IS A BOV MORE IMPORTANT ON A HYBRID TURBOCHARGER

advantage101

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Hi Folks

I had an exchange or two with members of a different forum about have a Blow off valve fitted to my car.

A chap who seemed to have done extensive research on the matter and even spoken to a manufacturer of BOV's concluded that the UP GTI already has an inbuilt devise which adequately performs this function and that adding an aftermarket BOV is not necessary!

I am swapping the turbocharger to an aftermarket Hybrid using an OEM housing with upgraded internals.

My question now is whether this new turbo would necessitate a BOV for maximum performance??

I look forward to hearing from you.

Cheers
Michael
 

obi_waynne

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The VW ECU's generally have a big problem with atmospheric dump valves (BOVs) they tend to run rich and are prone to throw error codes or enter limp home mode (Bosh ECU are more fussy than the Siemens ECU's but both complain)

The turbo should come with a bypass controller and it's important to have the right "spring rate" on this for the power of the turbo. The stock N75's are generally quite weak and only suitable for a stock turbo, an N85 was the VW solution for larger turbos but there are better aftermarket units around.

Some members have used partially venting ones, but to be honest the VAG design keeps the turbo spooling up by dumping the pressurised air into the intake so you'll lose throttle response with anything other than a recirculating valve.
 

advantage101

Newbie
Points
1
Location
LEEDS
Car
VW UP GTI
The VW ECU's generally have a big problem with atmospheric dump valves (BOVs) they tend to run rich and are prone to throw error codes or enter limp home mode (Bosh ECU are more fussy than the Siemens ECU's but both complain)

The turbo should come with a bypass controller and it's important to have the right "spring rate" on this for the power of the turbo. The stock N75's are generally quite weak and only suitable for a stock turbo, an N85 was the VW solution for larger turbos but there are better aftermarket units around.

Some members have used partially venting ones, but to be honest the VAG design keeps the turbo spooling up by dumping the pressurised air into the intake so you'll lose throttle response with anything other than a recirculating valve.

Hi Obi Waynne

Many thanks for taking the time to respond to my question.

TBH this area of tuning is quite new to me and more technical than the other parts of my project, so I am a bit out of my comfort / knowledge zone!

I am planning to use an aftermarket ECU such as a Motec unit so this may have a bearing on some of the points raised in your response. I haven't looked into the Bypass Contoller of the new turbo but will do so now.

Is it possible for you to point me to a suitable recirculating valve please? Or point me in the general direction?

Cheers
Michael
 

obi_waynne

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What engine and year is your car and which turbo are you looking at and I'll see if I can dig up any more technical information for you. Most of my expertise lies with the early K03 and K04 era engines, but I'm sure I can help point you in the right direction.
 

advantage101

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Hi there

Thanks again.

My engine code is DKRA 10.L TSI engine standard on my 2019 VW UP GTI Reg number NV68 HHR.

The engine part of my project includes upgraded forged internals, engine balancing & modified cylinder head.

The turbo I have purchased is in the link below.


Cheers
Michael
 

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