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Author Topic:   need forward bite on metric
YAZ
Dirt Maniac

Total posts: 147
posted September 09, 2005 07:45 PM  
I cant seem to get any forward bite.
have 52% rear weight. 225 rear springs
been told by two different guys to install
heavier rear springs. will this help at all?

Racer0
Dirt Maniac

Total posts: 149
posted September 09, 2005 08:13 PM  
What is your cross and left side weight? Also how about ride heights? My short answer would be try a softer rr spring like a 200lb. Also shocks, that could help. Just need some more info...

racer17j
Dirt Forum Champ
Total posts: 5390
posted September 09, 2005 08:31 PM  
left 55%
cross 52%
rear 52%
225 lbs left rear bite

tried a 200lb on rr- pushed bad in center

Eljojo
Dirt Forum Champ
Total posts: 968
posted September 10, 2005 04:15 AM  
Your left % is (imho) too high. When you put the 200 in the rr you drasticly increased the cross. Move some ballast. That's the only way to effectivly change the left percentage. Put the 200 back in the rr and get your bite down to the 150 175 range.
Good luck.

Racer0
Dirt Maniac

Total posts: 149
posted September 10, 2005 08:57 AM  
I agree with Eljojo, left side weight too high. Try going back to the 200 spring with around 53% left weight and lower your bite a little. Here is mine...

225lr 200rr
53% left
52% cross
54% rear
145 lbs left rear bite
pro wb 94 shocks

Car has good bite and tire temps are close. this is on 1/4 mile tracks.

Steve Dupree
Dirt Freak

Total posts: 316
posted September 10, 2005 12:10 PM  
I really like this subject we changed alot this week in springs and cross and kept are left side weight around the same cant wait to try it tonite with what you guys wrote. We have been running for about 5weeks with a 258 lr and a 235 rr spring and were running a 49.1 cross 52.8 left and 48.8 rear and a 54 lb. bite. We changed things around and went to a 235 lr and 207 rr with a 53.8 left 49.5 rear and a 50.6 cross with the same total weight just changed springs and ride heights a little and moved ballist around to get what we wanted. We can change the left weight with just moving ballist and i think we will for the main event but want to try the car this way first. Take care guys and goodluck to all running tonite.

racer17j
Dirt Forum Champ
Total posts: 5390
posted September 10, 2005 03:15 PM  
Go back to the 200 right rear and soften up your left front. How stiff of a left front spring are you running?

Your left side weight is fine as long as you can get the car into the corner.

[This message has been edited by CLBaker25 (edited September 12, 2005).]

YAZ
Dirt Maniac

Total posts: 147
posted September 11, 2005 09:05 PM  
sprins are 900lf 1150rf
225lr 225rr
I put the 200 back in and tried to
get the left side percent down, but cant seem to get below 54.6 , I raised the rear ride hight to 2" higher than the front.
I reed some where on the sight that it will
help with forward bite.
my lf ride hight is 3/4" lower than the rf, if I lower it more will that take out some left side weight?

Eljojo
Dirt Forum Champ
Total posts: 968
posted September 12, 2005 04:24 AM  
Honest YAZ, the only way you can effectivly change weight #'s from left to right (or front to rear) is to move ballast. Weight jacks, tire sizes, air pressures, etc will change corner weights, but not the static weight of that half of the car. At the risk of being rude I will repeat myself: move ballast. You are still too high on left side percentage! You have also lost a considerable amount of bite. You will want to add a shim to the right front to get it back.
I have to totaly disagree with CLBaker about the left percentage, Asphalt cars set up with a lot of left. Many tracks mandate the wax left percent they are allowed. Find yourself a veteran paved track driver and ask him if his car gets decent sidebite!
I would not suggest spending another night at the track until you set your car up properly.

CLBaker25
Dirt Maniac

Total posts: 193
posted September 12, 2005 08:29 AM  
IMO, The biggest thing that affects exit is forward bite. Loading up the left rear is one of the easiest ways to get forward bite.

Yaz,

You said the car pushed bad in the center. How much stagger did you have in the car? Maybe you were too low on stagger. When our car is really hooked up we put a little extra stagger in to get the car to turn while it is still hooked. We don't go over a 1 1/2 when it is hooked. We usually run an inch of stagger normally. This should help your car turn in the middle. How is your caster and camber? This may be causing your car to not want to turn in the middle.

iowa_dirt_track_girl
Dirt Freak

Total posts: 461
posted September 12, 2005 06:37 PM  
Fellas you guys are forgetting something what about wheels offsets that really is the easiest way to change you car fast and easy it makes just enough adjustment to make the car right if it is close to begin with.


CLBaker25
Dirt Maniac

Total posts: 193
posted September 12, 2005 08:14 PM  
If your car was good on entry and exit but tight in the middle what offset change would you make to get it better in the middle without effecting entry and exit? (Maybe right rear out, but I would think that would make the car worse on entry and exit)

I think the middle of the corner is mostly affected by shocks and springs and stagger.

YAZ
Dirt Maniac

Total posts: 147
posted September 12, 2005 09:58 PM  
ok I moved 150lbs from the left to the right.
I ended up with 53.7% left, 51.3% rear, 52.5% cross. 197 lbs bite.
seems like alot of weight on the right side, but I'll give it a try.

thanks for all your help

Eljojo
Dirt Forum Champ
Total posts: 968
posted September 13, 2005 04:20 AM  
That's a lot of bite and cross. See if you can put a shim under the right rear spring. That ought to improve your ride height and eliminate the excessive bite. Get down between 150 and 175....17J suggested 160.
Hang on dude 'cause you are fixin' to ride in a whole different race car!

Speedway65
Dirt Freak

Total posts: 344
posted September 13, 2005 07:20 AM  
If these were my wheel weights what would the lr bite be?

lf-947 rf-836
lr-688 rr-609

CLBaker25
Dirt Maniac

Total posts: 193
posted September 13, 2005 08:15 AM  
Bite= left rear weight - right rear weight
lr-688 rr-609 = 79 pounds of bite

Speedway65
Dirt Freak

Total posts: 344
posted September 13, 2005 10:36 AM  
How would i go about getting more bite in that car without increasing LS weight?

CLBaker25
Dirt Maniac

Total posts: 193
posted September 13, 2005 10:55 AM  
Does this car have weight jacks? If it does then put turns into the left rear weight jack. If not weight jack put in a spacer in. If that is not legal then put a bigger tire on the right front or a smaller tire on the left front.

Eljojo
Dirt Forum Champ
Total posts: 968
posted September 13, 2005 03:38 PM  
Speedway, You cannot change left percetage or rear percentage with weight jacks. You have only 42% rear with 53 left. You need to add some weight (or move) to the rear of that ride!

Speedway65
Dirt Freak

Total posts: 344
posted September 14, 2005 05:41 AM  
It has adjustable spacers in the rear so we will try that.The problem is that this particular car runs pavement and dirt both.So 2 different setups needed.And Eljojo there is no added ballast in this car........ yet LOL

YAZ
Dirt Maniac

Total posts: 147
posted September 20, 2005 09:36 PM  
well I took the car to a specail this weekend. was the worst handling car I
ever drove. as soon as I let off the gas
it would spin out.
I moved all the waight back to the left
to get 55% back. I did what clbaker said and added 30 more lbs. to the left rear.
I also did what dirt track girl said. and
added spacers to the wheels. I also added
more rear bite to 260lbs.

handle the best it ever has.

    

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