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Author Topic:   GRT , LR behind the axle discussion . . . .
grz_mnky
Dirt Newbie

Total posts: 3
posted May 15, 2000 12:55 PM  
Hello everyone , was wanting to know if anyone wants to discuss set-ups with the LR behind the axle . What is the amount of spring split between left and right that is common ? I recently tried a 250 on the left 150 on the right , with a 17.5 inch panhard bar mounted on the (outside)left of the frame to the left of the pinion . Naturally , i found that the right was way to soft , bites like a SOB though . Went to a 200 pound right rear and lost a lot of side bite . Just was wondering what others people thoughts were on this .

rjp
Dirt Roller

Total posts: 24
posted May 15, 2000 11:04 PM  
grz_mnky:

we have tried the rear deal for the first time this year. Used it on three different tracks with various results. We have a GRT riggid car, the first night out we used 225RR, 275LR, 24.5" J-bar, we were on a big half mile with sweeping low-semi banked turns. Car was perfect to the drivers style.
I was surprised the car stayed relatively flat in the turns and didn't pick up the LF.
Used the same setup on a 3/8 semi-hi banked tacky track, with tighter transition to the straights, decreased our bite, car rolled alot and lifted the LF severely, a tick off the lead pace, we switched to the short
j-bar on the right side of pinion to help keep the LF down, it did help but we lost some of our body roll and generated a slight throttle push. We are still trying to figure the rear setup at this track. We are going to drop our rear springs down 25 lbs.
200RR 250LR. Tried it at a third track, 3/8 low bank very tight track, dry slick,
225RR 275LR 17.5" straight pan-hard, 180 lbs bite, car was good throughout corners, but LF lifted severely, but it sure rocketed off the corners. Had several late model teams say they've never seen a late model at this track lift as much as this car did that night. We are trying to bring some of the LF lifting under control. If you have any suggestions please respond. Does the stiffness of the LR spring affect the amount of lift? Does the riggid frame promote more lifting?

I'm glad you got this discussion started, I feel I have alot to learn with the behind the axle setup. Sorry I got long winded, to answer your question, GRT recommended a
50 lb. split for starters, but like I said, I am still learning.

[This message has been edited by rjp (edited 05-15-2000).]

grz_mnky
Dirt Newbie

Total posts: 3
posted May 16, 2000 01:00 PM  
One thing i believe in very strong is that what they recomend and what they actually use is conservative . That is why I went so drastic on the spring selection , this set up worked good for me with the LR spring in front . Next time out , I will have a 175 and a 200 set-up for the RR .
I am like you I have a lot of ideas but not a lot of time to work with them . Seems that both of us are experimenting in the same manner .
Are u using regular straight valve shocks ?

rjp
Dirt Roller

Total posts: 24
posted May 16, 2000 10:25 PM  
We are using 94's on back, this week we are going to try running a dummy shock with coil on rear and use a 94/6 shock on front of LR bird cage. Will let you know how it affects the handleing.

Question? what kind of chassis and type of track are you running?

We will be on a 3/8 semi-high banked black gumbo track, tends to dry out and take on some rubber. GRT riggid chassis

grz_mnky
Dirt Newbie

Total posts: 3
posted May 16, 2000 11:05 PM  
3/8 tight turn , semi banked , gets dry and takes rubber sometimes .
GRT square tube . . .

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