Questions tagged [boost]

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Corsa 1.7 DTI no Boost at low rpms

I own a Corsa c 1.7 DTI (Isuzu) engine which is having issues with boost. Problem describe: When i start driving from 0 rmp to 2.5 is going very low.. After 2.5 rpms it will start getting as normal, ...
3
votes
0answers
31 views

Boost control using two valves with a vac and boost reference for wide boost control range

Can someone explain how the above boost control setup would work. The valve on the left uses a vac source applied to the top of the diaphram which would effectively help hold the spring closed at high ...
1
vote
1answer
1k views

OEM Boost control solenoid part number?

In my never ending quest to keep my aging 2004 WRX functional, I’ve started to look into my wobbling boost pressures. One suggestion I heard was that, after hundreds of thousands of miles, it’s ...
1
vote
1answer
202 views

Audi TT Turbo and Dump Valve Issue

I've picked up a 1.8 TT Turbo Quattro which has been fitted with a K&N filter and dump valve by the previous owner. My (basic) understanding of how this works is that it should release the air ...
2
votes
2answers
7k views

02 WRX loss of power/boost

2002 US market Subaru WRX with mods from the PO slowly lost boost over the course of a few weeks. I noticed the boost gauge not climbing as high as it usually does under normal conditions. After a ...