Topic: QJET Fuel Air
in Forum: C3 Engines
Started adjusting the Qjet air fuel today using the vacuum method. I ended up at 10.5 turns out on both sides with 18.5 vac at 800RPM in drive.
Q. Does this range of number of turns out seem normal for a QJET? A tuning article I read said to start at 3 turns out (holley?) and turn in from there?
Q. I actualy reached 18 on vac at 8 turns out on each, should I back off to close to 8-9 turns?



Moderator
You're getting there!!


Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

C3VR Lifetime Member #93

Moderator





I have a sign in my shop that says..."Loose Nuts Tightened Here!"


Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
I found an older post with a response from Ken which indicated I should locate the best vacuum, then find the dead spot, and then back down to the point where the best vacuum started. Done.
My final numbers were 5.5 turns out on each with 17" vacuum at 750-800RPM in drive with vac advance connected.
What seemed strange is that the idle screw is barely touching so I can't lower the idle any further with this setup. I also rechecked the timing for max vacuum and test run. Some bucking so I backed down a hair on the timing, now seemed to run strong.

