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View Full Version : Weighed & balanced my S13...



Beef
08-08-2004, 02:43 PM
Thought some of you guys might like to see this.

http://www.streetkaizo.com/Pics/UpFrontTechnologies/Weight1.jpg

http://www.streetkaizo.com/Pics/UpFrontTechnologies/Weight2.jpg

http://www.streetkaizo.com/Pics/UpFrontTechnologies/UFT.jpg

http://www.streetkaizo.com/Pics/UpFrontTechnologies/UFT%20(10).jpg

The info pretty much speaks for itself. I was pretty happy with how balanced the car was given this was how I set it up. We did a quick session on the scales so there was not much done for adjustments - and honestly there's not much that needs to be done.

Some info that affects the numbers:
1993 240sx coupe SE
SR20det
Sunroof (possibly ditching this winter)
No carpet, sound deadening or rear interior
Two OEM front seats and door panels
Full dash, no A/C or interior condensor
4pt AutoPower rollbar
S14 seatbelts
17x8.5 wheels (roughly 23lbs each I think)
Pass side trunk mounted Odyssey gel cell battery
No front bumper support, the rear is on though.

That's about it...

BlackBomber
08-08-2004, 04:03 PM
nice dude. I wish they had a place like that around north florida. Couple of questions for you....

I have the very base model 93 coupe. no power anything, no sunroof, nothing. How much more do you think the SE weighed. I do have air conditioning and sr20. I'm running on the stock steelies. No bodykit or anything, no bumber support. full-interior.

what do you think it weighs?

P.S. My 89 HB SE with sunroof, power everything, stock alloys and sr weighed 2620. It had a stripped interior.

carluch
08-08-2004, 04:10 PM
how much do you weigh and how much fuel did you have at the time?

Beef
08-08-2004, 04:37 PM
how much do you weigh and how much fuel did you have at the time?



How did I forget that? The fuel gauge was just about exactly on one half of a tank of gas.

My weight can be subtracted from the two listed, but I'm around 180lbs...



I have the very base model 93 coupe. no power anything, no sunroof, nothing. How much more do you think the SE weighed. I do have air conditioning and sr20. I'm running on the stock steelies. No bodykit or anything, no bumber support. full-interior.



Given the have and have nots compared to mine, I would imagine that it's not too far from what mine weighed in at. I wouldn't even want to begin to guess at specific weights.

digitalpimp
08-08-2004, 05:45 PM
look at this.... i cut keith a deal and he dosn't even give a plug for the shop i work at....

his car was corner weighted at up front technologies in MN. for anybody in the area it's 75 to get thrown on the scales and make a adjustment or two. we also measured the ride hight, camber and caster of the car. a full corner weight/allignment would cost more. anybody who's intrested can reach me at nickshamla@hotmail.com

my race spl (cheap race spl to be more specific) weighed 100lbs less than keith's car, most of which i'm assuming is due to the cage in keith's car. another thing of note is that moving the battery to the passenger side of the trunk is HUGE.

Kim_Jong_Il
08-08-2004, 06:28 PM
you might want to remove the ad from your post, that can be considered commercial...

Beef
08-08-2004, 08:29 PM
you might want to remove the ad from your post, that can be considered commercial...



I don't know how many times I've seen you post with moderator wannabe replies, but why don't you let the people that are actually in charge of that take care of it. You're the only person posting here that needs moderating since your reply is 100% off topic.

Nick - I didn't mention where since we all know MN has like three 240 owners that would bother doing this - and they already know. http://forums.freshalloy.com/images/graemlins/grin.gif

digitalpimp
08-08-2004, 11:00 PM
Nick - I didn't mention where since we all know MN has like three 240 owners that would bother doing this - and they already know. http://forums.freshalloy.com/images/graemlins/grin.gif


no need to remind me. i'm just wondering who the third is http://forums.freshalloy.com/images/graemlins/laugh.gif

1fly
08-09-2004, 08:36 PM
I'll take third http://forums.freshalloy.com/images/graemlins/cool.gif Yes, I knew about it http://forums.freshalloy.com/images/graemlins/laugh.gif Only if the car would run right I'd be there...

Nice post... oh & btw, I thought Beef's battery was on the pass. side???

1fly
08-09-2004, 08:37 PM
oh yes, and when do we get to run the 'ring? http://forums.freshalloy.com/images/graemlins/shocked.gif

digitalpimp
08-09-2004, 09:43 PM
keith's battery is on the passenger side. i really can't wait to start using the full potential of the scales (center of gravity and such). we were thinking that moving the engine 2" back and as low as possiable would make the car handle like a go cart http://forums.freshalloy.com/images/graemlins/cool.gif

i also can't wait to gather more info on the weight differences between hatch and coupe

Kim_Jong_Il
08-09-2004, 09:45 PM
its a community forum and partially up to the members to point things out to others. If you have a problem with that you go take it up with a mod.

hurleyboi514
08-10-2004, 08:06 PM
ive got my weight #'s next to me....

total: 2596 with a full tank of gas (so 2,500 lbs with out gas)

LF: 693 RF: 672
LR: 597 RR: 634

pretty good weight balance. the thing that threw off the RR is the battery right over the RR wheel well. that was on RSR's, and AGX's...

digitalpimp
08-10-2004, 10:55 PM
that's w/o the driver i'm assuming? the driver tends to make a big difference, and is usually part of the car when it's moving http://forums.freshalloy.com/images/graemlins/wink.gif

hurleyboi514
08-11-2004, 03:17 PM
yah, its with out driver. the car had no height adjustment so i didnt bother to get one with driver and such...

EggMan
08-11-2004, 04:02 PM
look at this.... i cut keith a deal and he dosn't even give a plug for the shop i work at....

his car was corner weighted at up front technologies in MN. for anybody in the area it's 75 to get thrown on the scales and make a adjustment or two. we also measured the ride hight, camber and caster of the car. a full corner weight/allignment would cost more. anybody who's intrested can reach me at nickshamla@hotmail.com

my race spl (cheap race spl to be more specific) weighed 100lbs less than keith's car, most of which i'm assuming is due to the cage in keith's car. another thing of note is that moving the battery to the passenger side of the trunk is HUGE.



dayam... i really wonder how much my car weighs now... but I am broke.... i would think mine would be a nice bit lighter than yours.

KSU_S13Less
08-11-2004, 07:38 PM
It's nice to know are cars have great weight distribution.

Wiisass
08-11-2004, 09:35 PM
I can't remember the exact distributions from the last time i weighed my car, but I do remember the fronts were 10 pounds apart, but the rears were 100 pounds off. This was with the battery on the passenger side where the back seat used to be and stock suspension. And front/rear distrubition was 53/47. All of this was with me in the car. Total weight was 2700, so the car weighed a little under 2500 without me. I think I had about a quarter tank of gas when I did this too, which reminds me that the passenger rear was the heavier side.

Once I put my coilovers on and put my whole car back together I'm going to do it again. And hopefully get it within 1% of perfect balance.

I haven't decided what to do about the gas situation. I think I might shoot for either a half tank or a quarter tank to balance it. If I have the time, maybe after I'll fill it up and weigh the car at intervals to see how much stuff changes are you use gas. Anyone have any opinions on this? It would be interesting to see the shift in weight and CG with different amounts of gas in there. Maybe if I stop being lazy I'll do this.

Tim

orion
08-11-2004, 09:42 PM
...maybe after I'll fill it up and weigh the car at intervals to see how much stuff changes are you use gas. Anyone have any opinions on this?



How about you go in on empty, and add gas a couple gallons at a time while on the scales...all it would take is 2 10gallon gas jugs.

Then you can see exactly what happens if you add six gallons before a HPDE...or whatever.

- Brian

rednerd
08-11-2004, 10:11 PM
I used to try launching my car at the track with different amounts of fuel to see if there was any difference (traction vs. et..). I always wondered about how much gasoline weighed but never really cared enough to actually look it up. Well, I finally got off my arse.

It turns out that according to google and the Interweb that the weight of fuel varies greatly depending on temperature, additives and especially octane! Higher octane = more weight according to one post, who knew.

Anyways it looks like gasoline generally weighs ~ 6 - 6.5 lbs/gallon. Probably more like 6.3 lbs / gallon.

I wonder how much 110 octane leaded race gas weighs?

_Def_
08-12-2004, 12:49 AM
I used to try launching my car at the track with different amounts of fuel to see if there was any difference (traction vs. et..). I always wondered about how much gasoline weighed but never really cared enough to actually look it up. Well, I finally got off my arse.

It turns out that according to google and the Interweb that the weight of fuel varies greatly depending on temperature, additives and especially octane! Higher octane = more weight according to one post, who knew.

Anyways it looks like gasoline generally weighs ~ 6 - 6.5 lbs/gallon. Probably more like 6.3 lbs / gallon.

I wonder how much 110 octane leaded race gas weighs?



Most gas you put in your car is within a few tenths of a lb per gallon. I think AvGas is slightly lighter, but still in the high 5's/gal.

Beef
08-12-2004, 10:35 AM
I used 1/2 a tank as that is the most common level mine is at while it's on the track. It's also going to give me the least variance if the tank is full or empty.

digitalpimp
08-12-2004, 12:37 PM
my car was at 2530 lbs w/o me, and nearly a full tank of gas. back when i didn't have a lsd and good tires i would autox with a full tank of gas. and since i've always raced with a full tank (what a bad habbit eh?) i guess i've always wanted as much weight in the back as possiable and didn't want to run into any fuel starving problems, or sucking up any of the grime at the bottom of the tank.

Thx247
08-12-2004, 10:23 PM
1993 240sx hatchback, base model, no rear interior after driver seat. Azenis on steel wheels. 40psi front, 39psi rear. 180lb driver, 5 gallons of gas.

826lb front left, 777lb front right
645lb rear left, 597lb rear right

Cross 1422lb 50.0%
Left 1471 51.7%
Rear 1242 43.7%

Total 2845lb with driver, 2665lb without driver.

With these numbers you can easily see how much I could benifit from a diet, moving the battery to the rear of the car, losing the AC and dumping the heater core and blower units.

Thx247
08-12-2004, 10:26 PM
btw beef, why is the cage padded like that? No one sits back there right?

shoes59
08-13-2004, 06:31 AM
I'm confused (no surprise as I'm having many senior moments these days http://forums.freshalloy.com/images/graemlins/smirk.gif) There are two charts showing different weight balances yet the information listed at the top of each sheet is the same. Was the first one the final result after making adjustments?

asad
08-13-2004, 07:14 AM
I'm confused (no surprise as I'm having many senior moments these days http://forums.freshalloy.com/images/graemlins/smirk.gif)



Look closer, Jim -- one is with driver, one is without.

Asad