231 hp ) ?

 

OM642 is quite rugged. It is used in many medium duty commercial applications. But the heavier the service, the lower the power rating usually is, which leads me to believe there is a stress vs reliability engineering concern.

The engine is about 10% over square (83mm bore x 92mm stroke). Without any experience, I would be concerned that the connecting rods or lower end may suffer early failures at higher power output.

As far as I can tell, all variants have the same Garrett variable geometry turbocharger, but I haven’t checked part numbers.

 

Thanks for replying to my Post!

Weak points- a part that when starts cracking people think it is the timing chain because of the noise and they replace the chain when what they had to do originally is replace that part( forgot the name of the part will ask him again) not the timing chain xD
I remember it was connected with the timing chain in a way but can't remember the part name xD

Some oil filters and injectors
i remember he mentioned something about a minor leak from somewhere that is not a big pain but has to be fixed if it appears
I will make sure to ask him again and answer your questions buddy!

Well when i spoke with him we discussed that making it Stage 1 there is basically No harm for the engine in the near or far future

Stage 1-chip tuning, BMC air filters,DPF off -310hp -320hp

Drive it a few months and if i want even more Power we can make it Stage 2 (still no harm or possibility of harm for the engine) and it will go about 350hp and even more like 360 370hp i presume

But when i asked him about Stage 3
He told me that it is possible but before that i will have to replace a LOT of parts before we do it

He told me that if i do Not replace them with brand new and take care of my car(which i do) when we make the mods,
The Mods will make other parts collapse and those parts on their hand will make other parts collapse etc..

I am not actually planing on making it Stage 3 ( for now ;D) since the maintining of the car will have to be strictly followed
I have no problem with following that strictly and changing parts often it is just that for now i am working a Full Time Job that is messing up my schedule with my wife..
Later this year i will start doing what i was doing before this job , leave this srupid Job so i can be with my family back home and continue with my own business

I will maintain the w204 in a garage where all the processes will be strictly followed (and ofcourse when it's winter the car won't be freezing) and i will have LOTS of more time for my car (future cars)

As for the tuning
He said he can do it is not a problem But i will have to maintain it strictly and more often

For now i will post pics when we do the stage 1 and i will share my experience
Specifically this Tuner knows OM642 very well
I don't know how but he was the first tuner i spoke with and he turned to be the one who knows OM642 inside and out and knows everything about it.What a great coincidence it turned out!!!
I will ask him when i can the questions you asked here about the C350 turbo
I advised myself with him if i need to change the original turbo from the factory to gain some Hp or boost the engine but he told me that there is basically no Need to do that (won't gain hp won't make a Lot of difference)
at the Most i will only waste money

Well about the Power
He told me engine is Very Good with tuning and it can handle a lot of power usually but Still we have to be cautious when it comes to maintance
Pistons and crankshafts (i will ask him again) but i think he said that they may start failing at about above 410p 430hp which is Stage 3,Stage 4 if the vehicle is Not serviced often
But yet again that is different for every vehicle as every vehicle is unique

Now they WON'T start falling if the car is Stage 3 and is taken good care of but you will need to service it more often and take good care of it

He told me also that has tuned w221's s320 s350 and S-classes with this engine (cars that are made for business not for rolling and drifting) and they get quite quick and have a lot of more dynamic and start accelerating very fast for an S-Class that is Not AMG
When it comes to my w204 i can only imagine..we can literally make it a beast.

As for the wires and all things under the car and engine
if they are REALLY taken good care of there will be No problems(yet again)
For my Vehicle specifically i service it always on time and the engine is in basically Perfect shape
It's almost like a brand new and the reason im saying almost is because of the 232 000km on the clock but even then when you take good care of it it's like stainless steel -won't brake only will shine
That is what i have noticed for 11 months of ownership
As for the tuning
Everything is possible!!!Just find a Tuner that knows his stuff and maintain your vehicles friends!!!

And if you will tune your cars just make sure EVERYTHING is serviced or replaced with brand New
That's the key to succesful reliability in future when it comes to modifications.

 

Maybe he sed timing chain tensioner or timing chain guide set ?

Oil leaks could be from oil cooler seals , red seal connecting turbo and airbox intake causing it to drop oil on swirl flap motor causing it to fail or it could be vacuum pump seal which also tends to drop oil over drive belt.

I agree , changing oil every 10000 km and not going cheep on parts is what makes every car reliable on long run!