I'm still getting familiarized with how it works but my impression so far is that I can just use stock injectors and stock fpr with it (for 7-8psi boost), is that right?

I did search a lot but everyone seems to run bigger injectors.

1993 Eagle Talon TSI AWD: balance shafts, cruise & AC removed; 16psi, Dejon intake & UICP, ported 14b, EVOIII mani, ported 2G O2 housing, 2.5" Buschur dp to 3" Thermal exhaust, datalogger, front strut brace, prothane motor mounts

1995 Eclipse RS U-Boot; Tokico Illuminas, GSX front brakes, ST front swaybar, short shifter, CAI with K&N filter, rear disks and swaybar, front upper and rear lower strut braces, beater exterior

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If a sentence found online has 35% misspellings or greater and includes at least two racially charged expletives, chances are it is a YouTube comment.

'95 Eclipse TurboGS (garage deco)
'95 TSi AWD (restoring a survivor)
'97 Talon ESi-T (poor impulse control)
'99 Eclipse RS-T (daily beater)
'13 Evo X (mostly stock)
'17 Sienna (Middle Aged Dad Mobile)



Factory Service Manuals: http://nawdu.de/files/

how about bigger injectors, stock fpr, shorter pulse off boost?

1993 Eagle Talon TSI AWD: balance shafts, cruise & AC removed; 16psi, Dejon intake & UICP, ported 14b, EVOIII mani, ported 2G O2 housing, 2.5" Buschur dp to 3" Thermal exhaust, datalogger, front strut brace, prothane motor mounts

1995 Eclipse RS U-Boot; Tokico Illuminas, GSX front brakes, ST front swaybar, short shifter, CAI with K&N filter, rear disks and swaybar, front upper and rear lower strut braces, beater exterior

Whatever gave you the idea you could use a stock pressure regulator?

______________________________
If a sentence found online has 35% misspellings or greater and includes at least two racially charged expletives, chances are it is a YouTube comment.

'95 Eclipse TurboGS (garage deco)
'95 TSi AWD (restoring a survivor)
'97 Talon ESi-T (poor impulse control)
'99 Eclipse RS-T (daily beater)
'13 Evo X (mostly stock)
'17 Sienna (Middle Aged Dad Mobile)



Factory Service Manuals: http://nawdu.de/files/

ok ok I'll just go read more




...
and so I found I need a 1:1 FPR.

1993 Eagle Talon TSI AWD: balance shafts, cruise & AC removed; 16psi, Dejon intake & UICP, ported 14b, EVOIII mani, ported 2G O2 housing, 2.5" Buschur dp to 3" Thermal exhaust, datalogger, front strut brace, prothane motor mounts

1995 Eclipse RS U-Boot; Tokico Illuminas, GSX front brakes, ST front swaybar, short shifter, CAI with K&N filter, rear disks and swaybar, front upper and rear lower strut braces, beater exterior

you need a 1:1 fpr. otherwise when you're at 8psi of boost your fuel rail pressure has been effectively LOWERED by 8psi (due to the pressure difference) and you will thus be getting less fuel. pressure is a relative measurement - normally taken in reference to atmospheric pressure (gauge pressure) rather than absolute pressure. if your fuel rail had a pressure of 40psi (gauge) and you were also boosting 40psi (gauge) then the effective pressure difference between the rail and intake manifold would be 0 psi. you would simply be dripping fuel into the mani.

-marc

ok

now again about the stock fpr, couldn't I just use a rising rate addon fpr like the basic vortech fmu with 1:1 setting?

the thing is I got a '95 and I just don't want to cut the fuel rail

1993 Eagle Talon TSI AWD: balance shafts, cruise & AC removed; 16psi, Dejon intake & UICP, ported 14b, EVOIII mani, ported 2G O2 housing, 2.5" Buschur dp to 3" Thermal exhaust, datalogger, front strut brace, prothane motor mounts

1995 Eclipse RS U-Boot; Tokico Illuminas, GSX front brakes, ST front swaybar, short shifter, CAI with K&N filter, rear disks and swaybar, front upper and rear lower strut braces, beater exterior

Originally posted by T_K
ok now again about the stock fpr, couldn't I just use a rising rate addon fpr like the basic vortech fmu with 1:1 setting? the thing is I got a '95 and I just don't want to cut the fuel rail

Kevin
The old:


The new:

I got a SFMU very cheap so I'll just use that for the time being till I get a better idea how the whole thing works.

1993 Eagle Talon TSI AWD: balance shafts, cruise & AC removed; 16psi, Dejon intake & UICP, ported 14b, EVOIII mani, ported 2G O2 housing, 2.5" Buschur dp to 3" Thermal exhaust, datalogger, front strut brace, prothane motor mounts

1995 Eclipse RS U-Boot; Tokico Illuminas, GSX front brakes, ST front swaybar, short shifter, CAI with K&N filter, rear disks and swaybar, front upper and rear lower strut braces, beater exterior

did you read my explanation of why you're supposed to use a 1:1 fpr? the idea is to take the pressure differential out of the equation and focus fuel adjmustment on using pulsewidth ONLY. the MS does not use rising fuel pressure to increase fuel. it uses pulsewidth. if you use your SFMU while the MS is assuming static pressure you're going to be running very rich. if you want to use your SFMU don't use the MS. if you want to use the MS get a 1:1 fpr. AFAIK the MS is not made to compensate for changes in fuel pressure. this is why you use a 1:1 FPR to keep the pressure difference between the rail and the manifold contstant.

here's an example:

0vac/boost and fuel pressure at 45psi.

pressure difference is 45psi.

10psi boost using a 1:1 fpr and fuel pressure is at 55psi (relative to the atmosphere).

pressure difference is still 45psi.

this makes things much simpler.

if you want to use your SFMU you're going to need to have the MS monitor fuel pressure as well and come up with your own fuel tables which compensate for the changing fuel pressure.

the whole point of the MS was so we could ditch less accurate means of fuel management such as rising rate FPR's.

-marc

I will use the SFMU for now and when I get more familiar with engine management I'll get a MS and 1:1 fpr. Thanks for the advices

1993 Eagle Talon TSI AWD: balance shafts, cruise & AC removed; 16psi, Dejon intake & UICP, ported 14b, EVOIII mani, ported 2G O2 housing, 2.5" Buschur dp to 3" Thermal exhaust, datalogger, front strut brace, prothane motor mounts

1995 Eclipse RS U-Boot; Tokico Illuminas, GSX front brakes, ST front swaybar, short shifter, CAI with K&N filter, rear disks and swaybar, front upper and rear lower strut braces, beater exterior