Skip to main content
50 votes
Accepted

What are the benefits of a lightweight flywheel and why aren't they lightweight already?

The main advantage to a lower flywheel mass on race cars is that the reduced mass allows the engine to rev more freely. The overall weight loss to the car is really not the key thing, it's letting the ...
cdunn's user avatar
  • 9,296
29 votes

What are the benefits of a lightweight flywheel and why aren't they lightweight already?

cdunn's answer is spot on. To add a bit (especially for cars), in a race car you often want to be dropping from something like 7000 rpm to maybe 5500 rpm (or an even higher band, depending on the ...
J...'s user avatar
  • 692
13 votes

What are the benefits of a lightweight flywheel and why aren't they lightweight already?

Physics dictates that rotational inertia impedes acceleration... which is why a lighter flywheel is considered to be a performance mod Less rotating mass = more acceleration, if all else is equal ...
Zaid's user avatar
  • 39.2k
11 votes

What are the benefits of a lightweight flywheel and why aren't they lightweight already?

The flywheel keeps your engine spinning The inertia of a flywheel is in direct proportion to the mass of the flywheel. Newton's first law of motion states, "An object at rest stays at rest and an ...
DucatiKiller's user avatar
  • 32.9k
11 votes
Accepted

40MPG at 100MPH?

One of the reasons is loads of extra weight added by safety features and options. 8 airbags, 12 speaker stereo, 14 way adjustable seats, tons of insulation all around, power windows, power locks, 18 ...
rpmerf's user avatar
  • 8,403
9 votes

What are the benefits of a lightweight flywheel and why aren't they lightweight already?

One thing which hasn't been mentioned here about why a lightweight flywheel may not necessarily be a good thing for the street is, just like brakes, the rotational mass of a regular weight flywheel ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
9 votes

3 rings vs 4 rings pistons: which design is better?

There are trade offs, so no clear answer here. First of all, just to be anal and clear something up ... what you have is actually a 4-ring and a 5-ring piston. The oil control ring at the bottom ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
8 votes
Accepted

What is the benefit of Forged Internals in an engine? Pistons, etc

Forging is a process where hot metal of the rough shape is then very forcibly squished by exact shape dies, severely compressing the metal or alloy molecules. There are internal tensions created ...
SteveRacer's user avatar
  • 12.4k
8 votes

Increase my cars BHP?

I'd say the only realistic option with a 1.3 liter turbodiesel besides an engine swap is chiptuning/remapping. And even then I'd research the potential of this engine, you'll be shortening it's life ...
I have no idea what I'm doing's user avatar
8 votes

Horsepower and turbo

I think there are two factors which you are not taking into account in your analysis. First, final drive ratios make a big difference in how a vehicle behaves performance wise. I wouldn't know exactly ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
7 votes
Accepted

What are the consequences of using an expired tire?

Short answer: Yes, yes and yes. BUT: A tire doesn't have an expiry date. The reason for all three points is that the rubber gets harder over time and looses its grip / traction, especially on wet ...
sweber's user avatar
  • 7,057
5 votes
Accepted

What is gained with "performance" spark plug wires?

There isn't any performance to be gained from spark plug wires, just better build quality, which gives you not a better spark, but rather maintains an appropriate spark for more miles/years before ...
tlhIngan's user avatar
  • 12.2k
5 votes

What is gained with "performance" spark plug wires?

Here's an article that explains spark plug cables. It had some interesting information that I hadn't really thought of. That said, I'd say the largest difference in consumer grade spark plug cables ...
kyle_engineer's user avatar
5 votes
Accepted

Remapping a used engine

That's a broad question, and I'm a Subaru geek, not a VAG geek, but I'll share my never-humble opinion. Any flash that increases performance obviously increases stresses. A proper remap with careful ...
SteveRacer's user avatar
  • 12.4k
5 votes

Increase my cars BHP?

Unfortunately, there isn't a whole lot you can do with a 1.3CDTi - as the others have said, make sure it's in the best condition you can, but you're not going to get the 'kick' you desire. I'm ...
Nick C's user avatar
  • 28.8k
5 votes
Accepted

Most effective weight reduction in modern cars?

