wonderd

sry if im in the wrong section, dont really know where this should go but anyways, i have a question that i am asking just for knowing not any specific application

if you add weight to the rear of a completely stock s2000 will this add oversteer or lessen oversteer? ive seen 2 diffrent theories as to why im asking.

an example would be to put on a lightweight aftermarker exhaust, is this going to make the rear swing out more? or keep the back tires planted?

or adding a subwoofer to a stock s2000 is going to help keep the rear planted? or add more oversteer

i always thought more weight to either the front or back will keep the tires planted where ever you added the weight like more weight in the back will keep the back planted better and more weight in the front will keep the front planted better?

krnmike

there's no definite answer. it depends.
it's understeer in general

wonderd

kinda of confused about your reply krnmike could anyone answer my question more direct with a scientific explination? would adding weight to the back of the car cause oversteer or reduce it?, would adding weight to the front of the car cause understeer or reduce it? were talking about a completly stock s2000

krnmike

I don't know how much weight you are talking about, but adding weight to the rear will understeer in general. i don't konw how you expect a direct answer when there's so many variables that are involved.
how much weight are you talking about?
of course 10,000 pound to the front of the car will give you understeer on turning, but so will it when you have 10,000 pounds in the rear and accelerating a turn (because the front nose will be up in the air ).

are you talking about braking / turn?
during a turn?
coming out of a turn?
how much weight?

krnmike

lighter rear = less understeer in general / more oversteer in general
heavier rear = less oversteer in general / more understeer in general

braking = weight shifts forward. front compresses, rear decompresses
accelerating = weight shifts towards the rear. front decompresses, rear compresses

wonderd

ok see thats what i was looking for u said
lighter rear = less understeer in general / more oversteer in general
heavier rear = less oversteer in general / more understeer in general

but this guy says something thats completly oposite in this link(i quoted what he said tho)
https://www.s2ki.com/forums/index.php?showt...=0&#entry533286


QUOTE
Originally posted by Schatten
I personally love understeer, and this just dials in more oversteer that I would need (if I had that exhaust) to adjust the car even more to dial in more understeer.

Not sure what you're saying here, but in general, adding weight
to the front moves balance towards understeer
to the rear moves balance towards oversteer
since the tires at that end have more weight to move around the corner.

Also relevant to the discussion of weight reduction is where.
If 1lb. off the body = 1x,
1 pound off parts rotating at wheel speed = ~3-5x, depending on the radius (lighter wheels being more beneficial than lighter axles)
1 pound off parts rotating at engine speed = ~10+x, also depending on where

The S2000 was built pretty light as is; parts that normally shed a lot of pounds - a CF hood for example - is only a few pounds lighter than the S2K's aluminum piece. If you look at some of the fancy CF parts made by Amuse or whomever, $1 per gram of weight reduction is about right...

A lean stock-class autocross S2000's competition weight is ~2650 lbs. with about 250 crank HP. That's 10.6 lb/hp, not bad!

krnmike

calculations will be irrelevant.
like i said, it's very general and depends on lots of different things.

If adding more weight to the front causes oversteer say..
what happens if the weight is so much that the front tires reach threshold before the rears do? that causes understeer.

bellwilliam

It does depends on a lot of things. but in general I disagree: everything else equal in the dry, on track. adding 100LB of weight to rear adds oversteer. look at 911 and CRX

krnmike

[quote name='bellwilliam' date='Jan 4 2009, 10:22 PM'] I disagree:

krnmike

[quote name='bellwilliam' date='Jan 4 2009, 10:22 PM'] It does depends on a lot of things.