Auto-x Street Mod minimum weight question

[dropkickmuppet]

based on what i've already done to my 240, it looks like i'm going to be running Street Mod next season. as such, i have a couple of questions on the minimum weight rule.

1. has anyone actually managed to get the car weight down to 2400lbs? if so, how?

2. i assume that the 2400lb minimum is without the driver, correct?

3. how accurate is nissan's quoted 2730lb curb weight? i haven't had the change to get my car on a scale.

[North240]

s13/14?
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[dropkickmuppet]

'92 S13, base model. no sunroof, no hicas, no abs other than my foot.

[Flybert]

This is the best thread in terms of discussing weight savings on s13's.

http://forums.freshalloy.com/ubbthreads/showflat.php?Cat=&Board=UBB9&Number=67527818&page=&view=&sb=5&o=&fpart=1&vc=1

That thread also has a link to a badass list of weights for stuff inside s13's.

http://www.mysportscar.com/features/project240/weightsavings/index.htm

And remember this, coupes are lighter.

[019]

i think you could probably get close if you took out all the sound deadening in the firewall and the floor, emissions crap, and ac. 2fass240us on FA has made a comprehensive list of weight savings in his s13.
http://www.mysportscar.com/features/project240/weightsavings/index.htm

[Cr0usEEE]

i think you could probably get close if you took out all the sound deadening in the firewall and the floor, emissions crap, and ac. 2fass240us on FA has made a comprehensive list of weight savings in his s13.
http://www.mysportscar.com/features/project240/weightsavings/index.htm

techincally you cant pull the sound deadening. can pull the rear seats but the interior must remain stockish

[dropkickmuppet]

yeah, the mysportscar.com link was something i'd found already. helpful, but they pulled out a lot of things that either a) i'm not willing to go without (i.e. power steering) or b) is illegal in Street Mod.

if Cr0usEEE is right about the sound deadening, i may wind up running in Street Preparted...damn. then again, the z32 uprights probably would have done it too. well, i guess if thats the case i don't have to worry about a minimum weight.

[24Zero]

My buddy autocrossed his today. He has a 1990 SE. His weights 2467. He has done a CA swap which looses about 40-50lb - I think. He lost over 100lbs by removing his A/C. He also lost 40+ by removing his rear seat, and most of his interior pieces plus the weight of the spare.

[nlzmo400r]

My buddy autocrossed his today. He has a 1990 SE. His weights 2467. He has done a CA swap which looses about 40-50lb - I think. He lost over 100lbs by removing his A/C. He also lost 40+ by removing his rear seat, and most of his interior pieces plus the weight of the spare.

1- a/c doesnt weigh over 100lbs, its closer to 50-60lbs
2- your rear seat doesnt weigh 4olbs, it weighs 15-20.

CA doesnt weigh any less than a KA does. Its iron block just like the KA, and has a turbo strapped to it. Knowing that the SR is about 5lbs lighter than the ka (aluminum), id be willing to be the CA is heavier than the KA with the turbo strapped to it.

[dropkickmuppet]

i'm planning on pulling the a/c, but according to the guys on mysportscar.com, its only about a 30lb weight loss. i'm definitely going with a lighter battery that i'll probably relocate to help with weight distribution, and may look into a FRP hood. the stock hood has to weight at least 40lbs, and its situated pretty high on the chassis. a lexan rear window would really help too, since i've got a hatchback.

[stillmatic]

http://www.zilvia.net/f/showthread.php?t=39992

[dropkickmuppet]

damn, a 240 weighing just over 2000lbs with an SR20 is pushing lotus elise territory....

i'm going to have to go hit those scales in San Jose.

[HaLo]

mine hit the scale at 2888lbs at my last national tour...
it still has hicas and added a roll cage
SR20DET
minus A/C, rear seat, chromoly sway bars...
i think 26xx is doable... but 2400lbs is pushing it.. ALOT. (need tons of $$$)

[stealthx32]

Yeah, you're not hitting 2400 lbs w/o cheating.

[jmauld]

mine hit the scale at 2888lbs at my last national tour...
it still has hicas and added a roll cage
SR20DET
minus A/C, rear seat, chromoly sway bars...
i think 26xx is doable... but 2400lbs is pushing it.. ALOT. (need tons of $$$)

I thought the S13s were lighter than that? I weighed my completely stock S14 SE and it came in at 2828. Were you in the car when it was weighed? I haven't weighed since I've done my weight reduction, but from the weights of stuff that I removed, I should be in the mid to high 2600lb range.

[HaLo]

Street mod rules aren't very flexible on lightweight adjustments... AceInHole's car weighed at 2816 or something close to that...

