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Old 23 Mar 2007, 20:16 (Ref:1874776)   #1
trikesrule
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Leaf spring problem

Guys the Speedway team I'm with have purchased a 'Junior' car. It's a 80 Corolla with a 3k engine. I was laying under the car checking things out (some of the crap you see is amazing) and making notes of of possible areas to be immediately improved. So going to the back first (the car was up with blocks under the tyres and the shed floor is dead flat). The right rear leaf spring is virtually straight and the left rear leaf is bending the wrong way. Before we purchased this car I have watched this car spin spin spin and thought something amiss there and mused about it. Well the laughter is on the other foot now cause I have too fix her. Now the Rule Makers said NO to me cutting the floor and raising the hangers so I can have the springs reset and regain some suspension movement and they said NO to when I suggested lowering blocks. My intention was to retain the running heights it's set too as it's not far away. Everything must remain visually standard thats the bottom line. Sooo has anyone any fabulous suggestions or should I just reset the leaf springs and raise the rear put the car on the scales and possible raise the front as well.............trikes
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Old 24 Mar 2007, 14:54 (Ref:1875088)   #2
graham bahr
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graham bahr should be qualifying in the top 10 on the gridgraham bahr should be qualifying in the top 10 on the grid
sounds like you need to have the springs re tempered and decambered whilst at it, that will give them both the correct shape and the ride height you desire
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Old 24 Mar 2007, 20:26 (Ref:1875242)   #3
bdwoody
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If the car is being used on an oval track we used to use new single leaf springs and have the ends hydraulic pressed to lower the car to the ride hight required..one higher than the other..
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Old 26 Mar 2007, 01:00 (Ref:1876336)   #4
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Yes, you need to get the main leaves reset. They should be able to be reset to what ever ride height you wish if the rules allow.

I also run a Corolla, but racing on dirt circuits, and found that I had to soften the rear leaves by removing a leaf fom the pack to try and reduce the amount of oversteer I was experienceing.

Also check to make sure you dont have a dud shock under there aswell and while your under there unbolt the rear antiroll bar as it will cause excessive oversteer on dirt.

Last edited by coln72; 26 Mar 2007 at 01:04.
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Old 27 Mar 2007, 10:29 (Ref:1877504)   #5
trikesrule
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Took the shocks out and checked them out and all ok. Recorded their numbers and put them back in. Our car model isn't allowed to run a rear sway bar. If it did it would be ditched. I can't run a single leaf cause it's not standard. But I reckon I could get away with changing the number of leafs (rate). A re-set is planned for next week. The right front strut is very cleverly bent about half way down to give the right front wheel some camber. Who ever did that did a really good job.........trikes

Last edited by trikesrule; 27 Mar 2007 at 10:33.
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Old 28 Mar 2007, 01:52 (Ref:1878127)   #6
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Mine has had the front crossmember redrilled to move the pivot point out about an inch (and up slightly). Dont think there is enough metal to do this on a later model though.

Technically this is illegal but no one has noticed as the crossmember is covered with mud
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Old 29 Mar 2007, 09:36 (Ref:1879019)   #7
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Hey coln72 we have to leave our suspension pick points std also. That totally sucks as the kids that drive these cars are not driving a car that is resistant to roll overs. R/o' happen regularly in this class. So it will be a challenge to get this car to 'sit right' on the track at speed. We're not even allowed to put specialized shocks like Afco or other speedway shocks in. This scenerio is just plain dangerous to me. I'm glad one of my kids dosen't run this class. The cars really are a bad accident looking for a place to happen. But I'm making noises so the powers that be can have a look at fixing some of the stupid rulings...........trikes
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Old 30 Mar 2007, 02:34 (Ref:1879618)   #8
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Trikes - even though you are stuck with the standard shocks, you could refill them with a thicker oil to try to reduce some of the body roll. Just dont use old sump oil like I did the first time, the seals didn't like that too much........
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Old 30 Mar 2007, 22:30 (Ref:1880166)   #9
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Old sump oil? Coln72 did that help with your traction problem? I smell a new thread.........trikes
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Old 31 Mar 2007, 05:36 (Ref:1880271)   #10
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Stiffened the front up nicely until the oil ate the strut seals and pumped itself back out

If you dismantle the front strut, empty the original oil out and refill with the correct amount of hydrolic oil it should be good. I have the correct amount of oil in a manual somewhere around here.

Bikes have been doing this since the word go. I no of an Anglia that had grease nipples fitted to its front struts...............
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Old 31 Mar 2007, 22:52 (Ref:1880754)   #11
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Hi Graham. What do u mean by decambered?.......trikes
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Old 31 Mar 2007, 22:56 (Ref:1880756)   #12
trikesrule
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Coln72 I will have a good hard think and do some research. But I reckon mucking about with shock oil viscosity might be the way to go......trikes (grease hhmm)
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Old 31 Mar 2007, 23:00 (Ref:1880759)   #13
trikesrule
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bdwoody I asked the powers that be about single leaf springs. He yelled NO!!! then chuckled and said it must be visually std. Said I'd get away with removing maybe one leaf (grey areas - I found another).........trikes
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Old 1 Apr 2007, 23:38 (Ref:1881628)   #14
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Shortening a leaf isn't exactly removing them...........its still there
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Old 4 Apr 2007, 05:18 (Ref:1883075)   #15
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Don't shorten the secondary springs forward of the axle,clamp them to the main leaf to avoid axle tramp,shorten them progressively behind the axle to soften the rate.
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