Originally Posted by
joeduno
Hoping to get some advice. I'm trying to get my van tuned in, and I'm slowly working my boost levels up, but I've hit a wall. Right now I'm running around 12psi and I'm getting a sputter / slight misfire right around 4,000 rpms. It lasts for 2-300 rpms, then goes away and the van pulls pretty good.
Here's a bad part, my wideband O2 sensor is acting up, so I only have my old narrow band gauge to depend on. Going off of that gauge, I'm good on fuel with one red bar showing before the sputter, then two showing afterwards.
At 10 psi and below, van drives like a dream.
Some relevant mods for my van:
t3/t4 50 trim
Fwd F4 cam (to much cam for my engine, but thats whats in there)
Larger valves
Slight head porting
Injectors are supposed to be +40's but van has always run really rich. I have my current cal scaled for 55 lb injectors.
I'd like to post my cal so those that know might be able to look at it and let me know what they think, but I'm not allowed to post attachments. If anyone would like to look at it I could email it to you, otherwise just some advice like "lower the xxx setting to no more than yyy"" Would be great.
Thanks Joe