Center of gravity.

[TwoJ's]

Does anyone happen to know the height of the CoG is for a "lowered" late model 325? This is a shot in the dark, but I am hoping that someone has gone through the trouble of doing some testing and measuring, and maybe published it so that I can just cite them and call it close enough.

[BeirBrennerE30]

You are going to have to measure it yourself. Everycar is different. Find some cornerscales or a weighstation that has a pretty accurate scale and you can calculate it from that.

[T Verdier]

Wouldn't you have to measure every inch of the car how much things weigh, and where everythings is for a accurate reading? It sound like something that would use lasers and fancy things like that

[Iain]

You can do it with stringlines.

This is one of the issues with lowering a car too much. Looks fully sick, bro, but fucks your roll centres and increases understeer.

[george graves]

You can do it with stringlines.

Wut?

[Farbin Kaiber]

Why wut? Don't you know "Old-School" hot rod tech?

[Iain]

Wut?

String-lines ain't high tech and require a few caveats but can be done.

Caveats:

#1 - a floor you know and can prove is dead level. Just using a concrete slab isnt' enough for me.
#2 - precise measurements. Use x2 tape measures or x2 rules. I don't trust one. I am weird, though.
#3 - don't do it after being on the piss at lunch.
#4 - take your time.

[george graves]

Why wut? Don't you know "Old-School" hot rod tech?

Nope - this should be good. I can see getting to know where the CG is front to rear - but not in the vertical directions. Not without a sloped floor, or hanging the car, ect...DO TELL!

String-lines ain't high tech and require a few caveats but can be done.

Caveats:

#1 - a floor you know and can prove is dead level. Just using a concrete slab isnt' enough for me.
#2 - precise measurements. Use x2 tape measures or x2 rules. I don't trust one. I am weird, though.
#3 - don't do it after being on the piss at lunch.
#4 - take your time.

#5 not following - can you elaborate?

[karpiel]

Jack it up till it flips.

[Nic01101011]

String-lines ain't high tech and require a few caveats but can be done.

Caveats:

#1 - a floor you know and can prove is dead level. Just using a concrete slab isnt' enough for me.
#2 - precise measurements. Use x2 tape measures or x2 rules. I don't trust one. I am weird, though.
#3 - don't do it after being on the piss at lunch.
#4 - take your time.

wtf?

[Aptyp]

You are going to have to measure it yourself. Everycar is different. Find some cornerscales or a weighstation that has a pretty accurate scale and you can calculate it from that.

I think that will only give you a COG in a single plane. Also, I am not following Aussie. What's he's saying makes no sense.

[george graves]

^that's what I said!

#3 - don't do it after being on the piss at lunch.

I think this means drunk.

[Iain]

Another caveat - I have been drinking at a company lunch. Beer on a hot day FTW.

You guys are talking about measuring roll centres, yes? Finding the point the car rolls around in bends? http://stockcarproducts.com/pstech3.htm ??? You can do it with stringlines, though its nowhere near as accurate as using a calculator (best really just for showing when you've lowered a car too much). For most people with street-driven cars this will be enough to get your car "near-on", like doing a wheel alignment with stringlines.

These are some I found Googling, which are also a lot more intensive:

http://www.hrpworld.com/index.cfm?tpc=Roll_Center_Calculator&form_prod_id=354,126_1204&action=product

http://performancetrends.com/rc.htm

http://www.rctech.net/forum/electric-road/288021-roll-centre-camber-gain-calculator.html

[Charlie]

^that's what I said!



I think this means drunk.

Fag means cigarette.

-Charlie

[TwoJ's]

Another caveat - I have been drinking at a company lunch. Beer on a hot day FTW.

You guys are talking about measuring roll centres, yes? Finding the point the car rolls around in bends? http://stockcarproducts.com/pstech3.htm ??? You can do it with stringlines, though its nowhere near as accurate as using a calculator (best really just for showing when you've lowered a car too much). For most people with street-driven cars this will be enough to get your car "near-on", like doing a wheel alignment with stringlines.

These are some I found Googling, which are also a lot more intensive:

http://www.hrpworld.com/index.cfm?tpc=Roll_Center_Calculator&form_prod_id=354,126_1204&action=product

http://performancetrends.com/rc.htm

http://www.rctech.net/forum/electric...alculator.html

Thank you for searching around for me. However, roll center and center of gravity (or rather center of mass) are two completely different things. I forgive you since you are intoxicated.

By the way, I'm jealous. I wish it were summer here right now.


Like BeirBrenner said, I will have to find some corner scales and do it empirically.