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#1
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Reducing Bounce - second wheelie - When Coming Down from Wheelstand
Hey Guys - request help with Reducing Bounce - second wheelie - When Coming Down from Wheelstand with 72 GTO.
https://youtu.be/-wb5zU-Rdh8 Car launches straight, carries the wheels. New best with a 6.41 at 105.5 and later spun at 106. Still launching at 3,500 - 2-step with 5,000 still to grab. Turbo 400 4.11 Pro gears with MT 10.5w x 28 slicks Front suspension: Strange Engineering Rebound adjustable front drag shocks Adjusted to 90/10 settings Landrum 5 x 18 #180 springs and sits close to lower control arm bumps Low friction control arm bushings and ball joints Total Race Weight 3440 Front weight 1860 Rear weight 1580 Percentage Basis Front to rear 55% to 45% Rear suspension: Full length Competition engineering adjustable ladder bars Bottom hole lowest front heim end setting Right bar - slight preload “5 x 13 #150 lbs - springs with spring jacks Comp Engineering double adjustable Rears Bump at 6 tight and rebound at 3 tight Pinion angle 2 degrees negative MT 10.5w x 28 slicks with tubes at 14 pds cold - best runs Thanks Guys, Craig |
#2
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Talking strictly about reducing bounce, wouldn't shocks closer to 50/50 be needed?
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Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons? ... or has built a record breaking DOHC hemi four cylinder Pontiac? ... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967) ... or has a Pontiac born the same year as Jim Wangers? (1926} |
#3
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Agree you have our grown you’r shocks look into Viking or strange double adjustable and then you can stiffen the compression so
It won’t bounce and unload the car once it lands
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1969 carousel red firebird 455, richmond 5 speed 1964 540 gto 1971 lemans sport convertible 1972 Maverick under slow construction |
#4
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The strange single front I have Have a set bump of a 90/10 - so will the strange doubles be stiffer?
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#5
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Afco off the shelf bnc valving shocks will fix the problem. Me personally, I would stay away from the qa-1/strange single adjustable. The valving in those are too inconsistent.
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#6
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Afco off the shelf bnc valving shocks will fix the problem. Me personally, I would stay away from the qa-1/strange single adjustable. The valving in those are too inconsistent.
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#7
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Does the rear seem to hit the tire too hard?
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#8
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I run Viking. They helped out a lot with that.
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A new best of 9.135 @ 145.41 71 Lemans Sport. 72 Lemans Sport. |
#9
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Slow the rebound a click or two in back, tighten the comp on the front if u can, if u cant, get some good DA shocks and don't look back, I agree
with john some afco bnc would work!
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Darby 74 Grandville 2Dr 455 c.i 4550# 2011 1.60 60 ft,7.33@94.55-11.502@117.74 2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32 M/T 275/60 ET SS Drag Radial 2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's |
#10
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Slow the rebound a click or two in back, tighten the comp on the front if u can, if u cant, get some good DA shocks and don't look back, I agree
with john some afco bnc would work!
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Darby 74 Grandville 2Dr 455 c.i 4550# 2011 1.60 60 ft,7.33@94.55-11.502@117.74 2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32 M/T 275/60 ET SS Drag Radial 2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's |
#11
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AFCO BNC shocks for sure and you need to address your bump steer also. Global west makes a nice steering arm that virtually eliminates it. https://www.summitracing.com/parts/gls-ss-6472gskb
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1964 GTO 501, Edelbrock Heads NA, 3460 lbs. 9.76 @ 137mph 1971 Trans Am Lucy Blue, 11.56 @ 115 1966 LeMans. 462, SD prepped Kaufman D ports. 11.90 @ 112 1976 Trans Am twin turbo 462, SD Edelbrock heads 8.50@159 2009 G8 GT |
#12
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Actually - I changed the steering arms with the global west arms.
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#13
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X3 AFCO BNC shocks. Most all the Super Stock racers and bigger wheelstanding bracket cars I have seen run them.
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#14
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I've been really pleased with my Viking Crusader hybrid coilover setup. I worked with Mike Proulx at Viking to pick out spring rate and shock valving. I was skeptical of the 350 lb springs he recommended, but he nailed it! Previously, I had Moroso trick springs and Calvert 90/10's. Street manners are much better. No bouncing and the car settles down to normal ride height about 200 ft down the track. Also, they are about 19 lbs lighter (11.5 lbs compared to 30.5) than the Moroso/Calvert setup.
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Greg Weigart IAIIA 520/pump gas/SD 325 E-heads/266-272 SR cam/1050 Dominator/3.73/ET Street Radial Pro/3300lbs/1.35 60'/6.21@110.47/9.77@137.08 Hot Rod Drag Week finishing averages: 2014 - 11.12 @ 118.56 2015 - 10.84 @ 124.97 2016 - 10.56 @ 127.88 2017 - 10.29 @ 130.74 2018 - 10.29 @ 130.53 2019 - 10.16 @ 132.34 2021 - 10.09 @ 132.69 2022 - 10.13 @ 133.07 |
#15
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I tried the Afco BNC shocks and they were very stiff on the compression. Made the car bounce worse than the shocks I had on it. Get the Afco double adjustable shocks.
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Come take a ride http://www.youtube.com/watch?v=P7Y8Awfk2I0 2008, 2013, 2015, 2016, 2019 Central Il Dragway Mod track champion and 2015 IHRA Div 5 Mod champion |
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