Originally Posted by 240M3SRT
Im running 11.8-12.5 A/F in 1st 2nd and 3rd gear, in 4th its 12.4-12.5 all the way up to about 5500rpms then it shoots straight up to 16.8-17.8!
My tuner says hed like to see 11.8-12.0 on pump gas and that my consistent 12.4-12.5 is too lean for safety. But you guys seem to think thats fine. Has anyone installed an A/F gauge on a stock car and what was the A/F? He wants to know what Mercedes considers safe from the factory.
As far as jumping up to 16-17 its lack of fuel, either injectors or fuel pump....after everyone says they are plenty suffecient.....i think not.
Im currently running colder ngk "7" plugs stock gap of .039 but now im considering dropping that to .025 to se if it makes any difference in the A/F readings.
What you guys think? The last thing i want to do is tune it leaner if its already too lean.
I ran a rock steady 12.5 AFR from 3,500 RPM all the way up to 6,200 RPM. I have 6K+ semi-hard miles on my SRT since with no signs of peppering on the plugs.
Actually the plugs look really good!!
I'll have an opportunity to Re-Dyno my SRT once I've completed my IAT mods to see if anything has changed. I will probably use the same dyno that SRT6 Dan used and save me a trip to LA.
Give Erick @ LET a call - I know he was running way lean with 185mm Pulley on his MB and I ran way rich with the 185mm. I provided him the Chrysler part # and the Bosch part # for the injectors on my SRT.
Originally Posted by ChicagoX
Beware of "Budget" tuners.
Thos who claim to be able to tune Bosch Me2.8 in 15 mintes on the dyno have no clue about that engine management system.
I Agree - It took SI about 5 hrs. on the dyno to really dial mine in. It was a great experience to actually watch the process and view the results. About a 30HP Gain. I wonder how the "bench tuners" do it without any parameters to measure?