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  1. #26
    Join Date
    Nov 2004
    Location
    Alberta Canada
    Posts
    374

    Default Re: Q850 idle tuning help needed

    I just put a Q series quick fuel 750 mechanical double pumper on my 78 383 vette & have noticed the stinky exhaust at idle too,the car has a fairly radical cam in it(10hg idle vacuum).I also have had a hell of a time trying to clean up the idle,very very frustrating.
    After closing in the secondary air/fuel screws to about 1/2 turn out it helped a bit but at idle still smells,it runs well throughout the rpm range thank goodness
    My next step is the air bleeds,only 100.00 at the local speed shop.

    Thanks for posting
    1970 GSX replica
    455,11:1 forged pistons,Carillo Alum H-beam rods,T/A 510 cam,SP Intake,Holley HP 950 carb,ported T/A Street Eliminator heads,roller rockers,Mickey Thompson super scavenger headers
    upgraded turbo 400 with 10'' 3500 stall
    12 bolt rear,Moser axles,c-clip eliminator kit,Eaton posi 3:73 gears,HR parts n stuff rear end kit
    Tubular upper & lower A-arms,trans-am front sway bar,adjustable shocks at all 4 corners
    11.81@114 so far

  2. #27
    Join Date
    Dec 2012
    Location
    Morrisville PA
    Posts
    530

    Default Re: Q850 idle tuning help needed

    Anybody think I can get into the very high 12's?
    Went to E-Town last night, my best ET so far. Noisey valvetrain and all.

    At WOT the a/f meter was 12.5 in second and went down to 12.1-2 in third gear.
    Shifting at 1-2 at 5200 and 2-3 at 5400 rpm which is a few hundred less then before the trans and converter change.


    Tony
    Attached Images Attached Images
    Last edited by deluxe68; 08-05-2016 at 05:44 AM.
    Tony M.
    430 engine .030 over / Stock crank was ground & balanced
    Stage 1 valves, bowl blended / HD shafts & steel rockers
    TA-310 cam / TA SP-1 / Quick Fuel Q-850
    Mallory Comp SS Breakerless Dist. / 29440 Coil / Hyfire 6al box
    MSD 8.5mm wires / NGK UR-5 .045 gap
    TA Shorty Headers / Flowmaster 2.5 dual exhaust & super 44's
    Ron Davis radiator
    TH350 / Sprag drum upgrade / B&M shift kit / TSP 9.5 converter
    JD Race 10 bolt 8.5 Eaton Detroit TrueTrac posi / 3.42 gears



  3. #28
    Join Date
    May 2013
    Posts
    3,670

    Default Re: Q850 idle tuning help needed

    12.80s with a 1.68 to 1.72 60' mph is there for high 12's yes
    70 stage 1 Back under construction
    540 Tomahawk, F1c-94 Procharger
    Holley HP EFI, Stage 2 TE's
    Shooting for 1khp at the tire and 5.50s

    .

  4. #29
    Join Date
    Dec 2012
    Location
    Morrisville PA
    Posts
    530

    Default Re: Q850 idle tuning help needed

    Quote Originally Posted by hugger View Post
    12.80s with a 1.68 to 1.72 60' mph is there for high 12's yes
    I'd be super happy with that result with this motor. We shall see if I can get there.
    Running 80 jets with low 12's on the a/f at WOT is acceptable? Not to rich?

    Tony
    Tony M.
    430 engine .030 over / Stock crank was ground & balanced
    Stage 1 valves, bowl blended / HD shafts & steel rockers
    TA-310 cam / TA SP-1 / Quick Fuel Q-850
    Mallory Comp SS Breakerless Dist. / 29440 Coil / Hyfire 6al box
    MSD 8.5mm wires / NGK UR-5 .045 gap
    TA Shorty Headers / Flowmaster 2.5 dual exhaust & super 44's
    Ron Davis radiator
    TH350 / Sprag drum upgrade / B&M shift kit / TSP 9.5 converter
    JD Race 10 bolt 8.5 Eaton Detroit TrueTrac posi / 3.42 gears



  5. #30
    Join Date
    May 2013
    Posts
    3,670

    Default Re: Q850 idle tuning help needed

    I would work on the 60' before loosing sleep over the AF, the gain in leaning it out would be very minimal compared to to the needed 60' improvement, what's the converter flashing too?
    70 stage 1 Back under construction
    540 Tomahawk, F1c-94 Procharger
    Holley HP EFI, Stage 2 TE's
    Shooting for 1khp at the tire and 5.50s

    .

  6. #31
    Join Date
    Dec 2012
    Location
    Morrisville PA
    Posts
    530

    Default Re: Q850 idle tuning help needed

    Quote Originally Posted by hugger View Post
    I would work on the 60' before loosing sleep over the AF, the gain in leaning it out would be very minimal compared to to the needed 60' improvement, what's the converter flashing too?
    Couldn't tell ya. I've heard the terminology, just don't understand it.
    How do you test for that? Is it a sound or feeling?
    I did however leave at 1500 rpm with 30 lbs. of air in the tires.


