Metric setup help

[bjcrawfo]

Track is a very high banked 4/10mile dirt track. Its a bomber class.

LF 800 RF1250

LR 225 RR 200

Car handles good through the longer turns on the track which is 3 and 4, but in 1 and 2 the car is very tight and pushes up the track very bad. Running street tires BFG.

air pressures

LF 15 RF 18

LR 15 RR 16

I have been told to take 1/2 to 3/4 shims out of RR. Not sure. Any help would be appreciated.

[mudeater18]

Make sure the RF spring is not bottoming out causing your push. 1250lbs sounds heavy but not necessarily for a metric front. A friend of mine use to run 1400 in the RF and 1200 in the LF of his bomber and he won about 40 features in 3 years with it. It was a 3000 lb weight rule class.

[Dirt Knife]

Metric

950 LF 900RF

You are way to heavy RF its just like you put a solid bar there

Your nose Weight should be your spring weight /2

Make shure your shocks are not hitting or binding up.

what front end settings do you have

3250 total weight car with 1700 min nose weight I ran 900 and 850

Let it plant in the corners

JMO

[Dirt Knife]

Air Pres.

Bump the Rf up to 20 or 22 and the RR to 18

The side walls dont give you any benifit

Dont take the shims out of the RR
Dont trust the guy who told you that.

[mudeater18]

950 LF 900RF

You are way to heavy RF its just like you put a solid bar there

Your nose Weight should be your spring weight /2

Make shure your shocks are not hitting or binding up.

what front end settings do you have

3250 total weight car with 1700 min nose weight I ran 900 and 850

Let it plant in the corners

JMO

Not trying to start anything, but that's just not correct info. Chevelle lowers have a 36% ratio. Metric lowers have a 23% ratio. If you have a 650 spring in a Chevelle you have 234# at the balljoint (650 x 36%= 234). So to get close to that with Metric lowers you'd have to run a 1000# spring (1000 x 23%= 230) to get 230# at the balljoint.. Modifieds with metric lowers run 1000-1200# front springs and they weigh 2400# and have 56 - 58% rear weight which has the fr wheel weights in the 500# range. Soft front spring setups are for 4 bar cars in which the birdcage can index and add LR when hiked up. Higher banked tracks also require stiffer front springs, because the car is pushed toward the track during cornering as opposed to rolling toward the RF. I'd make sure the RF isn't bottoming. Take the RF spring out. Jack up the RF wheel and see what will hit first (lower A arm to frame, shock travel, etc). Put a piece of duct tape where it will hit. Hotlap it and look at the tape. If it bottomed you'll see it on the tape. If yes, add more spring untill it doesn't bottom. I bet a 1400 or 1500# RF will fix it !

[Dirt Knife]

http://www.youtube.com/watch?v=HvLawQqu2QQ

#50 car starting in 5th position it has the #31 on the hood for a sponsor

post says 950 lf 900 rf not 650 like in my mod

notice after the 2 yahoos in front finaly break clean with 3 laps to go to where I go around them
The 2 yahoos are 5th and 6th in points

3 laps to go by by notice how the r f stays pinned down not like a pogo stick

your nose weight shold be your front spring /2 aprox.

[Dirt Knife]

another way to look at it.

shock travel indicators if your right rear has 4" compression
your R front should have the same. what ever the ### 3" comp. 2" comp ect.
ballance the chassis

if your Right rear has 4" comp. and your Right Front only 1/4"
or 2-1/4" with all the whole weight of the car on it ???? 3100#s

unless yor running 36* banking

just a thought

[mudeater18]

post says 950 lf 900 rf not 650 like in my mod

Sorry I lost you. The 650 was an example to explain the ratios. I'm not arguing with you. Maybe the original poster will get what he needs from my answer. Have a nice day.

[mudeater18]

unless yor running 36* banking

Poster said "Track is a very high banked 4/10mile dirt track". I watched your video, track is as flat as a parking lot. Look at any set up sheet for changes when going to a banked track. It will say "INCREASE front spring rates".

[Dirt Knife]

Yes

You are correct.

He needs to look at his shock travel he pushes like a freight train in 1 and 2

When I took the my car same set up on a rain out date to another local track
30* 1/2 mile
it carried the left front
all thru the corner and passed 4 cars per turn had to sart in the back (visiting driver penalty)
they stoped the feature and kicked me off the track for good. no imca, or ump, wissota here

the corner with the stiffer spring will get the most weight and overloads the tire
if his caster and camber and toe are set right drop the spring rate
350+ lbs
do what your car needs ifit starts to push in 3-4 from bottoming out then bump up 50 lbs

my car ran 1" off of bottoming out I would guess he is 4" from that

[mudeater18]

Adding more rf spring will make the rf bottom out more not less. .

Whaaat ? Happy racing to you guys. lol !

[bjcrawfo]

Thanks

First of all, thanks for all the input! I called medieval chassis today and told them my problem and what I had to work with and basically they told me that the problem was that I had to much split in the front springs. They said that I needed to keep the 1250 in the right front, but to ditch the 800 LF and put a 1100 in the LF. That was there .02. So I'm gonna try some things and see.

[turner]

Make sure that if you are using a stock mount rf shock, that you space it down from the lower a frame atleast 3/8 " from my exp. I run stock car drivers setup, and it is the best thing ive ever done. Good luck.

[bjcrawfo]

Make sure that if you are using a stock mount rf shock, that you space it down from the lower a frame atleast 3/8 " from my exp. I run stock car drivers setup, and it is the best thing ive ever done. Good luck.

We do have to run shocks in stock location. What are you referring to space it down 3/8"?

[turner]

We do have to run shocks in stock location. What are you referring to space it down 3/8"?

When we ran the shock mounted to the lower A frame it would bottom out . You may need to put some washers between the lower a frame and the shock.( lower shock mount will be lower than a frame) We put 3/8 spacers in there and haven't bottomed it out since. Doesn't take alot , but it made a world of diff in the handling, because we were bottoming the shock out.