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  #1  
Old 02-21-2002, 04:26 PM
Chris17H
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READ!!! Free HP for W201 & W124 owners! (Pictures!)

Aight i got this off of www.benzsport.com so i am not to credit for this...This DOES work, i did it as soon as i got home, my car screams now, the pickup is amazing.

Free HP!

Yes, its true, for all the W201 and W124 owners (should be applicable up to at least model year 1993), here is a simple modification that will yield you better throttle response and more power. While researching some other options for upgrading the ignition, I came across some interesting data on the MB service CD. On the Euro spec MB's ignition, there is a item called a reference resistor or R16/1, it is a manually adjustable dial that allows you to retard your ignition timing. On our US spec cars we don't get this wonderful option, but we do have a fixed ohm resister to set out ignition timing. It is a 750 ohm resister which gives us a 6 degree retard in timing. This is standard on all US spec W201's and W124's, its MB answer to the poor, low octane gasoline we have in the US. Now if you are like me and only run high octane 92+ in your car, you can pretty much eliminate the 6 degree of retard altogether. My removing the R16/1 resistor, you in effect end up with no retard. This may be borderline for 92 octane gas, so another option (if you end up experiencing pinging) is to order from MB a R16/1 resistor in 2.4 kohm. This will give you 2 degrees of retard.
So far with no R16/1 resister and 92 octane gas, my 190 is running great with no pinging. The improvement is very noticeable (by my seat of the pants meter). Anyway, if you want to try this on your car I can save you a bit of a headache and tell you where the R16/1 resister is located. On my 1992 190E 2.6, (not sure where its located on the W124 though) it was located by the battery behind the black plastic panel (which is directly behind the battery and hides your ECU and OVP). You should be able to spot it rather easy since it is wrapped in black electrical tape. Once you locate it, just unwrap it and remove the R16/1 resistor, its a small black plastic plug like item with two contacts sticking out of it (MB part number 000 540 24 81). Once removed, you should tape up the wire harness and hide it back behind the black panel. Fill your car up with 92+ octane and enjoy. If you experience pinging or any other strange behavior, you should put the resistor back and see if MB can order you the 2.4 kohm R16/1. Also, on the 16 valve 190Es, the R16/1 is connected to a wire harness coming from the firewall toward the #3 and #4 intake manifold runners, it should be dangling out from the harness and its also wrapped in black electrical tape. Below is the complete chart of values (16 Valve info from the 1986 Service manual and another MB forum).

No resistor = no retard
2.4Kohm resistor = 2 degree retard
1.3Kohm resistor = 4 degree retard
750 ohm resistor = 6 degree retard (standard in US car)
470 ohm resistor = 8 degree retard
220 ohm resistor = 10 degree retard
(part number 000 540 22 81)
0 ohm resistor = 12 degree retard
(part number 000 540 21 81)


Try this at your own risk, I am not responsible for any mishaps or problems you may experience.

I have added some pics of the location on my 201. The harness wrapped in tape is circled in red. The last pic shows what the R16/1 resistor looks like and the part number. Be carefull, on some 190's (the 16 valve) there is a R17 resistor located in this location, make sure you check the number on the resistor before you pull it, the 16 valves R16 is located in another area.

I found the w124 one, look to the left of the brake resivor...It should say 24.81 on it...Might be covered in black tape








Last edited by Chris17H; 02-23-2002 at 02:08 PM.
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  #2  
Old 02-21-2002, 06:27 PM
Ashman's Avatar
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Does this work ont he M104 Engine?

Couldn't one order the euro switch for it and wire it up intot he dash or some kind of ohm adjusting switch for that?

Now that would be something cool to try hehe

Wire up a dial switch to adjust it from inside the car. got some ping, adjust it for a little more retarding of the timing. hehe

Just a thought, I'm willing to give it a shot, but I think I should replace my fairly worn cap and rotor before I do anything fo the sort. hehe

Alon

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  #3  
Old 02-21-2002, 10:30 PM
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Wink Hmmm

Has anyone else tried this, I am tempted.
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  #4  
Old 02-21-2002, 11:39 PM
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There are members in this forum and on the benzsport forum that have done this. Owners of both 124 and 201 chassis vehicles. The results are very impressive and so far no reports of pinging (everyone is using high octane fuel)

The euro spec vehicles come with the adjuster that allows you to adjust the retard, the minimal setting on the switch is 0 retard, which can be achieved by just removing our US spec 750 ohm reistor and leaving the circuit open.

Pre-odbi and odbii vehicles used devices like this to control ignition timing. On later model vehicles, ignition timing is controlled by the ECU, that is why there are after market performance chips or re-programming services available and if you notice they will all say "use 92+ octane gas" this is one of the easist and quickest ways to gain power, other items that can be adjusted via the chip/reprogram method include; bumping up the rev limiter or removing it altogether, eliminating top speed governers and decreasing the temp at which the electric fans come on (normally requires a different thermostat).

