Flex Fuel
Member
Joined: Sep 2008
Posts: 101
Likes: 6
E55, GMC Suburban, F430 matchbox, Caddooo DTS
Super Member
Joined: Feb 2018
Posts: 604
Likes: 581
From: Houston Tx
2014 AMG E63S and 2020 AMG GTC
i had this come up on my car when doing a testing run up to 165mph.... at first thought it was spark blowout/misfires as car started to stumble and went into limp mode... pulled over checked codes, restarted went home and talked to renntech and they said they needed to adjust my tune as MB has a electronic limit built into the fueling and it just limits pressure to a certain amount even though the system can pump more.... they removed that limitation in my tune and no more low fuel pressure at extended high mph runs
its odd that i never heard about that before as its known to renntech, but then again I guess it only shows up on very high mph extended runs on and off the throttle so i guess not a lot of people are doing that or reporting it.... just odd they dont change their tune to remove that limitation in the first place
its odd that i never heard about that before as its known to renntech, but then again I guess it only shows up on very high mph extended runs on and off the throttle so i guess not a lot of people are doing that or reporting it.... just odd they dont change their tune to remove that limitation in the first place
What is being described above was experienced by a friend at 180 mph at the Texas Mile. He sold his car shortly after that so I wonder if the fuel pressure was the culprit. He was running a Renntech tune/downpipes on his W213 E63S.
I experienced this while flex fuel testing with a Eurocharged tune running E60 in the quarter mile. Logging indicated fuel rail pressure was the culprit. The ECU cut throttle before the engine could lean out. Jerry made some changes to the tune and the fuel cut issue was resolved. I wonder if it would rear its ugly head on longer runs, say at a 1 mile event...
