Bov And Wastegate

[batherst]

Hey all have just brought a legnum and need to know where to fit the blow off valve? can any one tell me where to fit this and send me some pix of your own? also have a waste gate and need the same advice. cheers

[bradc]

The stock bov is down on the right hand side of the bumper just after the intercooler.

You will need 2 wastegates, one for each turbo

[mpau009]

You can see the stock recirculating valve in this pic, in the location brad mentions.

[Kenneth]

And here is a not so stock BOV in the same place :D

http://www.clubvr4.com/forum/attachment.php?attachmentid=9412&d=1143363571

[You See]

You will need 2 wastegates, one for each turbo
I wouldn't recommend 2 off the standard turbos, as I have done with issues holding boost. Best to plumb it into one. :D

[batherst]

Thanks for the help guys ill give that a shot. Cheers :)

[bernmc]

:thinking: :thinking: :thinking:

It's flippin' amazing I tell you!

(And my mood has nothing to do with the fact that I'm now working day 33 without any time off :|)

[You See]

You trying to tell us something Bern? ...Preddy colours BTW! :p

[Wouter]

Hey Bern.....

If you are feeling stressed you should go see your Doctor!! /haz

[bernmc]

Hey Bern.....

If you are feeling stressed you should go see your Doctor!! /haz

I'm not f*&$ing STRESSED /TTTH /TTTH /TTTH

[valmes]

I wouldn't recommend 2 off the standard turbos, as I have done with issues holding boost. Best to plumb it into one. :D

I've heard it before, but I still can't make sence out of it...

External wastegates can only be placed BEFORE the turbo (if internal one is welded shut) and as I have seen our stock manifolds I just can't figure out where did you bolt/welded them to? Moreover, our stock manifolds are made out of cast iron... :inquisiti Cast iron and steel??? Where did you place them, our manifolds are limited on space? Do you have any photos?

... and in case you did go with custom made SS manifolds - why for stock turbos?

[You See]

I'll post up pics later tonight (if I remember). No I didn't go for customer manifolds....but I will need to if I go away from the standard turbos.

[batherst]

so i wont have any trouble if i plumb it into one? sounds like a mission bt ill give it a shot. i think the bov i got is 25mm........

[valmes]

I'll post up pics later tonight (if I remember). No I didn't go for customer manifolds....but I will need to if I go away from the standard turbos.

I will remind you... /pan

[valmes]

so i wont have any trouble if i plumb it into one? sounds like a mission bt ill give it a shot. i think the bov i got is 25mm........

I think you've got something messed up... Plumbing a BOV is not a mission... it's like 10 min of a deal! :pimp2:

[You See]

ok, here's how mines done (sorry but it's the best I can do..I couldn't get my camera into the tight areas)
First 2 - Back wastegate
Next 2 - Front wastegate
Last - BOV

[valmes]

Thanx... so they are welded onto cast iron manifolds... interesting. :thinking:

[You See]

I'd recommend holding out, do the turbos, manifolds and wastegates at the same time....would be much less complicated.

[batherst]

sorry i was talking about the wastegates. cheeers

[valmes]

I'd recommend holding out, do the turbos, manifolds and wastegates at the same time....would be much less complicated.

I couldn't resist... and did the turbos already ;)

[You See]

TD04's??...Dual wastegates should be fine if it is.

[valmes]

TD04's??...Dual wastegates should be fine if it is.

Nahh... for now I will go with upgraded actuator springs (internal wastegates), but will keep in mind your setup if I have any problems. Although I highly doubt it... Thanx anyway, I didn't think it was possible to weld SS to CI...

[TTV6VR4]

You See, are those still the stock turbos in the pics and what make and size are your wastegates?

[You See]

Yeah stock turbos (at the mo :D) ...wastegates are 38mm XSPower (Tial Style) ..if you're up in AKL feel free to pop around and have a lookie.

[TTV6VR4]

Are both of them atmosphere dumping?, if so what does it sound like, any chance of a sound file?

[Kenneth]

UC, What are you using for boost control?

[batherst]

ok well i now have the bov finally and its looking a little concerning cus of its size check out the link and let me know what u think

http://www.trademe.co.nz/Browse/Listing.aspx?id=52767899

[soapy1978]

what are the idea of waste gates

[Kenneth]

what are the idea of waste gates

Wastegates perform a couple of functions actually.

first off you have to understand how the turbo works (basicly anyway).
Air flows from high pressure to low pressure, if you have high pressure in a bottle, you open the lid and the pressure escapes into the low pressure area.

Because of this movement, if you put a fan in between the high pressure zone and the low pressure zone, the moving air will cause the fan to rotate. this is your turbine.
The faster the air moves, the faster the turbine spins. because the turbine is connected to the compressor, the faster the turbine spins the more air the compressor forces into the engine. If the compressor can flow enough, it makes boost.

A wastegate opens another path between the high pressure zone and the low pressure zone. this means that there is less air moving through the turbine and the turbine doesn't spin so fast.
This regulates boost, as the boost arrives at its pre-determined level the wastegate opens to let bleed the excess pressure and the turbine stays at the correct speed.

An additional use for wastegates is for low pressure turbos, or very small turbos such as the ones in the VR-4.

At high RPM the turbine causes too much restriction for the exaust gasses, causing the turbo to run beyond its designed limits. Aside from possibly damaging the turbo, the compressor can actually flow less air, heat up the air etc. Also, the pressure in the exaust manifold just stacks, making the engine unable to pump as effectively.
Under these conditions the wastegate opening allows more exaust gasses to flow around the turbine and freeing up the engine. You can actually produce more HP this way than trying to run more boost but over-running your turbos.

On an aside, this is actually also what clipping the turbine does.

so:
1) the wastegate regulates boost
2) free up exaust restriction so turbos continue to operate efficiently at high RPM.

[batherst]

well i have attempted to put this in http://www.trademe.co.nz/Trade-Me-Motors/Car-parts-accessories/Performance/Turbos/auction-53415009.htm and it seems there is one to many pipes... any advice????

[Kenneth]

well i have attempted to put this in http://www.trademe.co.nz/Trade-Me-Motors/Car-parts-accessories/Performance/Turbos/auction-53415009.htm and it seems there is one to many pipes... any advice????

standard bypass valve is a recirculating type, the one in your picture is a vent to atmosphere type. you will need to use something to plug the pipe that goes back to the front turbo.

[batherst]

ah, that would explain alot. cheers. so is that the pipe closest to the front or back? and what would i use to block the hole?