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Author
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Topic: Tuning Questions
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Fastymz
Moderator Posts: 18703
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 04-09-2003 03:18 PM
   
My timing is at 12@750rpm at idle,and 22@2000rpm, 24@ 2500rpm, 30@3000rpm.
I think I need more timing in faster.The starts to pull good abouve 3000 rpm.The carb has a slite hesitation with the lightest spring in the vacuum secondary.I went to two steps up on the spring and the car didn't seem to have enough go.I put the spring just one up from the litest.Now the car pulls good from a stop,but still at 2000-3000rpm if you hit it a slight hesitation to it. What would you guys do now.The pulls strong out of the hole,but not as strong as it beofre new cam.Thats leaving from idle BTW.
But the car pulls alot better above 3000rpm. 600VS HOLLEY 6.5PV ------------------
SCOOP
oddly obsessed with big scoops on little Mustangs 2.26 60'S
14.9 @ 90.86MPH 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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SundanceKid
Gearhead Posts: 1260
From: UT
Registered: Feb 2001
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posted 04-09-2003 04:29 PM
Kinda what going to a bigger cam does.
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69 Sportsroof
Gearhead Posts: 1896
From: Valley, Alabama, USA
Registered: Mar 2002
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posted 04-09-2003 04:42 PM
The timing sounds about right to me.It could be the accelerator pump cam that's causing the bog when you nail it at 2000 rpm. What carb are you using? What's causing you to lose the off idle performance could be your intake if you're using an RPM. It's designed to kick in at 1500-6500 whereas a Performer is for idle-5500 which is the rpm range for the cam you installed.
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Glens67
Gearhead Posts: 477
From: Petaluma
Registered: Mar 2002
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posted 04-09-2003 04:54 PM
Ron
Is that timing with the Vacuum hooked up?
Do you want a factory dual point mechanical adv. distributor? UH I forgot, what motor you are running? This distributor is for a 302/289------------------
Glen
67 GT 390
65 Galaxie 500 XL 4 Speed
It was not a Red Light they gave me a Slow Tree
I WAS NOT LATE the Tree was Fast
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Moneymaker
Administrator Posts: 25883
From: Lyons, IL, USA
Registered: May 99
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posted 04-09-2003 05:32 PM
Try 2 more degrees of timing and two sizes larger discharge nozzle.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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Fastymz
Moderator Posts: 18703
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 04-10-2003 12:49 AM
I'm using a #31 squirter now.Do you still think I should go up two sizes?Do you think that the K&N stub stack is affecting anything? On the timing does the curv sound good,and yes that was with the Vacuum advance plugged. I t does run more cool then before and does not get real hot on the freeway any more.It still goes up about 5 degrees on the freeway.But it was going up 10-15 degrees on the freeway. It does seem to have alittle bit of a choppy idle.The tach will bouce no more then 100rpm.Is this a carb or ignition problem or is it the cam? ------------------
SCOOP
oddly obsessed with big scoops on little Mustangs 2.26 60'S
14.9 @ 90.86MPH 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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Moneymaker
Administrator Posts: 25883
From: Lyons, IL, USA
Registered: May 99
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posted 04-10-2003 12:52 AM
Do what I said.  ------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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Fastymz
Moderator Posts: 18703
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 04-10-2003 12:59 AM
quote:
Originally posted by Moneymaker:
Do what I said.
Always do,and it's always worked. 
I was not questioning you,just giving you all the facts. 
------------------
SCOOP
oddly obsessed with big scoops on little Mustangs 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
IP: Logged |
bluestreek
Gearhead Posts: 1724
From: Athens,GA
Registered: Jul 2001
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posted 04-10-2003 01:13 AM
Yeah, do what Alex D. says!
You need more low rpm advance if it can handle it without spark knocking. MORE low rpm spark ADVANCE means more POWER and better carb response. You should have 34 deg in by 3000 for good power on the street. I'm using 18 deg. initial and 34 total on my 331 when running 89 oct. If I run 93 octane I can go up to 20 and 36 deg.------------------
1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank and girdle, 5.4 H-beams, Forged slugs, TFS alum. heads, ported Stealth 8020 intake, Xtreme 274 Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
2nd pass: 12.11 @ 114 mph
DanH
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steve'66
Gearhead Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 04-10-2003 01:29 AM
Even better than that is to lock it out at 34 degrees all the time. If you have a stall around 3000+ SteveW
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Fastymz
Moderator Posts: 18703
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 04-10-2003 01:34 AM
Steve not there yet.
Dan I've never had any knock.So next week I'll do what Alex said,and advance the timing 2 degrees at a time.------------------
SCOOP
oddly obsessed with big scoops on little Mustangs 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
IP: Logged |
stang106
Gearhead Posts: 780
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
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posted 04-10-2003 02:21 AM
Ron,
I tuned my Holley's seconday to open with the lightest spring it could handle without bogging. Then I added a 'StubStack' and the increased signal pulled the secondaries open too soon. I went to a heavier spring and the problem was solved, plus now have more bottom-end. Does this sound familiar to your application?
Dave------------------
'70 ragtop Stang
351W - 13.70 @104.
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Fastymz
Moderator Posts: 18703
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 04-10-2003 12:46 PM
It does Dave,but I tried the next to springs up and they both did the same thing?
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SCOOP
oddly obsessed with big scoops on little Mustangs 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
IP: Logged |
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