Author Topic: Anyone with DASC - how much vacuum at idle ? (Read 3536 times)

Danny318 · « **on:** December 04, 2012, 06:35:34 PM »

Just wondering how much vacuum you pull at idle. I figure the dasc would make there be less vacuum than stock.

I only looked real quick and mine looks like 12-15 hg/in (or whatever the unit).

Seemed low, so it either could be low because of the hot cams I got in this motor, some leak, or restrictive tubing for the gauge. Or its totally normal.

Let me know what you get for numbers (and any mods you may have that influence them)

doitover · « **Reply #1 on:** December 04, 2012, 06:42:37 PM »

Sorry, I don't have a vacuum gauge. Since the SC is bypassed at idle, I'd expect it to be similar to stock.

bme30 · « **Reply #2 on:** December 04, 2012, 07:00:36 PM »

Quote from: doitover;118167

Sorry, I don't have a vacuum gauge. Since the SC is bypassed at idle, I'd expect it to be similar to stock.

It should read same as stock because of the bypass valve... You can also check your afr if you are running little leaner than stock. If it is then your bypass is not working correctly and that could explain a higher psi at idle (even still in vacuum)

Danny318 · « **Reply #3 on:** December 04, 2012, 07:14:44 PM »

Thanks guys, thats right. SHould be about the same.

I'm thinking the cams have something to do with it.

AFR at idle is good (14.7ish) and i couldnt find any vacuum leaks at all.

Danny318 · « **Reply #4 on:** December 22, 2012, 01:40:01 PM »

Any other people ?

wazzu70 · « **Reply #5 on:** December 24, 2012, 09:29:35 PM »

Hot cams will definitely impact vacuum at idle. The hotter the cams generally the less vacuum at idle.

Cars with very large cams sometimes use a vacuum reserivor to rin accessories that require vacuum such as brakes.

Danny318 · « **Reply #6 on:** December 31, 2012, 09:09:31 AM »

Quote from: wazzu70;118743

Hot cams will definitely impact vacuum at idle. The hotter the cams generally the less vacuum at idle.

Cars with very large cams sometimes use a vacuum reserivor to rin accessories that require vacuum such as brakes.

Good to know!