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Author Topic:   skyrocket mod question
juni
Dirt Maniac

Total posts: 184
posted February 02, 2005 10:16 PM  
Why do these chassis have the right front rear lower control mount cut and moved out , which moves the rf. lower ball joint forward? is it for caster gain or somthing else?

rpm20
Dirt Freak

Total posts: 338
posted February 03, 2005 02:25 AM  
i really dont know but most rules wouldnt allow moving that to a different location.
maybe someone else like kelly himself could answer that, are they really relocated??

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted February 03, 2005 07:18 AM  
Never heard of that before.

#13 mod
Dirt Full Roller

Total posts: 72
posted February 03, 2005 07:44 AM  
he's probably moved them to change the front roll center. maybe that's why his car's turn so well.

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted February 03, 2005 11:10 AM  
Are you sure the mount is cut and moved?
I have heard of guys slotting the hole and moving the bolt location then plating over the slot but not cutting the mount loose and movign it.

Kromulous
Dirt Forum Champ
Total posts: 796
posted February 03, 2005 11:28 AM  
It would add lead to the RF wheel, probaly to compensate for running alot of RF caster.

Theory (my own theory):

Rear axle square (to the chassis CL), front end square at the lower ball joints (to the chassis CL). On the RF if you run say 5* caster and 1 to 2* positive on the LF you in effect made the wheel base shorter on the right side.

Same thing as trailing or leading the RR. Basicly adding a tight condition from the get go.

If you lead the RF, longer wheelbase on the right side intially then you add caster it will basicly bring the wheel base back to even side to side. Then you get the benefit of caster and 0 lead / trail on the rear end.

Pierce does about the same thing, but i actually think they install the clip at an angle.

Cant get close enough to one to find out, with a tape measure in hand. Thats what i heard from a good source so...

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted February 03, 2005 12:36 PM  
I heard someone ask kelly one time about whether to square the rearned to the chassis or to the front like say the lower ball joints. He said definetly go off the chassis. That way if the stub isnt welded in square then it doesnt throw your rearend off. He didnt seem real concerned with where the front was at.

My take on that: The front wheels turn independently so you can always set them to run straihgt ahead no matter if one is a little in front of the other. Its not like a solid axle where leading one tire will actually steer the whole axle. I woudl guess if he is doing that it is porb more for steering geometry or something. Like the post above said it will move the wheel back to stock (or close) after putting so much caster in it. Then the steering arm angles etc are back to stock, for clearance/geometry etc.

juni
Dirt Maniac

Total posts: 184
posted February 03, 2005 12:42 PM  
The one that i have seen up close has the mount cut and moved out, when the guy bought it they loaded it on their trailer and they had stops for the front wheels and the rf hit first they thought the car was bent then they got to looking and seen the mount was moved . Then they started looking at another one that was new last year and it was the same . I have heard that pierce puts their stub in at an angle also but they are using metric stubs this is the chevelle stub.I don't know if kelly wants to share his speed secrets with every one i don't blame him he has a fast set up .

donslink1
Dirt Freak

Total posts: 318
posted February 03, 2005 04:32 PM  
ya, Pierce puts lead in his front end but turning the stubb. and a Skyrocket is a copy of a Pierce with a chevelle stub, So he is probly doing it too!
I dont know of any sanction that lets you cut and move the lower control arm mounts.

hjoe
Dirt Maniac

Total posts: 132
posted February 03, 2005 06:02 PM  
well of theses cars and it is not cut or moved in any way shape or form to help my car is a 04

lowrider
Dirt Roller

Total posts: 12
posted February 05, 2005 05:28 AM  
I've had a 03,04,& waiting on my 05 skyrocket like hjoe said these mounts are not moved or altered at all. Not even slotted bolt holes. Maybe the one's you looked at had been tore off & not repaired properly by someone.If it was fixed at Shryock's it would have been back in the stock location.

donslink1
Dirt Freak

Total posts: 318
posted February 05, 2005 08:22 AM  
Does he put lead in his stubb like Pierce.
thats probly why the rf hit first.

juni
Dirt Maniac

Total posts: 184
posted February 05, 2005 09:36 AM  
They must have been repaired if everybodys elses is in stock location .I'm gonna check his car out when usmts comes to town this year.I don't think any one around bought one this year they all bought pierce ,kraft ,dirtworks and racemart mods .I've been told that kelly has one long waiting list for a new car so he must be doing somthing rite.

CUSTOMPERFORMANCE
Dirt Forum Champ
Total posts: 1172
posted February 05, 2005 10:24 AM  
If there was a difference in front tire size and if the car wasnt perfectly square on the trailer that would be an explanation as to why one tire hit first. I have been to his shop and i can tell you he does not move the lower control mts around. I have as well as all the other manufacturers rewelded the rear lower control mts to replace bad ones on a stub before the car is built or after a wreck and its been on the frame machine.

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