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Frt End lift on Launch...need Help

Mike Gaines

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Ahwahnee, (Fresno) California
I have installed Cal Tracs with the mono leafs, Cal Trac 9 Way Adj RR shocks and Cal Trac 90/10 front shocks. I have ratcheted the torsion bars way down (loosened them up so the front, in effect, sags more).
I am in the process of building my new 512 stroker and when the motor is done I want to make sure I get the most front end lift on launch (lift) that I can,
Cal Trac tech says you need a minimum of 5" lift, preferably 6", to make the cal tracs work.

Any thoughts. Thanks
 
Watch the Cal Trac's front Shocks were a little too short so they will run out of extension. I ended up putting our old worn out Comp Eng. shock back on.

As far as front end lift they say 5" but make sure you don't lower the car too much... if the front is too low then it can't over come the fulcrum and won't transfer the weight.
 
We run the stock front end travel on both cars,1.40/60 & 1.29/60. One is Caltrack/radial and one is ladder bar/slick. The problem I see most often is the front shocks are so loose that the suspension tops out instantly (or close to it) causing the rear tires to unload. With proper shock adjustment you should not have an issue.
Doug
 
All people to be worried about front end lift and it had to be you !! just alter the wheel base and get on with it !!!! :)
 
Or take some more weight from the front and move it to the back. Instant weight transfer.
 
ozymaxwedge...is this the front end lift you were talking about....lol... well that was about 50 years ago when I was just a kid...traction no problem back then..
1) 15" rear altered wheel base
2) front tube axle moved 10" forward
3) Engine set back 26"
Drive shaft was 10" long...lol
Mike
 

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Mike this vid might give you an idea on how much my car moves up front. Mine is all stock suspension up front including the stock 383 torsion bars. The only change up front is the comp 90/10 front shocks. In the rear is just 3400 lb SS springs and the longer extending MP shocks. No pinion snubber. I basically left most of the suspension all stock and figured if I have problems I will work from there. But the car hooks ok and has pulled a 1.50 best 60 ft running 10.70's at just over 3700 lbs. It might give you an idea of how much a B-body moves up front with very stock suspension. I always figured I would work the suspension more if needed but I am pleased with how it hooks for what it is. I would video your car when you race it so you can watch the car and see how it works. Good luck , Ron

https://www.youtube.com/watch?v=oiUxLqyFZcY&feature=youtu.be
 
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Mike i have 5 or 5 1/2 " front travel. I run a 185/80R15 front tyre with QA1 single adjust front shock Rancho rear . I have gone to a Milodon roadrace sump to help ground ckearance . My next change will be to put heim joint radius rods to help free up the front end .
I have stock bump stops and small block t bars , smaller than 383 bars . Maybe if car was race only i would go heim joint upper arms as well .
Tex
 
That is sick...lol

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Mike i have 5 or 5 1/2 " front travel. I run a 185/80R15 front tyre with QA1 single adjust front shock Rancho rear . I have gone to a Milodon roadrace sump to help ground ckearance . My next change will be to put heim joint radius rods to help free up the front end .
I have stock bump stops and small block t bars , smaller than 383 bars . Maybe if car was race only i would go heim joint upper arms as well .
Tex
Tex, Tell me about your motor, trans, etc for your 10.80 ET's. Thanks, Mike
 
Mike,
Nothing too special , i do try for the best 60' i can . Current best of 1.50 , will average 1.53/54 with less rpm but better lights.
Motor is 440 +0.055 . 10.78 comp . Stealth cnc heads , Eddy Vic manifold, Prosystems HP1000 carb . 5000 stall Dynamic vert , 4.10 geared S60 , 275/60R15 radials. Sumped stock tank with Aeromotive pump and reg .. Cam is a custom solid flat tappet , 258@050 , 540 gross lift , 108 seperation 108 inrake centreline , definatelly needs more lift to carry the top end better .
Car was 3660lbs with me , will race at this with a full stock interior .
DA was around 600 or so early afternoon for 10.88 passes went 10.93 with 30" tall radial the 2 passes before

Car would have run 11.00 or 10.99 2 weeks ago inthe track round final but went through on the brakes for the win at11.04 ,DA 1200/1300 , 6.96? At half track , mid 60's% humidity
Car is not legal to run faster than 11.00 nor am i licenced for that
Have to be careful next weekend at the national round , Nitro Championships
Lots of fun

