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Author
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Topic: sugging at speed
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roger
Gearhead Posts: 533
From: ontario, canada
Registered: Aug 2000
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posted 11-11-2006 01:57 PM
 
New holley Str. avenger 670, runs really well except at cruise when the car feels like it backs off, surges, like your on & off the gas slightly
any ideas?
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mustangboy
Gearhead Posts: 1343
From: Ont, Canada
Registered: Mar 2002
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posted 11-11-2006 05:18 PM
I think surges are usually caused by lean conditions..How do the plug look?------------------
68 J-Code,Sprint,306 4 speed,4.11s 13.69@101...............
66 coupe 289 4 speed, 3.20 cruiser http://mustangsandmore.50megs.com/MembersPics/mustangboy.html http://mustangsandmore.50megs.com/MembersPics/mustangboy2.html
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Moneymaker
Administrator Posts: 29200
From: Lyons, IL, USA
Registered: May 99
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posted 11-11-2006 05:22 PM
Power valve may be too tall for part throttle cruise conditions.
A shorter one will probably cure the problem.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/SRA member and licensed Superstock driver
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,'04 &'05
First NHRA & IHRA 289 automatic Superstock Mustang in the TENS 06-99
First SS/MA in the TENS 04-03
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 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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capri man
Gearhead Posts: 8777
From: doerun, ga.
Registered: Nov 2000
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posted 11-11-2006 07:31 PM
all mine are the same height alex!!   ------------------
mike r
racing is real
everything else is just a game.
81 capri-302-7.25 @93mph 1/8
1.54 60ft 50 % of the fun dragracing is meeting people who will give you the shirt off their back to wipe the grease off your hands.
M&M member #839 http://i2.photobucket.com/albums/y6/mike470/adel2.jpg
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Moneymaker
Administrator Posts: 29200
From: Lyons, IL, USA
Registered: May 99
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posted 11-11-2006 10:25 PM
quote:
Originally posted by capri man:
all mine are the same height alex!!
Yeah, but yours are still short Mike.
At least that's what Johnnie says. 
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Alex Denysenko
Co-Administrator and Moderator NHRA/SRA member and licensed Superstock driver
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,'04 &'05
First NHRA & IHRA 289 automatic Superstock Mustang in the TENS 06-99
First SS/MA in the TENS 04-03
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 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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cookie_monster
Journeyman Posts: 70
From: south, central, us
Registered: Nov 2005
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posted 11-12-2006 10:25 PM
Sounds lean at cruise. Try playing with the timing a little. I found (on my old Mustang) that retarding the timing a little at cruise only (adjustable vacuum advance) while not messing with the total or initial advance...I was able to get rid of most of the surge, yet still get good fuel economy.Just a thought, FWIW.
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roger
Gearhead Posts: 533
From: ontario, canada
Registered: Aug 2000
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posted 11-18-2006 05:23 PM
Lean condition was apparant ever so, 2 sizes up,seemed to do the trick.
actually i took the bigger jets from the secondaries & switched with the 2 sizes smaller in the primaries
Worked for about a week, now its back!
nothing to really get excited about, but, i wil pour gas in my interior & set fire to her if she doesn;t stop doing this immediately
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Fastymz
Moderator Posts: 22791
From: Reno Nv M&M #1240
Registered: Apr 2001
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posted 11-18-2006 07:14 PM
quote:
Originally posted by roger:
Worked for about a week, now its back!
nothing to really get excited about, but, i wil pour gas in my interior & set fire to her if she doesn;t stop doing this immediately
LOL I know what you mean!
Try a different power valve like Alex said. It worked for me, I had the same problem.
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oddly obsessed with big scoops on little Mustangs HOOD HACKERS DELIGHT!
My Pics 13.563 @ 108.64
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roger
Gearhead Posts: 533
From: ontario, canada
Registered: Aug 2000
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posted 11-19-2006 05:24 PM
I wil give her one more chance & switch power valve & thank you
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