light weight wheels

 

All of you guys are being way optimistic. 160 to the pavment is way to much along with the %s for your mods. With a good exhaust, cai, and the pulley you shouldnt be making more than 140whp... i think the 190 for the lotus is also in whp. A good turbo kit running at 6.5psi should make about 185whp. So doing an N/A setup 190whp isnt an easy or cheap goal. Escpecialy with lack of parts.


If you took out the dash, all the of stereo (h/u, speakers..), spare tire, took out the passanger seat (40lbs), replaced the driver seat with a 10lbs one, took off all the door panels, the headliner, the back seat (which probably weights 20lbs), all the sound deadening, carbon fibre hood (drops about 30-40lbs), light weight wheels(if you were racing.. you'd go up in size though, but you could drop 10lbs each.. but if you get performance tires the weights about the same as overall stock), carpet, replace stock intake (thats a good amount of weight), replaced exhaust... ect. You may be able to loose 800pound.. Its not an easy thing to do. Im going to try to get a weight of my car soon. w/o back seat... w/o subs. My wheel weight a tiny bit more than stock (cuz the tires), my seats are only a little lighter).


Remember you only need 6qts of oil, not 10. I would imagine a different gas tank would get alot of weight off.. im sure the tank weights alot. And a full tank of gas is approx 120lbs.


200 lbs is easy to lose.. but once you start going over that it gets expensive and you have to sacrafic things.

 

Man I sure did start a good topic, lol.

I know our cars not for the drag strip, but for twisty and turny roads or track racing. That is why I pick out the Elise becuase it is the closest "sports" car our cars (as far as weight, speed, and size) comes to.

On the weight deduction thing, you can remove a good amount of weight if you just gutted the back doors and seal them shut (and removing the door handles) and put in plex glass. I would guess each doors lock weight about 10lbs becuase we have "power" locks on our cars (even tho it can only be activated by the driver door lock).

And I agree if we make the car to light it will have stablity issuses, but I don't think it would be that hard to make front strut bars for our cars. I know we are lucky with McPerson supusion in the front and a semi indepent one in the back of the car. I don't know how hard nor how much it would be to convert the back supusion to McPerson. That should help the car be more stable. Or we can use BMW's supusion and brakeing technology.

 

Originally posted by dog@Aug 28 2005, 12:56 PM
126hp + 22hp(pulley) =148hp + 22hp (15% of 148 from catback)= 170hp + 34hp (20% of 170 from a long ram)= 204hp those are conservitive estimates of hp gain from these mods. Plus I am not picking up any engine bay heat threw the filter and the position of the filter and shroud to the vent I am gaining positive boost.
[attachmentid=561] note the sheet metal splash sheild which I have turned so the air coming in the small bumpervent hits the inside of the shield funneling it into the filter. Faster I go the harder the push, plus I have cut the inside end of the vent so the diameter of the hole is about 1" larger than stock.

If you care to be more conservitive add it this way.

126+22(pulley)=148 with the pulley we will use this minus 5hp as the base line to figure the % from the exhaust and intake

exhaust 15%= 21.45hp

long ram in bumper 20%= 28.6 hp

143+21.45+28.6= 193.5hp

With the car sitting still there is no boost from a ram air but the hp rating is at 5600 rpm which would be 37mph 1st gear 66mph 2nd gear and 105 3rd gear Ihave never seen 5600 rpm in 4th gear. At 105mph taking into account the positive boost to the filter I may be making well over 200hp at the crank.

I feel very safe with my estimate of atleast 160 at the wheels.

If my math is wrong please show me where.

Quoted post​

Your math is right.. but 15% from an exhaust isnt. 10hp from the exhaust at the most. Actually.. i have dyno proof i just dug up. Chris made 3-4whp throughout the powerband on his mandrel bent 2.5inch stailess steal exhaust. With that exhaust, the UD pulley, and an SRI hes making 123whp(approx. 145at the crank)... stock his car made 101whp (roughly 125at the crank).


Even 22whp with those mods is ALOT.. not to mention a much smoother power band. Even i was wayy optimistic.





Oh yes i forgot about the windows.. thats alot of weight. As dog said the power window motors are about 15pounds each.. including that in most cars you can gut 40-50pounds per door. Thats 160-200pounds.. plus if you replace all the windows with lexan thats nearly 200pounds. I guess it is closer than i thought. But who wants lexan windows on a street driven car?

If you want a nice car.. but want to lose weight i say you could lose 300pounds w/o sacraficing anything and 200pounds w/o spending much money. Lightweight seats are very expensive as are lightweight wheels. A carbon hood would lose more weight than one seat and cost half as much. Anyways im trying to get the weight of my car before i put the turbo on it so i hopfully will know soon.