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Author Topic: BOV on a TDI  (Read 9389 times)

July 14, 2006, 06:13:11 pm

superman293

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BOV on a TDI
« on: July 14, 2006, 06:13:11 pm »
Is it possible to have a blow off valve on a turbo charged diesel
thanks



Reply #1July 15, 2006, 12:25:33 am

DVST8R

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BOV on a TDI
« Reply #1 on: July 15, 2006, 12:25:33 am »
Anything with enough $$$ is possible, but since the air is not throttled or controlled and when you sundenly let off the throttle just the fuel is reduced, the air flows in the same as always the turbo isn't restricted and doesn't surge (for all you people who like to nit pick, yes I am aware that there is a point with really high PR that a case could be made for one, but anyone who has built a diesel to that point would not be here asking that question). So in this case there is NO point.

If you just want the lame sound, burn it on to a CD and play it to yourself in the car  :roll:
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The Dark Side of Beauty.[/i]

Reply #2November 29, 2006, 04:18:06 pm

Holeshot

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BOV on a TDI
« Reply #2 on: November 29, 2006, 04:18:06 pm »
http://www.bd-power.com/ram/product.php?pn=BD%20TurboGuard&tt=ram

With a manual transmission and decent fueling, you can 'huff' the turbo on every shift.  I can do it with my '94 Ram/Cummins that has an automatic with ease.

Matt
'94 Dodge Ram 2500 4x4 - 12-valve Cummins, NV5600 6spd, SBC Con FE clutch, EDM injectors, etc. ~400rwhp, Isspro EGT/100psi boost gauges

'98 VW NB TDI - not stock by any means, but still pretty tame.  TDI-M candidate :cool:

'00 VW Jetta TDI - wife's 300,000+mi daily driver

Reply #3February 05, 2007, 05:14:35 am

OM617

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BOV on a TDI
« Reply #3 on: February 05, 2007, 05:14:35 am »
Diesels don't need a BOV. Anyone who knows how diesels work will be laughing their butts off at someone with a BOV on their diesel.

Reply #4February 05, 2007, 07:39:22 am

GTD.

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BOV on a TDI
« Reply #4 on: February 05, 2007, 07:39:22 am »
I saw a few ads on Ebay.co.uk for TD/TDI/HDi dumpvalves kits which were basically a very expensive sliver box (housing a change over solinoid I believe) a micro switch, some wires a bit of tube a few fittings and a dumpvalve with T for around £300>. I decided to see if one could be done on the cheap using parts easily found in a scrap yard.

 A mate of mine had a bailey motorsport piston dumpvalve with a t-piece lying around his shed off a petrol turbo project so that was the start of the project.

  Firstly you need a source of vacume as a diesel doesent hve a throttle plate (well except on a ford transit diesel with EGR) simplest way is to use the vacume pump for the brake servo so using a check valve with two take off of an old 88 Golf 1.6 auto im braking I then had my vacume source.

  Now I needed a way of turning this vacume on and off when the throttle comes to rest. I found an EGR switch that fits on the LDA off a Passat TDI, and I also used an EGR solinoid off the same Passat.

 I fitted the LDA mounted EGR switch rigged it to a continuity meter and tested it by pressing and letting go of the accelerator and found it did the opposite of what I wanted, it closed the circuit when the throttle was pressed and opened it when the throttle was at rest.

 So I started wiring and plumbing in the dump valve using a change over relay as a "not gate" by using the normally closed (57a) terminal of the relay

 I once fitted I took it down the road to test it and found although when the the throttle returned to rest the dump valve would open as there was no boost in the pipe operating the dump valve it would be forced open by boost from the turbo resulting in a leak of boost.

 To rectify this I added a second EGR solinoid valve off a VW TDI that was tapped in to the manafold to LDA pipe and connected this to the normally open (57) terminal of the relay the used a T connector to connect the "Vacume" solinoid and the "Boost" solinoid to the dump valve.

 Once again I took it out on the road to test and found it worked, and cost me a few pounds in parts.