Depends on your comfort level. AC system (complete, condensor, compressor, evap, piping, etc), stereo, and every bit of interior except the seats and critical controls. Glovebox, airbags, related ...
SteveRacer's user avatar
  • 12.4k
5 votes
Accepted

Why do most performance cars have longitudinal engines?

It's quite simply because a longitudinally mounted engine equates to less of an engineering challenge to achieve "balance". Imagine something like a large V formation engine, two banks of cylinders, ...
Steve Matthews's user avatar
5 votes
Accepted

Is it more efficient to drive with the windows down or the AC on?

This depends on driving conditions, mainly speed and temperature. AC fuel consumption increases with temperature fuel consumption due to open windows increases with speed The SAE found that AC is ...
Hobbes's user avatar
  • 4,412
4 votes

Why do modern vehicles omit a temperature gauge?

Your sample may just be non-representative. All the ones I know (I'm mostly into Japanese performance cars) have oil temps. Even many non-performance cars have an indicator that goes out once the ...
Rory Alsop's user avatar
  • 18.6k
4 votes

Why isn't the Pikes Peak Hill Climb used as a benchmark for automotive companies?

Pikes Peak represents a fairly arduous trial and if you hope to race a standard roadcar in the hillclimb you'll find you won't meet the safety requirements. To race a prepared competition car tells ...
Steve Matthews's user avatar
4 votes
Accepted

Likely cause of poor performance at low RPM but normal at higher RPM?

Before everything else i would check the spark plugs. Under certain circumstances a crack in the insulator can cause problems at low rpm's but would be not feel-able with high rpm's. Edit, and ...
Martin's user avatar
  • 8,458
4 votes

Best quicker faster acceleration NGK spark plugs

Faster starts and quicker acceleration require more torque. I suppose spark plugs might make some difference there, but I don't think you'll see a significant change if the engine is reasonably well ...
dlu's user avatar
  • 14.5k
4 votes

How to increase the lifespan of a diesel turbo?

Axleaddict.com shares 5 tips on how to extend turbo life. Here they are: Regularly Scheduled, Synthetic Oil Changes On turbos, it is recommended to change the oil every 8,000 km (5,000 ...
anonymous2's user avatar
  • 5,235
4 votes

Will eliminating factory catalytic converter have effect on emission testing?

Yeah. With out other illegal cheats you won't pass a real emissions test. There are sensors in your exhaust system that provide feedback to the engine computer. With out your catalytic bricks in place ...
zipzit's user avatar
  • 6,559
4 votes
Accepted

Will eliminating factory catalytic converter have effect on emission testing?

In most places which have emissions testing, not only is there a smog test (where they attach your car to a computer), there's also a visual test. The inspector views to see that all emissions ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
3 votes

What is gained with "performance" spark plug wires?

As @tlhIngan said, the benefit of good wires isn't so much the quality of the spark when they are new, but the longevity of the wires. Spark plug wires don't lead an easy life, they are exposed to ...
dlu's user avatar
  • 14.5k
3 votes

Torque reduces gradually after certain RPM

Torque is a rotational force. It is a measurement of how hard it is applying force that causes the crankshaft to rotate. Torque is not a very good unit of measurement for an engine because it does not ...
doug65536's user avatar
  • 261
3 votes

Please help with my Intake for Opel Corsa 2014

This is a very difficult question to answer. Altering the airflow path before the airflow sensor can lean out an engine, which might improve performance, but cause unnecessary heat and stress. ...
SteveRacer's user avatar
  • 12.4k
3 votes

What could be the reason and solution to a sudden drop in mileage?

If the drop is sudden and temporary then it is probably due to a active regeneration of the DPF where extra fuel is injected into the cylinders, not part of the power stroke, to create extra heat in ...
Desbe's user avatar
  • 31
3 votes

What is gained with "performance" spark plug wires?

From many years of selling both 'standard' and 'high-performance' HT lead sets, here's my advice: If you're replacing your lead set because it's simply time to do so, buy the cheap ones: they're ...
Bevan's user avatar
  • 561

Only top scored, non community-wiki answers of a minimum length are eligible