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  #1  
Old 09-02-2020, 12:28 PM
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Tuning a CDI as Preventive Maintenance

I'm still mulling over tuning my CDIs. While I have no performance complaints, I guess I'd be happy to get a bit more power. One of my main motivations, though, would be to head off future maintenance issues. The two that come to mind are EGR and the swirl flaps. Are there any other items that come to mind that can be dealt with preemptively via a tune?

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06 E320 CDI "Benson", Platinum Blue, 181k mi, Stage 1 tune
06 E320 CDI "Rutherford", Black, 153k mi, Stage 1 tune
91 300D "Otis", Smoke Silver, 133k mi, wastegate conversion

19 Honda CR-V EX 14k mi
Thirteen other MB's owned and sold
1961 Very Tolerant Wife
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  #2  
Old 09-03-2020, 09:28 AM
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Do you know what tuner you are going to use? It seems as though some of the well sought after tuners of years past are not offering tunes anymore. Perhaps they are but aren't listing them? Either way there are still many others available.

I too am interested in an answer as I will be getting a tune at some point for my new to me CDI. I want that EGR gone, it smokes out people any time I downshift and it makes me angry...I have a tuned 603 that doesn't smoke at all!

If you are willing, it seems an upgraded intercooler will allow you to make the most of a tune as the stock one is inadequate for much more than stock power.
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2005 E320 CDI - 246k
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Past: 1987 300D - 264k
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Old 09-03-2020, 11:35 AM
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I have heard tell of people doing this on the 642's to eliminate EGR system, regeneration system, and then replacing the exhaust filter with a pipe. That was cheaper than fixing any one of the various problems with those systems. So, you are on the right track for more trouble free long term ownership.
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2012 S350 BlueTEC 4Matic
2007 ML 320 CDI
2007 Leisure Travel Serenity
2006 Sprinter 432k
2005 E320 CDI
1998 SLK230 (teal)
1998 SLK230 (silver)
1996 E300D 99k, 30k on WVO
Previous:
1983 240D, on WVO
1982 300D, on WVO
1983 300CD, on WVO
1986 300SDL 237k, 25k on WVO (Deerslayer)
1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix
1983 380 SEC w/603 diesel, 8k on WVO
1996 E300D 351k, 177k on WVO

2007 ML320 CDI .. / 2005 E320 CDI .../ 1998 SLK 230 .../ 1991 Daihatsu Rocky
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  #4  
Old 09-04-2020, 04:11 PM
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Quote:
Originally Posted by awsrock View Post
Do you know what tuner you are going to use? It seems as though some of the well sought after tuners of years past are not offering tunes anymore. Perhaps they are but aren't listing them? Either way there are still many others available.

I too am interested in an answer as I will be getting a tune at some point for my new to me CDI. I want that EGR gone, it smokes out people any time I downshift and it makes me angry...I have a tuned 603 that doesn't smoke at all!

If you are willing, it seems an upgraded intercooler will allow you to make the most of a tune as the stock one is inadequate for much more than stock power.
As far as I can tell Jeff Robertson (Rocketchip) is still doing tunes. He is first rate and reasonably priced...tuned my 98 E300 number of years ago. BUT you either have to take the car to him OR pull the ECU and send it to him (unless he's changed his approach).

There are some other tuners that provide software to pull the data from the ECU. You send to them, they modify the file, send it back and you upload it.
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06 E320 CDI "Benson", Platinum Blue, 181k mi, Stage 1 tune
06 E320 CDI "Rutherford", Black, 153k mi, Stage 1 tune
91 300D "Otis", Smoke Silver, 133k mi, wastegate conversion

19 Honda CR-V EX 14k mi
Thirteen other MB's owned and sold
1961 Very Tolerant Wife

Last edited by shertex; 09-04-2020 at 04:22 PM.
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  #5  
Old 09-05-2020, 11:37 AM
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Well that's good to know that Rocketchip is still doing it. I think some places have stopped advertising but might still tunes if you email them. Seems most of them require you to send in the ECU but I have seen a few that can be done via OBD2 port. I probably won't start shopping for a few months, or even until next spring, so I am interested to see how your experience goes! I still have some other issues to sort out first.
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2005 E320 CDI - 246k
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  #6  
Old 09-05-2020, 01:40 PM
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Eliminate EGR

You can minimally eliminate the EGR valve using this bypass:

EGR AGR valve emulator for Mercedes Benz CDI OM611 OM612 OM646 OM647 OM648

I bought from same seller 2 years ago and have not had any EGR issues (that is a performance enhancement to me....had issues with EGR getting stuck from time to time before install) since I installed it. It will take a bit longer for engine to get to operating temp. but if you drive mostly 5 mile+ trips, it shouldn't be a problem.
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'95 E300, 216k miles, Silver Surfer
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  #7  
Old 09-05-2020, 02:34 PM
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Yeah, I've thought about that EGR emulator. Apparently 06 has few problems than 05 in that regard. I worry more about the swirl flaps...because of the labor involved. But it may be that they won't cause problems for a LONG time.
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06 E320 CDI "Benson", Platinum Blue, 181k mi, Stage 1 tune
06 E320 CDI "Rutherford", Black, 153k mi, Stage 1 tune
91 300D "Otis", Smoke Silver, 133k mi, wastegate conversion

19 Honda CR-V EX 14k mi
Thirteen other MB's owned and sold
1961 Very Tolerant Wife
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  #8  
Old 09-05-2020, 04:20 PM
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Would EGR delete help prevent/reduce swirl flap issues?
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-- Chris

'95 E300, 216k miles, Silver Surfer
'05 E320 CDI, 138k miles
'07 S550 4matic, 69k miles

Gone but not forgotten:

'76 300D, 350k miles?, SOLD in 1995
'75 240D, 300k miles, SOLD in 1991
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  #9  
Old 09-05-2020, 05:25 PM
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Quote:
Originally Posted by chronometers View Post
Would EGR delete help prevent/reduce swirl flap issues?
That's a good question. It may be that the gunking up of things due to EGR leads to the mechanical failure of the swirl flaps.
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06 E320 CDI "Benson", Platinum Blue, 181k mi, Stage 1 tune
06 E320 CDI "Rutherford", Black, 153k mi, Stage 1 tune
91 300D "Otis", Smoke Silver, 133k mi, wastegate conversion

19 Honda CR-V EX 14k mi
Thirteen other MB's owned and sold
1961 Very Tolerant Wife
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  #10  
Old 09-07-2020, 12:23 PM
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Check out Tunemyeuro.com. They do some good things for OM642's with Bluetec, so I'm sure they can help with a CDI.
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Old 09-28-2020, 03:30 AM
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*Bookmarking* future reference.....

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