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Author Topic:   Prostock/limited latemodel dryslick setup
Jamie Throckmorton
Dirt Full Roller

Total posts: 29
posted June 25, 2005 02:24 PM  
I bought a Stinger 4 link Stock ford strut clip car and got no setup info from the seller. I have raced it 6 times and have finished second in all 6 races with several shots at winning until the track slicks up badly. The car is tight on entry in the heat races but still drivable to win or run up front, In the main it gets in decent maybe just a hair tight but is tight in the middle and sideways and loose with little forward bite. These are the specs on the car. 2900 lbs after,358 steel engine up on the balljoint at #1 plug ,10" wheels 8" american racers,5 off backspacing,800 lb lf,950 lb rf,250 lr,225 rr,75 lf shock,76 rf shock,lr dummy shock with spring behind rearend with 7 compression and 3 rebound on front side of rearend floated both,rr shock 94, 90/10 on top of rearend,34" 5th coil with 6th coil,5th coil spring is a 12" 300 and 73 shock, has a 24" j-bar from left outside to right side of pinion and is at center of pinion and 6" up on frame.53% left, 56% rear,120 lr bite, 4 link rods left top in 2nd hole down,left bottom in 2nd hole up,right top in 2nd hole down,right bottom in 2nd hole up. Have tried various changes but this setup seems to have me close and i guess it could be worse but i know something small might make a world of difference or maybe im just way out of the ball park. Thanks for any info.

sdhnc29
Dirt Forum Champ
Total posts: 934
posted June 26, 2005 01:25 PM  
Jamie,

From what you described, it sound's like you are tight entering the corner. This will usually result in being tight through the middle, which makes you have to turn the car and break it loose to get it off the corner. Of course this result's in the lack of forward bite that you have, and the overall loose feeling.

Personally I would first do away with the 90/10 over the rear end. It is simply not needed since you have a 6th coil. You can then use the 6th coil spring as an added tuning devise for corner entry, as it should be used. Most commonly you would run a 400lb 6th coil spring. A 300lb spring can be used to tighten the car on entry, and a 600lb spring can be used to loosen the car. But 400 is a good starting point.

Some quick fixes that would also help (working around the spring's that you are running), without getting too technical, would be to 1st add more bite to the car. This will loosen corner entry, and tighten you up coming off. 2nd would be to put the dummy shock in front of the housing, and your valved shock on the spring, which will get you up on the bar's quicker, induce roll steer faster, and help you get through the middle and off the corner (you can use a 4/0 or a 6/0 in front of the housing to keep the car on the bar's longer as you exit the corner, and help to keep the car from dropping too quickly). 3rd would be to play with your bottom bar's, especially the RR bottom. Raising the RR bottom rod 1 hole will loosen entry, lowering it will tighten entry and plant the RR tire.

If you feel that you're real close, then ditch the 90/10 first and try it. Use the other suggestions to fine tune the car. Don't try everything at the same time though. Get a baseline on what each change does for you, then you gain knowledge from this and can apply each change at the right time.

Good luck!
Steve

------------------
Hendren Racing Engines
Rutherfordton , NC
(828)286-0780
www.hendrensracingengines.com
www.experienceodessa.com

Jamie Throckmorton
Dirt Full Roller

Total posts: 29
posted June 26, 2005 02:21 PM  
Thanks for the help Steve.

Jamie Throckmorton
Dirt Full Roller

Total posts: 29
posted June 26, 2005 02:40 PM  
Steve, The next thing i was going to try was to remove the 90/10. What do you think about the panhard bar heights.When i first ran the car it had a 18" sraight bar from the left side center of the pinion and they had it 8" up on the frame side. They ran a short tight track in Tenn, I race at a big 3/8s momentum pretty flat d shaped dry track. I switched it over to a 24" aluminum j-bar off of the right side of the pinion and have run it at 7" and 6". Should i move it down lower. Will that help it in the middle or make it worse. Also this car came from JT Kerr Stinger chassis as a round tube latemodel.Then a guy named Ken Lecroy put the ford clip on it and supposedly won a lot of races with it like this.Stinger said the car came with a 34" 36" rearend the car now has a 32" 37". They call for a side to side measurement from lower rail to the inside rotor of 12 7/8".The car came to me at about 11 1/2". Stinger told me any info they could give me would be wrong and i would just have to wing it. What do you think. Thanks Again Jamie.

