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  #1  
Old 10-04-2021, 10:26 AM
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Join Date: Sep 2019
Location: Chicago burbs
Posts: 322
Om606 mpg

How much increased mpg
Could you get by removing cat and egr and changing
Mufflers - straight pipe?

Spoke w seller.. 99 e300td saying he did this and gets
Over 40mpg on highways

Is he right or full of BS?

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  #2  
Old 10-04-2021, 03:43 PM
t walgamuth's Avatar
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Location: Lafayette Indiana
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I think you might gain 1 mpg or so.
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..I also have a 427 Cobra replica with an aluminum chassis.
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  #3  
Old 10-18-2021, 04:55 PM
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Inflated mpg claims are really common when diesel benzes are sold.
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  #4  
Old 10-28-2021, 02:50 PM
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That seems to be made up. I had a stock one and got about 22 mpg city and 27-28 highway.
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  #5  
Old 12-17-2021, 01:53 PM
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I have the 3.07 rear gears, a NA om606 with a 6mm pump, timing advanced probably more than it should be, full 3.5 inch exhuast turbo back and a very low restriction intake setup. Car makes 2-3 psi on highway traveling 75-85mph. I get around 34mpg driving fairly aggressively. Your mileage may vary. I am looking into a 6l80e or 4l80e swap in the very near future. I hate the 722.6 transmission. converter never locks up etc.
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  #6  
Old 12-17-2021, 02:15 PM
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Quote:
Originally Posted by ClassicDieselTech View Post
I have the 3.07 rear gears, a NA om606 with a 6mm pump, timing advanced probably more than it should be, full 3.5 inch exhuast turbo back and a very low restriction intake setup. Car makes 2-3 psi on highway traveling 75-85mph. I get around 34mpg driving fairly aggressively. Your mileage may vary. I am looking into a 6l80e or 4l80e swap in the very near future. I hate the 722.6 transmission. converter never locks up etc.
your TC doesnt lock and you dont get an error for it?

the TC does a very pronounced 2 stage lockup when driving normally, infact on my E320 it locked up pretty nicely at 40 mph (not full lock though) and then the full and final lockup occured at 80 mph.

in between the lockup would vary depending on if I was passing some car or the car saw an incline etc. - I would suggest you check the SRS unit for the G sensor being active and actually zeroed with a straight level car.
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  #7  
Old 03-15-2022, 04:18 PM
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Quote:
Originally Posted by Zulfiqar View Post
your TC doesnt lock and you dont get an error for it?

the TC does a very pronounced 2 stage lockup when driving normally, infact on my E320 it locked up pretty nicely at 40 mph (not full lock though) and then the full and final lockup occured at 80 mph.

in between the lockup would vary depending on if I was passing some car or the car saw an incline etc. - I would suggest you check the SRS unit for the G sensor being active and actually zeroed with a straight level car.
the 722.600 is a garbage transmission, nothing will ever change my mind on this subject.
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  #8  
Old 03-15-2022, 05:41 PM
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At least it has a dipstick.
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  #9  
Old 03-22-2022, 02:14 PM
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Quote:
Originally Posted by engatwork View Post
At least it has a dipstick.
so does a 4l80e, and it shifts a hell of a lot better than a 722.6 and has better gear ratios to

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