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Reanimotion Reanimotion is offline
umop apisdn
Join Date: Jun 2014
Location: Brisbane, Australia
Posts: 501
Originally Posted by Alan L View Post
I'm guessing the airplate movement translated thru the fuel head piston is causing a temporary shift in CP? If you hold the throttle open (partially) presumably it will stabilize back to the original CP.
Correct - if you go back to the earlier Standard WUR logs there is a rise and swing in control pressure as the air plate pushes the piston up in the fuel distributor.

At present the electronic control pressure targeting has been allowed to try and correct the spike as part of the testing which is why there is a diminishing ripple following the initial spike.
I did this purely to see
1. if the added damper masked the air plate and CP changes - it doesn't
2. if the correction circuit reacted quickly enough - it does

CP Change from steady state at 310 kpa
- on blips is 350 up and 250 down on the first swing so approx. +- 50kpa or 7psi (same as measured on the Bosch WUR)
- normal ripple when steady is +-2kpa which is within the same error as measured with the Bosch WUR
1981 928S 4.7 ROW with KE3-Jetronic and Franken8 (AEM Inifinty) follow at []
Yes! mechanical/hydraulic constant flow injection can be managed by a modern EMS

Last edited by Reanimotion; 09-14-2014 at 02:39 AM..
Old 09-14-2014, 01:51 AM
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