sdhnc29
Dirt Forum Champ
Total posts: 934
posted June 27, 2005 04:52 PM  
I'll be honest, the stock front clip, small tires, and the front spring's do not compare to anything that I am doing. But I can tell you from experience that the straight P-bar is good on stop and go type track's. Your 24" bar should work ok for momentum track's, but I think you're too low on the frame. When I used to run a 24" bar in my GRT, we started no lower than 9" on the frame, and 2nd hole from the bottom on the pinion. Being as low as you have yours, I would think it would give a feeling of being tight, but in reality the car is just sliding. I think the back end of the Stinger is like a GRT, or they used to be, so you might want to try the 18-1/4" J-bar. Start at 8" on the frame, and 2nd hole up on the pinion. This is a pretty standard starting point.

As for the side to side measurement, I too would have no idea what this would be. And yes it would have a big affect on side bite, or lack of side bite.

As close as you think you are, I would "baby step" any changes that you might make. You don't want to dial yourself out of the ballpark. 2nd place money is still better than 5th ;-))

Steve

------------------
Hendren Racing Engines
Rutherfordton , NC
(828)286-0780
www.hendrensracingengines.com
www.experienceodessa.com

Jamie Throckmorton
Dirt Full Roller

Total posts: 29
posted June 30, 2005 09:05 PM  
What spring rate would you run on the 5th arm. I have been running a 33 1/2" arm with a 300 lb spring and have tried a 250 also with 73 shock and still lights the tires. Track is a momentum track and very dry and sandy surface. Was thinking of lighter spring rate what would you suggest.

Jamie Throckmorton
Dirt Full Roller

Total posts: 29
posted June 30, 2005 09:08 PM  
Sorry also thinking of lengthening arm to 36" also.Thanks Jamie.

sdhnc29
Dirt Forum Champ
Total posts: 934
posted June 30, 2005 11:05 PM  
I'd start with a 300 @ 36". If the car is breaking loose up off the corner, then you can soften it to a 275 or 250. I think the smaller tire's would like the longer 5th arm and a soft spring. But you'll have to play with it.

Steve

------------------
Hendren Racing Engines
Rutherfordton , NC
(828)286-0780
www.hendrensracingengines.com
www.experienceodessa.com

Jamie Throckmorton
Dirt Full Roller

Total posts: 29
posted July 04, 2005 06:17 PM  
I have also run all 6 races with different front springs trying to help get the back hooked. With the 2900lb rule and the smaller tires and the engine up on the balljoint i started with 800 lf and 650 rf buried the shocks but turned good went to a 900 lf and 800 rf still pretty good but really traveling the rf to the heim,switched to the 800 lf 900 rf and 800lf 950 rf now the car is skating the nose and looser off. lenghtened the 5th coil to 36" put a 73 shock on with a 12" 225 spring and a 400lb 6th coil and took the 90/10 off of the top of the quickchange. Hopefully this helps the forward but now im debating on what front springs to use. Leaning towards a 850 lf and 800 rf . What do ya think.

Jamie Throckmorton
Dirt Full Roller

Total posts: 29
posted July 16, 2005 04:26 PM  
Did the changes(removed 90/10)freed car up on entry,won heat from the back by a straightaway,Came from the middle to passing for the lead on lap 12 and msd coil quit. Thanks for the info. Jamie.

BMOORE8617
Dirt Newbie

Total posts: 4
posted July 26, 2005 02:48 AM  
My dad ran a stinger for about 4-5 years on a momentum track we didnt run it with a stock clip but this is what we ran

springs/shocks percentages
lf 600-75 rf 450-75 54% inside
lr 250-93 rr 300-94 56% rear
52% cross
j-bar about 9'' on frame down on pinion
6 degrees of pinion angle
4 bars left top in top hole{indexed on birdcage} left bottom in bottom hole right top in top hole right bottom in top hole about 3'' of stagger
200 lbs off lr
400lb 5th coil on a 73 shock
dont run no 90/10s
all you would do is stiffen your front springs up in the front like you do have but im telling you we ran ours for about 4 or 5 years sold 2 or 3 up here last time we ran our stinger it was a rocket in the corner and off nothing could touch it its up to you if ya wanna try it but im not bull******* you its like lightnin

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