crazy crazy fuel discovery
Posted: Thu Jun 08, 2006 9:33 am
ms1 2.2 extras .24....
42#injectors on a 2 liter.. the req_fuel calculated 9.7ms.
the car ran great for a long time, then i pulled the head and did alot of porting and port matching. after re assembling it, using the same tune, the motor would NOT spin above 4000rpm no matter how i scaled the timing or fuel. i was playing arround with the after start enrichments and for somereason decided to change the req fuel to see what happened. i tried slowly turning it up and it got worse. so i turned it down .25 ms at a time till i got down to 6ms. 6ms is where it seams to be running the best. now it will spin up to 6500 without a problem. there is a little bit of knock but im prety sure its because of my timing. it advances from 10* to ~40* @ 4000rpm, which seams a little high..
so my question is this: why does it run 4x better with half the req_fuel that the calculator came up with?
42#injectors on a 2 liter.. the req_fuel calculated 9.7ms.
the car ran great for a long time, then i pulled the head and did alot of porting and port matching. after re assembling it, using the same tune, the motor would NOT spin above 4000rpm no matter how i scaled the timing or fuel. i was playing arround with the after start enrichments and for somereason decided to change the req fuel to see what happened. i tried slowly turning it up and it got worse. so i turned it down .25 ms at a time till i got down to 6ms. 6ms is where it seams to be running the best. now it will spin up to 6500 without a problem. there is a little bit of knock but im prety sure its because of my timing. it advances from 10* to ~40* @ 4000rpm, which seams a little high..
so my question is this: why does it run 4x better with half the req_fuel that the calculator came up with?