    Tony
    Tony M.
    430 engine .030 over / Stock crank was ground & balanced
    Stage 1 valves, bowl blended / HD shafts & steel rockers
    TA-310 cam / TA SP-1 / Quick Fuel Q-850
    Mallory Comp SS Breakerless Dist. / 29440 Coil / Hyfire 6al box
    MSD 8.5mm wires / NGK UR-5 .045 gap
    TA Shorty Headers / Flowmaster 2.5 dual exhaust & super 44's
    Ron Davis radiator
    TH350 / Sprag drum upgrade / B&M shift kit / TSP 9.5 converter
    JD Race 10 bolt 8.5 Eaton Detroit TrueTrac posi / 3.42 gears



  7. #32
    Join Date
    Feb 2002
    Location
    Oakland Gardens, N.Y.
    Posts
    27,440

    Default Re: Q850 idle tuning help needed

    Quote Originally Posted by deluxe68 View Post
    Couldn't tell ya. I've heard the terminology, just don't understand it.
    How do you test for that? Is it a sound or feeling?
    I did however leave at 1500 rpm with 30 lbs. of air in the tires.


    Tony
    When you foot brake the car at the line, look at the RPM. As soon as you pop your foot off the brake, launch and mat the gas, the engine RPM will flash to a certain RPM. That is flash stall. Are you using Drag Radials? I would start at 22 psi at the track. Go down from there and watch the 60'.
    Larry
    1998 "Fully Optioned" SC3800 Riviera
    70 GS 455 Stage1, TSP 470, 602 HP@ 5900, 589 TQ @ 4900
    TA Hyd Roller Cam, 230*/238*, 112, .544"/.577" lift, 4-7 swap
    MSD Digital 6+, Ignitionman Distributor w/MSD trigger
    THM400 with Ultimate 258mm converter, Gear Vendors OD
    AED 1000 HO Carb, 800 CFM 7042240 Quadrajet
    8.5 10 bolt, 3.73's Race weight 4025lbs.
    Best E.T. 11.54 Best MPH, 116.06
    Larrymta@verizon.net, GSCA #291
    BPG # 1063
    N.E. GS/GN Club Assistant Director

  8. #33
    Join Date
    Dec 2012
    Location
    Morrisville PA
    Posts
    530

    Default Re: Q850 idle tuning help needed

    Quote Originally Posted by LARRY70GS View Post
    When you foot brake the car at the line, look at the RPM. As soon as you pop your foot off the brake, launch and mat the gas, the engine RPM will flash to a certain RPM. That is flash stall. Are you using Drag Radials? I would start at 22 psi at the track. Go down from there and watch the 60'.
    I'll be testing this on Sunday at E-Town. Running 255/60/15 M//T ET Street Drag Radials.
    Tony M.
    430 engine .030 over / Stock crank was ground & balanced
    Stage 1 valves, bowl blended / HD shafts & steel rockers
    TA-310 cam / TA SP-1 / Quick Fuel Q-850
    Mallory Comp SS Breakerless Dist. / 29440 Coil / Hyfire 6al box
    MSD 8.5mm wires / NGK UR-5 .045 gap
    TA Shorty Headers / Flowmaster 2.5 dual exhaust & super 44's
    Ron Davis radiator
    TH350 / Sprag drum upgrade / B&M shift kit / TSP 9.5 converter
    JD Race 10 bolt 8.5 Eaton Detroit TrueTrac posi / 3.42 gears



  9. #34
    Join Date
    Dec 2012
    Location
    Morrisville PA
    Posts
    530

    Default Re: Q850 idle tuning help needed

    Quote Originally Posted by hugger View Post
    12.80s with a 1.68 to 1.72 60' mph is there for high 12's yes
    Not yet, but getting closer. Best time so far, must have been the Cecil event.
    Maybe the incoming fall air will help a little more because my 60' time are not improving any.
    Attached Images Attached Images
    Tony M.
    430 engine .030 over / Stock crank was ground & balanced
    Stage 1 valves, bowl blended / HD shafts & steel rockers
    TA-310 cam / TA SP-1 / Quick Fuel Q-850
    Mallory Comp SS Breakerless Dist. / 29440 Coil / Hyfire 6al box
    MSD 8.5mm wires / NGK UR-5 .045 gap
    TA Shorty Headers / Flowmaster 2.5 dual exhaust & super 44's
    Ron Davis radiator
    TH350 / Sprag drum upgrade / B&M shift kit / TSP 9.5 converter
    JD Race 10 bolt 8.5 Eaton Detroit TrueTrac posi / 3.42 gears



  10. #35
    Join Date
    Dec 2012
    Location
    Morrisville PA
    Posts
    530

    Default Re: Q850 idle tuning help needed

    Been messing around again trying to lean out the idle circuit a little more.

