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Author Topic:   setup adjustment ideas
rocket36
Dirt Freak

Total posts: 209
posted January 07, 2004 02:11 AM  
running a 4 link 2000 spec rocket chassis with dry sumped, 415cui, iron engine.
running on a 7-10deg banked, clay, 1/3 mile track that has been "slicking off" quite early.
suffering from a push entering the corner. i can't "set" the car without jabbing the brakes real hard which then turns the condition into a way loose. have tried getting right out of the throttle and also tried running down low and braking early but the car still pushes up toward the fence.
any suggestions.

lf- 500lb, rf-400lb, lr-275lb, rr-225lb.
54% rear, 54% left, 53%X (approx. 160lb wedge).
6" stagger.
rr top arm- top hole
rr lower - 0deg (level)
lr top - second hole from top
lr lower - +5 deg (pointing up)

rf shock - 5, lf shock - 3, rr shock - 4.5,
lr shock - 4.5 in front/ 0 behind w/spring

j-bar all the way up at frame, 2nd hole up on pinion plate.

lift arm @ 38" (300lb/3valve) with 6th coil in front. 9/1 wrap up shock on top of diff.

rf tire pressure -10, lf -8, rr -10, lr -6.

car doesn't seem to roll over onto the rf/rr like the others. have raised the fuel cell 1 inch and have 30lbs lead mounted above rr shock.

i have been considering lifting the lr bottom rod to +10deg and rr bottom rod to +5 deg, but not real sure.

any suggestions would be greatly appreciated from late model or modified guys (or anyone for that matter).

2nd2none
Dirt Forum Champ
Total posts: 755
posted January 07, 2004 06:20 AM  
With a all steel engine and only 54% rear does the car hook up at all? From what I've been told, all steel motors require more rear % because of all the weight on the front.....harder to transfer the weight to the back when getting into the gas. Try a 200 spring on the RR for that small of a track, it will loosen it up getting in and tighten it up coming off.

orange2mod
Dirt Maniac

Total posts: 113
posted January 07, 2004 06:21 AM  
I would try replacing left rear with a 250 and drop the cross some. I run my cell about 2" below the deck and the car rolls over pretty good. Check engine height and battery height also.

GO 24
Dirt Freak

Total posts: 366
posted January 07, 2004 02:52 PM  
Yeah I agree with the other guys, I'd try 55% rear, drop the cross 20-30lbs, change the lr to 250 for sure amd maybe even try a 375 in the rf (but I'd try the other suggestions 1st). Alot of guys around here are taking the 90/10 off because it's supposed to loosen in, I haven't tried it yet. The bars look good.

orange2mod
Dirt Maniac

Total posts: 113
posted January 07, 2004 05:50 PM  
In looking at your profile I see that it says you are from Australia. If so, don't you sit on the right and run in the opposite direction? If this is right you have a lot of work to do.

rocket36
Dirt Freak

Total posts: 209
posted January 08, 2004 07:05 AM  
yes, i do run in australia.
dirt late models were introduced over here about 7 years ago and are really starting to take off. we run to the renegade (stars) rules (except with a 2200lb weight limit).
our car is an early model rocket that has been updated to 2000 spec and imported to australia (and we run the same direction as you guys) there are a couple of ex steve shaver cars (rayburns & rockets) a couple other rockets, a couple of new grt's, and a couple of mastersbilt's as well as some cars built by australian constructors.

thanks for the ideas.
switching to a 3 valve shock on the LR (in front w/spring mounted behind on a 0 valve shock) will have what effect on the car?

[This message has been edited by rocket36 (edited January 08, 2004).]

2nd2none
Dirt Forum Champ
Total posts: 755
posted January 08, 2004 07:19 AM  
moving the shock infront on the LR with a dummy shock/spring behind helps calm the car down and also puts it in a bind.

rocket36
Dirt Freak

Total posts: 209
posted January 08, 2004 08:35 AM  
just re-read some of you guy's replys, and if i understand you correctly, by taking wedge out (lowering cross percentage) this would loosen the car up going in. i have been told in the past to do the opposite????

2nd2none: how does mounting the control shock in front of the birdcage (shock/spring behind steup) cause a bind? this seems to be a standard rocket practice and i have always run the car this way but i'm rather interested now. rocket told me they only run the control shock and spring behind on extremely dry slick tracks.

2nd2none
Dirt Forum Champ
Total posts: 755
posted January 08, 2004 12:51 PM  
Me personally have never ran the control shock infront dummy/spring behind, but from all the wisdom I've gained from reading these message boards I've read that the double shock puts the birdcage in a bind.

check your PM's


NJantz
Dirt Forum Champ
Total posts: 755
posted January 08, 2004 01:37 PM  
I'd think it would bind up the birdcage only if the shock length was too short.

cd2
Dirt Maniac

Total posts: 161
posted January 08, 2004 08:20 PM  
Rocket36 you can put a 200 spring on R.R. and this will loosen the car going in. Or you can soften the L.F.to a 400. You can swap the front springs around and this will loosen you going in.You can put a 2" spacer on the R.R. You can drop the 90-10 shock at the front and this will help. How much does the car weigh with the driver and what are the persentages?.You can have the 160# on the L.R.and still not have enough C.W. to loosen you going in.With 54% L.S.& 54% rear I would set the C.W. 54%-56%.If this makes the car too loose in an too tight off back it down until the car gets right.Take the L.R.%R.F.weight and subtract the L.F.%R.R.weight to see how much C.W.you have.The 160# on the L.R.probley comes from L.S.weight and not C.W. Other things can be causing the tight in but i would try this and see how the car responds. Let me know about the total weight& %. cd2

rocket36
Dirt Freak

Total posts: 209
posted January 09, 2004 04:07 AM  
mininmum weight limit of 2200lbs (after race, with driver).
53% cross.
we have tried running a pair of 450 springs in the front but i didn't really like that. this is when we switched to the "soft rf" setup. the car doesn't seem to bad early in the night when the track has good bite but changes pretty quickly. can't seem to make the rf stick when i first turn in (doesn't matter whether on or off the gas). the only way a can set the car is to jab the brakes really hard (3 wheel brakes) and then power up real hard. which as you can imagine is not nice to drive, turns into a very loose condition with the wheels spinning, car can only run one line, and its really easy to miss the entry all together.
thanks for the ideas guys

cd2
Dirt Maniac

Total posts: 161
posted January 10, 2004 08:32 PM  
Rocket36 could be a front end problum also.Might be best to go to the 4m.net sight and get hooked up with RocketBoneHead,Jimmy Judd or Bizkit. Between the three they can get you right.Good luck. cd2

sdhnc29
Dirt Forum Champ
Total posts: 934
posted January 26, 2004 11:35 PM  
rocket36,

Are you on the West Coast? PM me if no one has given you the latest setup sheet's. I'll be happy to make a copy and email them to you.

I ran the whole test series deal on the East Coast back in the early 90's. Team USA and all that. Right hand drive Super Sedans.......fun.....lol Had a great time! I miss my VB and Winfield blues though

------------------
Hendren Racing Engines
Rutherfordton , NC
(828)286-0780
Check out my other business at www.solemnvow.com A special thanks to jammin for the awesome job he has done for me on this site!!

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