Weight

[Bansheewild88]

OKay i have been doing alot of research on how weight effects hp. I know this topic has probably come up somewhere many of times so im sorry if its repeating itself. Im trying to lose maximum weight. I know for every 100 pounds i get about 10 hp. and every pound off the crank i get about 2.7 hp. I also know that the drivers seat weighs approximately 65 pounds and the passenger seat is approximately 45 pounds. well i was wondering how much weight is the stock flywheel and stock crank pulley and the rear seats. Sorry for the bothersome questions but just wondering. Thanks

[youngvr4]

rear seats are light

not sure about he rest

[Igovert500]

Rear seats 10-15lbs....REALLY light

Stock TT flywheel 20-25lbs I think

stock crank pulley 6-7lbs

I think 3sx has the exact weights on their pages and you can compare them to the aftermarket weights

[Stealthee]

100lbs doesnt equal 10hp. 100lbs knocks 1 tenth off you quarter though. The stock crank pulley is something like 8 lbs. The stock flywheel is in the range of 45lbs (not 100% sure but thats my best guess). The lightweight crank pulley will actually benefit you more than the flywheel so your numbers dont add up. If every lb off the crank = 2.7 hp then a flywheel would get you 40+hp and a pulley would get you 15+hp. That aint happening. The pulley usually gets guys 5-10 hp. The flywheel alot of times doesnt gain any hp to the wheels.

As for other weights power leather drivers seat is 70lbs. The leather non power leather seat is around 60lbs. Theres no way it wonly weighs 45 because my stock cloth non power seats are 50lbs each. The rear seats are a grand total of about 15 lbs including the seat backs and bottom. Dont just go removing stuff thinking its going to make you super faster. If you want real power just up it and go with a TT conversion. These cars arent lightweight and werent meant to be lightweight like a Civic or Teg were.

[Morphius289]

Don't take the back seats out. Trust me, they're light enough, and the car will look like crap without them in.

[Igovert500]

Unless you do this:

http://www.vr4stealth.com/sully_two_seater.htm

[2old]

Actually Stealthee, the stock flywheel is about 20ish pounds... But so is the pressure plate... So 40 or so pounds would be the total rotating mass.

The math on rotating mass actually does match up because the torque required to speed up the flywheel from 1000-7000 in the first 1-2 seconds is about 40 HP.

But this only applies to 1st gear where the change in RPM is fairly quick. You get diminishing returns the higher your gear (2nd is like 10-15 HP, 3rd 2-5, etc...).

The problem is that the reverse is true as well... You rev up the 7000 rpm and dump the clutch you "gain" more then that HP back depending on how quickly the flywheel ends up matching the clutch plate speed.

Why autocrossing people like lightweight flywheels and drag racers like stock...

[Bansheewild88]

The numbers that i put up there were from other sites that i got the info from. so i was like wow 100 pounds= 10 pounds but i always heard that it was 2.7 hp for every pound off the crank. but im planning on getting a light weight flywheel and the 3sx performance crank pulley for hp gain. and then im trading out front seats for lighter ones. i just want to make my car lighter because im going to be adding things so i want to go as light as possible i knwo they werent made to be light but i figure if i can get them lighter it might ad some speed like if there is 2 people in the car compared to 3 or 4 people in the car u know. but im not trying to make it into a rice car or anything i want it just for pure speed. i was thinking about the conversion kit of tt but im more interested in just getting a ripp mods super charger.

[VR43000GT]

I've heard they are still working out the kinks in the SC so you may want to wait.

[Stealthee]

Not only that but the supercharger would end up costing alot more than a TT conversion and your power potential is limited with the supercharger set up.

[2old]

Are you just trying to get rid of weight cheap or what would be the most effective places to get rid of weight?

If you are looking for the most effective place you should look into 16" forged aluminum wheels (I assume you are N/A given you are looking at a supercharger). It looks a little getto with only 16" wheels but it centralizes the rotating mass which enables more torque to reach the ground.

[Bansheewild88]

yeah im just trying to lose weight and i was planning on going down to lighter aluminum wheels then i already had. yeah see i heard that if i do a tt conversion i would have to change the pistons for a different compression ratio and i really dont want to go throught that trouble it would be cheaper and i knwo they basically bolt right up. i also heard i would have to change my transmission to 6 speed because of the torque. i figured that would happen anyway with the super charger. what would yall recommend. me doing tt conversion or super charger. Im deffinetly going to lose as much weight as i can just because i want it to be lighter.

[Igovert500]

Um, there are quite a few who run 10:1 compression and auto NA trannies with the TT conversion. You need a tranny cooler, and LSD and a shift kit aren't bad ideas. As far as the compression, tuning needs to be taken more seriously, because the room for error is less. But it can still be done effectively and safely...just look at Hotshot's old setup (now he's down to 8.5:1) but he ran with SL pistons for quite some time safely.

Which to go with is really a personal choice, and I suggest you research them both more in depth before you decide.