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#1
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Right turn on launch
Just got the car to the track Friday night for test and tune after 3 years of building. Rear end is solid brim joints on all 8 mounting locations. Rear lower bars are straight and not angled anymore. Top bars are still triangulated.
Spool. 2.5 degrees on pinion angle. Guessing 500 hp. Torque converter stalls close to 4,000. Car drives straight down track under power but not launch. Car took a hard turn on the launch straight to wall. Had plenty of time to let off and turn but there’s an issue somewhere. Body roll is extreme right now but we have limited room for an anti roll bar and can’t mount a factory style sway bar since our lowers aren’t stock location I’m thinking about getting a set of trick springs and possibly an air bag for passenger side. Any other recommendations? |
#2
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Air Bag on the right side should help A LOT.
That launch is nasty. Air Lift Bag in right spring location will keep the right side of the car from body acting like a Submarine on the right side. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#3
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Are your slicks directional ? Maybe swap them side to side ? See if the car goes the other direction ?
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3 Generations of "Beach Boys Racing" ! Everybody knows somthin. Nobody knows everything ! 1st time on a dragstrip, 1964. Flagstart ! "Thanks for the entertainment." "Real Indians Don't Wear Bowties" |
#4
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One pass or every pass?
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466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2 373 gears 3200 Continental Convertor best et 10.679/127.5/1.533 60ft 308 gears best et 10.76/125.64/1.5471 |
#5
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An air bag will help in the right rear. It still will lean the harder you launch. The best fix is a good anti rollbar. They make nice weld in ones with rod links to the rear end. In my opinion that is the only way to get a level launch.
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#6
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Yeah, an air bag on right rear could help alot. I used one for years on my car when it started doing that once I got into the low 12's , high 11's. Went to a hr parts bolt on anti roll bar a few years ago. Works good. Also check that slicks are same circumference if you are on slicks.
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#7
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Sometimes you can weld in a piece of tubing between the 4 link brackets or LCA brackets and use that to mount the bar low and run the links up to a cross tube on the chassis up high. I can tell you from race car and street car experience, the ARB is wonderful thing whether your going 9.20s or 11.20s
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1972 Pontiac LeMans Thanks to Fuelab Digital Fuel Delivery Quarter-Max Chassis and Racing Components Last edited by adam woodmancy; 08-29-2022 at 11:46 AM. |
#8
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I take it you've scaled the car already and have equal weight on both rear tires? Anti roll bar would help whichever way, either on the frame or rear end.
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Illinois Outlaw Gassers 6.27@107 9.97@131 |
#9
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Quote:
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1972 Pontiac LeMans Thanks to Fuelab Digital Fuel Delivery Quarter-Max Chassis and Racing Components |
#10
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It was 37 lbs heavy on driver side with me i the car
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#11
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I like it! After welding in a cross bar up and slightly behind the rear end for the shocks there just isn’t much room at all with the stock trunk floor. This looks like it would fit. What brand is your anti roll bar in these pictures?
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#12
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It is a Quarter-Max kit, the only thing I did differently is the cross tube for mounting and instead of using the bolt together tabs on the bearing housing we just took some tubing and fit it to the cups. They have a few different designs, this one was overkill but I liked the billet arms, and being able to remove the bar and the bearings to service it instead having the weld on arms style. I was just going to radius the mounting tabs in the kit to fit the cross tube but but my buddy who welded it up for me liked using the two pieces of tubing instead because he could space it where he wanted it
https://quartermax.com/heavy-duty-1-...kit-universal/
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1972 Pontiac LeMans Thanks to Fuelab Digital Fuel Delivery Quarter-Max Chassis and Racing Components Last edited by adam woodmancy; 08-30-2022 at 08:47 AM. |
#13
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Does your car look like this from the front..lol
That's a local guy Wayne Greens old car from 2001.. |
#14
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This was my old race car before and after we put the RJ-301195 ARB on it. The ARB install was the only change
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1972 Pontiac LeMans Thanks to Fuelab Digital Fuel Delivery Quarter-Max Chassis and Racing Components |
#15
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Back in 72 I helped a friend with a 454 70 Chevelle. He put bags in both springs. Inflated right rear the most. Car just sitting the right side was higher than left(drivers side). Just saying. He had an long asphalt driveway in Latrobe, that I witnessed numerous test hits! They worked.
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#16
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Anti roll and you’re finished
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1965 TriPower GTO, 1967 GTO, 1969 GTO, 1969 Judge, 1972 GTO, 1977 Smokey and the Bandit, 1989 TA ProStreet, 1968 Firebird NHRA 10.90 racecar, 1963 Tempest S/Gas |
#17
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with no roll bay you need lots of pre-load on r/r what are your corner weights -- front and rear
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#18
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Can I put preload on a triangulated 4 link with upper passenger bar? Or does that just work for parallel 4 links.
Installed an air bag and put 12 lbs in it. The squat isn’t quite as bad but still goes right. Car had a 1.58 60ft |
#19
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This was when the car was almost finished so weights might be not exactly the same now but close. Me in it
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#20
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