curious... i think i may have mad vacuum leaks which obviously would turn into boost leaks.....

it idles at 14 in/hg MAXIMUM. right after it starts its more like 10.

If i do have a vacuum leak, where are good places to check this?

thanks guys!

 

mine idles around 21-22 in/hg. check your bov, wastegate, by your intake manifold. pretty much anything you T'd off.

 

mine sits at -20

check your timing , when my timing is retarded it was alot lower.

 

22

 

20-25

 

18 when the motor is cold (ie. morning startup)
20 at idle when the motor is warmed up
22 when i let off the throttle

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by _Project EJOne &raquo;</TD></TR><TR><TD CLASS="quote">18 when the motor is cold (ie. morning startup)
20 at idle when the motor is warmed up
22 when i let off the throttle</TD></TR></TABLE>

Ditto

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by _Project EJOne &raquo;</TD></TR><TR><TD CLASS="quote">18 when the motor is cold (ie. morning startup)
20 at idle when the motor is warmed up
22 when i let off the throttle</TD></TR></TABLE>

just about what mine was too

 

im lower compression so that might make a difference

 

mine was pretty consistent at 20 or so.

 

i idle around 18 in/hg
76mm bore, 9:0.1 compression

under deceleration i get about 25 inches

 

about 20 for me too

 

To check for a vacuum leak use carb cleaner and spray all hose/gasket connections after the tb one by one. The idle will rise once you have sprayed carb cleaner through the opening that is causing the leak.

good luck

peace
Ian

 

Man on my VAFC i idle at like -500 something....

 

hmmm, so now that i know what you guys run, any suggestions abotu finding vacuum leaks, i will do the carb cleaner one. Note: i was idling the same PRE TURBO. i think its just posing more of a problem now.

what controls the vacuum system? a pump? i'm a dumbass when it comes to this...

any suggestions on any component that may have failed? thanks a bunch!

 

https://honda-tech.com/zerothread?id=1014646

This might help a little, im at around 20.

 

that doesnt help at all....

 

It will be a leak probably from one of the vacuum lines that come off your inlet manifold or perhaps the inlet manifold gasket is shot. Either that or your motor is shot. Compression test would most likely tell you if its the engine.

 

what controls vacuum is your piston being forced down the cylinder creating vacuum

 

i got 193 across all cylinders, in my Y8

 

about -20, cold start makes it about -10, and when the a/c compressor is working it's right around -17. i know i have a tiny vacuum leak somewhere, too.

 

i actually started paying attention to my boost gauge more often after reading this, on my d15b i generally have -25 at idle, after a hard run its more like 20. i wonder why im pulling more vacuum than most, can a vacuum block make a difference?