420A 420A turbo vacuum line problem 1psi boost

[Hunteremerson17]

Fuel pressure should be 47-50 psi with the stock FPR.
With an adjustable FMU like a vortech SFMU and larger injectors it will be lower than that.



Do you have a picture of the aftermarket one so i can ID it? Its a FMU that raises fuel pressure x number of psi per pound of boost pressure. Its so that you get the extra fuel you need to go with the increased air from the turbo.
You definately need it, dont boost without it or you will destroy the motor from running too lean.
Do you have a wideband o2?

Also clear the codes and see if they come back. I can see in the last pics you posted that you have a missing link installed (so the map sensor doesnt see boost). So if its working correctly the map sensor code may be because of the disconnected vacuum lines.
Same with the evap code. In stock form, the fitting with the 3 hoses on the back of the intake manifold connects to:
- egr solenoid (side of head below cam sensor)
- cruise control vacuum resivour (underneath intake manifold)
- hard line on firewall ( goes to evap vent solenoid by gas tank)

Could this be the reason why it’s so hard on gas? Like 20mpg tops... plus I run 93 in it and it’s like $3.08 atm

 

[dustyboner]

Did the aftermarket regulator look like this?

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[Vegas Smith]

Definitely could be. The key to making these cars run well is stamping out all the little leaks and such.

 

[dustyboner]

since you have a star turbo kit on your car, i dug up the install guide for it. Again you need the FMU (after market regulator) installed to run any boost on your engine. any amount of boost is adding more air to the mixture and without the FMU there is no extra fuel being added to compensate. You will run extremely lean and destroy your motor.
If you don't wanna run a FMU you need to get something like a megasquirt and larger injectors, then have it tuned before you boost.

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[Hunteremerson17]

Did the aftermarket regulator look like this?

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Yes, finally got around to putting it back on, now it runs absolutely perfect and building 6psi of boost on a 3lb spring in the wastegate! Thanks for the help, I really needed it!!

 

[Hunteremerson17]

since you have a star turbo kit on your car, i dug up the install guide for it. Again you need the FMU (after market regulator) installed to run any boost on your engine. any amount of boost is adding more air to the mixture and without the FMU there is no extra fuel being added to compensate. You will run extremely lean and destroy your motor.
If you don't wanna run a FMU you need to get something like a megasquirt and larger injectors, then have it tuned before you boost.

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Thanks for the directions, I put the aftermarket fuel pressure regulator on it and it runs absolutely perfect and building 6psi of boost on a 3lb spring in the wastegate! Thanks for helping man!