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11
votes
6answers
282 views

What is the difference between torque and horsepower?

A very basic question - what is the difference between torque and horsepower? Its all over Google, but I am really confused and can't get any satisfactory answers. I'll tell you my confusion: Torque ...
22
votes
6answers
1k views

When is a cold air intake system beneficial?

Cold air intake must be one of the popular mods there is, and one subject to the most controversy as well. Manufacturers of such systems advertise 5-20 HP gains, yet there are claims that this mod ...
1
vote
1answer
61 views

Changing gears at what speed? [closed]

Can someone please link me to a website where I can get the speed at which a car must shift gears, (manufacturer wise would be better). Or maybe, link to a website where I will be able to calculate ...
8
votes
1answer
57 views

Computing Wheel Torque From Engine Torque

It seems possible to obtain engine torque and RPM from a truck CAN bus. I'd like to estimate tractive force at the wheels given these two values. How should I go about computing torque at the wheels? ...
5
votes
1answer
25 views

On-Board Diagnostics (OBD) Readiness Monitors

I would like to know how does apps like Torque calculate if my car (Hyundai i10 Era) is 'Not ready' yet? What are the factors (complete list) do one checks to decide? Is there any formula to calculate ...
6
votes
1answer
38 views

Will increasing line pressure increase torque capacity?

I was wondering if one were to increase the line pressure sent to the clutch packs/bands on an A/T would that increase the torque capacity of said transmission? I figure it would because it would ...
4
votes
1answer
86 views

Lexus RCF - Torque Vectoring Differential, How Does it Work?

I was reading about the Lexus RCF and how it has a torque vectoring differential and how this differential has the ability to put more torque on the outer turning wheels rather than on the inside ...
2
votes
1answer
58 views

what damage or extra wear (if any) is caused by turning over the engine while in gear (manual transmission)?

While newer cars never allow you to turn over the engine without the clutch depressed, in some older cars, if you do leave the transmission in gear, do not depress the clutch and turn the key, the car ...
2
votes
0answers
60 views

Question about Ryobi P261 Impact Wrench Torque

I am planning to buy this Impact Wrench: http://www.homedepot.com/p/Ryobi-ONE-18-Volt-1-2-in-Cordless-3-Speed-Impact-Wrench-Tool-Only-P261/205885687 This Impact Wrench has 3 speeds: 0-2,900 RPM for ...
2
votes
2answers
68 views

Can I use my 1/2 inch torque wrench with smaller sockets?

I have a relatively expensive 1/2-inch torque wrench. Not all of my sockets are 1/2" and many of them are smaller. Is there any problem with using a socket adapter, so I can use my 1/2-inch torque ...
3
votes
1answer
55 views

How do I find out the proper torque number that I need to apply to an oil filter?

I am hearing mixed opinions how much should I tighten an oil filter. Does it depend on car or filter type? How do I find out the proper torque number that I need to apply to an oil filter? Thank you. ...
6
votes
1answer
372 views

Measuring Horse Power and torque without a dynamometer

I know I can take my car to a workshop and have a Dyno Run and can read the HP and torque figures from that. What I want to know, is there an alternative way to know the HP and Torque figures without ...
4
votes
2answers
72 views

Engine rev in motorcycle

I somewhere read that for a good launch we should hold engine revs at peak torque, not peak horsepower. What does "hold engine revs at peak torque, not peak horsepower" means? How can I hold engine ...
0
votes
1answer
96 views

Who decides Idle engine rpm and how? [duplicate]

I was just searching for an answer to find how the idle speed of an engine is decided and who makes that decision. Is it the engine designer alone or is it based on the inputs from all the vehicle ...
1
vote
1answer
59 views

How to measure torque statically?

I am familiar with the concept of torque wrench. However, with a torque wrench, one can only apply a desired amount of torque. Is there a way to measure how much torque has been applied to a certain ...
6
votes
4answers
543 views

How to measure angle when ratcheting a bolt?

The torque spec for my Tacoma says that cylinder head bolts should be torqued (in a specific sequence) to 27 ft/lbs initially and then again each should be turned another 180 degrees in the same ...
6
votes
3answers
903 views

Torque curve on modern turbo-charged petrol engines

How can modern turbo-charged petrol engines have such constant torque plateaus over a broad rpm range. Does the mathematical relationship between torque and power still hold here? This looks totally ...
5
votes
4answers
1k views

Why does the power output peak and then drop as engine speed increases?