    Pri jet 73 / Sec jet 80 / PV 6.5 / IAB 72 / HSB 33 / IFR .030 / Squirt 33 F&R / N&S .110

    A/F readings, fully warmed up

    *Cold start up is in the 14.5-14.8 range maybe for 20 sec or so

    Park Idle 11.8 at 700 rpm / In gear Idle 11.3 at about 600+ rpm

    Cruise RPM's
    1000 11.4 / 1200 12.3 / 1500 15.2 / 1800 14.8 -15 / 2000 15.1 / 2200 14.4 / 2500 13.8 / 3000 13.3

    Was 13.5 at the stripe with Sec jet at 79 at the Atco get together couple weeks ago.

    If I increase the air bleed to 73 trying to lean the idle circuit, the mid range rpm's go into the 16's and it really
    does not change the idle A/F worth noting.

    So the main question I have is, when would it be nessassary to drill .125 holes in the throttle plates?
    or should I turn up the primary idle screw to increase the idle rpm?
    I have both idle screws turned .25 turn from t-slot being square for 6-700 rpm (would like a little more)
    Tony M.
    430 engine .030 over / Stock crank was ground & balanced
    Stage 1 valves, bowl blended / HD shafts & steel rockers
    TA-310 cam / TA SP-1 / Quick Fuel Q-850
    Mallory Comp SS Breakerless Dist. / 29440 Coil / Hyfire 6al box
    MSD 8.5mm wires / NGK UR-5 .045 gap
    TA Shorty Headers / Flowmaster 2.5 dual exhaust & super 44's
    Ron Davis radiator
    TH350 / Sprag drum upgrade / B&M shift kit / TSP 9.5 converter
    JD Race 10 bolt 8.5 Eaton Detroit TrueTrac posi / 3.42 gears



  11. #36
    Join Date
    May 2002
    Location
    Linden, MI
    Posts
    4,671

    Default Re: Q850 idle tuning help needed

    first step is smaller idle feed restrictors.
    Doug Gorton
    Gravity, it's only a theory.
    Trying is the first step towards failure
    -Homer Simpson
    GSX clone- May 2002
    Supercharged 462-April 2010
    1973 Ski Nautique 351w
    87 GN- August 2005

  12. #37
    Join Date
    Dec 2012
    Location
    Morrisville PA
    Posts
    530

    Default Re: Q850 idle tuning help needed

    Quote Originally Posted by sailbrd View Post
    first step is smaller idle feed restrictors.
    With the .028 IFR's installed, it won't idle unless I open up both speed screws way past the norm and at that point
    is it not running on the mains instead of the idle circuit?
    This was why I'm thinking it could use more air in the idle circuit.
    Tony M.
    430 engine .030 over / Stock crank was ground & balanced
    Stage 1 valves, bowl blended / HD shafts & steel rockers
    TA-310 cam / TA SP-1 / Quick Fuel Q-850
    Mallory Comp SS Breakerless Dist. / 29440 Coil / Hyfire 6al box
    MSD 8.5mm wires / NGK UR-5 .045 gap
    TA Shorty Headers / Flowmaster 2.5 dual exhaust & super 44's
    Ron Davis radiator
    TH350 / Sprag drum upgrade / B&M shift kit / TSP 9.5 converter
    JD Race 10 bolt 8.5 Eaton Detroit TrueTrac posi / 3.42 gears



  13. #38
    Join Date
    Dec 2012
    Location
    Morrisville PA
    Posts
    530

    Default Re: Q850 idle tuning help needed

    I'm going to drill the holes to see if it helps any. Worst case I buy new blades.
    Going to be looking for a carb that has the IFR's at the bottom if the holes do not work out. I know the QF could be drilled and tapped but I'm not going that route myself. I'll send it out and let QF do it. And if that ends up being the case, I'll get a 750 for street use and swap to the 850 at the track.
    Tony M.
    430 engine .030 over / Stock crank was ground & balanced
    Stage 1 valves, bowl blended / HD shafts & steel rockers
    TA-310 cam / TA SP-1 / Quick Fuel Q-850
    Mallory Comp SS Breakerless Dist. / 29440 Coil / Hyfire 6al box
    MSD 8.5mm wires / NGK UR-5 .045 gap
    TA Shorty Headers / Flowmaster 2.5 dual exhaust & super 44's
    Ron Davis radiator
    TH350 / Sprag drum upgrade / B&M shift kit / TSP 9.5 converter
    JD Race 10 bolt 8.5 Eaton Detroit TrueTrac posi / 3.42 gears



 

 
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