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Questions tagged [turbocharger]

A forced induction device that increases an engine's power output and efficiency. It's consists of a turbine, driven by the engine's exhaust, coupled to an impeller which compresses and forces air into the engine. More air (= more oxygen molecules) + more fuel = More power

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3answers
12k views

Static vs. Effective compression: Why does higher effective compression not require higher octane gas?

Background I've been trying to do a lot of research on boost lately because I'm planning on running a moderate turbo setup on my daily/light-duty-autox car in the future. I'm trying to get into the ...
22
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2answers
13k views

Why do we need to cool air after it leaves a turbocharger?

When we are using a turbocharger to compress the incoming air, the air gets hotter. Usually this hot air is cooled by using an intercooler before it's passed to the engine. What is the reason behind ...
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4answers
87k views

Why does a Turbocharger only produce boost when the engine is under load?

Why does a turbocharged car only produce significant boost whilst the engine is under load? Is is something to do with how much exhaust is being produced or is there some kind of valve mechanism that ...
16
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2answers
3k views

What is an A/R ratio?

I heard the term A/R ratio today while watching a video about turbochargers. What does the term A/R ratio mean? Does it just apply to turbos? If not, what else does it apply to? How is it computed? ...
16
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2answers
10k views

What happens to a car when it hasn't been driven for 12 years?

I'm hoping that I'll soon be the owner of 2l turbo charged, 4wd hatchback that's been sat in a garage, undriven for over a decade. Trouble is that I won't be able to give it a full inspection until I ...
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6answers
5k views

Turbo equivalent on electric motors

Is there anything functionally equivalent to a turbo for electric motors? Obviously, I am not asking for something that reuses exhaust gases to force in more air, because there are no exhaust gases ...
13
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6answers
3k views

How to deal with a hot turbocharger

A piece of advice that seems to be widely accepted is that after a long high-speed run, when the turbocharger is thoroughly hot, you should let the engine idle for a while before stopping it. The ...
12
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1answer
840 views

What are the various causes of preignition / detonation?

A search on detonation produced some of the causes of detonation, but everything I found says there are other causes, but none list them. The most common listed cause is the air / fuel mixture ...
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3answers
61k views

What is overboost?

I've heard the term overboost quite a lot. What is "bad" overboost? What is an overboost problem? What will happen to my turbo engine if I don't fix it? Edit: apparently there is a good type ...
10
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3answers
2k views

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

Vehicle in question: 2004 Subaru WRX wagon. This weekend, I replaced the intercooler hose (y-shaped upset the intercooler), the throttle body hose and the blowoff valve hose (routes the over boost ...
10
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1answer
712 views

My subaru legacy will not boost

I drive a Subaru Legacy Turbocharged GT 2008 model with an EJ20 engine. When I press hard on the acceleration to boost the tachometer upon reaching 4-5 thousand RPM's it starts jerking and there is ...
9
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2answers
35k views

What is the function of a blow-off valve vs a wastegate?

I am waiting for a 2013 STI and have been looking into upping the performance, but before I go down that road I would like to thoroughly understand the components in a forced induction vehicle. I've ...
9
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3answers
48k views

Do you really need to cool down your turbo after hard driving? [duplicate]

Vehicle: 2012 Subaru Sti I have been driving turbocharged cars for a while now and I have blatantly accepted that before shutting down you must let your car idle for a few minutes after driving hard ...
9
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2answers
3k views

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

I want to fit a variable geometry turbo to my car. Its vanes are usually controlled an electrical actuator (otherwise sometimes it's on vacuum). What information is used to to inform the state of the ...
9
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2answers
4k views

Troubleshooting Low Turbo Boost

I'm starting to suspect that the smoke and low power (I'm pretty sure it is not "limp mode" just a lack of enthusiasm) I'm seeing in our 2002 Jetta TDI (ALH engine with Garret VNT-15 turbocharger) may ...
8
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3answers
25k views

Turbo losing boost at around 4000 rpm

I have a 2005 Opel Astra Turbo Coupe. I would imagine most of you guys are more familiar with the Vauxhall or Holden badge, but it's the same car with the same Z20LET Turbo Ecotec engine. Anyways, ...
8
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2answers
2k views

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

This question got me thinking: if you were to install a turbocharger on an engine, is there a straightforward relationship between the boost pressure and the amount of power you can expect? For ...
8
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2answers
987 views

How does a supercharger differ from a turbocharger?

