W204 om651 upgrades

[kingsley1201]

I've been reading and it says the om651 engine is a good engine to modify whether it's a tune or upgraded parts I like the pull in lower gears but when it gets to 3rd or around 50mph it starts to slow down I'm happy with around 200hp if I can get it but I don't really want to put a tune on the engine as it's nearly 200,000 miles. Probably gonna put a cat back exhaust or a downpipe maybe do something with air filter, smaller crankshaft pulley and turbo upgrade potentially guessing I'd still have to get it all mapped out ? Not really many shops out there or people to talk to about best way to do it, it's 136hp engine I could just get it mapped to 190bhp but unsure on mapping it thanks

 

[M80]

Can't see what you'll gain from a smaller crank pulley.
Mappers will have reluctance on a high mileage engine, likely you'll have to sign away any (worthless) guarantee.

Personally I wouldn't do more than remap.
If you try to map out components that is likely to create other issues later.

 

[sonic]

I wouldn't do this on a 200K miles engine, too much of a risk.
Save your money & buy something with a bigger engine. There are loads of cheap E350CDI's about.

 

[kingsley1201]

Think I'm gonna buy something for a side car maybe a 260 or 190 and do an engine swap I'm not getting rid of my c200 done bare things to it many memories been everywhere with it might look at an engine swap one day

 

[kingsley1201]

Can't see what you'll gain from a smaller crank pulley.
Mappers will have reluctance on a high mileage engine, likely you'll have to sign away any (worthless) guarantee.

Personally I wouldn't do more than remap.
If you try to map out components that is likely to create other issues later.

Smaller crank adds HP just runs alternator and power steering pump slower.

 

[w204benz]

Keep in mind it's not really a 136hp engine - that's a factory de-tune.

A good tuner (who came across as very cautious) told me 200hp is a "safe" remap on this engine. Maybe that is what it was originally designed for? I read somewhere that they can easily handle much more.
But I can understand not wanting to risk it with that mileage.

What I would recommend is an EGR delete. Probably the best 'easy' mod you can do to this engine. Just make sure you use a reputable tuner. If you've had the diesel software update in the past, it will feel like a remap.

 

[kingsley1201]

Keep in mind it's not really a 136hp engine - that's a factory de-tune.

A good tuner (who came across as very cautious) told me 200hp is a "safe" remap on this engine. Maybe that is what it was originally designed for? I read somewhere that they can easily handle much more.
But I can understand not wanting to risk it with that mileage.

What I would recommend is an EGR delete. Probably the best 'easy' mod you can do to this engine. Just make sure you use a reputable tuner. If you've had the diesel software update in the past, it will feel like a remap.

Been thinking about egr delete just pricey and prefer to do work myself but maybe it's one I should get done, best to talk to a good tuner like you say probably isn't anything to worry about just might do a few preventative maintenance jobs and get it mapped after I fit new exhaust. Plenty of people tell me the turbos are good on these engines and high milage isn't anything to worry about as allot of people get high mileage cars remapped

 

[w204benz]

I used a local tuner who has a Master/Slave set up with a UK tuner (Ubertuning, I think) - so he probably has additional costs - and the EGR delete was still relatively inexpensive. But I'm not in the UK - perhaps UK tuners charge a lot more for their time.
Just find a good one and avoid those that only know how to press auto-tune on a laptop - that's just asking for trouble!

I'm assuming you've got the VGT turbo too. I believe that if you avoid revving the engine hard before the oil warms up and if you make sure you give it a minute or two to cool down after pushing it hard before shutting down the engine, it should be pretty reliable.
The only issue is size - it you wanted a more extreme tune. I don't think you can get much past 220hp with the VGT before airflow becomes a problem.

I've also read that the OM651 is good for high miles - apparently in countries where they're used as taxis they're still fine at 400k+. But I don't know much about tuning (or high mileage engines), so I wouldn't assume you would be fine. I'd leave that to those that know more about theses things.

 

[kingsley1201]

I used a local tuner who has a Master/Slave set up with a UK tuner (Ubertuning, I think) - so he probably has additional costs - and the EGR delete was still relatively inexpensive. But I'm not in the UK - perhaps UK tuners charge a lot more for their time.
Just find a good one and avoid those that only know how to press auto-tune on a laptop - that's just asking for trouble!

