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20 votes
Accepted

Turbo equivalent on electric motors

The "take some of the output force to reuse it as input" can be interpreted as regenerative braking, but the big differences are: Regenerative braking takes power back from the wheels while turbo ...
Gabriel Diego's user avatar
17 votes

Turbo equivalent on electric motors

regenerative braking This question and answer regarding the subject matter has some very good information in it as well the answer reveals a mathematical paradox with regenerative braking What is ...
DucatiKiller's user avatar
  • 32.9k
17 votes

Turbo equivalent on electric motors

No, there isn't any equivalent. A turbo is used because combustion engines are inherently inefficient: they convert chemical energy into mechanical energy, using an awkward detour via heat. ...
leftaroundabout's user avatar
15 votes

Oil draining out shortly after turbo hose detached/broke

In bold, I'm answering the questions at face value, specific answers for your scenario are below each bold answer. 1: I would be a bit concerned about driving this car until diagnosed by a mechanic. ...
H. Daun's user avatar
  • 656
15 votes

Why is it that when supercharging, it's preferred to compress the input, rather than pull a vacuum on the exhaust?

The power of an engine is not determined by the difference in pressure between the combustion chamber and the exhaust. Power is determined by how much energy one can put into the combustion chamber ...
fred_dot_u's user avatar
  • 4,580
14 votes
Accepted

Can I attach a DC blower to intake manifold of my 150CC Yamaha FZS FI engine?

I thought it could work more like a supercharger, except it will be powered by battery instead of engine. This isn't the first time someone has thought of "electric" supercharging. There's nothing ...
Zaid's user avatar
  • 39.2k
13 votes

Why is it that when supercharging, it's preferred to compress the input, rather than pull a vacuum on the exhaust?

OP's question states: It should follow that turbocharging should be equally effective pumping air out the exhaust, than in the inlet. No, it is not as effective. You can't reduce the pressure to ...
Weather Vane's user avatar
  • 2,314
11 votes
Accepted

What are the various causes of preignition / detonation?

Most of my knowledge comes from turbo engines. Detonation or preignition is caused by the air/fuel mixture igniting before the spark plug fires. The mixture is typically ignited by a hot spot either ...
rpmerf's user avatar
  • 8,403
11 votes

Can I attach a DC blower to intake manifold of my 150CC Yamaha FZS FI engine?

Using that kind of blowers as turbochargers is generally proved worthless. The main drawback is these devices are not capable of creating any significant pressure, especially considering internal ...
max's user avatar
  • 336
9 votes

Minor boost leak and shrill tone at peak boost: hose clamp, gasket or blow off valve?

It is quite likely the work performed has introduced a subtle air leak that only manifests itself under high boost. Pressurizing the intake tract with the car off will help you identify the source of ...
Zaid's user avatar
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9 votes
Accepted

Why is it that when supercharging, it's preferred to compress the input, rather than pull a vacuum on the exhaust?

IMO this is not a stupid idea, however it doesn't actually make sense for multiple reasons: A naturally-aspirated Otto or Diesel engine by itself doesn't expand the gas even to atmospheric pressure. ...
leftaroundabout's user avatar
8 votes
Accepted

Is there a 1:1 relationship between boost pressure and power increase?

Preamble What does forced induction buy? In a word, density. Remember: For compressible fluids, pressure alone doesn't tell the full story But pressure and temperature together do. The old ...
Zaid's user avatar
  • 39.2k
8 votes

How do I install a turbocharger and a supercharger on a 2008 Hyundai Accent?

I suspect a 96bhp 1.4 engine would struggle to provide enough power to spin up a supercharger and two turbochargers. I also suspect that the charging units you have chosen would not be well matched ...
Steve Matthews's user avatar
7 votes

Is there a 1:1 relationship between boost pressure and power increase?

tl;dr: no, a 1:1 ratio is only possible in imaginary perfect laboratory conditions. Or is the relationship more complicated? It's a bit more complicated but for perfectly understandable reasons. ...
Bob Cross's user avatar
  • 24.4k
7 votes

Minor boost leak and shrill tone at peak boost: hose clamp, gasket or blow off valve?

