street/strip engine question

richie 2 · 12-16-2020, 07:54 AM

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.

Glenn Briglio · 12-16-2020, 07:58 AM

Quote:

Originally Posted by richie 2

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

Put an O2 sensor and data logger in it.

richie 2 · 12-16-2020, 08:01 AM

tks glen, who makes that system?

jmcarter · 12-16-2020, 09:08 AM

Call him, you won’t be sorry...

http://www.motorsportsinnovations.com/

Mark Ruset · 12-16-2020, 11:08 AM

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

Dave Noll · 12-16-2020, 06:23 PM

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

monte385 · 12-19-2020, 05:29 PM

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,

richie 2 · 12-19-2020, 06:13 PM

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

Bob F · 12-20-2020, 10:58 AM

What have you tried?

L.Fite · 12-20-2020, 11:30 AM

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

12-16-2020, 07:54 AM	#1
richie 2 Senior Member Join Date: Feb 2009 Posts: 934 Likes: 358 Liked 167 Times in 77 Posts	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. Last edited by richie 2; 12-16-2020 at 08:04 AM.

12-16-2020, 08:01 AM	#3
richie 2 Senior Member Join Date: Feb 2009 Posts: 934 Likes: 358 Liked 167 Times in 77 Posts	Re: street/strip engine question tks glen, who makes that system?

12-16-2020, 09:08 AM	#4
jmcarter VIP Member Join Date: Dec 2008 Location: Richmond Hill GA (and Port Ludlow WA) Posts: 4,202 Likes: 2,150 Liked 2,932 Times in 901 Posts	Re: street/strip engine question Call him, you won’t be sorry... http://www.motorsportsinnovations.com/ __________________ Jim Carter 2340 Super Stock 2340 SST/2340 Stock Set another place at the table

12-16-2020, 11:08 AM	#5
Mark Ruset Member Join Date: May 2006 Location: Southwest Florida Posts: 251 Likes: 25 Liked 35 Times in 25 Posts	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 __________________ Mark Ruset 2048 STK

12-16-2020, 06:23 PM	#6
Dave Noll Senior Member Join Date: Nov 2007 Location: Div. 6, Eastern, WA Posts: 699 Likes: 2,445 Liked 224 Times in 106 Posts	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. __________________ Dave Noll, E/FS ,?/SA 6526

12-19-2020, 05:29 PM	#7
monte385 Junior Member Join Date: Oct 2015 Posts: 57 Likes: 38 Liked 23 Times in 19 Posts	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,

12-19-2020, 06:13 PM	#8
richie 2 Senior Member Join Date: Feb 2009 Posts: 934 Likes: 358 Liked 167 Times in 77 Posts	Re: street/strip engine question @ idle is the issue. way rich. have been all through the tuning to no avail.

12-20-2020, 10:58 AM	#9
Bob F Junior Member Join Date: Sep 2007 Location: Bucks Co Pa Posts: 59 Likes: 16 Liked 14 Times in 10 Posts	Re: street/strip engine question What have you tried?

12-20-2020, 11:30 AM	#10
L.Fite Member Join Date: May 2020 Posts: 427 Likes: 427 Liked 389 Times in 196 Posts	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.