What is the difference between superchargers and turbochargers? I looked it up before but I really don't understand what the difference is.
8
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1answer
381 views

Is it possible to extend the length of the shaft on an existing turbocharger, further distancing the compressor from the turbine?

I'm toying with turbojet engine ideas, and over the course of my research it occurred to me that the combustion chamber could be more power-efficient and space-efficient if it was aligned in the ...
7
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1answer
3k views

Why no exhaust gas turbine generator in hybrid vehicles?

I found something interesting on Wikipedia today: a hybrid turbocharger. This is a device that charges a battery with an exhaust gas turbine, and at the same time operates an air compressor using the ...
7
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2answers
2k views

Would a non-turbo diesel perform better in high altitudes than a comparable gasoline engine?

I live close to the Rocky Mountains and drive into them quite often. I have a small naturally-aspirated four-banger that tends to lose a very noticeable amount of power getting into the higher ...
7
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2answers
3k views

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

When driving around 120/140 kmph and applying max gas, normally the force/torque can be really felt from the turbo. However sometimes its just not there / no extra pull, also the consumption meter ...
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4answers
4k views

2002 Ford F350 Superduty 7.3L Turbo diesel using a quart of oil every 43 miles

This Diesel engine has been rebuilt and it didn't use any oil till the HPOP went out. I replaced the oil pump and then I noticed my turbo when going up a hill and the Turbo would sound like a sneeze ...
7
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4answers
6k views

Does limiting the use of a vehicle's turbocharger improve fuel economy?

I have heard that when a turbocharger is being used it will cause the fuel economy of your car to drop. Without thinking about techniques to improve fuel economy in general, how does a driver ...
7
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1answer
1k views

SAAB 9-5 wagon throws P1549 Code (Boost control valve)

I called an ASE-certified mechanic. He charged some $60 for the visit and $60 diagnosis and really he didn't quite spot on anything. Left me where I was - work-wise , diagnosis-wise and knowledge-...
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6answers
1k views

Oil draining out shortly after turbo hose detached/broke

My car is a VW Golf 5 1.9 TDI (77 kw), year 2005. Problem: Turbo hose broke Yesterday while driving on the highway with a speed of around 130-140 km/h I noticed a sound from the engine which was ...
6
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2answers
2k views

Petrol vehicles, what are the advantages and disadvantages of a turbo charger?

Diesel vehicle often use turbo chargers. Petrol vehicles frequently do not. What are the advantages and disadvantages of using a turbo charger on a petrol engine?
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1answer
1k views

Shop replaced engine, blew about six weeks later

A local repair shop recently replaced the engine in my 06 Pontiac Solstice. They obtained a used engine from LKQ. I'm not sure how many miles the replacement engine had (unfortunately). Wednesday ...
6
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4answers
10k views

Troubleshooting low boost pressure

A Tata with a Quadrajet BS IV (90 ps) diesel engine was brought in for low power. When starting the engine in a no load condition the turbo boost pressure is 950 mBar. When the engine accelerates the ...
6
votes
1answer
5k views

Ford Fiesta 1.4 TDCi Oil Leak

I have a Ford Fiesta 1.4 TDCi 2006 model and I recently did a head gasket change. Now there is a oil leak from the engine, behind the turbo, i cant seem to find the source, but it looks bad. Can ...
5
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2answers
4k views

BMW 330D 2001 E46 Turbo Charger not working as expected after changing

I have a problem with my car. My car: BMW 330D, 135kw, 2001 year, E46. A week ago my turbo charger got broken when I was driving. There was a lot of white smoke going out of exhaust and there was no ...
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4answers
2k views

Is it feasible to Turbo a NA engine while maintaining 87 AKI octane fuel use?

