garners_69

i'm in the middle of a single turbo conversion on my 2000 fd , i removed the black solenoid box under the uim, and it appears that the hose on the fuel reg on the secondary rail went to the solenoid box. i dont want to put the solenoid box back in so what are the inputs to the solenoid or should i replace the fuel reg

oo7arkman

iTrader: (2)

Are you also upgrading your fuel system for the single turbo conversion? Typically the secondary injectors and rails get upgraded with larger injectors and an aftermarket rail. When this is done also an aftermarket fuel pressure regulator is also needed.

I cannot speak for the vacuum setup on a 2000 model, I have not ever had the pleasure of seeing that new of an FD. BUT, with an aftermarket fp regulator it needs connected to the upper intake manifold (usually right near the throttle body) for a boost/vac reference. It uses this to appropriately adjust fuel pressure as manifold pressure increases/decreases.

Hopefully this helps.

arghx

iTrader: (3)

The FPR was connected to the hot start solenoid, which cuts vacuum to the regulator if fuel temperature is high enough. Cutting vacuum raises fuel pressure. In real-world driving, the solenoid isn't necessary.

Check out the single turbo section. I've never worked on a series 8 but I can tell you that once you start pulling the vacuum and emissions equipment out it's going to be the same basic process to go single as on a series 6.

garners_69

i will be upgrading the sec fuel rail eventually , but this is my dd so i just want to get it back on the road again for now and run lower boost levels.

rx7rcer09

before anything do you have a aftermarket ECU?

garners_69

yes have a power fc and an avcr have had fd's for a while but first single turbo conversion

rx7rcer09

i would do everything right then, get everything done at the same time to prevent from future headaches. for example get the injectors, sort our the vac lines correctly and so on just do it right the first time and be done with it.

oo7arkman

iTrader: (2)

True advice right there. Single turbo conversions should not be done for budgeting reasons... If your stock twins are bad, replace them or build your single setup correctly.

Low boost levels from whatever single turbo you choose will be vastly different in the VOLUME of air you are pushing into the engine. The PSI/boost level may remain unchanged, but you will still run leaner on the same PSI/boost levels.

If you are in a hurry and just refuse to change the injectors and get a proper tune as you should be doing with this build then I would highly recommend running NO boost through the motor. You say this is not your first FD, then you should also know the implications of building this setup incorrectly or cutting corners that just should not be cut.

Bullet13b

look under the UIM there is a vacuum nipple there that you can connect too on series 8.

garners_69

thanx for the advice
cheers jason