Tex
Ps : car has hooker 1 7/8 comp headers 3" exhaust to diff with aerochambers , have to run mufflers
 
very cool vintage photos mike

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Have you scaled you car yet ?
see what the rear weight bias is ?
you may not need 5+"'s of lift,
depends on how much traction & weight transfer you "actually need"
my old 68 RR 479ci B-Low deck wedge, full roller blah blah blah
it had CalTracs & OE leafs originally, alum. heads,
alum. serpentine pulleys, idler & 6 rib belts,
elec. 37gpm water pump, alum. pump housing, radiator,
2 Be-Cool elec. fans with a custom shroud
1 puller 16" 2950cfm & a 13" 2900cfm pusher just in case
alum. 7071 driveshaft, alum. MP 742 center section blah blah blah, aluminum all over the place,
battery in the trunk, Aeromotive Elec. Pump fuel system, MRE sliders on the rear of the leafs,
stock 383 Torsion bars, Capps tubular uca's & lca's & strutrods,
cheapo rancho drag shocks from Calvert,
fiberglass front & rear bumpers/w-alum. brackets & A12 lift off hood

it worked best lifted maybe about 3-1/2" IIRC, it ran better when it was limited to that level
it would 1.40 60 ft. at good prepped tracks on M/T 315 drag radials, they weren't exactly new,
it ran best of 9.77 @ 135 Sacramento Test & tune 100* summer day,
IIRC DA was in the high 3000's that day
it's 60 ft. high 1.20's 8.58 @ 156 on a 300 shot of N20
better air, better track prep still hot but DA like 2000...
Anyway it weighed 3520#'s, but had relatively a good rear weight bias
sorry I can remember the actual front to rear bias,
{like 52-53% front {1830-1865#'s} to 48-47% rear {1689-1654#'s} IIRC, don't quote me going on memory}
It ran well with a reworked 4200 stall, 1-1/2 turns of preload on the bars,
sometimes a bit more on the pass. side...
IMO it's all about what your specific combo likes

I would use a 70#-100# rear ballast bolted in the farthest point back in the trunk,
in certain areas/streets or tracks I would run, if I needed more weight transfer,
shocks were a big change latter, double adjustable reworked Lambs,
then later had to be really set stiff or the front would drop too fast & just spin...

It morphed to have different parts over the years, shock changes, spring changes,
tires etc., but that's where that specific car liked to be ran...

Tried to keep as much air out of the front of the car as possible,
forced ram/air on the scoop, sealed to the hood, a few free HP,
a {67 Camaro} spoiler on the front to keep air out from under it too
less wind drag/resistance & routed the air thru the rad
or away from the bottom of the car,
you'd be surprised how much lift & parachute effect having stuff opened up,
not sealed off, will have on the way the car drives/handles
& ET's slightly better too, makes it slightly better than a brick in aerodynamics

what works for one guys car may not be the right combo/set-up for yours
just a guideline not gospel...

I was really use to Ladders & 4 link coil-overs on my real racecars...
it was a little bit of a trail & error with the CalTracs,
I'm probably going to use them on my current 68 RR too,
if I don't go with a Strange S-60 Dana & ridetech 4 link for the street...

I'm a big proponent of make the car work forward not upwards,
if you can, don't waste all that energy going up, instead of out "forward"
of the staging beams...

I tested allot...

good luck & happy Moparing
 
Budnicks...thanks for the response and info. You can be sure I take in every suggestion that comes my way.
When my new 512" is delivered by my engine builder I will try out my current "new" suspension setup which is as follows:
1) Cal Trac Mono Leafs
2) Cal Trac Bars
3) Cal Trac RR 9 way Shock set on 6
4) Cal Trac 90/10 front shocks
5) M/T Dot 28x13.50x15 Rear Slicks on 15x10 Weld Wheels, screwed, set at 13lbs (Narrowed Rear End)
6) Moroso 760x15 Drag Special front tires, 29.2 inches tall
7) Torsion bars unscrewed several turns to get some "sag" for my needed 5" front end lift (as per Cal-Trac Techs)
8) Foot brake launch at 2500RPM
9) Brand new Ultimate Converter (North Carolina) from Lenny set perfectly to my Torque Curves...probably be around 5000 stall.

Shooting for at least 10.70's and 1.50's. It should go faster. We will see. Be about 3 weeks before motor is done.
 
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