Ok, we've been playing with my car on the Wideband since I got it back on the road.

We were getting the WOT to about 11.0:1 fuel to play around with timing, and see what the car likes, on the safe edge of performance.

So far, with 2 range colder NGK's, a Blaster coil, and LOTS of playtime on the laptop, we've got the a/f ratio to about 11.5:1, but as soon as the car makes boost at WOT it spits and sputters and doesn't GOOOO!

Anyway, we've played with timing til we were blue in the face, and haven't found the key yet. Anyone else run into this wall while tuning their car?

Car runs great in boost at 1/4 throttle BTW, but as soon as you try to step on the accelerator to make it go faster, it just spits and sputters at anything over 4 grand

Hint Hint, maybe?

 

what did you gap your plugs at?

 

I had that same problem, my plugs were gapped to big. Try closing the gap and it should fix your problem

 

in other news get missing link if u dont have one. fish tank check valves blow.

 

hes got a standalone

 

Plugs are at .033, acted the same at .050, stock setting...

 

^^ up

 

whats your fuel pressure at? high flow pump? injectors?

 

Jody try gapping them down to like 26 just to see if that helps.

 

Got a Holley replacement pump for a DSM, got 550cc injectors, running stock fuel pressure, but the wideband says the car is at an extremely safe 11.0 til we get this resolved.

Josh, I'll go by my storage unit today and try gapping them down a little more. that small of a spark shouldn't be bad since I installed the Coil, so hopefully it'll still light off like a champ

 

Are you getting a check light? If your MAP reads boost, then the car will go into limp mode (i.e. over-rich = sputters and drives like total crap). Get a missing link or add more check valves.

 

news flash noob. don't need ethier with a standalone.

 

Jody have you regapped the plugs? A customer at work was having the same problem with a supercharged 5.0 and I regapped the plugs down to .028 and problem was solved.


[Modified by hybrid901, 5:23 PM 10/1/2002]

 

Agreed on gapping the plugs to .026 or .023, Also maybe pull a little fuel out of it, try 12:5 ish or at least 12:1ish. At this boost level, you could go 13.5's. What stand-alone? How did you "play with timing"?


[Modified by Speedworks801, 11:47 AM 10/1/2002]

 

gapping to .023-.026 is a little too close, .028-.029 is what most dyno tuners recommend.

 

Ohhhh k. Here's what's going on now.

We left the plugs gapped at about .033, and we added some timing wince the fuel is good. Wideband says 11.8:1 to 12.2:1 all the way through the revs.

Here's what's freaking me out BADLY. We're running STOCKish timing up to 7psi, and the car is loving it. No signs of detonation, no nothing. The car 90% of the time doesn't spit and sputter like it did, but we're scared to increase timing any more than it is. It's at 28.8 degrees total timing at 7psi on 93 Octane. Someone tell me something else is going on, cause me and my tuner are wracking our brains trying to figure out why the car needs so much freaking timing...

 

my car was the same way. around 4 grand when you floor it it doesn't wanna go. i was at the dyno and none of us knew what was wrong. i talked to my other friend and we tried advancing the timing and it worked. no detonation runs good up to redline no more sputtering. i've checked my plugs and they all look good. i'm running 91 octane at 8psi.

 

Anyone else have experience with having to feed the car timing to keep away sputtering gremlins while facing impending detonation and ultimate engine doom?!

 

Someobdy's gotta know... Could my cam timing be off?

 

maybe your cam gears are off? Maybe your head is milled rocking back hte timing?