I Believe It's a Hose Connection Point Unmetered air whether it's a negative pressure or positive pressure is bad. That being said, I find it interesting that losing some of the boost isn't ...
DucatiKiller's user avatar
  • 32.9k
6 votes

what sensors and formula are used to control VGT/VNT turbos?

Dodge installed VNT Turbochargers on cars in 89 and 90. The most well known of which is the 1989 Shelby CSX-VNT. The vanes were controlled by a dual port vacuum actuator. There was nothing ...
rpmerf's user avatar
  • 8,403
6 votes

1997 Subaru WRX STI Type R - Strange and occasional turbo lag

Too long for comment, but I suspect wastegate linkage or door not closing fully due to distortion from heat (it's really hot around there). You could try and get it hot enough to duplicate the ...
SteveRacer's user avatar
  • 12.4k
6 votes
Accepted

Is the procedure for an oil change different for a turbocharged engine?

The process is just the same. The turbo on every engine that I've worked on gets its oil supply from the same system as the rest of the engine.
dlu's user avatar
  • 14.5k
6 votes

Why is it that when supercharging, it's preferred to compress the input, rather than pull a vacuum on the exhaust?

There is no direct path from the intake to the exhaust, at least one set of valves will be closed at all times. The exhaust valves open and the piston pushes the exhaust out of the cylinder, then the ...
GdD's user avatar
  • 17k
5 votes

Turbo Failure Modes (VW TDI VNT15)

Is there any way that the vane actuator could be moving and yet not actually moving the vanes, or is it a positive linkage? There is a positive linkage, but it doesn't mean it isn't working right. ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
5 votes
Accepted

Car suggests shifting gears too early

It is suggesting shifting up early as "it is tuned for economy" - it is not trying to get you to speed quickly. It is trying to be economic with fuel. If you follow the guidance on the dash (remember ...
Rory Alsop's user avatar
  • 18.6k
5 votes

Troubleshooting Low Turbo Boost

Some thoughts on how to verify if you have... an intake obstruction Disconnect the air filter (keep the MAF in place) to expose the compressor inlet and log boost values with the car at idle and ...
Zaid's user avatar
  • 39.2k
5 votes
Accepted

How can I diagnose intermittent low boost on a turbocharged diesel?

Based on what you're stated in the question, it sounds as if your turbo is basically working – so the question is how to figure out what, if anything, is wrong and causing low/absent boost at times. ...
dlu's user avatar
  • 14.5k
5 votes

Remove the body on a Discovery 3 just to replace turbo?

The turbo on the Discovery 3&4 CAN be removed without removing the body, anyone telling you otherwise are simply not a skilled mechanic or are trying to rip you off by charging you for loads and ...
Newbie Noob's user avatar
  • 2,781
5 votes

Oil draining out shortly after turbo hose detached/broke

Don’t drive it, until you have topped up the oil. Then you can get repair it or take it to a mechanic to fit a new pipe. Once those repairs are complete check what is causing the high oil ...
Solar Mike's user avatar
  • 34.6k
4 votes

Turbo equivalent on electric motors

You could capture the heat from the electric motor, and convert that into more energy using a thermoelectric device. University of Florida research
Mobius's user avatar
  • 1,318
4 votes

What exactly is porting a wastegate and what situations would I want to do it in?

Porting your wastegate allows increased flow rates through the gate itself. The gate is a little metal flap (operated by a vacuum operated actuator) that covers a small hole in the rear of the turbo ...
Aaron Lavers's user avatar
  • 1,596
4 votes
Accepted

Will a small engine oil overfill damage the engine or turbo?

It would be hard to give you a definitive answer without access to the engineering data for the engine (unless there are folks out there with real-life experience), but it seems quite unlikely. Half ...
dlu's user avatar
  • 14.5k
4 votes
Accepted

What is the average lifespan of a turbo?

You've asked a general question that has a few too many variables to answer concretely (e.g., type of turbo, application, environment, maintenance schedules, etc.) I'm going to propose a variant of ...
Bob Cross's user avatar
  • 24.4k
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

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