Burzhui

... decide to leave it in neutral, then bring up the rpm to like oh i dunno 1500 or 2000, and then slam it into drive... with an automatic tranny.... anyone tried this?

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OC

Bad. Very bad. Real good way to kill your tranny.

-OC

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Jeffbx

Yes. Bad. Done it before & it's fun, but bad if you want to keep driving the car....

I used to do it on an old '68 Buick & it does spin the tires, but I'm amazed I never damaged the tranny. I got the car for free after helping a guy move (he didn't want to take it with him) so I didn't care too much.

Burzhui

yea i figured that much

how about if you are in drive and you stop at a stop light and press the brake all the way in and then push the accelerator to about 1500 how would that roll over?

OC

That's called "brake torquing". It's the method that drag racers use at the strip, and also the way that car magazines test cars to get performance stats. No real harm is done, though it does cause the tranny fluid to heat up VERY quickly. It's heat that typically kills an auto tranny, so if you do this on a regular basis get a BIG tranny fluid cooler installed.

The correct method is this: with the car in drive, press very firmly on the brake pedal. Give it enough gas until RPMs no longer increase. Release the brake, and gently floor the accelerator. If you don't break the tires loose, be more aggressive with the throttle after you release the brake. If you break the tires loose easily, be more gentle with the accelerator, and/or use a lower RPM before you release the brake.

-OC

Burzhui

by throttle you mean accelerator right?

Aristo

I'd say try different RPM for the optimal performance. My car couldn't get enough traction due to the enormous amount of torque. Last time it took about 3 seconds to get the grip. Probably the RPM was too high but it was fun.

EvilHorace

Actually, 1500rpms is about normal stall speed for a stock torque converter so what you're doing at THAT speed isn't critical but also is not good for the trans as it's likely you'll try higher rpms which is then called a "neutral drop" and if done at high rpms, it'll definately ruin the trans.

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TommyBoomfiger

i always thought that drag racers had a special braking system which put less pressure on the rear wheels when they needed to heat up the rear tires

EvilHorace

Drag racers use what's called a "line lock" on the front wheel brakes which hold the front brakes. That way, they can easily spin the rear wheels to heat the tires up and it'll hold the car from creeping forward while at the light and bring up rpms.

shoeish

Line locks are for weenies... Its not hard to manipulate three pedals with two feet.

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TommyBoomfiger

thats what i thought

EvilHorace

"Line locks are for weenies... Its not hard to manipulate three pedals with two feet"

It's usually if not always used with auto trannies, which are more consistant for drag racing than a MT.
20 yrs ago when I had my old 60s era front engine rail dragster that only had rear brakes, I would have liked to have front brakes with a line lock as it was impossible for me to raise the rpms at the light and hold the car from moving. It could have used a high stall torque convertor too but ideally you'ld want a high stall convertor and line lock so that you can raise rpms and keep the car from moving at all while waiting for the green light.
Sure, with a MT you don't need it but launching at high rpms with a MT ruins either the clutch disc or trans bearings as I've done that before, once very intentionally when I was highly agitated. I got into a new car and launched it at about 6000 rpms hard, blew the disc to pieces in a second (wasn't my car......ooops).

ribitch

neutral slams are great, as long as its not my car!!!!

A friend of mine had a POS escort, and we always did crap like that. It was a great time. Needless to say, it didnt last too long. The car eventually dies, so he called a junkyard to come get it from his place. He paid them 50 bucks to do it.

What the junkyard didnt know was we were going to have some batting practice with the car. We beat the piss outta that car. Nothing worthwhile was left on the car. Tires were slashed, windows blown out, he pulled the heads, radio, speakers, and anythinbg worth some sort of value.

The best was the interior. The steering column was totalled as well as all the seats. I wish I would have had a digital camera. I should see if he has some pictures I could scan and post

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jase71

I used to do that, with a twist, when I was a kid, and driving
my parent's vehicle.

Took a little pickup, and rather than dropping it into gear from a standstill, first you pop it in reverse, and get going 15-20mph backwards first. THEN you drop it into gear and floor it. Even better than from a standstill. "Reverse-to-lows" are a little hard on the tranny, though.

My dad never did understand why that truck was falling apart by the time I left for college. And I never bothered to tell him.

Now that I'm "grown-up" and pay for my own vehicles, I don't do such stupid things anymore...

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