01-30-2006, 01:52 AM #1
What vacum are you guys getting at idle?
Fitted a AutoMeter boost gauge today that also shows vacum.Gauge is showing - 11psi vacum.Wondering if this is normal as I saw Jerry was only getting -6.3 ?? I`m chasing a mysterious loss of top end so just checking everything
01-30-2006, 08:01 AM #2
Chris, with my Auto Meter gauge i was showing 10-11 inches of vacuum.
With my digital gauge im getting about 6.8-8.4. I think my digital gauge is more accurate.
01-30-2006, 10:48 AM #3
Hulk you have a bigger cam right? That will lose some vacuum. Don't compare the vacuum of a modified engine to one that is not. Porting, cam changes, ect will change the ammount of vacuum.
On another note the vacuum is read in Inches mercury (inHg). There is no such thing as negative psi.
01-30-2006, 10:50 AM #4
Yep, i have the Rotax Racing cam.
01-30-2006, 10:59 AM #5
Jerry, awhile back you had a rough idle problem, is that better now? Was there something wrong?
01-30-2006, 11:00 AM #6
I don't know whats up with that. My idle is fine, but every now and then it stumbles down to about 1400 RPM's then picks back up. It only does it every now and then.
01-30-2006, 11:03 AM #7
Mine runs -11/-12 every time. Autometer 4376.
03-01-2006, 11:24 PM #8
Hey guys I was just going over this post as I just installed my Boost gauge and am getting -10 vacum at idle and I assume this is GOOD?
I like the search KEY.
03-01-2006, 11:27 PM #9
I usually get 10-12 hg vacuum at idle.
03-01-2006, 11:29 PM #10
Good. I just installed the gauge in my Glove box and am all happy!
Just waiting on some Steel Washiers and its on!!!
What should I see at full boost? RRIC installed? 7lbs?
Users Browsing this Thread
There are currently 1 users browsing this thread. (0 members and 1 guests)
By Green Hulk in forum Yamaha PWC Performance (4-stroke)Replies: 52Last Post: 01-02-2014, 10:35 PM
By bruceg in forum Sea Doo Open DiscussionReplies: 10Last Post: 08-02-2012, 01:18 PM
By Tommy Pantsdown in forum Yamaha Open DiscussionReplies: 4Last Post: 08-27-2010, 08:54 PM
By two2curupt in forum Sea Doo Open DiscussionReplies: 44Last Post: 11-23-2005, 08:17 PM
By Jrsrxp in forum 4-Tec PerformanceReplies: 15Last Post: 09-30-2005, 05:57 AM