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Author Topic:   ANYONE HAVE A GRT MOD?
66RACER
Dirt Full Roller

Total posts: 26
posted July 12, 2004 09:35 PM  
I HAVE JUST BAUGHTEN A GRT MODEL 309 MODIFIED. MY QUESTION IS THE SET-UP. ON THE GRT HOME PAGE, THEY CALL FOR:
LF-900lb RF-1000lb LR-300lb RR-275lb
THE SHOCKS ARE ABOUT THE SAME AS EVERYONE ELSE. THESE SOUND HEAVY TO ME. DOES ANYONE HAVE ANY IMPUT?

badfastjr
Dirt Maniac

Total posts: 193
posted July 12, 2004 10:44 PM  
is this the car from racersauction.com,
the reason why their so heavy is this is probably a swing arm car, or at least thats what the setup is for. and the front springs are exactly what we run.

NJantz
Dirt Forum Champ
Total posts: 755
posted July 13, 2004 05:46 AM  
I have chassis #283. It is set up as a 4bar/zlink right now. If you are running those springs on a little quarter mile, then yes I agree they are a bit on the heavy side.

36modracer
Dirt Maniac

Total posts: 126
posted July 13, 2004 06:36 AM  
HAVE HAD CHASSIS 208 AND NOW 350. WE RUN A 800 ON LF AND 850 ON RF AND ITS THE BEST ITS EVER BEEN, ROLLS THROUGH THE CORNERS MUCH BETTER. HAVE TRIED 1000 ON RF AND TO STIFF, RAN A 900 MOSTLY LAST YEAR THERE BUT DROPPED IT AND ITS BETTER. EVEN TRIED A 800 EVEN SPLIT BUT A BIT TO SOFT ON RF THEN. RUNNING THE SAME REARS AND HAVE RUN A 250 ON RR SOME. WE RUN ON 3/8-1/4 MI TRACKS IN ILL. CARS WERE BOTH SWING ARM HOWEVER NOW WE HAVE CHANGED THIS ONE ON THE LR AND TAKEN OFF THE REAR TRAILING ARM AND SIMPLY LOCKED DOWN THE LR SO ITS LIKE A 2 LINK. LEFT EVERYTHING THE SAME OTHER THAN THAT AND IT WORKS NICELY ON ALL TRACK CONDITIONS, ESPECIALLY DRYSLICK. ALSO PUT A STRAIGHT BAR ON INSTEAD OF J-BAR AND IT HELPS ALOT AS WELL. RUNNING IT FROM LEFT SIDE TO SAME SIDE OF PINION WITH ABOUT A 3 1/2 INCH INCLINE ON CHASSIS. WE RUN UMP WITH HOOSIER TIRES AND ALSO RUN BILSTEIN SHOCKS RATHER THAN THE AFCO

66RACER
Dirt Full Roller

Total posts: 26
posted July 13, 2004 07:06 AM  
THE CAR IS A 3-LINK SHORT BAR SET-UP. I JUST BAUGHT THE CAR, STARTING TO GO THROUGH EVERYTHING, SO I DON'T KNOW FOR SURE WHAT SRINGS ARE EVEN IN IT. WE RUN A BIG 3/8 MILE TRACK THAT GETS VERY DRY SLICK. JUST TRYING TO GET AHEAD OF THE GAME FOR NEXT YEAR. I APPRECIATE ANY AND ALL INFO.

chizelnutz
Dirt Newbie

Total posts: 3
posted July 21, 2004 09:00 AM  
Don't know why but with metric stubs we run a lot heavier springs in the front. 1000 & 900 are actually good starting points. We started out with a 750 then worked up to 1000 in the RF to before it stopped bottoming out. Especially when the LR gets up on the bars.

Dman
Dirt Freak

Total posts: 270
posted July 22, 2004 07:42 AM  
On our GRT mod we have tried running softer than 1000 on the right front but it bottoms if you run rough or banked tracks up against the cushion.
The Metric a-frame has the spring pocket closer to the mounts than the Chevelles.This changes the "motion ratio".This means there is more leverage working on the spring so you have to be stiffer, but it still works out the same at the wheel as the chevelles with their 850s.

21dirtracernw
Dirt Full Roller

Total posts: 29
posted July 22, 2004 08:18 AM  
We just bought haven't picked it up yet a 03 grt and was woundering if the setups you guys are describing on on here is a good base setup for a 3/8's high bank and a 3/8's low bank one?We don't know what is in the car till I go and pick it up but was wondering if the grt base setups that they have on there web page are a good stating point? WE are going from a 2 link to this so I guess we are starting all over again.
Any help would be great..

Thanks.

21dirtracernw
Dirt Full Roller

Total posts: 29
posted July 22, 2004 08:19 AM  
oh and the chassis # is 373..

Dman
Dirt Freak

Total posts: 270
posted July 23, 2004 08:26 AM  
The suggested set up from GRT is a good starter.We have won a few set up as they suggest.Good Luck!

GrnHornRacing
Dirt Full Roller

Total posts: 57
posted July 23, 2004 09:55 AM  
Hey 21dirtracernw, are you going to pick that car up in Oklahoma, if so that car was really fast set up the way it is, i saw it one week have a half a lap lead on a field that had the points leader who has won 6 Features this year at that track. The track is a 3/8 semibanked track that it was ran on, you might want to try the setup the way it is now.

21dirtracernw
Dirt Full Roller

Total posts: 29
posted July 24, 2004 08:38 AM  
yep that is the one we are getting, this will be big change from what we have been running. Now that I think we got our car figured out. Oh well it will be setup for my kid for next year and we will get to start all over again.. Sounds like its going to be great starting over again through.
Maybe just have to stick that motor in it and run it this year..



GrnHornRacing
Dirt Full Roller

Total posts: 57
posted July 24, 2004 09:21 AM  
Yeah that seems to be the way he is selling it. Just stick your motor in and go. I would try the way it is set up now and just give it a shot.

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