I have been looking at the power bands for my car (2000 Opel Agila 1.2) recently, as I want to work out when it is best to change gear and stuff, as I have no life! This is the approximate graph I ...
6
votes
1answer
287 views

Torque spec variance with Anti-Seize

I see a lot of variances with torque specs when a fastener is lubed with anti-seize. Some places say 25% less torque is required for same clamping load, some places say 40% less is required. I'm ...
4
votes
1answer
131 views

Could 1.9 Nm be enough to accelerate 130kg electric go-kart?

I'll apologize in advance for a fuzzy question. My problem consists of two parts. For starters, I'm trying to buy a DC engine for learning purposes and most of them only specifies the watt (which I ...
3
votes
1answer
65 views

What is the general rule, if one exists, for determining the difference between crank horsepower and wheel horsepower?

If a vehicle has a known crank or wheel horsepower rating, is there a method that can reasonably estimate what the other horsepower value should be? If so, what is that method? For example, if a ...
1
vote
1answer
123 views

Engine torque throughput curve is flat or wavy in low gears between 2000 and 4000 rpm

As the title says BMW's (93 E34 525i M50B25TU) engine misbehaves in low gears, namely in 1st and 2nd, most of the time when the engine is cold but sometimes even when it is properly warmed up. The ...
7
votes
5answers
130k views

What is the meaning of BHP and torque in bikes or cars?

BHP = Brake horse power. It says that it is brake horse power but it is generally relates with high pick up (your bikes reaches top speed in lesser time). So what does this actually mean?. Torque = ...
0
votes
2answers
558 views

Torque and engine power [duplicate]

What is the relation between Torque and engine power? Just wanted to know how power is distributed to wheels in a car.
6
votes
4answers
5k views

Aligning a castle nut with a torque spec to a cotter pin hole

The nuts at the knuckle on my outer tie rod ends are castle nuts, which are locked by cotter pins fed through holes in the studs. The nuts also have a torque spec (27.0±2.5 N∙m, in this case). If I ...
4
votes
1answer
332 views

What is the difference between an automatic torque wrench and a click wrench?

What is the difference between an automatic torque wrench and a click torque wrench? Right now the 1/2inch torque wrench I use on my Jeep is a really cheep one I bought on amazon and it clicks when ...
4
votes
2answers
182 views

If I were to convert a gas powered automobile to an electric car, would a difference in specs possibly damage the car?

I would like to convert a Mazda Miata into an electric car, I plan to remove the engine and the gearbox, and have the car be a direct drive. The motor I intend to use has twice the torque of a ...
5
votes
3answers
4k views

Does accelerating faster worsen fuel efficiency?

I've often heard that accelerating harder makes for bad fuel efficiency, but have yet to be given a sound explanation of why. Naturally this makes me question this advice. Now obviously when you ...
0
votes
2answers
186 views

Does torque decrease mathematically?

There are 2 cars, car A and car B. Car B is 20% heavier than car A. We all know that this means that these 2 cars will have same power if car B at the same RPM (revolution) has 20% more Nm. Can the ...
3
votes
1answer
212 views

Wheel re-torqueing, how is it done?

When putting wheels back on a car, you place them on and torque them to spec. Now, most if not all manufacturers say to re-torque them after 50 miles. What is the procedure for this? Do you just ...
6
votes
2answers
916 views

Do I need to lift my car up before adjusting lug nut torque?

I recently put new wheels on my car. I don't have off-street parking, much less a garage to work in, so I had the wheels installed by a mechanic. Since they were installed, they have been driven ...
2
votes
3answers
2k views

What is the torque and sequence for a '99 Jetta Oil Pan?

I have a '99 Jetta TDI (diesel) with a cracked oil pan. I'm looking for the sequence of tightening the bolts and the torque needed for each bolt. I've been doing to google-fu but can't seem to find ...
14
votes
2answers
1k views

Should a mechanical “click” Torque Wrench be set to zero when not in use?

I have a standard click torque wrench. I was told I should set it to zero when not using it in order to keep the accuracy high. Is this true? Secondly, I have not been doing this since I purchased ...
4
votes
2answers
561 views

engine underpowered in idle - what can be done to improve a diesel engine power at low RPM just a bit?

There is an engine which is a bit underpowered when idling, it can not even keep the car moving on a flat road when in gear and idling at 700..800 RPM - see link. What can be done to improve its ...