General consensus on current C300 W205 tunes?
All week I’ve been researching available ECU tunes for the M274. Kleemann does offers a K-Box with 40HP gain for $1495 (odd that the car has been out for two years, but Kleemann can’t find the time to update their website with the C300 spec or dyno stats). Then there’s the OE Tuning ECU software map with 65HP gain for $795 and the promise the same day reprogramming and return shipping. That’s just over $12 per 1HP as compared to over $37 per 1HP gained with Kleemann.
And then it happened; I received an email this afternoon from Rocco at OE Tuning telling me about their 20% Memorial Day weekend sale! Same 306HP tune for $636 (below $10 per 1HP) – I pulled the trigger. I’m traveling in a week so then will be the perfect time to ship the ECU. I'm happy to provide an update once the ECU is back in the car.

http://www.oetuning.com/products/mer...enz-c300-turbo
- VBox has not registered any improvements in 0-60. 6.4 sec before and after the tune
- Mid range torque has improved
- Fuel economy has improved. Have observed better hwy mpg (at least by 3-4, but will have to confirm it manually)
- Speed limiter has been removed whoo-hoo
Emailed OE Tuning regarding no change in the 0-60 time and waiting for their response.
#1) It certainly feels faster. Probably not 60HP faster as claimed, but my butt dyno is impressed with the improvements. The turbo lag seems less severe, throttle response is much better, and the car just feels much peppier; on the low-end, at least. Once I'm up over 50mph, the car feels about the same in S+ mode as it did before, but around town, it has got a lot more oomph.
#2) Torque feels more substantial and shift points seem more logical. IMO, the stock shift points were a bit rough and always felt too late.
#3) Speed limiter is removed though I haven't tested that out.

#4) Fuel economy is better (although, I've been driving with a lead foot lately since it's so much more fun to drive). Highway fuel economy before @80mph highway was 33mpg. Now it's registering as 42mpg. City fuel economy with same driving is about 3-4mpg better.
All-in-all, the tune is definitely worth doing. Don't know if the improvements are greater than those of the BMS, but I don't care. I love driving this car now and it's got that engagement level that was missing before. Must-do tune for any C300 owner, IMO.
The Best of Mercedes & AMG
That being said, would I recommend OE Tune to anyone? No...not right now. I'd advise to wait and see how the story ends.
That being said, would I recommend OE Tune to anyone? No...not right now. I'd advise to wait and see how the story ends.
Neither party ever seems to look good in back and forth forum posts and I'm sure that's not the case here...
Hope it's all resolved soon, and genuinely looking forward to hearing the performance result in the end...
All the best..
Neither party ever seems to look good in back and forth forum posts and I'm sure that's not the case here...
Hope it's all resolved soon, and genuinely looking forward to hearing the performance result in the end...
All the best..
I would suggest to OE not treat this as an IT case, pull up from the bits and bytes, and treat this as a customer satisfaction issue. There are many ways (commercially) to make this right. The longer this goes on the more permanent the damage will be.
I would suggest to OE not treat this as an IT case, pull up from the bits and bytes, and treat this as a customer satisfaction issue. There are many ways (commercially) to make this right. The longer this goes on the more permanent the damage will be.
I would suggest to OE not treat this as an IT case, pull up from the bits and bytes, and treat this as a customer satisfaction issue. There are many ways (commercially) to make this right. The longer this goes on the more permanent the damage will be.
Yeah Fair enough, many ways to achieve an outcome..
IME better resolutions resutled in direct comms with direct conversations followed up with written minutes to prevent confusion. This is ALWAYS in the case of a reasonable, respectful and caring vendour and customer working amicably to resolve. Of course not every scenario has the latter ..
Anyway looking forward to the technical solution and increased understanding it provides to all of us.
Cheers.
http://www.dinancars.com/product/d44...?series=&mid=/
May try it out since the wifes C300 could use a little fun mode for when I drive it. Always have had good experiences with the Dinan parts I've had on my BMW's, even if my wallet isn't happy about it.
http://www.dinancars.com/product/d44...?series=&mid=/
May try it out since the wifes C300 could use a little fun mode for when I drive it. Always have had good experiences with the Dinan parts I've had on my BMW's, even if my wallet isn't happy about it.
http://www.dinancars.com/product/d44...?series=&mid=/
May try it out since the wifes C300 could use a little fun mode for when I drive it. Always have had good experiences with the Dinan parts I've had on my BMW's, even if my wallet isn't happy about it.







