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Old 10-16-2002, 05:21 PM
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reply from Hartmut Feyhl (President of RENNtech)

I hate to be the bearer of bad news, but...

(I don't think I'm going to try this "mod," if Mr. Feyhl disapproves...)

-----Original Message-----
From: Hartmut Feyhl
Sent: Wednesday, October 16, 2002 2:02 PM
To: 'Scott M. Shell'
Subject: RE: W124 M119 motor question

Not so easy, sorry. There are many different models and even much more different part#ís for the ignition system (EZL) and every unit works different and the resistors have a different meaning. In most cases, position # 7 is diagnostic mode, on other units itís reversed, on other units only 3 positions work and on some units it doesnít work at all. On those really old models where it does work it can overheat the catalytic converter and destroy it. That is the real reason why Mercedes has on cars equipped with cats a fixed resistor in every country. They were concerned for their cats, not the quality of the fuel.

M119 engines with LH or KE usually have 2400 ohm with cats and either 220 or 470 ohm without cat ( depending on control unit ). If you want to risk your cats you can try it. The difference is maybe 2 hp and not noticeable.


-----Original Message-----
From: Scott M. Shell
Sent: Wednesday, October 16, 2002 2:59 PM
To: Bob Brady (RENNtech)
Subject: W124 M119 motor question
Importance: High

Good afternoon, Bob.

I have a W124 M119 motor question, please.

What is RENNtech's opinion, please, regarding the replacement of the stock (fixed, 750 ohm) R16/1 resistor
with a (European specification) R16/1 resistor (*adjustable* from 0 ohm - 2.4 Kohm)?
What are the risks of performing this "poor man's mod," if any?

Please see comments below, copied from:

Kind regards,

Scott M. Shell (CNE, MCSE+I, CCNP, CCDP)
MIS/IT Director
TightLink Corporation
"The Power of Collaboration (tm)"
918 Parker Street, Suite # A-12
Berkeley, CA 94710-2526
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1993 500E (26OCT02) 6.5L supercharged DOHC V8 (M119) Q-ship-in-progress
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