[Oo=w=oO]Golf GTD
VW Diesel Mehr Kraft. Weniger Verbrauch, Aus Liebe zum Automobil

Reply #5February 05, 2007, 05:13:01 pm

RabbitJockey

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BOV on a TDI
« Reply #5 on: February 05, 2007, 05:13:01 pm »
this is pretty interesting, could you draw some sort of a circuit to help show what all your creation does, and how it works, it's hard to understand,  heres a little td controller thing i came up with, it's really not that useful, but just to give you an idea of what i am asking for from you

01 Jetta TDI 100% stock daily
81 Rabbit:TDI-M ported head, Frank06 cam, PD intake, hybrid T3 turbo, Renault intercooler, Syl20 11mm pump, light weight fw, and yellow California Clutch clutch kit

Reply #6February 05, 2007, 05:24:00 pm

RabbitJockey

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BOV on a TDI
« Reply #6 on: February 05, 2007, 05:24:00 pm »
also, does it only work when you let competely off the pedal?
01 Jetta TDI 100% stock daily
81 Rabbit:TDI-M ported head, Frank06 cam, PD intake, hybrid T3 turbo, Renault intercooler, Syl20 11mm pump, light weight fw, and yellow California Clutch clutch kit

Reply #7February 05, 2007, 05:52:13 pm

RabbitJockey

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BOV on a TDI
« Reply #7 on: February 05, 2007, 05:52:13 pm »
correct me if i'm wrong but this is your setup here?


01 Jetta TDI 100% stock daily
81 Rabbit:TDI-M ported head, Frank06 cam, PD intake, hybrid T3 turbo, Renault intercooler, Syl20 11mm pump, light weight fw, and yellow California Clutch clutch kit

Reply #8February 05, 2007, 06:02:36 pm

RabbitJockey

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BOV on a TDI
« Reply #8 on: February 05, 2007, 06:02:36 pm »
ok i see why my drawing wouldn't work, it's more or less your first setup, i don't understand what you changed though
01 Jetta TDI 100% stock daily
81 Rabbit:TDI-M ported head, Frank06 cam, PD intake, hybrid T3 turbo, Renault intercooler, Syl20 11mm pump, light weight fw, and yellow California Clutch clutch kit

Reply #9February 05, 2007, 08:06:40 pm

GTD.

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BOV on a TDI
« Reply #9 on: February 05, 2007, 08:06:40 pm »
Plumbing diagram


Wiring diagram

[Oo=w=oO]Golf GTD
VW Diesel Mehr Kraft. Weniger Verbrauch, Aus Liebe zum Automobil

Reply #10February 05, 2007, 09:27:14 pm

RabbitJockey

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« Reply #10 on: February 05, 2007, 09:27:14 pm »
ok i get it now
01 Jetta TDI 100% stock daily
81 Rabbit:TDI-M ported head, Frank06 cam, PD intake, hybrid T3 turbo, Renault intercooler, Syl20 11mm pump, light weight fw, and yellow California Clutch clutch kit

Reply #11February 05, 2007, 09:28:07 pm

RabbitJockey

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« Reply #11 on: February 05, 2007, 09:28:07 pm »
buy  really the vacuum is not needed
01 Jetta TDI 100% stock daily
81 Rabbit:TDI-M ported head, Frank06 cam, PD intake, hybrid T3 turbo, Renault intercooler, Syl20 11mm pump, light weight fw, and yellow California Clutch clutch kit

Reply #12February 05, 2007, 09:48:05 pm

RabbitJockey

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« Reply #12 on: February 05, 2007, 09:48:05 pm »
the thing i still don't get is what is the lda switch on?  and what makes it the lda switch go on and off
01 Jetta TDI 100% stock daily
81 Rabbit:TDI-M ported head, Frank06 cam, PD intake, hybrid T3 turbo, Renault intercooler, Syl20 11mm pump, light weight fw, and yellow California Clutch clutch kit

Reply #13February 06, 2007, 02:59:58 am

GTD.

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« Reply #13 on: February 06, 2007, 02:59:58 am »
Quote
buy really the vacuum is not needed


So whats going to quickly snap open the dump valve?

The pressure of the boost on the piston?

Nope that would would only open a little bit, I didnt loose that much boost with the first version I made, you would end up with a quiet pffffftt noise rather than a PETUSSSSSSH.

Quote
the thing i still don't get is what is the lda switch on? and what makes it the lda switch go on and off


The "LDA" switch is the throttle switch thats mounted on the lda (thinking about it really I should call it a throttle switch or EGR switch) its fitted to EGR equiped cars.


pic "borrowed from one of VWRacer's posts

[Oo=w=oO]Golf GTD
VW Diesel Mehr Kraft. Weniger Verbrauch, Aus Liebe zum Automobil

Reply #14February 06, 2007, 03:39:39 pm

RabbitJockey

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« Reply #14 on: February 06, 2007, 03:39:39 pm »
you don't need vacuum because anytime there is more pressure on in the intake line than in the "signal" line the piston opens, i'm sure the vacuum helps to open it much mroe quickly , but i don't really see it being completely necessary
01 Jetta TDI 100% stock daily
81 Rabbit:TDI-M ported head, Frank06 cam, PD intake, hybrid T3 turbo, Renault intercooler, Syl20 11mm pump, light weight fw, and yellow California Clutch clutch kit

 

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