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umop apisdn
Join Date: Jun 2014
Location: Brisbane, Australia
Posts: 642
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UPDATE,
As part of the EZL/EZ69 development, we have unfortunately discovered a little issue the Mercedes EZL as a cheap option.
The fuel coding signal (mercedes) is on the same pin as the Porsche charge air temp sensor is on the 965.
And the resistances are inverted between the Mercedes coding and the Porsche sensor!
Therefore, as the intercooler heats up, ignition timing could advance by up to 6 degrees instead of retard by up to 2.8 degrees.
Not good if you are wanting to protect the motor.
The 538 and others are still likely a good candidates for a "Get me Home" emergency spare to keep in the toolkit, but really not a good choice for extended use.
__________________
Steve
1981 928S 4.7 ROW with KE3-Jetronic
"Be the man your dog thinks you are."
www.FrankenCIS.com
Last edited by Reanimotion; 08-29-2025 at 04:55 AM..
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