[jmauld]

Street mod rules aren't very flexible on lightweight adjustments... AceInHole's car weighed at 2816 or something close to that...

You can still use SP rules to reduce weight. Turn your hicas car into a base model in terms of options.

Did you ever weigh the front chromoly swaybar and compare it to stock?

[HaLo]

yup
both sway bars are lighter than stock..
i will get rid of the hicas too..

[MovinUp-1]

My S13 w/ SR20det, 6 point bar, no backseat, no a/c wighed 2770 with an almost full tank. I do have a 12lb battery and very light 3 piece wheels. The street mod weights are ridiculously low imo. I don't think a 240 can get to 2400 with all of the glass, interior pieces, sound deadening, etc. You can lose a lot of wieght with high priced wheels. The front seats are heavy too. A fiberglass hood could lose a few pounds too.

Now if I could run with 5 gallons of gas instead of 15 that would be 70lbs right there. Let's say I could lose 25 from each seat with race seats and aluminum brackets. Lose maybe 20lbs with a fiberglass hood. That's 2640lbs. Where's the other 240lbs gonna come from?

[jmauld]

Okay, I found my spreadsheet of where I've been weighing parts. All of these are from a 1995 240sx SE with most options except sunroof.

If you add it up, you should be able to take out about 200lbs. Note some of these things are out there in terms of weight saved vs effort, but he asked. :)

Weight Savings - Description
32lbs - Replaced entire factory exhaust with aftermarket stuff. Factory: 66; aftermarket: 34
3lbs - Replaced rear speakers with much smaller speakers
2lbs - Removed factory amps
12lbs - Smaller Battery
2lbs - Non-powered antenna vs powered antenna
4lbs - Remove Foglights and associated Relay and crap
38lbs - Spare tire, jack and tools
2lbs - Aftermarket intake vs. Stock
8lbs - Remove clutch fan
4lbs - Lightweight Pullies
10lbs - Lightweight Flywheel
20lbs - Lightweight rims
2lbs - Remove spare "alarm" horn and associated alarm bits
9lbs - Remove Rear sway bar (used springs to tune balance
5lbs - Remove tow hooks
8lbs - factory springs to coilovers
3lbs - Cruise Control pieces
4lbs - floor mats

168lbs - Total removed

Below are additional things that can be removed in SM

AC crap
C.F. hood
Aluminum driveshaft
Chromoly Front Swaybar
Additional Emissions stuff
Race Seats
Rear Seats
Rear Spoiler
Any Ground Effects
Aftermarket Control arms vs factory arms???
Aluminum Camber Plates vs strut tower bushings


There's got to be more that I'm leaving out?

[nightwalker]

aside from the gutting of the car, you can replace components with lighter aftermarket ones. Such as the obvious carbon hood and hatch. But quality race seats such as Sparco, Bride, etc. weight half of factory seats. Tubular headers, exhaust systems, flywheels, and driveshafts are also ways to reduce weight. Chromoly suspension arms such as the ones from SPL parts also weigh a lot less than factory components. A S15 subframe can also help you lose weight too. Just think creatively.

[HaLo]

Don't forget about street mod rules: you can't replace glass to lexan...

I know i do the following on mine:

- Remove Hicas by replacing rear subframe: 50lbs?
- change optima battery to 13lbs battery: 30lbs
- shave front part of the cage, only to keep roll bar: 70lbs?
- aftermarket hood and front bumper: 20lbs?
- suspension components: 20lbs?
we're close to 200lbs, makes me at 2688lbs.. nowhere near 2400lbs...

[Rennen]

My S13 w/ SR20det, 6 point bar, no backseat, no a/c wighed 2770 with an almost full tank. I do have a 12lb battery and very light 3 piece wheels. The street mod weights are ridiculously low imo. I don't think a 240 can get to 2400 with all of the glass, interior pieces, sound deadening, etc. You can lose a lot of wieght with high priced wheels. The front seats are heavy too. A fiberglass hood could lose a few pounds too.

Now if I could run with 5 gallons of gas instead of 15 that would be 70lbs right there. Let's say I could lose 25 from each seat with race seats and aluminum brackets. Lose maybe 20lbs with a fiberglass hood. That's 2640lbs. Where's the other 240lbs gonna come from?


These weights seem right on.

An ITA 240SX I crew for just weighed in this weekend 2642 lbs post race... slightly over 2700 with a full tank before the race. This is '90 hatch with ALL interior gone except for a dash, lightweight aluminum seat, full cage, no AC/Emissions crap, short straight pipe, light 15x7 wheels, etc.


