Just farting around, anyone know what a 1/4 mile time would be if a given car was 700 lbs. lighter? What I mean is, all things being equal, a car that runs 14.2 @ 96 mph, will run about xx.x @ xx when it is 700 lbs lighter.

Any ideas?

 

prolly a lot faster....


but how do you drop 700lbs from a car?

 

Take the engine out and push...

 

13.5

every 100lbs is approx. 1/10 sec

 

I thought about that

Take my motor from my 99 Si with stereo, etc. and put it into a 92 Civic CX hatchback, stripped of course

 

There is a lot that will play into the time. Temp, susp'n, tires, track cond. Should be a monster, though.

good luck

 

Yup.

 

While yes, that works for 100 or 200 lbs. I some how doubt that it's a linear relationship. Figure if you're in a '92 CX, with a base weight of right at 2000 lbs. You throw in a stock GSR engine at 170 hp. That's good for some low 14's. Now if you take out 100 lbs at 1900, sure you'll knock off a .1 or so. But if you take the car down to 1300 lbs... it better be a hell of a lot faster than low 13's...

 

My thoughts exactly. The 1/10 second time is a good rule of thumb for estimating times. The best way to find out is to take it to a drag strip and run it.

 

Yea, and a 92 CX with 200+ to the wheels should be better than 13.5...shouldn't it?

 

I don't know why you only got a 14.3 with 200+ hp and a 2600lb civic. You should have easliy been in the 13's like that. My R with only an AEM ran a 14.3, and I am not the best drag racer in the world. I was putting down ~172whp at the time.

Did you ever verify your dyno #'s on another dyno?

 

Yes, backed up dyno a couple of times. Your completely right, I should have been around 13.8 or so with my whp and weight. I'm not sure what it is, lack of experience, ATS final drive, car may have been running bad. When I get everything together, I'll re-dyno at a local dyno (not DPE where I usually go) and run the 1/4 again.


[Modified by TodaSi, 2:58 PM 5/9/2002]

 

I doubt it's linear. Maybe you could figure it out by getting some % numbers. I doubt that a 4500 lb car that runs 14.2 would be just as fast after a 700 lb weight loss as a 2300 lb car that runs 14.2 before the 700 lb loss.

Edit: I just realized that 3 or 4 other people said the same thing


[Modified by SoCal ITR, 1:38 PM 5/9/2002]

 

700 lbs is a lot of weight, you would probably drop more than 7 tenths. Now whether you can do that in real life is a different story.

 

It's closer to 50lbs = .10 off when you get that light.

Easy 12s!

 

Chad can't drive!

So its now in a hatchback. Damn I hope you like the view of SE-R front ends in the distance of your rear-view mirror cause thats where I'm gonna be June 24th!!!

 

Any horsepower/quarter mile calculator I have seen would deduct 0.1 for every 60lbs or so in the ITS weight range. 700lbs should be more than a second.

 

This isn't quite true. Assume that 0.1 sec is trimmed from the 1/4 mile time with the first 100 lbs. As more and more 100 lbs increments are deleted from the car, the percentage difference from the before and after weight increases. Therefore, each successive removal of 100 lbs will make the car drop more than 0.1 sec from the 1/4 time than the 100 lbs taken out before it. Just think about changing the HP/wt ratio. This is of course a generallity as Bryan mentioned many other factors come into play and those factors will become more and more important as the weight becomes less and less.


[Modified by Jon7, 6:38 PM 5/9/2002]

 

Oh no, it's gefiltefish!
Yea, I'll be able to see you in the rear view for a little while....then I'll begin seeing you through the windshield as I lap you


I was thinking the improvements couldn't be a constant, .10 per 100 lbs, but would increase expotentionally(sp?) Where are the math/engineering majors.

BTW, I said all things being equal, so forget temp, grip, humidity, etc.


[Modified by TodaSi, 7:37 PM 5/9/2002]

 

just look at that lotus elise is it? wit a b18c5 engine in it. i don't remember much abuot it but isn't it around 1700lbs and runs 12s?