i haven't run my Rx7 for 7-8 months, just started driving it these few days and i notice the vacuum at idle is kinda low, only 12 In.Hg, i couldn't remember wat it's like b4, but it's been low always, comparing to my turbo miata and WRX, is it normal for rotary?

it's a 13B running twins.

 

only if it is a ported motor

 

what idle rpm?

 

hmm I have stock ports and mine pulls 18inch at 500rpms and 20 at 975rpm

 

Im getting about the same on my stock port fd.. Last compression check I was borderline on the front rotor..

 

16" at 1000 with a McHuge streetport

 

I'm running about 10-12 at 500 on stock port twins as well... I don't think that's a good thing though. I'm around 16-18 if i up the idle to 1000...

 

my idle is set to 750-800 rpm, mild street-port, my vacuum is kinda low i think, but the engine was rebuilt 15k km ago, and it's been sitting for over 8 months.

i think i needa do a compression test, wat is a good compression reading for stock rotary?

 

Sounds like the compression is a little low but it could run like that for years without any real issue.

 

21 @ 1000

 

Half BP 12A supercharged low boost pully 7in, hi boost pully 3in both at 1400 rpms.