... so you really don't ever have to worry about the minimum weight for Street Mod within the rules.

-Matt

[lilredstiffy]

Okay, I found my spreadsheet of where I've been weighing parts. All of these are from a 1995 240sx SE with most options except sunroof.

If you add it up, you should be able to take out about 200lbs. Note some of these things are out there in terms of weight saved vs effort, but he asked. :)

Weight Savings - Description
32lbs - Replaced entire factory exhaust with aftermarket stuff. Factory: 66; aftermarket: 34
3lbs - Replaced rear speakers with much smaller speakers
2lbs - Removed factory amps
12lbs - Smaller Battery
2lbs - Non-powered antenna vs powered antenna
4lbs - Remove Foglights and associated Relay and crap
38lbs - Spare tire, jack and tools
2lbs - Aftermarket intake vs. Stock
8lbs - Remove clutch fan
4lbs - Lightweight Pullies
10lbs - Lightweight Flywheel
20lbs - Lightweight rims
2lbs - Remove spare "alarm" horn and associated alarm bits
9lbs - Remove Rear sway bar (used springs to tune balance
5lbs - Remove tow hooks
8lbs - factory springs to coilovers
3lbs - Cruise Control pieces
4lbs - floor mats

168lbs - Total removed
There's got to be more that I'm leaving out?

No offense meant but those weights are insanely off
9lb sway bar? 5lb tow hooks? 4lb floor mats? 8lb clutch fan?

[jmauld]

No offense meant but those weights are insanely off
9lb sway bar? 5lb tow hooks? 4lb floor mats? 8lb clutch fan?

When I listed the weight, it includes everything. ie. tow hooks = all three tow hooks. Floor mat(S) = all 4 mats. clutch fan = fan assembly, clutch, and shroud. Sway bar includes the bar, the mounts and endlinks.

[Flybert]

Don't forget about street mod rules: you can't replace glass to lexan...

I know i do the following on mine:

- Remove Hicas by replacing rear subframe: 50lbs?
- change optima battery to 13lbs battery: 30lbs
- shave front part of the cage, only to keep roll bar: 70lbs?
- aftermarket hood and front bumper: 20lbs?
- suspension components: 20lbs?
we're close to 200lbs, makes me at 2688lbs.. nowhere near 2400lbs...

Less fuel 60lbs
base model coupe with no sunroof or power 100lbs
no headlight motors 5lbs
no bumper supporst 40lbs
fiberglass passenger seat 15lbs
fiberglass hood and bumper will get you about 10lbs more than what you think

This would put you at 2458. I know someone who had a s13 silvia with a cusco chromoly 6 point cage in the 2400's.

[HaLo]

Less fuel 60lbs
base model coupe with no sunroof or power 100lbs
no headlight motors 5lbs
no bumper supporst 40lbs
fiberglass passenger seat 15lbs
fiberglass hood and bumper will get you about 10lbs more than what you think

This would put you at 2458. I know someone who had a s13 silvia with a cusco chromoly 6 point cage in the 2400's.

- Less fuel than 3/16 of a tank? (that's what I had at the weight-in)?
- base model coupe -> you mean, sell my car and start over?
- headlight motor removal = illegal
- bumper supports removal = illegal

I agree on the rest.. I still believe 26xx is doable, but touching 25xx is going to be very expensive, not to say the least. (WITHIN SM rules)

[Flybert]

- Less fuel than 3/16 of a tank? (that's what I had at the weight-in)?
- base model coupe -> you mean, sell my car and start over?
- headlight motor removal = illegal
- bumper supports removal = illegal

I agree on the rest.. I still believe 26xx is doable, but touching 25xx is going to be very expensive, not to say the least. (WITHIN SM rules)

Yeah man, base model coupe is the only way to get the weight down. It has a stiffer chassis as well. Rock it with a 1.25" diameter thin wall chromoly cage for some extra stiffness and to keep the weight down. Rewiring the car can shave a lot of weight as well. As for the headlight motor and bumper supports, who says you can't try and bend the rules? AHAHHA, it's not like you have the best platform out there. If F1 guys can try and bend the rules by hiding fuel cells, why can't you? AHAHAHAHAH Just think of it as evening out the field. JK...or am I?

[North240]

I weighed in with my s14 at 2920 with a 1/2 tank and spare tire/tools in the back + the KAT setup. This was also with stock wheels, so the new ones are even heavier. Kinda nuts that AceinHoles base model was only 100lbs lighter then my SE w/ sunroof and all parts still in it.

Was that with or without the mustang wheels and r comps?