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  #1  
Old 08-15-2002, 07:35 PM
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moded timing resistors for 16v?

i was wondering if there were any resistor mods we can replace the R16 resistor chip with to advance the timing. i was told by taking it out and sealing it up wit electrical tape, that the timing would advance and would see some increse in power. but is there anything we can replace the R16 resistor chip with to really kick up some power? thanks

ryan
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  #2  
Old 08-16-2002, 07:31 AM
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Removing the resistor advances the timing as far as it goes. No connection is the highest resistance value, which corresponds to the greatest spark advance. Good luck, Jim
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Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)
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  #3  
Old 08-16-2002, 08:05 AM
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Do a search on the performance forum. There is a post explaining how to do this.
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Jim
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  #4  
Old 08-16-2002, 02:29 PM
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i already took mine out, but im wondering if there is a modified R16 resistor to better advance the timing.
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  #5  
Old 08-17-2002, 12:43 AM
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Unhappy

Supposedly, the euro cars have an adjustable resistor that can manually be set. In the R16 thread, someone was trying to get the MB part number for the adjustable resistor. Unfortunately, that was the last I ever read of it.
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99 C230K Sport
87 300SDL
81 300SD
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  #6  
Old 08-18-2002, 01:40 PM
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taking the resistor out, i.e. infinite resistance gives you the maximum timing advance. the dial on the euro cars just gave finer control of the resistance and therefore timing. it doesn't give an greater advance than just removing the resistor.
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86' 190e 2.3L 16v
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  #7  
Old 08-18-2002, 08:10 PM
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OK this is for the 88 300E but it may apply to your car, too. I took the resistor out of mine and test drove the car. I noticed NO difference in performance.
I went back home and hooked up my timing gun. With or without the resistor plugged in, there was NO difference in the initial (idle) timing. In both cases my timing was about 8 degrees.
I put back the resistor closed the hood and forgot the whole thing.
However, the idea had really gotten into me and latter on in the evening I decided to spend some time taking timing measurements at other rpm, too.
I had a few more resistors handy and decided to test them all.

First thing, i tried all the resistors (as well as no resistor at all) and measured the timing at idle. In all cases, the timing was 8 degrees. So, these resistors DO NOT change the initial timing.

I repeated the process, this time at 3200 rpm with the vaccum connected to the EZL. Again, the timing did NOT change, and remained constant at 41 degrees. So, the resistors DO NOT change the timing at higher rpm under high vacuum conditions, either.

Third time, I disconnected the vacuum from the EZL and repeated the process checking the timing obtained at 3200 rpm with every different resistor including no resistor at all. Here is what I got:

Stock resistor (470 Ohm): 27 degrees
250 Ohm resistor: 20 degrees
2,000 Ohm resistor: 23 degrees
1,000 Ohm resistor: 27 degrees
No resistor: 27 degrees

I was as surpised as you probably are and repeated the whole process to double check my results. Again, the results were the same.

Lesson learned: First, the stock resistor (470 Ohm) gives the highest timing value. Second, changing this resistor only affects the timing under low vacuum conditions, in other words only when you step hard on the gas pedal. All the other times the timing is not affected by this resistor.

So, I put back the stock resistor verifying for one more time what I always knew. Do not mess with what the factory engineers have done, the stock setup is as good as it could get for the purpose of the car.

Last edited by public enemy; 08-18-2002 at 09:08 PM.
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  #8  
Old 08-20-2002, 12:54 AM
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I have the German adjustable unit on the Euro 190E-2.3-16 in the family, and the main reason for the feature was that unleaded fuel in Europe was not alway available with a high octane rating. So, you see one spot on the adjustable feature labelled "N" for "Normal" or "Regular" octane, and one "S" for "Super" or "Premium" high octane fuel. And, one position is available with no resistor or an infinite value for resistance. I always run premium and have set my resistor value to the infinite setting. There is a discernable difference in performance with this car, but not at idle as a previous post notes.

I am not sure about the rest of the timing advance vs. resistor values noted, as they seem to be a bit random, which can be programmed into the EZL computer I suppose, but it would be a little more complex with no apparent payoff. Benzmac or another technical expert might pipe in here and let us know. On a 190E 2.3-16 anyway.

Good luck, Jim
__________________
Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)
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