Ehughes

I finished my single install w/ AVC-R. I have PFC and datalogit.

My first trip around the block and no boost.

I think I may have a vacuum leak. At idle, my boost gauge is -25 kg. or so. when revved it shoots to 0, but no boost. I have not pushed the car yet as it needs more tuning. Could this be a vacuum leak or some problem with the wastgate?

SpeedKing

iTrader: (4)

Stock engine? Ported?

Ehughes

Rebuilt, stock port.

Also, what is the best way to check for vacuum leaks?

RedRx00

i know on regular piston engines, normal vacuum is 18-21in Hg and i know its different for rotaries. i think its just a little bit lower

RX7 Rotary Rocket

iTrader: (1)

I get -15 to -17 on idle (stock 13B-REW engine)

ORX705

at what rpm? around 500-600rpm?

GoodfellaFD3S

iTrader: (213)

as said before, at what rpm are you seeing this? Also, what is your gauge measuring vacuum in?

Ehughes

at around 700-800 rpm. guage is in hg (metric)

GoodfellaFD3S

iTrader: (213)

Hm, then you are reading it wrong. -25 kg of vacuum?

Scrapiron7

I see about -16hg at idle around 800rpm on my reman with 8k miles.

rynberg

vacuum will vary by idle rpm and porting, electrical load, etc.

My vacuum is about 17" (425mm Hg) at normal idle with no load. My idle is about 850 rpm or so.

Ehughes

Sorry, I meant -25 hg on the boost gauge. The reason I think I have leak is that I am not boosting (i.e. no vacuum to WG/BOV.

ptrhahn

iTrader: (9)

I got 16 until i installed the midpipe and removed the airpump, now i see about 14. Streetported motor. 850 rpm.

GoodfellaFD3S

iTrader: (213)

-25 of what though? I know it's mercury, but inches, cm's, etc......