one WG on divided manifold ?
A wastegate can have an effect on power if the wg is too small and cant bypass the proper amount of exhaust the backpressure will go up. If the WG is too small it will also cause boost creep issues. Too large a wg will cause boost too fall off. A lot of wastegate dynamics have to do with the flow of the exhaust and the turbine housing. You can do a lot with a 2in 2' long exhaust. You are oversimplifying.
A tial 38mm or a tial 44mm is more than enough for just about anybody not trying to set records or running more than 5 psi peak boost on any t3 frame turbo, that's all i was saying.
Scorke
if you run different opening pressure for each runner what happens to your backpressure in the manifold and the tuning to compensate....Another good reason for single wastegate is if you have a wastegate fault....If one doesn't open, you're applying massive pressure to two cylinders (1 scroll).....I disagree with it spooling faster with dual gates. I'm sure Ted B can comment on his setup. You will prob lose a little power when the gate opens as the scrolls can bleed over into each other, but it will depend on how long the wastegate pipe is etc...
The divider stops just short of the WG valve face. This is a necessity anyway, or you risk the WG cracking open from the divider enlarging due to thermal expansion. This does not measurably impact the TS effect. When the WG valve opens, each side sees the full WG valve area, because as the valve lifts off its seat, it creates a space between the divider and the valve face. The further the valve is opened, the greater that space becomes. Most of the full potential of the valve flow is realized early in its travel, but it's enough to give more or less full access to both sides.
I built a single gate ts manifold for a car awhile back, this was before Tial MVS's came out. Ran it for awhile on a time attack car. Decided to build a new one, same placement an very similar runner configuration, except flanged for (2) 38mvs's.
not sure if it means anything, was just an interesting comparision...and yes there was a divider all the way to valve.
not sure if it means anything, was just an interesting comparision...and yes there was a divider all the way to valve.
i dont get it. sorry. but if you have 2 gates ''2 runners per gate'' then how would making one gate stiffer then the other be a good thing?
both my W/G's have 22 or 24 ''i forget'' PSI springs in them. i would like a minimum of 28 but i do not think they make springs that stiff.
both my W/G's have 22 or 24 ''i forget'' PSI springs in them. i would like a minimum of 28 but i do not think they make springs that stiff.
Mike
I built a single gate ts manifold for a car awhile back, this was before Tial MVS's came out. Ran it for awhile on a time attack car. Decided to build a new one, same placement an very similar runner configuration, except flanged for (2) 38mvs's.
not sure if it means anything, was just an interesting comparision...and yes there was a divider all the way to valve.
not sure if it means anything, was just an interesting comparision...and yes there was a divider all the way to valve.
solid line is for 2 WG - right ?
Newbie
Joined: Oct 2009
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From: finland
just make sure that the divider is solid and well welded, seen an example where the back pressure differences have shaken it loose and it ended up in the turbo. needless to say that the turbo at full speed didn't like it much.
ouch1
ouch2
anyways the v2 has held up just fine so far, for the tial wg you need to make the divider stick out a bit since the valve is not flush with the vband (obviously)
works fine
if you are using EBC there should be no difference in the spool with 1 or 2 wgs, like stated previously in this post, the flow is the only difference.
ouch1
ouch2
anyways the v2 has held up just fine so far, for the tial wg you need to make the divider stick out a bit since the valve is not flush with the vband (obviously)
works fine
if you are using EBC there should be no difference in the spool with 1 or 2 wgs, like stated previously in this post, the flow is the only difference.
Last edited by lekonna; Feb 5, 2011 at 07:31 AM. Reason: spool dif
Ouch, don't let that happen.
If you scroll down to "T3 EVO Twin Scroll Manifold" here in the galleries section, you can see Drifto's (Morgan Performance Fabrication) divider work:
MP Fab Galleries
Here's a nice photo of the twinscroll turbo w/single WG setup (at left) on BMW's 1.5L 1300bhp F1 engine:
If you scroll down to "T3 EVO Twin Scroll Manifold" here in the galleries section, you can see Drifto's (Morgan Performance Fabrication) divider work:
MP Fab Galleries
Here's a nice photo of the twinscroll turbo w/single WG setup (at left) on BMW's 1.5L 1300bhp F1 engine: