Acceleration Faltering, Details 2nd page Options

[Tigawoods]

lets cut to the chase.

-car ran fine after cam install

-small valve tap

-after 2 weeks small knocking noise that seems to be coming from below the cam gear and only sounds when its around 1000rpm

-had an exhaust problem - detached the midpipe to run open downpipe until i got it fixed

-car ran super lean at low rpms under a fair load and sputtered as if its grasping to find power. sputters from stop to go at low rpms and drops super lean

-new mid pipe welded on

-car still sputters from stop to go at low rpms but now it gets a bit rich or just sputters with an even 14.X A/F r

- AND at 4900rpm under 100% throttle the car falls on its face and looses power. if anything under 100% throttle there is no problem.



i have a race this sat. and sun. i really need to figure out if this is a tune problem or an internal problem.
any insight at all will be helpful! thanks!

This post has been edited by Tigawoods: Jan 23, 2011 - 11:58 AM

[Tigawoods]

all the car/cyl/sensor adj. are the same as they where when we first plugged it in back in KOP

havent checked the ecu

i have a prosport wideband AFR Gauge

set the timing to 10 BTDC with the distributor and the timing light. it was in diagnostic mode.

the corrections that i am running now are ALOT different than what i was running when i first had the cams running right.

at idle im at -20% to get it from running rich. at a cold start its at 12.5 then gradually goes to 14 after. still at -20%
i have a curve from that to 0% from idle to about 2800rpm

the mid range is perfect without correction

at the top end from 3600+ i have a 17% correction.
the afr hold at 14 with that correction under maybe 50% throttle. under full load it goes to 12.5 then eventually 11 when it gets closer to redline