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Author Topic:   left front way up
jrf3
Dirt Full Roller

Total posts: 28
posted August 31, 2004 10:14 AM  
Looking for some ideas. My left front is way up to the point it is scary. I have a dw8 with a four z rear suspenension. My left four bar has the spring clamped in front with 250 spring and lower bar is up one hole from level and the top bar is 2 holes down from the top. My rt rear z has the 200 spring on top of the rearend with the bars level. Also have the car scaled with 90 lbs of bite. The car has good traction and seems to work pretty wellmost of the time. I have the left front problem when we add weight to the car for the dry tracks. Looking for some ideas to get the left front down without loosing a whole lot of bite.

zeroracing
Dirt Forum Champ
Total posts: 1875
posted August 31, 2004 11:10 AM  
lower the upper bar angle, we had the same problem, you could see the driveshaft when i cam down the straight.(from the infield). it was bogging motors down. anyways go with more rr bar angle in the rearward bar, that will add some more thrust to the car so it will not squat as much. then on the lr lower the upper bar angle, the car will be freer off but drivable.

zeroracing
Dirt Forum Champ
Total posts: 1875
posted August 31, 2004 11:12 AM  
double check your ride hiehgts on the front, i had mine way off also before and had the car monster 3 wheel i had the ride hieghts off and made the roll center where as soon as you touched the gas it was reaching for the sky.
it was the front end that was off

[This message has been edited by zeroracing (edited August 31, 2004).]

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted August 31, 2004 12:09 PM  
Also could try a 225 in the RR.
What do you have for a panhard bar? how much anlge?

jrf3
Dirt Full Roller

Total posts: 28
posted August 31, 2004 01:35 PM  
running a jbar 8" up on frame and 2nd hole up on pinion.

paulickr
Dirt Maniac

Total posts: 110
posted September 02, 2004 11:40 AM  
can you give me your exact setup?
i cant get my dw8 with a 4-z to lift the front at all.
wheel offsets, percentages, pulbarand panhard bar locations, link angles , springs ..shocks, springs spring locations.......everything. i want to see whats different than mine

de94wcc
Dirt Forum Racer

Total posts: 87
posted September 02, 2004 11:45 AM  
Yeah, try a 225 in the rr. We have the same problem. Where are you adding your lead? Maybe try keeping it low and to the left. I see the Skyrockets all have about 50# bolted low on the door bars inside the cockpit. We run with a lot of them that run a similar setup to yours and they seem to be able to control the wheelie action a little bit that way.

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted September 02, 2004 11:55 AM  
Are you sure that it is legal or even advisable to bolt lead in the cockpit. What if it comes loose and you have a 25 or 50# chunk of lead banging into you.

I would try the 225 RR spring. If its only when you add weight then that spring might be too soft and lets that corner of the car compress more and lets the LF come up. Keep in mind you have to spring the car for the weight you are carrying. A car carrying 57% rear could be sprung lighter than a 60% car.

de94wcc
Dirt Forum Racer

Total posts: 87
posted September 02, 2004 12:17 PM  
I think in IMCA you can bolt lead anywhere insided the body of the car. Someone correct me if they have some rules handy.

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted September 02, 2004 02:35 PM  
These are from 2003 but I dont think they have changed:

19. WEIGHT: Track has option to enforce minimum weight limit of 2,450 pounds, no tolerance, after race with driver in car (will be mandatory at all tracks in 2004). ----No weights and/or loose objects in driver compartment or outside body.--- Weights must be securely mounted to frame or roll cage and painted white with car number on it. Must be attached with at least .5-inch bolts. No titanium, magnesium or carbon fiber products, parts or components. No gun-drilled, tubular, hollow bolts or studs. Steel fasteners only.

de94wcc
Dirt Forum Racer

Total posts: 87
posted September 02, 2004 04:19 PM  
Thanks for correcting me db.

Ego Racing
Dirt Forum Champ
Total posts: 724
posted September 02, 2004 05:47 PM  
Check your chassis mfg setup sheets. on some of the Rocket, T-N-T, and Shaw cars show to flip your rear springs when you lock down the left birdcage. We found this when we tried it on out car and the left front was going way up and would banging down VERY hard when we had a caution or had to slow. It was so bad we ran the last 11 laps green and I never knew the left front wheel came off until I went under the flagstand and lifted. It hit the ground and 3 car ran into me as they were comming out of 4. The right rear was going so far down the body was clean of paint where it was rubbing the track and the right rear dented the deck lid aluminum up about 2 inches.

black95gst
Dirt Roller

Total posts: 15
posted September 03, 2004 10:07 AM  
Why would you wanna Jeff it looks so neat lol. Yea you've gotta try and get that down and get the power to the track. Did you ever think of changing your pitch angle on the rear end, that would get you more forward bite comming out.

[This message has been edited by black95gst (edited September 03, 2004).]

Majic Maker
Dirt Full Roller

Total posts: 36
posted September 03, 2004 03:19 PM  
Level out your lower lr trailing arm and put some angle in your rr trailing arm.

jrf3
Dirt Full Roller

Total posts: 28
posted September 03, 2004 03:35 PM  
added more angle on rt rear bars and moved my weight mounts down. Going to give that a try tonight. Black95gst- call me stupid but what do you mean by pitch angle?

black95gst
Dirt Roller

Total posts: 15
posted September 03, 2004 10:05 PM  
The angle of your rear end. Put a degree thingy on your plate that the J-bar is hooked to. Most people run 9-11 degrees. It will make your car get an insane amount of forward bite and keep your front end more on the ground. BTW why didnt you show for the feature you looked like you kept the front down in the heat but i didnt see the whole thing. Also put the wieght over your rear end not on the back of your car. It dead weight back there and when you break loose it makes the car spin around faster. We found that out that it has to be over the rearend.

[This message has been edited by black95gst (edited September 03, 2004).]

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