27 votes
Accepted

Does flooring the throttle while traveling at lower speeds increase fuel consumption?

Bear with me, I'm going to clear up a myth, then answer your question. You will see that they are related. Higher throttle doesn't mean higher RPM. Higher throttle just means more fuel entering the ...
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  • 5,216
22 votes
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Clutch less shifting - why does it work? Is it bad?

You can do this if your engine RPM, the speed of the vehicle, and the gear you are shifting to/from is just right. The reason you can do this is because you have synchros in the transmission which ...
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17 votes

Use of Neutral Gear in Automatic Transmission

When the car is in D and you start the engine the hydraulic pump in the automatic transmission is not providing fluid pressure until the engine starts. This fluid pressure is used to engage clutches ...
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  • 181
15 votes

What mechanical action is heel and toe (clutchless) shifting trying to accomplish?

Heel-Toe shifting and clutchless shifting are 2 different things. I guess they can be done together.... The one thing both of these techniques have in common is rev matching. There is the RPM you ...
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  • 8,393
15 votes
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Is reverse gear in a manual transmission equivalent to any other gear?

Reverse is pretty equivalent to first gear, for a ratio of around 3.2ish. If it were any lower, it would be difficult to get started from a stop since the torque just won't be there. If you've ever ...
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  • 484
14 votes

Does flooring the throttle while traveling at lower speeds increase fuel consumption?

My Volvo V70 (model year 2006) has the digital dashboard fuel consumption meter. I also have a nice, fairly long uphill climb on my way to work, so I've had opportunities to try various methods. This ...
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  • 452
14 votes

How do I put my automatic car into neutral while moving in drive?

You can put your car into neutral by moving the gear selector into the position marked "N".
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  • 934
12 votes
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Skipping gears when downshifting

If your car is slowing down, and you are at a "safe" speed for 2nd gear, then its perfectly normal to skip gears. If you're going the wrong speed and the engine RPMs aren't even close to what they ...
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  • 13.2k
11 votes

Need to rotate an out of reach bolt or pin

Did you ever wonder why an open ended wrench is angled at exactly 15° ? That's so you can turn a nut a little bit, flip the wrench over, turn it a little bit more, and get the job done! You ...
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  • 6,419
11 votes
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Mysterious "5th" Gear on a 4-Speed Automatic?

The transmission has a lock up torque converter. The torque converter sits between the engine and transmission. It is kind of like a clutch on a manual transmission car. When the engine is idle, it ...
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  • 8,393
10 votes

Is it OK to skip gears on a motorcycle?

It depends on how you do the skipping If, when you do it, you hear loud clunks, that means you are not matching the RPM's to the road speed, to the transmission. Motorcycles have a synchronous ...
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  • 32.7k
10 votes
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Automatic Transmission - Shifting from Neutral to Drive while in motion

This is a bad idea for several reasons. First, you run the risk of a runaway car. Second, you risk damaging your transmission, which could cause the runaway car in the first place. Thirdly, in newer ...
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10 votes
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Clutchless Downshifts Using Throttle Blip on a Motorbike/Sequential Gearbox

Background The Ducati transmission type is a constant mesh sequential. There is a ride by wire system that controls the the throttle butterfly's. Ride by wire is necessary in order for the ECU to ...
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10 votes
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Should I wait for my car to be completely stopped before putting it in reverse?

It causes more wear on the clutch as you have to ride it a little more, but overall its fine. The syncros will likely wear a little faster also as the output shaft will be spinning in the opposite ...
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  • 8,393
10 votes
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Why is it almost impossible to put the car in first gear at high speeds?

There are physical limits to sychronizers. When you upshift the synchronizer slows the clutch down which is relatively easy. When you down shift the synchronizer has to speed the clutch up which is ...
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  • 15.9k
9 votes

What mechanical action is heel and toe (clutchless) shifting trying to accomplish?

I'm going to expand on rpmerf's answer, where he has disambiguated between Heel and toe and clutchless shifting. I'l briefly explain the driving technique only to better illustrate what it hopes to ...
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  • 2,186
9 votes
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My car locks lower gears when on high speed, why?

I'm assuming you have a manual transmission. Stop doing that, you will damage your transmission. Your powertrain can be broke down into three sections. The engine, including the fly wheels. The ...
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  • 15.9k
8 votes
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How to make an electronic system know which gear the engine is on?

If the engine had a gear position sensor or you were considering installing one, i'd assume you wouldn't be asking this question. Anyhow, still , if you can install one, that'd be your easiest option, ...
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  • 2,186
7 votes
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Why are gears designed in this pattern in motorcycles?

Look at it this way, the sequence is indeed linear - 1-2-3-4 and so on, with the neutral sitting in-between 1st and 2nd gear. Which means, to shift to neutral from 1st gear (or down from second), one ...
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  • 2,186
7 votes

Why are gears designed in this pattern in motorcycles?

Chilljeet has a good answer, but it's also partially a safety thing. When you're slowing down to a stop, you're clicking down in the gears until you can't click down anymore. If the bottom gear was ...
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  • 71
7 votes

Manual Transmission- Can bad shifting destroy transmission

Is it OK to "half-shift" in order to inch forward in tight spots? This is usually called slipping the clutch and as long as you don't do it for prolonged periods of time will not damage the clutch. ...
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7 votes
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Are there cars that can shift to reverse even while moving?

There is a distinction that needs made between an automatic and a manual. The majority of automatics will lock out reverse above a particular speed usually several miles an hour. If the car is below ...
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6 votes

Does giving gas while releasing the clutch cause unnecessary wear?

Yes it's okay. As long as you are letting go of the clutch by a little bit and at the same time, you give it a little bit of gas. If you just let go of the clutch without giving any gas in first gear, ...
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6 votes

Manually shifting an automatic transmission?

I've rebuilt a few transmissions (actually a lot of transmissions LOL) and no, manually shifting is just fine. All your doing is replacing the TCU with your own shifts. So your just fine manually ...
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  • 71
6 votes

Fuel efficiency and Shifting/RPM

The specific answer to your question lies in the BSFC (Brake Specific Fuel Consumption) map for your engine, combined with the desired output. The BSFC map shows how efficiently the engine converts ...
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6 votes
Accepted

What mechanical action is heel and toe (clutchless) shifting trying to accomplish?

By matching the engine RPM to the revs in the gearbox, the 'synchro rings' that automatically match the gear speeds in the gearbox for you have less to do. If you are clutchless changing all the time ...
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  • 206
6 votes
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How would you stop if the ignition switch failed while driving?

The brakes should still work, but without power assist so they take more force. Same for steering. I would shift to N and then brake while heading to the shoulder. I had a K1500 Blazer of about this ...
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  • 148
5 votes

Does Downshifting (Engine Braking) Cause Extra Wear and Tear?

Some answers correctly identified wear of synchronizers as a possible concern on manual transmission cars, but then they offered double-declutching as a solution. However, it is very hard to correctly ...
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  • 13.4k
5 votes

Does Downshifting (Engine Braking) Cause Extra Wear and Tear?

Using up your clutch to slow down all the time? Replacing your clutch will cost you several hundred bucks, and unless you have a lot of special equipment, you won't be able to do it yourself. Any ...
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5 votes

Transmission won't shift into second after rebuild

It sounds like the 1-2 and 2-3 (A/B) shift solenoids are continuing to be energized or are stuck in the on position. According to the 1994 Camaro/Firebird Service Manual (pg 7A-14A-6): The PCM ...
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