Car wasn't accelerating right over 4500rpm - Been trying a lot of things (which in a way has been good as I've checked the output from every
bloody sensor on it) but was getting nowhere. Anyway, tonight changed back the fuel pressure regulator from 4 bar to 3 bar and bingo!
The injectors (green top) clearly couldn't cope with a higher delivery pressure so I was effectively quenching when it was on high fuelling (mine
is a 91 cosworth and apparently they didn't get everything sorted to about 93).
It was fairly mad before even with this glitch so it is just bonkers now - Cannot believe the acceleration from 3500 to 6000. Took mother-in-law up
the road to check it out - She may never speak to me again
Well that can only be a good thing if she talks to you again ask john to borrow the beast when its done that should sort it lol
Just been told, my mother-in-law is moving out permanently in 3 weeks time.
This means I've got about 2 weeks to get my engine running (no exhaust & directly under her room).
Did have it running last friday night, but that doesn't count. I woke up a short while later.
OH yes, sorry. Well done on getting your running issues sorted Neil.
[Edited on 2/7/07 by jollygreengiant]
Why on earth did you turn the fuel pressure up in the first place????
It would have meant you were delivering approx a third more fuel than you actually needed all across the rev range. Madness!
Glad you have it sorted now.
quote:
Originally posted by NeilP
Car wasn't accelerating right over 4500rpm - Been trying a lot of things (which in a way has been good as I've checked the output from every bloody sensor on it) but was getting nowhere. Anyway, tonight changed back the fuel pressure regulator from 4 bar to 3 bar and bingo!
The injectors (green top) clearly couldn't cope with a higher delivery pressure so I was effectively quenching when it was on high fuelling (mine is a 91 cosworth and apparently they didn't get everything sorted to about 93).
It was fairly mad before even with this glitch so it is just bonkers now - Cannot believe the acceleration from 3500 to 6000. Took mother-in-law up the road to check it out - She may never speak to me again
quote:
Originally posted by garage19
Why on earth did you turn the fuel pressure up in the first place????
It would have meant you were delivering approx a third more fuel than you actually needed all across the rev range. Madness!
quote:
Originally posted by MikeRJ
quote:
Originally posted by garage19
Why on earth did you turn the fuel pressure up in the first place????
It would have meant you were delivering approx a third more fuel than you actually needed all across the rev range. Madness!
About 15% more, since flow is proportional to the square root of the pressure. Turning it up does seem a strange thing to do unless the OP was trying to compensate for something else.
first thing is a radical re-design of the inlet system as that is where most of the de-tune went on neil then cams and there you go around 300 bhp.
I got quoted loads of money when i looked into it but if you wanna have a talk to the guys that know find the number for merlin race engines ( think
there listed on jenvey's web site)
BOA engine with BOB exhaust cams and washers can add a bit to extra power.