I'm assuming you've got the VGT turbo too. I believe that if you avoid revving the engine hard before the oil warms up and if you make sure you give it a minute or two to cool down after pushing it hard before shutting down the engine, it should be pretty reliable.
The only issue is size - it you wanted a more extreme tune. I don't think you can get much past 220hp with the VGT before airflow becomes a problem.

I've also read that the OM651 is good for high miles - apparently in countries where they're used as taxis they're still fine at 400k+. But I don't know much about tuning (or high mileage engines), so I wouldn't assume you would be fine. I'd leave that to those that know more about theses things.

That's something I'm going to do is find a car tuner that is well known and knows about these engines I only say expensive cause I wanna do things myself so probably would delete it but then get a tuner to come out and sort everything maybe. When I start it I let it idle for 5mins so everything is warm as I've been told to let the turbo circulate and warm up, I just want around 200 it's my daily so nothing crazy still want the great mpg if I wanted a fast car I'd just save up and buy a c43 or a45 cheaper options to maybe a c63 rather not have it stolen tbf. Gonna put a cat back exhaust on it and a sports cat probably an intercooler and see what I get, also the engine has been taken care of all its life been in Merc garage every year for full service now I do the services myself I'm just worrying I've seen vws, bms, saabs mapped out and they never stop besides if engine gives up I'll just swap it or rebuild it as I know I won't ever sell the car. Thanks for the response

 

[w204benz]

Oh, I completely understand wanting to DIY - I looked into it myself at first, but just getting the proper tools would have cost a lot more than a good tuner.
And I was also told that the delete is not a simply an on/off option but requires modifying the right bits of code - and you can make things worse if you don't do it right. So you need a good idea of how there engines operate.

I don't want to discourage you from trying to figure it out and having a go (though is it a good idea on your daily?) but if your plan is to only do it once, it may not be the best use of your time and money compared to paying a tuner.

 

[kingsley1201]

Oh, I completely understand wanting to DIY - I looked into it myself at first, but just getting the proper tools would have cost a lot more than a good tuner.
And I was also told that the delete is not a simply an on/off option but requires modifying the right bits of code - and you can make things worse if you don't do it right. So you need a good idea of how there engines operate.

I don't want to discourage you from trying to figure it out and having a go (though is it a good idea on your daily?) but if your plan is to only do it once, it may not be the best use of your time and money compared to paying a tuner.

I did an EGR delete on my old car was only an astra but I have idea of what to do but I know that they just remove the complete EGR and blank everything then map out or leave it just blanked so can just do either and call a mobile mapping company out to sort all the computer side out, there's obvs risks when you do it yourself and tbf it's not too bad of a price to get it done by someone I got quoted 300 for delete and remap from a lad I know think letting a pro do it is the better idea

 

[w204benz]

I did an EGR delete on my old car was only an astra but I have idea of what to do but I know that they just remove the complete EGR and blank everything then map out or leave it just blanked so can just do either and call a mobile mapping company out to sort all the computer side out, there's obvs risks when you do it yourself and tbf it's not too bad of a price to get it done by someone I got quoted 300 for delete and remap from a lad I know think letting a pro do it is the better idea

Now I understand - I thought you wanted to have a go at the remapping! I suppose you can disregard my previous post.
Because on the OM651 it's a bit different. You don't need to pull out the EGR or blank anything off (I think the design would make that very difficult). You just need to map it out in software.
The ECU will then keep the valve closed. Or not tell it to open - I'm not sure which but the effect is the same (assuming the valve works fine at the moment). And the sensors can figure out if anything is flowing through the EGR, so if you just blank it without modifying the software you'll get errors, maybe even limp mode. I agree, it's not too bad a price including the remap - about what I was quoted.

 

[kingsley1201]

Now I understand - I thought you wanted to have a go at the remapping! I suppose you can disregard my previous post.
Because on the OM651 it's a bit different. You don't need to pull out the EGR or blank anything off (I think the design would make that very difficult). You just need to map it out in software.
The ECU will then keep the valve closed. Or not tell it to open - I'm not sure which but the effect is the same (assuming the valve works fine at the moment). And the sensors can figure out if anything is flowing through the EGR, so if you just blank it without modifying the software you'll get errors, maybe even limp mode. I agree, it's not too bad a price including the remap - about what I was quoted.

Ohhh didn't know it could just be done through mapping so without removing it would be even cheaper just to get it mapped and yes heard about the limp mode one probably would either do that or check engine light. Thanks for the knowledge