DrifterS4

Hey whats going on everyone. I have already done a search for my problem but cant seem to find an answer. My problem is that I am trying to find a vacuum source and also trying to find a good place for my map sensor. I have an 88 Turbo II with a FMIC. The only vacuum line that I have connected is my vacuum for the omp injectors. There are 2 more ports found on that side and also 3 ports on the opposite side of the throttle body towards the front of the vehicle. I have already tried to search for vacuum but am not sure which one to use. I was wondering if anyone can help. Thanks again for you time.

The Wankler

iTrader: (14)

go into the archive and look for the "rats nest removal" thread. It will tell you in there.

NZConvertible

Mazda fed it from a nipple on the ACV. If you've removed the ACV you can either tee it into the BOV line or fit a brass nipple to the block-off plate like I did.

https://www.rx7club.com/attachment.p...hmentid=118531

The oil nozzles are fed air from in front of the throttle, i.e. no vacuum. Several of the other nipples on the UIM are the same. Read on...

The top two (small one for primary injector air bleed, big one for oil nozzles air bleed) do not see vacuum; the bottom one (double throttle system vacuum diaphragm) does.

The middle one (purge control valve top nipple) does not see vacuum, the top one (relief and twin-scroll solenoid valves) and bottom one (purge control valve bottom nipple) do.

HAILERS

If you ever run out of nipples for a vacuum source, AND have a series four turboII, then it's staring you in the face.

Go look at your BAC. Look just aft of the BAC. See the 1/4" nipple that feeds the Air Bypass Solenoid (mounted up and aft of the bac and is fed from the intercooler). Just step down from the 1/4" to 3/16". Done. I'd think it beats splitting off from another source by a large margin.

Lose the Air Bypass Valve. You don't need it's 17 second, once a day function.

That *seems* to be a real good place to source the vacuum for one of those Apexi BOV seeing how the Apexi has a matching nipple size wise.

HAILERS

OR...the next time you have your upper intake manifold off, go to where the SubZero Assist unit was bolted down. Drill out the single vac feed source for that unit, located IN the manifold and then tap and screw in a nipple for your new vacuum source.

Just in case: you chunk the Sub Zero unit and just drill the hole in manifold out to fit your new nipple size.

Help stamp out vacuum splitters, NOW!