Shock Tech
#931968
02/18/11 07:49 PM
02/18/11 07:49 PM
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Joined: Feb 2011
Posts: 43 IN
EricatAFCO
OP
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OP
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Joined: Feb 2011
Posts: 43
IN
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Ok guys. Let's get it going here.....
If we look at the question; "The car hooks then spin, or rear tire wads really bad from too hard of a hit to the tires?
Consider that the rear suspension typically goes into extension and the foot print (of the tire) gains weight as the housing travels toward the track. The side walls become loaded and apply downward force to the foot print. If we apply too much downward force, the tire will bounce. It is like a basketball. The harder you dribble the ball, the more it will want to return to your hand. Hit the tires too hard, they hook, wad up and then when the tire becomes round again-it will want to return to it's original shape and as the sidewall un-wads, it pushes up. That pushing up condition will relieve weight from the foot print causing wheel spin. It may be slight but it only takes a little amount. (One way this event shows up is if you see a car stretch out the front suspension as it leaves, then set the front end down only to pick it up again, it did the hook/spin deal and wadded the tires too much..
Consider a potential fix is to stiffen the extension of the rear shocks. Slowing down the separation and the extent that the rear housing (with it's mass) is traveling toward the track will result in planting the tires just enough to hook the car. Also, consider we only need enough traction to hook the available torque traveling down the driveline, thru the axles and to the rims/tires.
If you have a double adjustable shock, you can also stiffen the compression to help hold the tire down, slow the rebound effect and keep the weight at the foot print from being relieved too quickly.
There are other potential fixes too. Some aren't shock related...
Anyone have seen this before? Anyone driven a car that felt like this?
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Re: Shock Tech
[Re: EricatAFCO]
#931969
02/18/11 08:21 PM
02/18/11 08:21 PM
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Joined: Feb 2003
Posts: 3,998 GO BUCKS !!!!!!!
340RICK
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master
Joined: Feb 2003
Posts: 3,998
GO BUCKS !!!!!!!
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Nice to see you join the gang Eric I have seen this plenty of times as you stated. I put a pair of AFCO Big Guns on the back of the car. Compression is at 3 clicks from soft Extension is at 8 clicks from soft Car has very minimal body seperation just slight wrinkle in tire and pulls the front wheels up nicely. I had to tighted up the extension to achive this
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Re: Shock Tech
[Re: joshking440]
#931977
02/18/11 09:36 PM
02/18/11 09:36 PM
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Joined: Feb 2004
Posts: 6,257 acworth / N. georgia - south e...
cheapstreetdustr
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Posts: 6,257
acworth / N. georgia - south e...
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Eric..thanks for taking the time.. hopefully you wont have to have a thick skin to make it throught the tribulation of being new to this site.. Josh..go easy on him...you may have history with him before today.. but we dont want to baptise him by fire...so give him some breathing room.. as to your direct Question as to the hopping or porposeing..i am sure your gonna get a gammot of responses.. but guys when posting a question please put a little info on your perticular suspension . stock leaf-aftermarket leaf-ladder bar leaf-caltracs or 4 link, type set ups..as its hard to discern remidies for all suspensions..when each are effected differently. Eric. you mention'd some factors to these issues arent all shock related..some are suspension/spring related. some are addressed at the front of the car. some at the rear. we will all hit the patience button when reflecting on this thread.
365" Iron J heads,,3480lbs best 1.39 60ft on SS springs.10.54,124 mph ...6.67 1/8th et.average 60fts 1.46 w/ small cam &.063 no2 pill tagged & insured [image][/image]
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Re: Shock Tech
[Re: joshking440]
#931978
02/18/11 09:37 PM
02/18/11 09:37 PM
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Anonymous
Unregistered
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Anonymous
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I have seen cars when they launch, the car spins and hooks and kicks left. Front end doesn't have a chance to come up. I'm wondering if too heavy of a spring causes this.Ladder bar car with AFCO Double adjustables out back.
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Re: Shock Tech
[Re: cheapstreetdustr]
#931979
02/18/11 09:44 PM
02/18/11 09:44 PM
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Joined: Feb 2004
Posts: 6,257 acworth / N. georgia - south e...
cheapstreetdustr
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Joined: Feb 2004
Posts: 6,257
acworth / N. georgia - south e...
