Originally Posted by SLK32Germany
Interesting, I am running 11,03 A/F on the Dyno at 6.500 RPM in 4th Gear with the big SL55-Pump and a 185mm comparable Pulley-Ratio. Like I said a a year or two ago, AMG changes the fuel Pump even on the Stock 32 if you have the ability to stay longer WOT (when you delimit the 155MPH Speed-Limiter). They would not do that if it isn't necessary. I cannot tell exactly if the fuel-problem exists already in the lower gears, but in 5th gear i can tell for sure. I like to be safe, this is why I recommended Dave the SL55-Pump...
SLK32 i have question. How lean were you running before and what was the temp? And have you monitored the afr on the street?
Ive watched completely fine AFRs on the dyno run up to 20+ on the actual street.
I really want to believe the sl55 pump will fix my issues but like i said the walbro 255 made no difference at all.