I have a Honda Civic with a naturally-aspirated Honda D17A2 (9.9:1 compression ratio). Goal: I want a modest horsepower gain (say +38 hp) in the lower-mid-range powerband; I'm not after the maximum ...
5
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1answer
151 views

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

After a longer drive (45 minutes on highway) my turbo is spooling but not putting power to the tires. The revs just kinda bounce there like it's hitting a limiter but it's only around 5k rpm. This ...
5
votes
1answer
1k views

Car suggests shifting gears too early [closed]

I own a 2014 Volkswagen Passat 2.0 TDI Bluemotion. It is a 6 speed manual transmission. I understand that it is a car tuned for economy. But it still asks me to shift too early. For example if I'm at ...
5
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2answers
2k views

Turbo Failure Modes (VW TDI VNT15)

The turbo output in our 2002 VW Jetta TDI has dropped way off. Pulling the turbo out seems like a serious piece of work, so I'd like to be pretty confident that it has failed before I pull it. So I'm ...
5
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2answers
3k views

2006 Audi A4 2.0T, No passing power

I have a 2006 Audi A4 2.0T Turbo Tiptronic Automatic that has no passing power. When I step on the accelerator the car will shift down into a lower gear, rev about 3500 RPMs but will not shift up ...
5
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1answer
423 views

Solstice - Can an exhaust leak cause (really bad) hesitation?

My Solstice says "hi everyone." Moving on. I've had some really rough starting over the past month or so. I hadn't had time to really look at it until a few days ago, when I noticed the downstream O2 ...
5
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0answers
759 views

How to test if turbo is properly working in a 2006 Forester XT

I recently had my Forester engine serviced and afterwards it didn't feel like I was getting boost and was getting a whirring/spinning noise while throttling. I brought it back and they realized they ...
4
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3answers
2k views

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

I am planning to add a 12V DC blower (https://www.amazon.in/gp/product/B00LPUXVWS) to intake manifold of my Yamaha FZS FI 149CC engine. I thought it could work more like a supercharger, except it will ...
4
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2answers
9k views

Why do Subarus run so rich under boost

This isn't a general question regarding air/fuel ratios. I want to know why Subaru specifically insists on making their cars run ridiculously rich under boost. For instance, my 2007 Forester XT has an ...
4
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2answers
3k views

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

I recently upgraded my ride to a 2011 Taurus SHO. I usually try to change the oil as soon as possible after a vehicle purchase, just to be safe. I'm not used to turbo cars, as this is my first, so I ...
4
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2answers
23k views

Audi A4 2007 2.0T boosts but poor performance, fuel economy

My 80,000 mile 2.0TFSI Turbo Audi has lost a lot of performance but produces no check-engine-light (CEL) or codes. One month ago an independent garage looked at it and did $2200 of work including ...
4
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3answers
6k views

High Octane petrol's effect on turbos

I have a 2001 SAAB 9-3. I was told that I should use a high octane fuel...that it would extend the life of the turbo. Is this true?
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2answers
2k views

Forced induction and engine braking

So does forced induction negate the effect of engine braking on compression motors? For example, going down an incline, drop into 3rd (automatic) to get some engine braking going. With my new Chevy ...
4
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1answer
332 views

What is better for sparkplugs, inconel super alloy or iridium?

I am buying new sparkplugs for my 2006 Volkswagen Passat 2.0T and i purchased pulstar be1h10 sparkplugs with a plasma core, but i am now being told that they are not good for my car because they arent ...
4
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1answer
8k views

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

I own Suzuki Swift diesel, the engine is 1248cc Fiat sourced diesel engine with a small FGT turbocharger. I overfilled the engine with about 1/2 litre too much engine oil and drove at high speeds on ...
4
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3answers
3k views

Could a vacuum valve be responsible for a P1110 code on 2001 Saab 9-5 2.3T with check engine light on?

All of my monitors are in ready mode, only a P1110 code left, for which I have installed booster pipe O-ring, new booster valve or hooter valve, my only culprit left is the vacuum valve on firewall, ...
4
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3answers
5k views

Second burst ancillary hose on Z20LET engine

This morning was the second time the same ancillary coolant hose burst in my car. It's a 2005 model Opel/Vauxhall Astra turbo coupe (engine is Z20LET). Prior to this, I have had many problems with ...
3
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3answers
2k views

Replace whole turbocharger or only the waste-gate actuator?

I have an Opel Astra H Caravan 2008 1.7 CDTI 81kW (type 0035/AHO). I started having some problems with the turbocharger. After reaching a certain velocity on the highway the car suddenly loses power ...
3
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3answers
935 views

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

For example, we have a 2008 Hyundai Accent. In Turkey, it is called "Accent Era". Is it possible to install twin borgwarner turbochargers from two trucks and a supercharger from a Shelby GT500? The ...