spin street tires at 70mph? and would it have more to do with torque or hp? Im thinkig torque but not sure. thanks

 

Don't know...

Why do you ask?

 

I want to know how much power i need to spin my tires while passing

 

Don't know if I could do it at 70, but mine will break the back end loose at 60.

the 700 r4 will downshift 2 gears and pull violently, thus breaking the tires loose. I would think it has more to do with torque than horsepower because when it downshifts that far it has to be doubling the torque. Just my opinion I might be wrong.

 

so how much power do you have eddie?

 

On nice , clean , coarse concrete probably Kieth Black type power

 

Best comment I have read all day.

It just paints a picture in my mind and I giggle like a school girl. I dont have any idea how much power that would take, but I would love to be able to do it. More than what I have got, I tell you that.

 

When I was first done breaking my engine in, I was able to break the stock tires loose at 60 by downshifting into second and applying full throttle while quickly engaging the clutch. I have something north of 400HP in a small block.

I'd have to recommend experimenting with this manouver before using it anywhere near other cars. I'f you've got enough power to really light them up at this speed, the engagement of the posi could make things dicey unless you're going really straight.

 

ok, heres anotehr similar question, how much power is needed to run 11s?

 

I have the opposite opinion of this question. WHY would ANYONE want to break the tires lose while travelling at 70 MPH????? The picture I get is a schoolgirl ASKING the question. Ditto for the question about how much power it needs to run 11s.

Okay....here's your answer to the first question, for what it's worth (which is NOTHING): Find some narrow nylon or rayon tires, find a tar-surfaced road on a 90+ degree day, and you can break them lose in ALL gears.

Answer to second question...it takes a LOT more than just "power" to turn 11s. You can have John Force's engine bolted in a car, and if the car isn't properly set up, you won't even get off the starting line. You'll
just sit there and smoke.

Dep

 

I did it at 50MPH no problem when I first put my motor in, until my tranny blew it was a lot of fun

 

Your answer is wrong. The question was how much HP would it take, not what tires and temp would it take. You should be paying attention in school little girl

A stock Z06 can run 11's. So at least 405hp.

 

i'd think it had as much to do with suspension and tires than with power. although if you put a twin turbo 632 in your car, i dont car what kind of suspension you have, there will be tire death.

 

here is some very technical auto math for an answer to your question on how much torque is needed to over come the coeficient of friction...

The BEST street tires can only support about 1.3 G launch, with rear weight shift the tires might see 1100 pounds of weight each so 2200 x 1.3= 2860 lb/ft......lesser tires might only allow 2200 x 1.1 G= 2,420 lb/ft. All seasons might be 2200 x 0.9=1980 lb/ft

So with maybe 300lb/ft (crank) x 0.787 (driveline loss factor) x 9.85 (tranny gear=2.78 * rearend gear=3.538) = ~~2325 lb/ft the lesser tires might spin/slip [or very close too it] if you are producing say 300lb/ft at 3,000rpms.

The general formula to use for total torque to the ground based on your gearing is as follows:

Crank Torque @ X,XXXrpms * Driveline loss Factor * Tranny Gear (1st, 2nd, etc.) * Rearend Gear = total lb/ft.

or

Rear Wheel (dyno) lb/fts @ X,XXXrpms * Tranny Gear * Rearend Gear = Total lb/ft.

This will give you a close approximation of the gearing and torque combo needed to spin your tires at any speed based on the torque gearing multiplications factors being applied from the gearings and your current engine lb/ft output per rpms. Other factors include type of road surface etc. A graph of each tranny gear would be useful in visually seeing at what point per rpm would you be most likely to spin your tires.

 

Your response makes even less sense. What possible difference does the 1/4 mile time of a Z06 have to do with spinning street tires???
Answer: NONE.

There are other factors MORE important than horsepower to spinning tires. Axle ratio is WAY more important than horsepower. You could get a STOCK V6 to spin tires with no problem. I know, because I could light up the front tires on my '02 Monte Carlo, and that was with the stock axle ratio.

The person also asks (for some totally bizzare reason) "I want to know how much power i need to spin my tires while passing".
Looks like there are some grade school kids accessing the forum, rather than doing their schoolwork.

As a side note...the Shelby AC Cobra equipped with the 427 medium riser engine could break the tires free in ANY gear.

Dep

 

Answer to how much power does it take to run 11's:

These numbers are from actual dyno testing and 1/4 mile slips on a '69 Camaro that I've been working on:

3200 pound vehicle runs 10.8 to 11.0 with 475 horsepower. This is with an exceptional 4-link rear end setup and a 5,000 stall converter that allows the car to launch very hard. With a stock rear suspension and a tighter converter you'd need quite a bit more power.

 

I see you are only about 19 years old. Let me tell you breaking the tires loose at 70 while passing someone is not a cool thing to do. You and the other person will end up in the ditch on the side ofthe road. Get some more driving under your belt before trying these types of "tricks". Now how much power to run 11s. Depends a lot on weight and how the car is setup. You can have 1000 HP and not get it hooked up right and run 15s. I have seen many slightly modded C5 cars run in the 11s. They are probably near 450 to 470 at the flywheel.

 

Head over to the dragracing forum. Last Saturday they had a slick right lane at the track and some very fast (9 and 8 sec) vettes which resulted in some tire spinning all the way down the track, including tire spinning well in excess of 100 mph. Check out some vids!



I don't mind "grade school kids" on the forum at all.
This is not a crazy or unreasonable question. We have all read the reviews of cars like the 427 Cobra where the writer says, "I hit the gas at 100 mph and the tires broke loose"... not unreasonable to ask, "Hey, how much power does that take?" But of course all of us rocket scientists know that with a front heavy car and bald tires on an icy road in Halifax you probably don't need a whole lotta power to accomplish that!

 

About 500ft/lbs of torque at the flywheel will break em loose at 70mph with decent size tires on the back

 

I would rather be able to start a wheelie at 70 mph then run on up

In fact ..... I can Just not in a cager