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This topic was originally posted in this forum: Modified Tech Talk
Author Topic:   Ride Heights
Rook 78
Member
posted April 06, 2004 06:30 AM     Click Here to See the Profile for Rook 78     
I have a metric chassies, last night we scaled the car. We are having a problem getting the front of the car lowered. We currently have 6 and 3/4 inches on left with an 800 lb spring. and about 5 and 3/4 on right side with a 1000 lb spring. those measurments are with jacks screwed all the way up. How critical is ride height? Is there anything we can do to rectify problem? Also, the springs are about 9 1/2" tall, a shorter spring would position the lower A-arm too close to the chassis and would bottom out.


NJantz
Member
posted April 06, 2004 07:17 AM     Click Here to See the Profile for NJantz     
Are your springs seated on the bottom of the lower control arm spring buckets? The metric control arm takes a different spring diameter than the chevelle. Have you put this car on the scales yet?

[This message has been edited by NJantz (edited April 06, 2004).]

Rook 78
Member
posted April 06, 2004 07:32 AM     Click Here to See the Profile for Rook 78     
The springs seem to be seated into the pockets, looks right, but what diameter should the spring be? I want to make sure they are right. We did scale the car last night, I dont have the totals with me, I will bring them back after lunch and let you know. We currently have 250 springs accross the back, we are going to put a 300 in the left rear tonite.


Rook 78
Member
posted April 06, 2004 11:29 AM     Click Here to See the Profile for Rook 78     
Could not get percentages because the scale is messed up, but here is the breakdown.
LF 541 RF 532
LR 728 RR 661


MOD75D
Member
posted April 06, 2004 05:04 PM     Click Here to See the Profile for MOD75D     
You might want to check with the chassis builder. Pro Chassis says to set the ride hight on there metric stub cars at 6 1/2 LF and 7 RF. So there might be a difference. What chassis do you have?


Limited Mod 57
Member
posted April 06, 2004 07:10 PM     Click Here to See the Profile for Limited Mod 57   Click Here to Email Limited Mod 57     
Rook, according to your numbers:

Left side percentage:51.54%
Rear: 56.42%
Cross: 51.18%

Also, make sure your front springs are set in the lower a-arms properly.(Though this may not apply to the a-arms your using)

------------------


CUSTOMPERFORMANCE
Member
posted April 07, 2004 03:43 AM     Click Here to See the Profile for CUSTOMPERFORMANCE   Click Here to Email CUSTOMPERFORMANCE     
If you have nova lowers on the metric it takes 5" diameter springs, if you have stock metric lowers they take 5 1/2" diameter springs. Also if you try running less than 6- 6 1/2 " ride heiths in front with stock lowers you wont have anymore than about 2" of lower control arm travel to the lower of frame horns in rear of crossmember which isnt enough depending on what track conditions. I would set them at 6 1/2 lf 7" rf and 7 1/2" lr and 8" rr measured behind the seat between the bottom of frame and ground in rear and the front right behind the tire where the side rails meet with the stub. Also in the rear it may have to vary a bit if you have less than 2 3/4" of clearence between the underslung and the bottom of the axle tubes. If you dont have builders info this will help you get going. Hope this helps, Richard

[This message has been edited by CUSTOMPERFORMANCE (edited April 07, 2004).]

Dman
Member
posted April 07, 2004 12:53 PM     Click Here to See the Profile for Dman     
Our GRT metric runs at 6 RF 5/12 LF.When looking at clearances between the a-frame and the frame you have to remember that 2 to three inches of wheel travel is about 1 in. at the point of your concern at the frame.The only time we have bottomed the aframe is from making contact with a BIG rut or another car. Anything
less than 3 ins. between the underslung and the rearend housing on the rear is not enough.But maybe you need to run a PRO chassis that high to get it to work.


dirtracer14
Member
posted April 07, 2004 07:08 PM     Click Here to See the Profile for dirtracer14   Click Here to Email dirtracer14     
I have had 2 cars with metric and both took 8 1/2" springs...i did try 9" and got just what you said the spring was right at the top and the bolt was allmost not needed. I run 2" on the rf at the a arm frame and 1 3/4" on the lf and only time i bottom is rough tracks.....


Rook 78
Member
posted April 08, 2004 11:41 AM     Click Here to See the Profile for Rook 78     
Thanks alot for the info you guys, once again very helpful. I took the car out for play day last night. Since I am a Rook, I brought my brother along so he could drive it and tell me if it was working. Other than carb problems, everything went well the car worked pretty good. My only concern when I took it out was not screw up and take it home in pieces. Thanks again!!


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