06 Chrysler 300 srt, 426, 2.9 whipple, fairly small cam for build.
On startup the car chatters really bad and the engines shakes + belt slap until the idle actually settles in where commanded @760 RPMs.
I'm lost at this point on how to make the 1st minute of initial startup smoother. I have my min spark at -8 in the area of idle and all my proportional P/N stuff is stock settings. When I had min spark set at 0 or above the car would hunt at idle.
Thoughts??
Do some comparing.Originally Posted by MichaelGardinier
Last edited by coanan; 03-31-2019 at 01:26 PM.
2018 Trackhawk PCM/TCM tune by Dusterhoff.
Flex Fuel, MMX faux 95mm TB, GripTec 2.85, 10% ATI lower, FIC1200, ARH 1 7/8 w/cats, 180 T-stat
13 Chrysler 300S, RAM BGE 412 stroker, cam motion 232/246 619/619 118 +4, ATI 18% OD pulley
Whipple Gen5 3.0, 2.50 upper pulley, Smooth Boost controller, FIC 1200 inj. Nick W 108mm TB, FORE dual return fuel system, E85, FTI 2800 stall(SRT83380), SHR WAR Viking trans and valve body, Getrag 3.73, 1 7/8 kooks w/hi-flow cats, 3" Magnaflow Cat-back 943rwhp
Hey Mike - Jordan here. I would venture a guess its running really lean, tough to know unless you hardwire your wideband to a switch so you can let it warm up before starting the car (in a log itll just peg the gauge until the sensor is warmed up). Do you have a log anyways? you can look at your injector pulsewidth during the rough time and then compare to the smoother time and see the difference in fueling. Usually you need to provide extra fuel into the intake runners when the engine is cold because the fuel doesn't evaporate yet into the cylinder, so some of the injected fuel is just running down the intake runner and sitting on the back of the valve until the engine gets warmer, at which point you start getting the evaporated fuel from the previous combustion cycle plus the current injector pulsewidth, which gives the proper amount of fuel.
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