Aftermarket chips can do more or less, its kind of dependent upon who designed the chip and the vehicle.
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  #5  
Old 02-22-2002, 12:08 AM
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Question still unanswered

Will this work on an m104.

Would be good info to have.

1992 m104 24 valve engine.

Not saying I'm unhappy with my cars performance, but if this is there, its worth a shot to try.

Also it was not in my battery area. I checked hehe.

Alon
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  #6  
Old 02-22-2002, 03:03 AM
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Ashman,

Find brake fluid resevoir, look straight down then towards engine, it will be there, attached/clipped to something else I think.

I would just take that bugger off, buy a little octane booster to keep in the trunk, and when you hear pinging add octane booster. Or just put it back on when warranted. It is easy enough to get at that you could do it in a white suit and not get dirty. (Might wanna roll your sleeves up though).

hope it helps


donn
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Last edited by lowprof.; 02-22-2002 at 03:13 AM.
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  #7  
Old 02-22-2002, 04:40 AM
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hehe I looked there too and did not see anything, but I'll take another gander at it.

hehe

Alon
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  #8  
Old 02-22-2002, 06:28 AM
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OK This is some interesting info for you M104 engine owners.

The resistor is not the same as on the m103 engined cars.

IT is not located by the battery box. The R17 Trim switch the rotary switch is also not on the m104 US cars form my manual.

But the r16 resistor is there, on the left front fenderwell, behind the abs unit. It has several round connectors around it and plug in computer modules.

part number on mine is 015 545 67 28
It has it in green writing, and has a big number 2 on it.

The manual calls this R16/2 resistor.

There are several different ones form what it seems like in the manual.

2.4 Kohm for premium 95 = 0 deg CA
1.3 kohm for regular 91 = -3 deg CA
If no connector, ignition timing retarded by exactly 3 deg CA

If engine still knock, install 750 kohm resistor ignition angle = -6 deg CA approx

The following are part numbers listed in my manual..

015 545 67 28 - 2.4 K ohm
015 545 68 28 - 1.3 K ohm
015 545 69 28 - 750 ohm

015 545 70 28 - 470 ohm
015 545 71 28 - 220 ohm

The omega symbol I am assuming means ohms...

Ok so that should be some neat news. now to find out how much the resistors cost and see if its worth it to buy em.

Should I try driving without it in? I tried it,a nd car seems to have more seat of the pants feel to it.

Ran it with and without, and I think I felt a difference with it out.

I run premium unleaded here in Los Angeles, which is I believe a 91 octane.

My resistor from the chart is the 015 545 67 28 - 2.4 K ohm

So in essence, mine is intended for 95 octane, and i should use the 1.3 k ohm one for - 3 deg CA for 91 octane.

Anyone out there want to verify or correct my information and my thinking if I am wrong?

Hope this helps some of the m104 owners, I can post a link to the pdf for the info I gathered if anyone wants it....

I can also post for any w124 car, but I will have ot track down the pages for those others hehe..

Alon
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  #9  
Old 02-22-2002, 07:09 AM
LucasBraden
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Question Where on a 1985 190E 2.3 8v?

I can't seem to find this resistor on my 1985 190E 2.3. The only thing I can spot that's wrapped in electrical tape near the battery is a section of what looks to be wiring. Any help?
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  #10  
Old 02-22-2002, 10:43 AM
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Ashman,

I would like the 124 info please

donn
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  #11  
Old 02-22-2002, 12:36 PM
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Many thanks to Ashman

Thanks for sorting this out for the 104 folks on the thread. Should we link this info to the 300CE thread? I'd do it myself, but I'm not sure how.

Also, I'd also appreciate it if you could post the pdf.
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  #12  
Old 02-22-2002, 12:49 PM
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I will post it later ojn today when I get home from work...

Alon
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  #13  
Old 02-22-2002, 12:50 PM
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Well, the obvious question is whether or not the Parts Shop can obtain the euro spec R16/1 resister with the manually adjustable resistance.

That's what I want.
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  #14  
Old 02-22-2002, 02:56 PM
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On the M104 that trim switch I believe is called the R17 CIS-E Resistance Trimming plug. It is usually located behind the battery, near the OVP on models it was equipped with. the info in the pdf is great info.

Here are the links to the PDF for the R16 and R17.

http://www.a-p-group.com/ashman/pdf/r16.pdf
http://www.a-p-group.com/ashman/pdf/r17.pdf

Let us know if anyone can make out how to retrofit the CIS-E resistance Trimming Plug or something custommade to work similar. I have a friend who builds car stereo amps, and I can have him make up a custom switch if needed, so I'm not worried about being able to get it done, but it would be nice to be able to wire that up in place of my fader switch!!! hehe I would assume one has to make it hook into the R16 resistor plug the R16 resistor plugs into.

Alon
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  #15  
Old 02-22-2002, 05:35 PM
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Alon,

What kind of real performance gains are you seeing from this modification?

Will doing this damage anything on the car?

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