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Eric i dont know how intimate you are with Mopars specifically. there are some factors that are different when diagnosing mopar type leaf sprung rear suspensions. the short front spring half is a factor. just to bring this to light not judge anyones knowledge.. i just want to put this out there.. If we are talking about mopar leaf sprung rear suspensions.. then proper rear shackle movement is a necessity to eleviate rear spring bind..in the extension of rear suspension travel..its a common problem for mopars...so is too short a shock itself.. these are both huge contributors to porpousing ..ie..hook unhook/unload..hook on a leafspring drag car.. as you can see i am passionate about this.. i am no expert...just someone who doesnt mind jumping in...ive helped fix this with a bunch of mopars...and some of it is ubiquitous in our world. have at it.. cheapst.. and again Welcome...I am all ears..
365" Iron J heads,,3480lbs best 1.39 60ft on SS springs.10.54,124 mph ...6.67 1/8th et.average 60fts 1.46 w/ small cam &.063 no2 pill tagged & insured [image][/image]
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Re: Shock Tech
[Re: cheapstreetdustr]
#931980
02/18/11 10:08 PM
02/18/11 10:08 PM
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Joined: Dec 2004
Posts: 10,552 Rittman Ohio
fourgearsavoy
I Live Here
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I Live Here
Joined: Dec 2004
Posts: 10,552
Rittman Ohio
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Well I have recently changed shocks from Pro-Comp truck shocks to the Rancho XL9000 series adjustable socks and have noticed a positive change. My tires used to unload after the hit and wad up before they spun producing a very poor 1.7 60' time Now since installing the Rancho shocks I have cut my 60' down to 1.41 on a marginal starting line. The good shocks took the bounce out of the rear end and I am happy now and can see mid ten second ET's on the horizon Gus
64 Plymouth Savoy 493 Indy EZ's by Nick at Compu-Flow 5-Speed Richmond faceplate Liberty box Dana 60
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Re: Shock Tech
[Re: cheapstreetdustr]
#931981
02/18/11 10:14 PM
02/18/11 10:14 PM
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Joined: Nov 2009
Posts: 3,410 Belpre,Ohio
CHAPPER
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Belpre,Ohio
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I can see this is going to get confusing,,,it's like everybody is talking at once. Maybe,,try to answer one question at a time, and other posters have patience and just read and try to see if the questions posted are similar to their problems and learn from them...I hope Eric is ready for LOTS of PM's ...
If you like drag racing, support your local track.
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Re: Shock Tech
[Re: CHAPPER]
#931982
02/18/11 10:39 PM
02/18/11 10:39 PM
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Anonymous
Unregistered
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Anonymous
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Quote:
I can see this is going to get confusing,,,it's like everybody is talking at once. Maybe,,try to answer one question at a time, and other posters have patience and just read and try to see if the questions posted are similar to their problems and learn from them...I hope Eric is ready for LOTS of PM's ...
Well his 1st post was at 5:49 pm and he hasn't been back since.
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Re: Shock Tech
#931983
02/18/11 11:10 PM
02/18/11 11:10 PM
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Joined: May 2004
Posts: 2,864 IN
Irun5snd8th
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Posts: 2,864
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Quote:
Quote:
I can see this is going to get confusing,,,it's like everybody is talking at once. Maybe,,try to answer one question at a time, and other posters have patience and just read and try to see if the questions posted are similar to their problems and learn from them...I hope Eric is ready for LOTS of PM's ...
Well his 1st post was at 5:49 pm and he hasn't been back since.
Lets keep in mind that the guy has family and it is Friday night Also, the thread is out here to get us some good shock technical information. The post about the basketball is the kind of thing we are looking for to get all of us thinking. That put it in terms we can all understand. We all have a car and he wont be able to tune every car on here. So lets give him a chance to give us some good information
AFCO, Rons Fuel Injection sponsored Dodge Challenger
Mention Street Lethal Motorsports
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Re: Shock Tech
#931984
02/18/11 11:10 PM
02/18/11 11:10 PM
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Joined: Mar 2007
Posts: 1,608 Rudolph, Ohio
moparguy7074
top fuel
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top fuel
Joined: Mar 2007
Posts: 1,608
Rudolph, Ohio
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Quote:
Quote:
I can see this is going to get confusing,,,it's like everybody is talking at once. Maybe,,try to answer one question at a time, and other posters have patience and just read and try to see if the questions posted are similar to their problems and learn from them...I hope Eric is ready for LOTS of PM's ...
Well his 1st post was at 5:49 pm and he hasn't been back since.
If you saw the other thread on this, it wasnt supposed to start until Monday anyway.
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