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Author Topic:   Holley Carb Tuning advice
Fastymz
Moderator

Posts: 21275
From: Reno Nv USA M&M#1240
Registered: Apr 2001

posted 09-25-2002 06:44 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
The carb I put on runs good and smooth.Seems alittle weaker then the carter I took off.I have no bog at all now anywhere in the rpm range.
I changed the Vac,2ndary spring to the yellow one,from the purple one.I cant notice any difference.SHould I keep going liter on the spring until it bogs.
I got a stub stack for it,I cant say i see any improvement at all.I'm going to try and get it to the drags on the 5th.I'll run it both with and without the stub stack.That will tell me more.
My car dose run more smooth,but seems to have less power then before.Less wheel spin with new carb.But it seems to pull harder in the 3000-5000+ rpms range.
Any advice or tips,I'm kinda lost now on the carbfor now.Being new to holleys I'm not sure what will make it pull better from 1000-5000+.

SCOOP

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2.634 60's
[email protected] 1/8 mile

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

[This message has been edited by Fastymz (edited 09-26-2002).]

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SteveLaRiviere
Administrator

Posts: 45869
From: Saco, Maine
Registered: May 99

posted 09-25-2002 08:18 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
How do the plugs look?

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'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

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clevelandstyle
Gearhead

Posts: 1309
From: central Indiana
Registered: Jul 2001

posted 09-25-2002 09:20 PM     Click Here to See the Profile for clevelandstyle     Edit/Delete Message   Reply w/Quote
Don't worry if it doesn't feel as quick. Sometimes smooth is quicker even if it doesn't feel like it. Some of the changes you are doing are things that you can't really tell if it improved unless you take it to the track. Seat of the pants doesn't mean much. ETs tell the story.

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Ben
Grabber Green '70 Mach I 351C 4V
Robbin Egg Blue '79 Fairmont 351C 4V

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capri man
Gearhead

Posts: 7611
From: doerun, ga.
Registered: Nov 2000

posted 09-25-2002 10:23 PM     Click Here to See the Profile for capri man   Click Here to Email capri man     Edit/Delete Message   Reply w/Quote
did you re-tune the SCOOP after the carb change?????????

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mike r
racing is real
everything else is just a game.
81 capri-7.51 @89mph 1/8
1.54 60 ft.
http://prestage.com/site/site_display.asp?SiteID=141

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Fastymz
Moderator

Posts: 21275
From: Reno Nv USA M&M#1240
Registered: Apr 2001

posted 09-25-2002 10:38 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by capri man:
did you re-tune the SCOOP after the carb change?????????


Well I kinda did,I had to get a new base for my air cleaner so my air filter still sat in the place on my scoop.

Steve I'll go look at some of the plugs tonight.And let you know.

Ben your right,the car seems so much more smooth it's like a diffenrent car.Between shifts it loses less rpm.And it rev's faster now too.At least it seems to.

SCOOP

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2.634 60's
[email protected] 1/8 mile

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

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Fastymz
Moderator

Posts: 21275
From: Reno Nv USA M&M#1240
Registered: Apr 2001

posted 09-25-2002 11:33 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
I went out and check most of the spark plugs.I got to 6 of them #1,3-4-5-7-8.They all were dark brown kinda like chocolate color on the electrods and the porcelian.The first two treads all had black soot.The number 7 plug was real dark,and had little chucks of hard deposits around the top of the treads.They would break up but seemed real gritty.

They have never been that dark brown before.The soot was there before.

SCOOP

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2.634 60's
[email protected] 1/8 mile

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

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steve'66
Gearhead

Posts: 9533
From: Sonoma,CA,USA
Registered: Mar 2000

posted 09-26-2002 12:58 AM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Ron,

Try 2-4 jet sizes smaller and an even lighter spring. Get it to bog then use the next heaviest spring in the kit. Your secondaries aren't coming in 'til the upper rpms! Gotta get them to open sooner.

SteveW

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Fastymz
Moderator

Posts: 21275
From: Reno Nv USA M&M#1240
Registered: Apr 2001

posted 09-26-2002 12:31 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by steve'66:
Ron,

Try 2-4 jet sizes smaller and an even lighter spring. Get it to bog then use the next heaviest spring in the kit. Your secondaries aren't coming in 'til the upper rpms! Gotta get them to open sooner.

SteveW


Wow 2-4 smaller jets I only have 63 pri,and the meter plate is a 73.Should I change both the meter,plate and the pri,jets or just the pri jets? I'll take your advice Steve I'll do the jets,just let me know on the meter plate,if it needs to come down too.
And I have to go get a lighter spring the yellow was the lightest one I had.

SCOOP

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2.634 60's
[email protected] 1/8 mile

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

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Fastymz
Moderator

Posts: 21275
From: Reno Nv USA M&M#1240
Registered: Apr 2001

posted 09-29-2002 02:04 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
Steve I got the secondarys to open with the screw in the linkage.The car was in park,I only got the secondarys to open half way.I didn't want to over rev the motor.

SCOOP

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2.634 60's
[email protected] 1/8 mile

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

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