No, acceleration is determined by the SUM of the forces applied to the mass (high school physics again). Therefore you cannot neglect aerodyamic drag or rolling resistance -and this becomes a huge factor in the upper end of highway speeds. Drag is the reason bikes are weaker on the top end -I never mentioned high or low revving.

 

Actually my torque curve and alot of RX-7 torque curves are pretty darn flat between shift points. Next

 

Exactly. That is why I said, cars like the FD and S2000, will always have a greater advantage from a roll, rather than a dead stop. Whether or not they could defeat a viper, was not what I was saying, as I already said the FD would loose. However, if they were going from a roll, the FD would stand a much better chance in it's own right.

And torque by itself is nothing, engine RPM's are a large part of the equation, and an engine that is able to rev. higher (all other things being equal), will always be more powerful.

Also true, but I myself was refering to the FD's peak torque level, which is in the mid range.

 

If revs mean nothing, why do you mention them in your example?

 

http://66.216.67.51/images/products/dynos/dynograph.jpg

...most will follow a similar shape, but sequential will be flatter down low. (albeit the numbers may be lower or higher)

Look at the torque curve BETWEEN THE SHIFT POINTS (IE 4.5-8k)

ski jump eh Mr Wizard?

 

ACTUALLY, ACCELERATION IS THE CHANGE IN THE RATE OF VELOCITY (dv/dt).

 

That is also true, but we were not trying to define acceleration, but rather how an object accelerates. lol, this entire thread seemed to be a misunderstanding.

 

Hehe... No ****... It started with advice on racing a Viper and went to a highschool (quoted, no flames) physics class. Who cares what the factors are.

There are RX7's that will beat Vipers from a roll, and a dig. There are Vipers that will beat a RX7 from a roll and from a dig. What's the argument?

In this case... The RX7 will most likely lose. Not like it never happens. Vipers are badd ***. But who really cares?

 

ACTUALLY, ACCELERATION IS THE CHANGE IN THE RATE OF VELOCITY (dv/dt).

 

I hear you. You basically sumed it all up. The RX-7 in current form, will more than likely loose.

 

To all you people bashing on the 16 year olds and theyre fast cars, I'm 16 and drive a 93 RX-7 so whats wrong with that??

 

This turned in to who knows science better...

anyway.. I have to admit 16 + fast car doesn't go together...

If you are young and drive fast car, more than likely u'll get bunch of speeding tickets or getting in to a car accident.

I learned this **** in hard way

 

It's about experience also. Sometimes you know you're screwed, and then it feels like 4 hours until you crash into the tires or hit the guard rail, or realizing your braking zone should have started back 30 feet before you started braking and the road is too bumpy to late brake.

Anyhow, you guys talking about the whole acceleratin thingy, you're all right for the most part. There are many factors/ variables in speeds.You would have to dyno the cars to look at the their power curves, you would have to take into account the weight and power, the gearing in the trans and diff, the RPM (horsepower means time is involved), the aero efficiency (drag co-ef), you would have to map out location in regards to time to build a relation with the characteristics of the engine, speed, time, and distance.

The whole "will I beat a xxxxx car with my xxxx horsepower car" is sort of drab. The only people that can really answer you are people that done it and you in the future. The driver is a huge variable and it's rare to have the same result every time. You could misshift and lose to some Chevy S-10 or the Supra misshifted and get past. Or maybe your clutch is a piece of **** and can't hold squat or you have an aluminum flywheel and never could launch it right... so many variables just to say...

Street racing is fun, it's gambling just like anything else out there. Even driving aggresively on the street is gambling. It's easy to say, "take it to the track" but many people don't. Just be smart about what you do and know what you're getting yourself into. Having a lot hot car puts a giant label on you from just about everyone... including cops and old ladies!

 

ok here is all i gotta say, first of all that one guy tellin people to crack open thier physics book should know that thier are many other factors other thatn the force that the engine appys on the drivetrain and after a couple other parts to the wheels. i can show him a 600 some odd horsepower car taht is slow as all hell, gearing matters. now im not saying that the viper is geared ungodly high, cause its not. also he must realize that hp and torque is an output of rpm and is constantly changing. that said ill go back to listening to my college physics teacher, i believe we are discussing this kind of subject

 

Nothing, as long as it's not a CYM

 

put dawn soap on his tires then race from a dig i dont care who you are if you got soap on your rear tires your not gonna be going anywhere fast or that tire wet stuff works pretty good too if you put it on the tread
<~~~~~ is really bored

 

hey, i read a thread like that, some kid put tire gloss on his tread and lost his brand new lexus is300. it was on the lexus forum somewhere.

 

hey now, whats wrong with the CYM, lol. I am 24 and have a CYM, a little different than a 16yr old though

 

You know what else I just noticed, in the title of this thread it says you were going to race him "this" weekend which was almost 2 weeks ago, is it safe to assume this never happened??

 

Not yet..
last week we couldn't race cuz cops were after streetracing.

I might race him after i get my 7 tuned n fix my FPD / o ring.. (smell fuels when im boostin)
or might race him tomorrow if road is dry..

i'll open up new thread after i race him.

 

Nothing is wrong with a 16 year old having an FD as long as it's not a CYM, DON'T WANT THOSE WRECKED!

Understand now

 

RAced it.. heres da story..
Running 10 -11 psi (because of damn fuel smell.. didn't wanted to turn it up higher and also had one passenger + 18 inch blitz rims)

We were doing about 40 mph on interstate.
beep, beep, beep, race starts I was in 2nd gear
rx7 pulled about 1 car... as soon as i changed to 3rd gear, the Viper caught up n he started to pulling.
end of third gear he was about 1-1.5 car ahead of me.

4th gear I started to catch up lil bit but then viper slowed down ...

I must say it was good race.. pretty close race.
We'll race again when I get mine tuned + fmic @ 15psi..

I think i can take it....No problem-o

i'll post some pics / short mpeg video soon..My friend really didn't catch full race....
it looked pretty damn close from behind. i heard....

but I admit viper was FASTER... mad props to him.

Now let me tune it and put stock rims and race him again..lol

 

Gotcha!! Well I dont mind if more get wrecked, makes mine that much more rare, haha, just kiddin' guys, be careful!!

 

thats ridiculous "16 is to young" my *** it is. I'll be 18
in a month and I'm the best driver I know. care to ask my
family or any body hwo knows me? givin the same car I'll
roll and smoke any of you old guys. and as far as speeding
tickets and reckless driving go I've never bin in any recks
and the only ticket I got was in my moms van because parking
at school.

 

thats ridiculous "16 is to young" my *** it is. I'll be 18
in a month and I'm the best driver I know. care to ask my
family or any body hwo knows me? givin the same car I'll
roll and smoke any of you old guys. and as far as speeding
tickets and reckless driving go I've never bin in any recks
and the only ticket I got was in my moms van because parking
at school.