Whats this nipple?
 

Hi there, im sorting out the vacuum lines for my single turbo build and I have a question.

This is the front rotor, Im good with these ones;

https://cimg9.ibsrv.net/gimg/www.rx7...70a506fe62.jpg

And this is the rear rotor... Whats this port for? thanks :icon_tup:

https://cimg2.ibsrv.net/gimg/www.rx7...22c547302b.jpg

Originally went to stock fuel pressure regulator, although it went through a solenoid in the rack first.

thanks, should i cap it, or use it for the new FPR?
I guess it wouldent matter either way then?

I'm going to use it for the aftermarket FPR on my car, and also for the map sensor signal. I've read somewhere while researching that it may not be the best source because of how strong the vacuum signal "pulses" are versus a nipple on the plenum. Maybe someone with tuning and ECU setup experience can chime in here. I've been going back and forth on the decision myself.

You need a source for the FPR, whether it's OEM or aftermarket. Pull it from there or elsewhere.