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Author Topic:   Rear suspension
modfan
Dirt Full Roller

Total posts: 50
posted October 13, 2004 06:59 PM  
I've have a mono leaf car. Right now I can't get any bite anywhere on the track. The car is at 2800lbs 56% rear 50% cross and 52%left. I run on a high banked 1/4mile in mid missouri. I'm thinking of changing the rear to stacked leaf on the left and keeping the mono on the right. I don't want to change from leafs. Any suggestions?

zeroracing
Dirt Forum Champ
Total posts: 1875
posted October 13, 2004 07:17 PM  
for now, more rear % and put the car on a diet. also how old are the springs?
i would 3 link it personally.

BIGDADDYBOZ
Dirt Freak

Total posts: 466
posted October 13, 2004 09:11 PM  
I would PM WORLDCOM on here. He runs a leaf car and is pretty good at settin them up.

modfan
Dirt Full Roller

Total posts: 50
posted October 14, 2004 04:32 PM  
It really isn't the car that needs to be on the diet. The season is over for me and I was thinking of things I can do to make it hook up better. I'm going to move the fuel cell backward to increase my rear %. I was just wanting to know if anyone had any other ideas

dogwalker
Dirt Full Roller

Total posts: 65
posted October 15, 2004 11:54 AM  
Modfan, the age of the springs on a monoleaf is really critical. I've heard fast monoleaf drivers changing their springs (leafs) every 4 races or so. With new tires and springs the car should get some bite. You need to add about 85lbs to your rear percentage. Will moving the fuel cell give you that much? Car is a little heavy, but it appears heavy all over given rear % if you don't already have lead on it. Mine is 2460 with me in it and i'm 200+ change. Good luck.


modfan
Dirt Full Roller

Total posts: 50
posted October 15, 2004 01:21 PM  
The car with no lead and 5 gallons of fuel weighs 2400. With me in it and putting lead on it jacks it up to 2760. I had tp put the weight on it to get percentages close to what I need. The car has always had problem hooking up even with brand new springs. I can move the cell back about a foot. Right now I was just wondering If going to a stacked leaf on the left will help it hook

dogwalker
Dirt Full Roller

Total posts: 65
posted October 15, 2004 02:20 PM  
The part that's difficult is that it doesn't get bit anywhere on the track. I don't think changing from a mono to stack will make much of a difference (see what other think). Most would probably agrue for mono over stack because they can wrap more to get bite on dryslick.

Do you have a solid pull bar? That could cause difficulty in getting bite. I had one and switched to a spring bar and it made a huge difference. Run a biscuit now and it works too. The only other thing I could think of is if the rear end is square. A long time ago I had a monoleaf car with a trailing box under the right monoleaf to adjust rear steer. If it's trailed too much it creates a loose condition that would make it difficult to get in the gas.

If all else fails, I would try another chassis, most likely a 3 link car if your after simplicity and consistency. Hope others can help with suggestions.

[This message has been edited by dogwalker (edited October 15, 2004).]

modfan
Dirt Full Roller

Total posts: 50
posted October 15, 2004 06:23 PM  
I started with a spring bar and kept lossening it. Now theres no bar. One of the things that gets me is if I mash the gas at the end of the straight the rear will still come around. It's kinda nice for setting the into the corner but I really have to feather it coming off the corner.

A new chassis is pretty much out of the question. I'm going down and talk to the guy that built it and see if he has any suggestions. Thanks for the help

thebomb
Dirt Maniac

Total posts: 149
posted October 17, 2004 12:00 AM  
hey mod fan check you pm's

dirtywrench13
Dirt Freak

Total posts: 324
posted October 17, 2004 06:49 AM  
U NEED TO CHECK LEED IF IT WANTS TO COME AROUND ON THE THROTTLE,RUN IT STRAIGHT OR SHORTEN THE RIGHT SIDE. MOVE YOUR BALAST WEIGHT TO THE REAR OF THE CAR,I'D LEAVE THE FUEL CELL WHERE IT IS FOR NOW.

superdave
Dirt Freak

Total posts: 280
posted October 17, 2004 12:15 PM  
Are you saying you have NO pull bar or torque arm with your mono leafs?


