street/strip engine question
 

hope you's dont mind me in this section. very healthy 496ci/auto, 67 chevelle. holley hp 950 carb. need to determine lean/rich conditions with 8'' of vacume @ idle. egt probes/system in the headers? tks a bunch for any suggestions.

Re: street/strip engine question
 

Put an O2 sensor and data logger in it.

Re: street/strip engine question
 

tks glen, who makes that system?

Re: street/strip engine question
 

Call him, you won’t be sorry...

http://www.motorsportsinnovations.com/

Re: street/strip engine question
 

Here is another option for an monitoring air /fuel ratio:
http://www.daytona-sensors.com/wego-...-displays.html
easy to install and has many options

Re: street/strip engine question
 

Ive used an Autometer wideband gauge and O2 sensor in my truck to get a tune out of it. Works great.

Re: street/strip engine question
 

With an idle with 8" vac. it must be fairly lumpy, so the wide band won't be very accurate at idle but will be useful above that,

Re: street/strip engine question
 

@ idle is the issue. way rich. have been all through the tuning to no avail.

Re: street/strip engine question
 

What have you tried?

Re: street/strip engine question
 

Does that carb have the holes in the butterflies?
On Dominators I've had success with restricting the idle feed holes.

Re: street/strip engine question
 

Another option...

https://www.aemelectronics.com/produ...ntroller-gauge

Re: street/strip engine question
 

oh man have tried a bunch...5.5lbs. pressure, holes in butterflies, leaned idle air bleads a couple, jetting is in reason. floats just below sight plug. maybe could lower? plugs r cleaner after a non stop tour...

Re: street/strip engine question
 

Idle fuel bleeds are too large.

Re: street/strip engine question
 

Yes, idle feed restrictions could be a bit large. Did you plug the secondary P.V. and go up 5 or 6 numbers? How much base timing, and total?

Re: street/strip engine question
 

Do you have a power valve in the carb or is it blocked off ?

Re: street/strip engine question
 

950 holley HP. nice carb..... 3.5 pv, timing @ 18 inital/35 total. (pump gas)

Re: street/strip engine question
 

You said 8 inches of vacuum at idle. Was the car in drive or in park when checked ? I always adjust the carb, idle mixture vacuum etc. in drive. Being in park raises the rpm and vacuum readings. Just checking because if overlooked it will not be an optimized setting of the carb. Good luck.

Re: street/strip engine question
 

idle fuel bleeds? theres idle air jets that ive gone up #75 tp 78...yes slick5681 did vacume check proceedures in drive...

Re: street/strip engine question
 

found them...checking sizes

Re: street/strip engine question
 

thankyou everyone for all you help. best i can measure today is .090'' on the idle feed restrictor....this restrictor i was unaware of, therefore its factory size and untouched.

Re: street/strip engine question
 

Send me your email addy your looking at the wrong restrictions if there .090.