Dragonball Posted May 29, 2003 Share Posted May 29, 2003 OK Guys / Gurus That very nice man Mr Kindell has fitted my DEFI's for me - and lovely they are too! However there is a section on the meter that allows me to measure differential pressure between the fuel and boost - that shows on the fuel pressure gauge Not a scooby how this works / what it measures etc - something about 300kPs? Any info gratefully received Cheers Paul Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted May 29, 2003 Share Posted May 29, 2003 The difference between boost pressure and the fuel pressure should equal the static rail pressure as long as you are using the normal 1:1 fuel pressure regulator. I can't remember the static fuel rail pressure at the mo, but i think it's close to 40psi. It's a good way to monitor whether your fuel system can support the level of boost you are running. Quote Link to comment Share on other sites More sharing options...
Dragonball Posted May 29, 2003 Author Share Posted May 29, 2003 Ahh - so that will be the 300 (or 3 on the gauge) that it should remain at if the fuelling is correct At tick-over it's at 2.8 - will check it out tommorow Errr...which way is good or bad? Less pressure means fuel not coping? Cheers Quote Link to comment Share on other sites More sharing options...
dude Posted May 29, 2003 Share Posted May 29, 2003 or guage full of wee John:flame Dev Quote Link to comment Share on other sites More sharing options...
Gaz Walker Posted May 29, 2003 Share Posted May 29, 2003 Originally posted by dude or guage full of wee he's getting better at these Gaz. Quote Link to comment Share on other sites More sharing options...
Adam W Posted May 30, 2003 Share Posted May 30, 2003 Remember that at idle the engine is pulling a vacuum which will mena you're running lower the base fuel pressure. Pull the vac hose off the fuel pressure regulator and see what the gauge says then, that's your BFP (I think that bits right anyway!). Fuel pressure should rise directly in proprtion to boost pressure, ie at 0psi boost you have 40psi FP, at 18psi you should have 58psi. If your fuel pressure starts dropping off at high boost you need a better pump! Quote Link to comment Share on other sites More sharing options...
Dragonball Posted May 30, 2003 Author Share Posted May 30, 2003 The DEFI system actually shows the variance between the two automatically I can either have it as fuel pressure standard - or set it so that it shows the correlation between the two (boost and fuel pressure) The instructions show this as being 3.0 ideally (ie 3x100 should be the gap between the two) At idle i am hitting 2.8 - and this has risen to 3.2 at peak This should remain at 3.0 and the variance indicates that the fuel pressure falls behind at higher boost Together with a EGT temp peaked at 1000 at 1.2 BAR (normal running 850/900 I am now going to do the following damn quick 1. Fit the UK fuel pump 2. Fit the new FMIC Cheers Paul Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted May 30, 2003 Share Posted May 30, 2003 Originally posted by Paul E The instructions show this as being 3.0 ideally (ie 3x100 should be the gap between the two) Do you know what units of measurement that is in ? Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.