Constipated Turbo (Can't Dump)

[Adam_Glanza]

i actually owned one a couple nights ago..

then i woke up in a cold sweat

 

[sdutton007]

i actually owned one a couple nights ago..

then i woke up in a cold sweat

I had a similar dream where i had a starlet that had a working dump valve, tyres with tread, a clutch that wasnt on the way out, and a battery that doesnt die if you turn the light on for more than a millionth of a second. hey anybody wanna buy my starlet lol

^^^looking forward to payday to sort *EVERYTHING* out

 

[Jeffers_21]

i have to ask this just coz it might shake things up a little on the whole hearing wastegate chatter.

ive got an external wastegate on my k26 and you can hear that chatter. although its not in the same way it doesnt happen when ya take your foot off only when its boosting/half boosting. this is becasue the avcr is trying to alter the amount of boost. it make's a kind of wooh wooh whistling noise (not turbo whistle its a lot lower pitch)

so i pose the question could you call this offically waste gate chatter (even tho its not really a chatter type sound lol)

 

[Monkfish]

Not all planes run jet engines

Most planes run conventional engines which are very similar to cars, they work on the exact same principles. One of my closest friends is a plane mechanic and we apply the same principles to our cars

T

True, but the article linked above relates exclusively to jet engines.

Yes, the consequences may be a lot worse when
- your vehicle is a few thousand feet in the air
- has roughly 200 times the power of a starlet
- a few hundred degrees of heat

but whether it is a car or an aircraft, it is not good for the engine, causing it to:-
- heat up
- lose power
- possibly backfire
- put extra stress on the turbo
- force exhaust gasses the wrong way through the engine

i'm sure it will have little effect on a typical starlet, but it will be a lot more major on a 1500BHP skyline or similar!

Correct, it has little effect on a Starlet. A 1500hp Skyline will have a turbo like a dinner plate, so compressor stall WILL kill it. The smaller the turbo, the more it can cope with compressor stall. Compressor stall is caused when the throttle butterfly is closed, the pressure is built up behind it with nowhere to go. This pressure eventually exceeds the pressure the exhaust gasses are putting on the compressor wheels, stalling them. The air in the intake system then flows out of the intake side of the turbo until the gas pressure on the exhaust side overcomes it and spins the turbo. The whole cycle starts again and continues until the throttle butterly is opened again or until there is no more pressure within the intake piping.

Compressor stall has absolutely no effect on the engine at all, but it can damage turbos and/or turbo oil seals/bearings depending on turbo size, driving conditions, driving style, oil type and anything else mechanical that can fail. I have been running with no BOV for the best part of 8 months. I killed a turbo last month, but what caused it's death? I don't know. It's impossible to say as there are so many forces and factors that determine a turbo's life span. It was also second hand, so I don't know what abuse (if any) it had before I fitted it.

Again, in conclusion. Compressor stall. It MAY damage your turbo, it MAY not, but when talking about cars it has no relevence what-so-ever about compressor stall in a jet engine.

i have to ask this just coz it might shake things up a little on the whole hearing wastegate chatter.

ive got an external wastegate on my k26 and you can hear that chatter. although its not in the same way it doesnt happen when ya take your foot off only when its boosting/half boosting. this is becasue the avcr is trying to alter the amount of boost. it make's a kind of wooh wooh whistling noise (not turbo whistle its a lot lower pitch)

so i pose the question could you call this offically waste gate chatter (even tho its not really a chatter type sound lol)

No, the noise you are hearing is just pitch change in the air being released by the wastegate, which as you correctly stated, is the AVCR adjusting the wastegate. Is is not chatter.

That is all