vega launch.....

Old 08-03-2013, 11:12 AM
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mwbrasher
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Default vega launch.....

i have a 74vega... last year we had the car back half... 4 link... 5:13 gears...coil overs...14x32 tires... this year we had the front end re-done... tube frame mustang ll suspension.... coil overs etc..... took the car out last nite for test&tune... pulled l-front tie about 2 feet in the air... r-fr0nt was only about 8" off the gronnd... 60 ft time is 1.53... with all the chassic work done... should'nt both front wheels be the same height off the ground?? any advice would be great... thanks caveman :? :? :?
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Old 08-03-2013, 12:15 PM
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fla1976
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Does it have frame connectors? Does it have a 8 point roll age? Shouldn't be twisting up like that.
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Old 08-03-2013, 01:04 PM
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Here is a photo of my old Vega, it is pretty level. Frame connectors and full cage. It stiffens the frame significantly. It was a low budget car and ran 10.70's. Not the fastest, but I had less than 10k in it.


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Old 08-03-2013, 02:39 PM
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mwbrasher
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Default vega launch

yes... has 8 point cage... motor plate in front and rear...chassis cert to 8.50... thanks for responce... "i am confused" over 8 grand in chassis work!!!!!!!!!!!!
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Old 08-03-2013, 03:16 PM
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fla1976
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Sounds like a similar setup. Ladder bars, Ford 9 inch with 4.88 gears. 11.5 x 30 inch tires (Not enough clearance for bigger tires. Front and rear motor plates. Engine set back to #1 cylinder aligned with front spindle. 60 foot was usually around 1.46
There is way too much flex for what has been done to your car. If you jack up the left front with a jack about a foot, does the right side stay on the ground? It sounds like some serious twisting.
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Old 08-03-2013, 03:17 PM
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TheYellaBrick
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Well don't fret over the monetary amount in your chassis. NOW is the time to be LEARNING how to 'tune' all that adjustability. :-)
Need to spend a day or a few evenings and set the car up to a 'base line' setup. Square the front and rear axle lines, corner to corner/side to side front to rear. Write EVERYthing down in a log book. When at the track, make ONE small adjustment at a time. JUST ONE. write it down, and also note what the change did in how the car felt or reacted. Making any more than ONE adjustment at a time will get you so lost off the base line you'll never get it back, except back in the shop.
We've discussed this very subject a few times here on RJ, so I know we'll be able to head you in the right direction.
Chassis twist under violent launches can be reduced by increased tire pressure on right rear, stiffer shock setting on RR, some 4 link adjustments.
You might shoot us some pics of the cage and rear suspension. Pics ALWAYS help !
A properly built cage will turn the chassis into a 'gerder' type bridge, VERY stiff.
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Old 08-03-2013, 03:42 PM
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markdunlap
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For $8K chassis work, it should have included an anti roll bar in the rear that would eliminate the twist at the launch.
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Old 08-03-2013, 04:31 PM
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mwbrasher
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Default vega launch

thanks for the information... there are so many adjustments... i guess i need to start from square one... i will let you know what i find...thanks again...caveman
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Old 08-04-2013, 05:14 AM
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itsabird
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how about some pic, of your 4-link set up with the slick off.
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Old 08-04-2013, 09:04 AM
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fla1976
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I am trying to find a copy of the chassis information from Ed Vance. He has passed but he gave a lot of info in one of the threads on chassis setup. I will try to locate it again. It was on an older computer that died and I have it saved somewhere. Great information.
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