PaulT

Now everybody is going EFi what was the secret fuel mod that was such a closely guarded secret????

Cheers PaulT

Karlos G

iTrader: (4)

lol What secret is this then?!
Running a hose from the inlet manifold to the FPR??

rst in breaking

iTrader: (2)

to metering unit? heard people saying they have been uprated to supply the fuel but never played with it as dont like it lol

RS1HEN

5th injector?


never heard of a secret fuel mod

Micky

I thought the secret fueling mod for MFI was to switch to EFI!!! Micky

massirst

That would improve performance?, I am interested....

CheeRS

Rob_DOHC

iTrader: (4)

The fuel pressure reg has an atmospheric take off, the tube with no hose. If you show this boost pressure it helps the car to run rich at the top end and leans out (slightly the bottom end). Mine has it.... helped a bit.

Rob,

Karlos G

iTrader: (4)

Thats the one!

rs combi

so nothing fancy just a pipe off the inlet on to the pressure reg ?

rickbartlett

ive heard about it but never seen it done,will ask jamie at jamsport when mine goes in for set up cos i want boost set to 18 psi so anything to make it abit safer

Rob_DOHC

iTrader: (4)

Pretty much yep, you can't really do it without messing about with the fuel pressure tho. Doing this on its own will just cause your car to run lead off boost and even richer than it probably already is on boost.

If you do this you can turn your fuel pressure down slightly. I have always thought a redesigned pressure regulator would be key to a really well set up MFI, ie not shit rich off boost etc.

Rob,

JamboRS

AVA modified the fuelling on mine,never had any hose going to fpr though,was done via the fuel ecu and metering head modified.know of other cars that got this mod done aswell,seemed to work well.

rickbartlett

reckon im defo gonna go for this when it goes to jamsport.more fuel is definitely better if u want good boost on mfi

Rob_DOHC

iTrader: (4)

See what they suggest mate. How did they modify the metering unit mate? didn't know the fuel ecu could be changed....

Rob,

Karlos G

iTrader: (4)

IIRC you can change a couple of resistors and it will increase the fuelling 'curve'.... dont know what you can do to the metering unit itself though other than set the EMFPA as normal.

Rob_DOHC

iTrader: (4)

Thats a shame, in theory it should be possible to alter the shape of the fuelling curve too not just its y position if you get me.... if after market management wasn't so cheap would be fun to give it a looking at. Pretty sure you cant 'modify' the metering unit either just wanted to hear the answer.

Rob,

T28 RST

Same here

rickbartlett

when ive spoke to jamsport about havin mine done i will get my graph up from rolling road

JamboRS

dont know guys,all i know it was takin out car,stripped and modded,doubt alan will give his secrets away.