tire pressure and weight balancing

[mynismo]

what's the right tire pressure to get the best speed & acceleration in your car? i have 215 & 225 ZR 45/17

also, what's the deal with having your car evenly balanced? im a newbie here. will you get better accelleration if your car's weight is balanced between front and rear?

[CAptynCrunch]

Weight distrubution isn't something thats directly linked to acceleration. It's more for improved handling, however
inproved handling=better grip=faster speeds=able to accelerate sooner=
it's all good.

Now for straight line acceleration as in drag racing it's more about weight transfer, which is achieved through proper suspension tuning and can really help a car up it's traction and therefore it's acceleration.

Pretty simplified I know, but I leaving to go out to dinner right now so, it'll have to do

[mynismo]

that's what i was wondering... i took out my rear seats a couple weeks ago and just put them back in today. my car really seemed to pick up good w/o them but i haven't driven it yet with them back in. i thought that some extra weight in the back will improve traction on the rear tires.

?

maybe its good to have more weight in the back because of the traction and the AA tires i have. i'll report back after i drive it tonite, leaving in about 10 min to go to class

[flylwsi]

if you're running on a track (road course) you would want to inflate to the max tire pressure recommended by the tire manufacturer.

a good weight balance will help keep you stable in corners, as noted previously...

taking the back seat out of your car will have a better effect overall simply b/c of weight reduction, and since it's kinda in the middle, it's not going to kill your f/r balance. i wouldn't worry about it. if it feels faster, that's pretty good... i doubt you'd be that far on a knife edge where you'd feel the balance difference without the seat in... and think about it...

race cars have no rear seats... neither should you...

move your battery to the trunk, it takes weight off the nose, and "equals" everything out...

[old_s13]

"if you're running on a track (road course) you would want to inflate to the max tire pressure recommended by the tire manufacturer. "

Uhmmmmmmm....NO. You want to inflate to a pressure that gives you the most contact patch and least amount of flex. Max PSI is a safety precaution!!!


"a good weight balance will help keep you stable in corners, as noted previously..."

Good corner balancing makes the car predictable and more balanced.

As for the battery, come on.. it doesnt make that much of a difference. If you have a sealed battery, then do it.. but there is no way I would put a regular battery inside my cabin.

- Mike

[CAptynCrunch]

Originally posted by old_s13
Uhmmmmmmm....NO. You want to inflate to a pressure that gives you the most contact patch and least amount of flex. Max PSI is a safety precaution!!!

Good point, a lot of people are under the misconception that the more tire pressure and the stiffer the suspension the better, but really it's the opposite.

Technically you want the softest suspension setting and lowest tire pressure you can possibly have while staying within the limits of the course to keep the car from bottoming out, flexing etc...

The softer the ride the better contact the tires maintain with the road and therefore the better grip.

[old_s13]

It depends on the terrain you are driving on. If you are driving on a perfect track, sure.. a super stiff solid suspension is great.. of course, to a certain point. You still have to have SOME give and take, that way the car doesnt hop around when you take off. The McLaren F1 is an interesting example, because even though its a supercar, its designed for both street AND race. Its actually pretty soft for a car so exotic.. you see it lean a lot, which is not commonly seen in cars like that. That is why its still a good "street car" -- a bit of comfort as well.

Then take the race-prepped mid-engine Porches, they are pretty crazy as to how stiff they are.. I bet its all solid ball joint suspension.. not sure if there are ANY bushings! Perfect for track.

As for rally cars, its quite obvious they need SOMETHING to take the abuse those cars get. I've never seen a rally car with ultra low-profile 20" wheels.. their goal is having as much traction as possible, regardless of the terrain. There's no such thing as drifting, the entire COARSES are usually being drifted!!!

You have to consider the terrain before you can just shell out specs. For my city driving, I have a 245/45/16x8 tire/wheel, respectively. I found that my car behaves really well around 34PSI front, 32 rear.

