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Really would like to know if anyone (with a boost gauge) has run their engine NA and noted what the vacuum pressure is throughout the RPM band and load range. Been thinking it would be really high just off idle and be practically zero vac at redline. I'd really appreciate it if some one could tell me!
Thanks,
-Ike
Your sig is the most important part of your message. Make sure that you list EVERY single thing that you have done to your car so that we can all go \'oooh!\' and \'Ah!\'. Please make your sig consistently longer than anything else you post. Please include your lengthy sig with EVERY single post you make during a reply, even if you only reply with a monosyllable grunt.
Ok, throttle position then. I thought I took care of that when I said "load range." Still, any ideas?
High vacuum-low throttle
No vacuum-full throttle
Your sig is the most important part of your message. Make sure that you list EVERY single thing that you have done to your car so that we can all go \'oooh!\' and \'Ah!\'. Please make your sig consistently longer than anything else you post. Please include your lengthy sig with EVERY single post you make during a reply, even if you only reply with a monosyllable grunt.
no what you said doesn't make any sense because you can get 0 vac at idle the instant u stab the throttle, doens't even have to be WOT. NA motors never pass 0. or at 6000 rpm when you release the trottle you can run -20 vac. normal idle around 15 vac and cruising loads anywhere between 0-15.
Yes, yes, NA motors never go positive boost, obviously. What I'm trying to get is an estimate of what the engine's vacuum numbers are throughout a given "driving experience."
You said "you can get 0 vac the instant u stab the throttle, doesn't have to be WOT." Can you define "stab?" Also, what is this "can get 0?" Did you mean "will be 0?" If it will always be 0 vac at anywhere part throttle (which is what you seem to be implying), then thats fine. But I don't see how this could be true. I just figured the vac curve would be something predictable, and I'm looking for number to back that up.
Your sig is the most important part of your message. Make sure that you list EVERY single thing that you have done to your car so that we can all go \'oooh!\' and \'Ah!\'. Please make your sig consistently longer than anything else you post. Please include your lengthy sig with EVERY single post you make during a reply, even if you only reply with a monosyllable grunt.
When going down the road, it will dip to 10 at a slight throttle opening, and to 5 at somewhere around 1/4 open. Half-open and it goes to 2 or 3. WOT is essentially zero. This is fairly independent of speed or rpms.
So my truck is finally getting some work done, after 17 years, Oil pressure sensor went out and it’s located under the lower intake manifold. Have to...
2 weeks ago
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