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Author Topic:   90/10 Shock ? on a 3 link
RentOcrew
Dirt Maniac

Total posts: 126
posted March 04, 2005 02:23 PM  
What is the purpose of a 90/10 shock? The reasn I ask is that the car I just got does not have a shock dampner on the rear end.
If I were to put one is there a specific angle it would need to be?

Xtreme12x
Dirt Forum Champ
Total posts: 874
posted March 04, 2005 04:14 PM  
Leave it off... On tacky tracks it does no good, and on the dry slick it will help to turn the car and get on the bars.

GRTWallbanger
Dirt Maniac

Total posts: 196
posted March 04, 2005 10:44 PM  
I thought you always want a 90/10 when using a pull bar becasue the braking force without one is what breaks pull bars.And believe me, you dont want to do that.I have seen it!

backofpack
Dirt Maniac

Total posts: 102
posted March 05, 2005 06:46 AM  
inquiring minds want to know i to have a three link without the shock but i do have mounts

donslink1
Dirt Freak

Total posts: 318
posted March 05, 2005 08:45 AM  
Put on the shock, you will bend, brake your pull bar, you will rip pull bar mounts off the car, I know of guys taking them off when there car was real tight coming in the corner, But that is just for one race, TOO MUCH SLAMMING BACK AND FOURTH. my thoughts

Xtreme12x
Dirt Forum Champ
Total posts: 874
posted March 05, 2005 08:49 AM  
Unless all the geometry is wrong you won't break your pull bar or bend it. We have ran with no 90-10 for years and have not broken one pull bar. We broke pull bars when we ran a 90-10 bilstein shock. You need to be sure you have the p ull bar pre load set right, or you could bend the bar itself. The best thing to run with no 90-10 is a custom made moly swedge tube like larson's sells. THey are stronger and won't break no matter what you do. You also need to have a rubber on the pull bar to help cushion the initial jolt.

nyimcamod8t
Dirt Full Roller

Total posts: 67
posted March 05, 2005 09:43 AM  
if the track you run at is dry slick i would put some mounts on and run the 90-10.the 90-10 helps keep the pullbar from unloading too fast on dry tracks, the car will tend to break traction if the pullbar unloads too fast.on a tacky track that can be an advantage, but on dry its gonna break the car loose when you lift going in the corner.

Xtreme12x
Dirt Forum Champ
Total posts: 874
posted March 05, 2005 10:12 AM  
Your close 8t but completely backwards on the thinkings. On a tacky track your rarely off the gas enough to unload the pull bar. On the dry track it allows you to put a lot of side bite in the car and get the car to turn.

mo6racing
Dirt Roller

Total posts: 22
posted March 05, 2005 10:26 AM  
It took 50 to 60 nights with out the 90/10, but I did break the pull bar mounts on the chassis. When I put a 90/10 on I did not notice a huge differance in handling

donslink1
Dirt Freak

Total posts: 318
posted March 05, 2005 11:04 AM  
8T is right the 90-10 is there to slow the pullbar down and load the rear tires on deceleration and braking. With out it, it will unload tires and loosen the car up.

RentOcrew
Dirt Maniac

Total posts: 126
posted March 05, 2005 12:22 PM  
Thanks for all the help guys, keep it coming. I am new to the REAL modifieds and I think I can learn more here than any book published or spending tons of money (which I do not have) renting a track. Thanks keep the advice coming.
I hear some people say that without the 90/10 on a dry slck track is a bad idea, well coudn't you alter your driving style a bit to compensate?

nyimcamod8t
Dirt Full Roller

Total posts: 67
posted March 05, 2005 05:28 PM  
xtreme, it's not thinking, it's experience.it doesn't take much lifting to unload the pullbar, and you can use that snapping back to break the rear tires loose. not the best way to do it,but it will work. donslink has it right, the 90-10 keeps the pull bar from unloading too fast. generally the 90-10 is mounted anywhere from level to 10 degrees up when the car is at ride height. when decelerating at corner entry the 90-10 will push upwards to a certain extent on the chassis and apply load to the rear tires. i had a jet mod a few years back that came to me without the 90-10 and that car sucked something fierce on entry on dry slick, we put the shock on and won a few races with that car.

Xtreme12x
Dirt Forum Champ
Total posts: 874
posted March 05, 2005 06:14 PM  
Its expierence i speak from too. On entry on a dry track it will loosen you up ( if your off the gas long enough to get off the bar)
More then likely most use it as a tuning tool. We don't run one unless the car is so loose going in that it wants to spin out (rare). A lot of times when that happens, we don't run a 90/10, but some other bilstien shock

dirtracer14
Dirt Forum Champ
Total posts: 1261
posted March 05, 2005 08:21 PM  
There are allot of other things to look at between the 90/10 working and not working on each car. Depending on pullbar angle what spring rate or what type of rubber, also were the springs are mounted in front clamped on cages or bars, plus the angle in your link bars....oh ya and were your shocks are mounted. I have run a car without that worked fine and i have taking one off one night on a diff car and broke the mounts for the pullbar from droping the car to fast with nothing to slow it down. Yes it can be a tuning tool if you put it all the way up 15 deg or so it will also lessen the drop of the rear a tad. If anyone would like to here me explain the bar angles,shock spring thing i will but might take a few pages

GRTWallbanger
Dirt Maniac

Total posts: 196
posted March 06, 2005 10:37 AM  
Let me run this by you guys.If the 90/10 applies force to the rear tires when you get off the gas.And you have a lot of LR weight(200lbs)Then is it possible that more force will be applied to the LR tire causing the car to get loose.
The reason i bring this up is one night the track was smoked and we never ran a 90/10 so i put one on for qualifing, quess what!!!!
The **** thing spun out on corner entry.

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