200 efi turbo on teh cheap...

[XFlow_Fairlane]

ok I think this TFI dizzy is gonna work out and if it does I have this planned...

tfi dizzy
3.8L cfi ecu
3.8L or maybe 5.0L cfi unit
some hacked up wire harness....
adjustable pressure regulator to tune my AFR

now if I put a check valve on the MAP sensor so it see no boost it will just work as if I was at WOT right? (max fuel)

I can get an accel 300+ box with the 375 upgrade on it that has boost retard to keep my timing safe.

now I know this won't be perfect but the CFI will still be dumping in fuel under boost (with FP rising so it will keep dumping more and more under boost) now running moderate boost (8#) and maybe retarding my base timing do you guys think this will work halfway? I got a couple spare motors so I guess I am in linc mode of "can it be done?"

 

[hasa68mustang]

I think we need to put that on urban dictionary. going into linc mode-testing to see if it can be done.

 

[MustangSix]

A check valve on the MAF would tend to hold vacuum. It's not necessary because the stock MAF won't read anything above atmospheric pressure anyway, and even if it did, the stock ECU fuel and spark maps probably flatten out at those points or go into some sort of default setting.

A boost referenced FPR will compensate for some increase in boost, but not a lot. Increases in fuel flow thru an injector are not directly proportional to increases in pressure, so it only works up to a certain point, then tails off.

A 3.8 EFI system could probably work on a 200, but ultimately you would run into tuning issues.

 

[XFlow_Fairlane]

I was hoping with mild boost and non-optimal timing (base timing retarded) that it *could* work....maybe not well but could. I am not loking to set any track records just be able to bolt on a factory EFI setup, tweak the adjustments a little and have it kinda work and not melt a piston.

so you think a nitrous spray nozzle would work as a bandaid? basicly looking to get it to work under acceleration only and not constant loads. I figured playing with jets and the hobbs switch kick on point I could get it working halway decent (adjust kick on to point where factory mapping falls short then tune with jets for WOT?)

 

[Anonymous]

now if I put a check valve on the MAP sensor so it see no boost it will just work as if I was at WOT right? (max fuel)

Get a 3-bar MAP from a Buick GN?
Don't the 2.3 liter turbo guys use a boost referenced MAP?

now I know this won't be perfect but the CFI will still be dumping in fuel under boost (with FP rising so it will keep dumping more and more under boost)

I have a Vortech FMU with (I think, IIRC) 6:1, 8:1 and 10:1 ratio discs. It blocks off the fuel return line, forcing rail pressure up (since it has no way to return). For example, with the 8:1 disc, fuel pressure would rise 8 psi for every 1 psi of boost.

I think the speed-density (86-88) 5.0 Mustang guys have made it work that way.
It isn't perfect since there will be rich and lean spots in the power curve. You just have to make sure the lean spots aren't bad and that you can accelerate through the rich spots without bogging down.

I guess I am in linc mode of "can it be done?"

I think we need to put that on urban dictionary. going into linc mode-testing to see if it can be done.

LOL!

A boost referenced FPR will compensate for some increase in boost, but not a lot. Increases in fuel flow thru an injector are not directly proportional to increases in pressure, so it only works up to a certain point, then tails off.

The FMU units were made to make up for the inability of the FP reg to keep up.

so you think a nitrous spray nozzle would work as a bandaid? I figured playing with jets and the hobbs switch kick on point I could get it working halway decent (adjust kick on to point where factory mapping falls short then tune with jets for WOT?)

Sure, but when the switch closes expect to go really rich, then lean out as airflow increases. Multiple switches and nozzles would be a little better.

 

[XFlow_Fairlane]

the 2.3L just run a stock MAP....but it is called a BAP. since they are an air metered setup the MAP/BAP is just for finding altitude for the airmeter (barametric absolute pressure) so they never had to worry about 1-2-3 bar sensors. would a GM map work on a ford ecu?

 

[XFlow_Fairlane]

bringing up the dead...

I am only looking to get it to run with about 8psi on a stock ECU. I have a 8:1 or so motor and def not tuned for power (timing pulled out for safety) so do you think I can get ti to live and be kinda drivable under boost with just a hobbs and nozzle on a stock 3.8L CFI setup with a msd 6btm?