Racer X
Dirt Freak

Total posts: 256
posted October 17, 2004 06:20 PM  
We run a stacked leaf on the left and a mono, coil on top the housing on the right with no pull bar. We run around 52% cross and around 59 to 60 rear and weigh in at around 2750. What kind of horsepower are you running? We tried to run a hog motor early in the season and could never hook it up,went to a basic flat top dart head 350 and it was a totally different car.We are building a new car for next year(3 link)so our old car will be for sale cheap if any one is intrested.

fordstockcar
Dirt Newbie

Total posts: 3
posted November 14, 2004 10:00 PM  
im running a lm with monoleafs and was wondering if anybody runs or has run with out a pull bar ?, with only a a shock on the top . just wondering what would happen it it was taken off?

Biggs
Dirt Newbie

Total posts: 1
posted November 20, 2004 06:33 PM  
modfan, i run a mono on bolth sides with the spring on top of housing on rr (150lb) and a (200lb) on the lr with a elimanater in frunt of the rearend with 100lbs of bite and it works good for me.

bachshute
Dirt Maniac

Total posts: 118
posted November 20, 2004 08:22 PM  
try a stack leaf on the LR like you are thinking , run a half leaf on RR with 200# coil spring on top of housing , change the coil spring as you need to for slick or tacky , no pull bar needed , 90-10 shock on top of rear , good side bite great forward bite , your handling problem could be to much HP.leafs are good but i think they will only handle so many horses, hopes this helps some

Greggie
Dirt Freak

Total posts: 298
posted November 20, 2004 08:38 PM  
Modfan, I used to run a Stack/mono car and loved it when I could run the top and on a cushion. I crashed it really hard just as I was getting the slick figured out, but here is what I learned.... It likes ride height. I had mine about 7 1/2" in the air on the RF. Cross weight is a good thing. 52-53% was not out of line. Soft shocks. My car weight was nearly identical to yours and I was on 93's and 763/753's. One thing I recommend you do is put a torque are on the rear end. You HAVE to have something on a mono car to handle rear end wrap. Also, a brake floater on the RR will tighten you up on entry if you tune it right.

Greggie

orange2mod
Dirt Maniac

Total posts: 113
posted November 21, 2004 07:53 AM  
We run a multi on the left and a mono on the right with a 175 coil on top the housing. No 3rd link, no panhard, no 90-10 and this thing hooks unbelievably. Go to 4m.net and ask for Scooter or dirtrace21 and they will set you up with what you need. Also Randy at Racemart in Memphis,Mo. can help alot as he is building my next chassis, a FR-1. Also float the RR on a bird cage. Randy has these parts avail. Hope this helps some.

ctfarm
Dirt Freak

Total posts: 206
posted November 21, 2004 09:02 AM  
You never mentioned anything about the spring mounting points or if you are using sliders or shackles.Lowering the front mounts increases forward bite.If your using sliders the spring needs to centered in the slot at ride height.The rear mount needs to be 10-12" higher than the front.We run the same setup as orange2mod.Take the car to a good alignment shop and get it square.

[This message has been edited by ctfarm (edited November 21, 2004).]

modfan
Dirt Full Roller

Total posts: 50
posted November 21, 2004 03:52 PM  
Thanks for all the ideas. I found the right side is trailing by about an inch. The car is currently on shackles with the rear about 12 inches higher then the front. I've decided I'm going to change it over to a three link for next year and use a torque arm to get better forward bite.

orange2mod
Dirt Maniac

Total posts: 113
posted November 22, 2004 05:54 PM  
BOOOOOOOOOOO! Bars are for drinking.

FlyNLoIMCA17
Dirt Forum Champ
Total posts: 753
posted November 22, 2004 10:38 PM  
quote:
Originally posted by orange2mod:
BOOOOOOOOOOO! Bars are for drinking.


one is just as good as the other. Bars, leafs, it doesn't matter. If bars are for drinkin, then what are leafs for??? Hanging on trees or falling out of them and hitting every limb on the way down?? LOL!!!!

orange2mod
Dirt Maniac

Total posts: 113
posted November 23, 2004 06:29 PM  
Done that after the drinking.

fr1
Dirt Forum Racer

Total posts: 93
posted November 24, 2004 11:12 AM  
We like to haul the amish during the week.

ALCOHOL
Dirt Full Roller

Total posts: 46
posted November 24, 2004 08:34 PM  
Go to www.4m.net and look around on the mod site. Look for a user by the name of Scooter 40. He can tell you anything you want about leaf cars. He's ran them for years and kicks *** in them.

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