- Mike

[mynismo]

i just seen a yellow ferrari on my way home


anyways, thats why i was asking about the tire pressure, i've heard both ways to inflate all the way or inflate to about 90%. i still dont know... ??

hmm... as far as taking out the back seats, i weighed them and they only came out to about 25 lbs TOPS.... it's not worth the ugly look with the seats out so i put them back in.

btw mike, i dont know what it is about it, but my car will soon look almost exactly like yours with the exception of the 180sx lights. im getting my spoiler ripped off and hatch repainted monday and tuesday. only thing is mine might look better than yours with 17's on and remember, i still have the SUNROOF... whahaha...

edit: i never will spend the amount of money you did on lighting though, you have me there...

[grncivicdhr]

mynismo, what kind of wheels are thos and do they come in a bronze finish?

[mynismo]

17" adr concept pro wheels
225/45/17 eagle f1 gs-d3 tires

buy the wheels here http://www.groupbuycenter.com/buy.aspx?id=10461
i bought the tires at conrads after doing some comparison at http://www.tirerack.com

[old_s13]

Originally posted by mynismo
btw mike, i dont know what it is about it, but my car will soon look almost exactly like yours with the exception of the 180sx lights. im getting my spoiler ripped off and hatch repainted monday and tuesday. only thing is mine might look better than yours with 17's on and remember, i still have the SUNROOF... whahaha...

edit: i never will spend the amount of money you did on lighting though, you have me there...

Mark, your car is THE BEST.

[mynismo]

Originally posted by old_s13


Mark, your car is THE BEST.

why thank you....:spam:

[flylwsi]

moving your battery won't make that much difference?

if you put a battery in the cabin, you need a battery box for it anyways.

and most are sealed and vented to the exterior.
i've got an optima, so it's no biggie.

they weigh almost 40 lbs so, yeah, it's a big difference.

Technically you want the softest suspension setting and lowest tire pressure you can possibly have while staying within the limits of the course to keep the car from bottoming out, flexing etc...

i'm going to look at you funny until you prove that.

track cars have soft suspension and low tire pressures?

come on now.

[old_s13]

Originally posted by flylwsi
moving your battery won't make that much difference?

if you put a battery in the cabin, you need a battery box for it anyways.

and most are sealed and vented to the exterior.
i've got an optima, so it's no biggie.

they weigh almost 40 lbs so, yeah, it's a big difference.



i'm going to look at you funny until you prove that.

track cars have soft suspension and low tire pressures?

come on now.

hey fucker, dont quote OTHER people as ME.. I never said track cars need LOW tire pressure..!

As for the battery thing, I dont think its THAT big of a deal.. people slap in subwoofers and tons of other crap in their street cars, a fucking battery isnt the end of the world. If you are serious about being light and racing, you WONT have a subwoofer.. let alone a 40lb battery. You know many RX7 owners use those super small super light batteries.. ever considered downsizing?

If people used less bullshit accessories like crazy stereos, lame foglights that draw tons of current.. then maybe they'de be able to use such batteries. Instead, people put all these stupid accessories, flip tv screens, and other bling bling shit.. then they thing their car is SHOW *AND* GO.. yeah, whatever.. fuckin POSEURS

nah.. fuck poseurs.. FUCK POSEURS$?!@$%!@?$!@ You guys got me pissed this morning.. fuckin all this talk about bandwagon SR bastards and putting batteries in the back, maxing up the tire pressure..

all of you need to shuttup.. before i go psycho and fuckin kill someone, damnit.. ?$RE#!%@#?%@#?%?$#^?$%&

[flylwsi]

hey mike...

i didn't quote you... geez.

my point is that if you want to balance, move the battery.. it takes the weight off the front, where the imbalance naturally is, and moves your balance closer to 50/50.

that was my point...

as for soft suspensions and low tire pressure...

that wasn't quoted from you either. . .

fucker. :licker: