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Old 11-17-2005, 06:37 AM   #11326
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Originally Posted by BritRacer
is anyone else having issues with titanium screws backing out on the MSX??

It was not like this with the standard 415...i tightened all the screws before the race, then halfway through the rear shock tower falls off as all the crews have come out!!

Should I use locktite? I know this is strongly advised against by some people, but i dont see any other options.
I have had this problem on occasion, most notabley when a screw came loose and jammed the steering.

Anyway, I now tend to add just a tiny blob of the Tamiya blue threadlock, works a treat, and once done doesn't need to be reapplied for ages, if at all.

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Old 11-17-2005, 08:05 AM   #11327
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I'll be at the DEN this Sunday for the Allstar series with my fleet of 415's. If you need any help feel free to stop by. I'll be the guy w\ the orange carhartt hat.

jimmy
ok I will do that I will be there Sat and Sunday
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Old 11-17-2005, 01:10 PM   #11328
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Originally Posted by TryHard
As I was running the 2.5mm chassis, I just placed all the roll centres back to how they would have been with the 3mm. On your car, I'd leave them where they are, or maybe just raise the rear a bit (place shims under the rear blocks).

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roll centre doesnt change with thickness of chassis only ride height and droop!
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Old 11-17-2005, 01:26 PM   #11329
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Quote:
Originally Posted by trf racer
roll centre doesnt change with thickness of chassis only ride height and droop!
Actually, Roll center does change with the thickness of the chassis. If it didn't you would see all these new, thicker chassis with reliefs cut for the mounting of the cars bulkheads and stuff.

Just look at Corally's 4mm chassis. Same with X-Ray.
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Old 11-17-2005, 01:33 PM   #11330
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Originally Posted by koabich
Actually, Roll center does change with the thickness of the chassis. If it didn't you would see all these new, thicker chassis with reliefs cut for the mounting of the cars bulkheads and stuff.

Just look at Corally's 4mm chassis. Same with X-Ray.
no,it doesnt because if you lower the bulkheads and suspension by one mm everything is just lowered by one mm.
suspension geometry hasn changed.
wether you use a 1mm chassis or 5 mm chassis the only thing that changes is chassis stiffness ride height and droop.
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Old 11-17-2005, 02:18 PM   #11331
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Quote:
Originally Posted by trf racer
no,it doesnt because if you lower the bulkheads and suspension by one mm everything is just lowered by one mm.
suspension geometry hasn changed.
wether you use a 1mm chassis or 5 mm chassis the only thing that changes is chassis stiffness ride height and droop.
Yes it has.
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Old 11-17-2005, 03:06 PM   #11332
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Quote:
Originally Posted by trf racer
no,it doesnt because if you lower the bulkheads and suspension by one mm everything is just lowered by one mm.
suspension geometry hasn changed.
wether you use a 1mm chassis or 5 mm chassis the only thing that changes is chassis stiffness ride height and droop.
Not quite but I understand your logic.

A part of the formula used to determine the actual roll center of a car...any car...rc or otherwise is CENTER OF GRAVITY. For example, a car with a 5mm chassis will have a center of gravity that is 2mm higher than that of the same car with a 3mm thick chassis. Since you are increasing the vehicles center of gravity, you are also changing the car roll center!

Now back to my original point, that's why some manufactures that offer chassis with different thickness often have cut-outs of reliefs cut into the thicker chassis that allow you to mount the bulkheads lower in the chassis. This allows manufactures to use a thicker chassis but keep the center of gravity of their chassis' the same so the roll center is not effected.
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Old 11-17-2005, 04:34 PM   #11333
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Quote:
Originally Posted by trf racer
no,it doesnt because if you lower the bulkheads and suspension by one mm everything is just lowered by one mm.
suspension geometry hasn changed.
wether you use a 1mm chassis or 5 mm chassis the only thing that changes is chassis stiffness ride height and droop.
What you're saying is non sense. Think a bit mate, what does the roll center do when you change the ride height ? Say you're going from 5mm ride height to 4mm ride height, with the chassis still flat. What happens is, since the angles of the wishbones and turnbuckles are changed, the roll centre will drop by MORE than the ride height difference.

Now, what does a 2mm chassis changes ? Well it's like having a 3mm chassis but with 1mm less ride height, if you see wht i mean. So, the CoG is 1mm lower, but the Roll centre is MORE than 1mm lower (depending on the length, angle etc.. of the wishbones and turnbuckles).

This is, in my opinion, the MAIN reason why a thin chassis provides more grip, NOT the fact that it's less stiff.
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Old 11-18-2005, 08:51 AM   #11334
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hello,

For the moment I use the old suspension on my MSX and a yokomo diff with 46mm shaft on front.

If I use the MS suspension, can i still use my front diff with 46mm shaft?? or I must use the 48mm (Tamiya F201)???

thanks.
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Old 11-18-2005, 08:53 AM   #11335
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good question, I'm thinking about switching over myself
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Old 11-18-2005, 08:58 AM   #11336
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I enjoy the roll center discussion above...I have no clue when it comes to theory of roll centers, other than I go out there and wheel the crap of of my car and hope for the best..
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Old 11-18-2005, 09:47 AM   #11337
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Quote:
Originally Posted by trf racer
no,it doesnt because if you lower the bulkheads and suspension by one mm everything is just lowered by one mm.
suspension geometry hasn changed.
wether you use a 1mm chassis or 5 mm chassis the only thing that changes is chassis stiffness ride height and droop.
Well, look at it this way- (if you run 5mm ride height with a thicker or thinner chassis for example) the thinner chassis lowers the inner hinge pins, bulkheads and inner turn buckles correct? It didn't lower the outer hinge pins or turn buckles when you set the car on the ground....so the inner hinge pins and turnbuckles are even lower than the outter now.....you still think the geomtry of the suspension hasn't changed?
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Last edited by MikeR; 11-18-2005 at 11:53 AM.
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Old 11-18-2005, 11:08 AM   #11338
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what is the part #'s i need to put a ball diff in the front of my 415?
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Old 11-18-2005, 12:51 PM   #11339
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Quote:
Originally Posted by MikeR
Well, look at it this way- (if you run 5mm ride height with a thicker or thinner chassis for example) the thinner chassis lowers the inner hinge pins, bulkheads and inner turn buckles correct? It didn't lower the outer hinge pins or turn buckles when you set the car on the ground....so the inner hinge pins and turnbuckles are even lower than the outter now.....you still think the geomtry of the suspension hasn't changed?
ok now if u were to chane the back onlysay with a 3mm and add a 1mm or 0.50mm ...what does it do handling wise ....?
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Old 11-18-2005, 02:20 PM   #11340
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Could someone please help me out and tell me the part numbers for every part I need to build a front diff (yokomo diff)
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