dunkd

I haven't actually driven my new FI car yet bc of the SNOW, just idling in the garage...

anyway are my vacuum numbers right?

at idle (~600-700) it is at about 16-17. then i rev engine it jumps to 0, then when i left off gas it goes down to 20, then levels out a second later to 16-17 again.

the motor is stock gsr and the turbo is t3/60-1 if it makes a dif, autometer phantom boost gauge....

Nextelbuddy

mine is always at -20 vac i have had -17 vac before but only when i had a vacuum leak. others might disagree

dunkd

hmm maybe i have a leak.

IN VTEC

iTrader: (3)

You should be closer to 21" to 22" Hg of vacuum at idle, assuming your cam timing hasn't been changed or screwed up, or if you're running big lobes.

It's not a huge leak tho if it is a leak.

808b18c1boosted

acceptable 18-22. Mines at 16-17 and i have 50% leak down in one cyl. also comp. is pretty low.

Blackack26

mine sits right at 21-22 hg at idle

dunkd

so vacuum is affected my cylinder leakdown and compression?

ELSpool

Will a new motor pull more vaccum once they "loosen" up after a certain amount of time?

808b18c1boosted

once the rings are seated correctly it should pull more vacuum.

808b18c1boosted

Vacuume occurs when the piston goes down on intake stroke. The reason your vacume goes up right after you rev it is because your throttle plate closses and the engine is at higher rpm,the same reason your vacume is high on deceleration there load on the engine. If thats not clear to you get a straw suck on it with your finger covering the tip, now you have vacuum. now suck without your finger on the tip, now you hve no vacuum. Okay now blow in the straw now your a human turbo

dunkd

where would common vacuum leak areas be? where I T'd off the break booster and my vacuum port? if lets say one fitting isn't screwed in all the way it would be leaking vacuum right?

dunkd

Intake Manifold Gasket?

dunkd

hondata intake manifold gasket en route.

dunkd

changed IM gasket and now its at 19