inches of vacuum ls7
08-05-2018, 11:46 AM
#2
TECH Senior Member
Idle? Full throttle? Which mods do you have? Kind of a stupid question without telling us ANYTHING....
08-05-2018, 06:07 PM
#4
TECH Senior Member
08-05-2018, 08:52 PM
#6
TECH Senior Member
When you change the heads, cam and intake as you have, the idle vacuum level changes. Stock LS7 levels no longer apply to your engine.
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08-05-2018, 10:13 PM
#8
TECH Senior Member
Is it currently running well? What is the vacuum level now?
08-05-2018, 11:09 PM
#10
TECH Senior Member
I think you need to be looking at other factors. What is the A/F ratio? Do you have access to HPtuners or EFI Live? Which cam are you running?
08-05-2018, 11:19 PM
#11
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The tuner that had it a while ago set the a/r a little rich to give me a window to work with I case I fix/find the problem it is 12.9. and the Cam is an fed Cam.
08-06-2018, 06:39 AM
#13
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My 434” idles at 10 inches. Ls7 top end, with a decent sized 254/268 solid roller camshaft. Sounds like you might have a vacuum leak.
12.9 is crazy rich at idle. He set that to compensate for the leak maybe, which would lean it out badly.
MSD intake?
12.9 is crazy rich at idle. He set that to compensate for the leak maybe, which would lean it out badly.
MSD intake?
08-06-2018, 02:38 PM
#14
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Che70velle Thanks for your information, its not an msd intake and just recently I have checked for vacuum leaks and smoked it with no leaks found. This one is very strange.