Author Topic: Anyone in here using composite leaf springs?  (Read 23345 times)

Offline brads70

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Re: Anyone in here using composite leaf springs?
« Reply #60 on: May 13, 2014 - 08:37:53 AM »
had to say brad I'm creeping in on your old posts lol started off with reading articles on drop spindles (since I'm running the MF ones) there's alot of good information in the threads -  made it to the end and saw this post ouch! My race car being a import ,all the spring rates are in kg not lbs, I usually ran a 6kg front, 4kg rear for a daily streetable car, 8kg front 6 kg rear was about the highest I would go on the street as your back felt the vibrations of the road.  But if you wanna convert lbs to kg from what a stock car racer told me was to divide the # in lbs by 56 to get kg. So when he said 620lbs front that is equal to an 11kg!! ouch, no wonder his shocks couldn't dampen that rate!!!

still debating over my choices of torsion bars and leaf springs, I'll have this summer to see how well they do hopefully. the 1.12 bars which I have are rated at 270 lbs or 5kg and the rear at 200 lbs is about 3.5kg which will make a great driver for the street but I can see myself going to bigger rates down the road

Good to see you over here too!
Lots of good people in here also!
Brad
1970 Challenger 451stroker/4L60 auto OD
Barrie,Ontario,Canada
Proud to own one of the best cars ever made!!!!!

My restoration thread 
http://www.cuda-challenger.com/cc/index.php?topic=59072.0
 My handling upgrade post
http://www.cuda-challenger.com/cc/index.php?topic=73985.0




Offline Mopar Mitch

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Re: Anyone in here using composite leaf springs?
« Reply #61 on: May 13, 2014 - 04:24:49 PM »
Dangina -- You can try stepping up the TBs to the FF 1.18, but after you get used to them you'll want to try bigger.  I've done this all in the past so that's why I'm encouraging you to not waste time with the softer TBs.   FF has the 1.24 TBs aside in-stock ($500 a pair?) as they did a recent small production run (I was told by a friend who just spoke with Dick Ross at FF).  the stiffer TBs will prevent excessive front dive/lift and keep the car flatter and much more responsive.  Use the sway bars and bushings to fine-tune the handling;  the doulble-adjustable shocks (QA1, Strange, etc) are the best final touch (Brad's already given us the "reduced height" QA1 part numbers).

My T/A has the the 1.24 TBs, 225/5" fiberglass mono leafs (Flex-A-Form is a great company that worked with me to determine this spec... you ned to know the 4-corners weights of the car with driver as you'd drive/race it mst of the time, especially the rear weights for the leafs), front sway bar is solid 1.24", rear sway bar is solid 1.00", sway bar end link bushings are 50/50 rubber/urethane to my liking, old RED KONI shocks that I've played with the settings and also had them re-valved a little stiffer (fronts set at full-firm, rears at ~2/3 firmness... car handles/races (pylon auto-x and road course) fantastic and is a joy to drive on the highways (currently have 2-sets rims/tires:  "cruising" 15x8 minilites with BFG T/A 255-60-15 fronts (~30 psi), 275-60-15 rear (~28 psi)... and "road course HSAX" 16x8 minilites with BFG Comp-2 G-Force 255-50-16 front/rear (cruising at 30f/28r psi, HSAX racing so far best results at ~44f/42r psi).

I also have 16x10 liteweight forged aluminum racing rims with Hoosier A6 275-45-16 f/r tires (40 TW) for the most serious competition (but they're old/hard... need fresh rubber.. and more $$... the G-Force will do for a while/~2-3 years ahead.
Autocross/road racers go in deeper... and come out harder!

See  MOPAR ACTION MAGAZINE, AUGUST 2006 ISSUE for featured article and details on my autocross T/A.

Offline EB3-GranCoupe

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Re: Anyone in here using composite leaf springs?
« Reply #62 on: June 14, 2016 - 07:39:56 PM »
 :popcorn:
(For future reference)