are these dueal wastegates? If so is there a point to having two?





https://www.nopistons.com/forums/upl...1063918268.jpg

lmfao. That's dual BOV(blow off Valves) Wastegates connect to the exhaust manifold between the engine and the turbo.

or are those blow of valves.... https://www.nopistons.com/forums/pub...1047683358.gif *feels like an idiot*

damn you jspecracer7 ^^ you posted a second before I did..... I though they were blow off valves but... yeah I need to shut up.



is there any point in having dual bov's?

Dun think so. Seems pretty pointless to me.

Depends on the CFM of the turbo, I have seen the makings of twin Greddy Type R BOV's on someone CYM FD 20b project with a T-76 on it, but I can't say who it is yet :P

This is dual wastegates https://www.nopistons.com/forums/pub...#>/biggrin.png

I use dual Tial HP 35 mm wastegates and one BOV , I may go yo dual BOV,s also. https://www.nopistons.com/forums/pub...#>/biggrin.png

is there any point to 2 wastegates? why not just get 1 good one, will certainly be cheaper.

Reasons for dual wastegates are :

1 For me both valves were cheaper than one large one.

2 Because of the size of my turbo I "designed" my set up for the quickest spool , so I did a custom tubular header with 2" id runners, and a wastegate for each runner , so as to avoid exhaust pulses interacting and WEAKENING each other.

3 They will out flow one large one , so I should be able to use them for any turbo in the future.

4 they just look F@##kin BAD ASS !!!! https://www.nopistons.com/forums/pub...#>/biggrin.png https://www.nopistons.com/forums/pub...IR#>/wacko.png

There was a discussion on the Dual wastegate set up on the EVIL forum , what was said is , in order to use a single WG on two runners , there needed to be the "Y" piece to which the WG is attached , this "Y" piece is also connected to both runners so that exhaust gas from both rotors can be vented. But what actually happens when the gate is closed is a migration of pulses back and forth from rotor to rotor causing interference which results in (exhaust gas) power and velocity losses which could / would affect spool up negatively.

To have a truly divided system , there needs to separate gates to prevent the above phenomena from occurring.

Marcell thinks too much! https://www.nopistons.com/forums/pub...#>/biggrin.png https://www.nopistons.com/forums/pub...IR#>/bigok.gif



2 TiAL 35mm cost less and flow more than 1 TiAL 46mm though.

so if you have a 20b it would be smart to have 3 wastegates?

Si

No with a 20B you need not worry with all that for two reasons

1 . A 20 B has three exhaust ports and a devided turbo has two inlet ports , three cannot go into two without joining first , this is why most use non divided , single entry exhaust housings.

2 A 20B would have no trouble spooling a windmill because of the high volume of exhaust gas !! , there is no need to attempt to keep pulses separate and all that , all you would need is a large enough gate to handle the flow. https://www.nopistons.com/forums/pub...IR#>/smile.png

https://www.nopistons.com/forums/pub...withstupid.gif



DuMaurier is correct as usual from what I've seen.

If you had 3 turbos, YES! https://www.nopistons.com/forums/pub...#>/biggrin.png

I think the big problem here is that people tend to get caught up in this bigger is better kinda thing and it isn't necessarily the right way to go, you would only need a very large wastegate if you are trying to maintain low levels of boost think of it this way the wastegates job is to modulate flow to the turbo, so if too much is going by the turbo it will have a harder time reaching higher levels, I think rather than so much emphasis being placed on the size of the wastegate, more should be placed on the flow through the wastegate.However with that being said there are many other variables that need to be taken into account.



-Sean