I am not sure of any gains. I also spoke to my tech today, and he told me its better to not mess with what benz did at the factory.

I am putting it back in, I don't really think there is much of a difference if at all, but a different resistance, might yield different results.

I asked him regarding the part number of mine stating it was for 95 RON, and in california, we have 91 octane gas, at least the stations I use have 91, not 92 anymore.

I asked my tech about changing the resistor to the one recommended for 91 RON. he told me I should just leave it the waymercedes sent it from the factory.

IF anyone can run some numbers on actual gains witht heir 24 valve m104, I'd love to see the results. I do not have the capabilityof testig that stuff.

But from my mechs POV, don't mess with it, so I'm stickin to his recommendation.

I will be replacing my cap and rotor tomorrow, as well as getting my r12 refilled or refreshed or whatever. Its been really hot, and the AC is not getting cold anymore. DOH. After my car sat in the sun for 30 mins, outside temp gauge read 115 deg.. ouch. upon driving it went to 91 deg. car still runs at 80-100 deg for engine temps...

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon

Looks like you have a upgraded exhaust, lights, swaybars and Bilsteins. Does not seem like you took your mechanics advice on keeping those items stock ;-)

Have you ever researched what chip re-programmers do to increase performance on your car? Makers like Upsolute and Superchips for example? The first thing they do is eliminate the retard of the iginition, that is where the most gains are netted. All the ECU chips or re-programming services will state "must use 91+ octane gas". (they do more than just remove the iginition retard)

Mechanics are a valuable resource, but as with many, they are taught not to deviate from what the manufacture has designed. Most MB mechanics at my local dealer would not have a clue when it comes to performance mods to a MB. Do you see where were going here? Only a tuner like Brabus, AMG or Renntech would be qualified to give you advice on what is or is not safe for you to do to your engine (of course there are a few experienced MB Mechanics on this forum that know how to performance tune a motor). These are the people who spend their lives squeezing every ounce of performance out of our MB engines

As with all vehicles, manufactures build in a certain amount of safety to ensure the vehicles don't self destruct. European MB that use the exact same engine, have 0 to 2 degrees of retard on the iginition. Now remember its the same motor, just different octane of gas. There is no 87 octane gas, so MB does not have to take that into consideration when they tune the vehicle for that market. If you run your car with 0 retard, you are going to have to run with high octane high quality gas to avoid detonation. That is all.

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1993 500E
http://2phast.com/500e/500e-sig.jpg

So how does this info effect a car with a chip? I have a JET chip and didn't locate the info from their website exactly what is done in the "re-programming" with their chip.

If the chip already eliminates the timing advance, what would the symptoms be of removing the resistor?

Would like to also hear from any 119 enigine owners who've tried this!

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Brian W.

01 S55 AMG Silver
01 CLK55 AMG Silver

Just removed the resistor from the 260E and it does make a noticeable difference. I also ran it out on the highway and no signs of running out of legs in the upper mph range.

The cd manual shows right where the resistor is on the 260E, below the brake master cylinder. Mine was tied to what appeared to be an a/c line. My hands wouldn't fit into the space so I used channel locks to wiggle it to where I could reach it. Looks just like the 24.81 pic you included!

I have never run anything less than 91 octane in any of my cars and the 260 has 302,600 miles and accelerates beautifully now!

Thanks for the info. Oh, I also kept the resistor in my ash try just in case!

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Brian W.

01 S55 AMG Silver
01 CLK55 AMG Silver

So for those of us in California that only have 91 octane, should we use the

1.3Kohm resistor = 4 degree retard

If we removed the sensor all together wouldn't there be pinging because the the octane of the gas isn't high enough? Also, what damage can this cause? The only thing I can think of is the fuel mixture running rich. Thanks.

Brian

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'87 300E
Debadged
Euro Clear Corners
Updated '95 Tail Lights

If you want 0 Retard (Cali), have a few bottles of octane booster in your trunk...In STL we have 92, but I still carry it around, just in case.

Good luck

This is from the cd manual:

Slight deterioration in fuel consumption and engine performance occurs when the ignition timing is retarded.

So my understanding would be after eliminating the resistor your fuel economy should increase.

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Brian W.

01 S55 AMG Silver
01 CLK55 AMG Silver

Alon,
Just a quick clarification. In the U.S. we measure octane with the R+M/2 method. That is, Research Octane Number plus Motor Octane Number divided by 2. Or in other words, the average of the RON and MON.

Anyway, the point is that a 1.3 K would not be correct for our 91 octane fuel.

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Glen Tokuhara
Beauty & the Beast and the wagon that could!

2phast, Try reading my sig properly next time. the lower half are future upgrades.

As far as my upgrades, I have only upgraded the springs.

Shocks, 17" wheels, euro lights, exhaust, swaybars etc, are all future upgrades I will be doing.

My mech also says he hates lowered cars, but he loves my car after he lowered it with springs I provided.

I spent today at his shop, chatting, and we recharged my AC with R134A as it had been converted. Ice cold AC once again. hehe

I went with my mechs recommendatioon regarding the engine timing.

Glen, thanks for the info. I did not know that it was different.

As far as the timing, I'm going to order the 1.3 kohm resistor and possibly the others if it isn't expensive to play around with them and see if they make differences. But first, new dist cap and rotor.

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon

So since I'm in Europe I must use 98 octane gas, since 92 us octane is equal to 98 euro according to the R+M / 2 formula. Am I right ?

Here is what I found about the fuel in my country

Gasoline A 98

RON, no less than 98.0
MON, no less than 87.0

(R+M)/2 = (98.0 + 87.0) /2 = 92.5

Gasoline A 95 unleaded

RON, no less then 95.0
MON, no less then 85.0

(95.0+85.0)/2 = 90.0 --> this will cause pinging

Are my calculations correct ?

Joreto
190e 2.5-16v

I have an '87 300E and the pickup after removal of the rerisitor is fantastic! Does any one know how much horsepower is gained?If its like putting in a chip, perhaps the gain is an extra 16-18 HP?

Is there anything like this on 126's?

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90 560SEL
H&R springs
17" Alba Frontiers
Cross drilled rotors
Magnaflow Cat
European Headlights
WALD front bumper
Keyless Entry
Burlwood shiftknob
Clear corners, taillights
Limo tint
2 JL 12W6's, JBL BP1200.1, Pioneer P8200R

Hi guys,

I took the resistor out of my 86 300E and noticed mine is a little bit different than other members' resistor.

Firstly, mine does not have any parts # printed on it.

Also mine can be opened ( see attachement ) and the small resistor is exposed and therefore can be easily de-soldered and be replaced with any different value desired.

I will try running 0* retard for the next couple of days. If I notice pinging then I will try 2* retard and so on ( providing I can find some small resistors at our local electronic supply stores )

Attached Thumbnails

 

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Peter Chu aka PIKACHU
08 C300 Premium Pkg, MM Pkg, Sport Pkg, Keyless Go
86 300E soon to be E36 with Euro Headlights
400E front & rear brake upgrade
16" CLK wheels with Michelin MXV4 plus Green X

Hey Peter.

Could you tell me exactly where the resistor was located on your car. Mines a 87 so it should be similiar. Also If you could post a pic of exactly where the location is that would be helpful. thanks

I drove my car for a few days without it, and have it back in. I did not really notice a difference on my car, but the fact it needs a cap and rotor might be part of the issue. plus I drive with AC on all the tiime, dark or light, its always set to 72 and auto. With AC off I definately have a difference being felt, but I have a difference with AC off whetehr resistor is in or not.


New cap and rotor, then I will test it again.

Alon

__________________
'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon