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Vband vs T4 twin scroll manifolds/turbine housings

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turbotalon1g

15+ Year Contributor
1,076
38
Oct 19, 2005
Blaine, Minnesota
Just want to read some technical information and this would be a good help to me as I look to get away from stock frame turbos.

I'm looking to start with a 62mm but who knows where I'll go from there.

Anywho, I'm curious on the performance of vband turbine housings and manifolds vs T4 twin scroll.

Pros and cons of each.

Thanks, hope this produces some good discussion.

Aaron
 
Let's not include that as it seems to not be a popular option/turbo offering **edit**

I should say it is an option that I hav not seen used as much as the open v band.
 
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im pretty sure the big benefit to the vband stuff was to make it a compact package while getting the best potential of the appropriate size housing for the turbo while dropping a little weight as well. the perks of twin scroll housings are the better spool rate while being able to still make good power up top. theres more to them but thats kind of a simplified answer. basically the housing/ manifold you go with will ultimately depend on your end goals. i feel the best advice will probably come from the morrisons @MorrisonFab. theyre both very knowledgeable on both housings i believe and can help you figure out what combo is going to best suit your needs.
 
well thats a first for me............doesnt seem like that would flow as well as the standard twin scroll T3 flange.........gotta wonder

thx for the link
 
Has anyone seen logs or Dyno charts aka data showing performance or spool of vband vs T4 twin scroll?
 
From what I understand, the v-band was created for convenience because you don't have a gasket to blow out or bolts to seize-up or strip. I'm not aware of any performance gains. I could be wrong, though.
 
From what I understand, the v-band was created for convenience because you don't have a gasket to blow out or bolts to seize-up or strip. I'm not aware of any performance gains. I could be wrong, though.
i could be wrong but from what i gathered on the vband it should spool about the same as an open t3 just in a smaller package. its kind of comparing apples to oranges. depends on the application on what route to go with.
 
I run a T-4 twin scroll, I haven't tried running an open one due to wanting the quicker spool of the twin scroll, so nothing to compare it to from me just from what I'm running.
 
On a 62mm I would definitely run a V band housing, The Tial v band is an amazing housing. Very compact, light and stainless steal, not iron. I only see 1.2:1 back pressure on a maxed out 62mm with a Tial v band .82 and have no problem putting the car on the converter with out nitrous. On a much larger framed turbo I would consider the much heavier and bulky twin scroll if spool mattered.
 
im pretty sure the big benefit to the vband stuff was to make it a compact package while getting the best potential of the appropriate size housing for the turbo while dropping a little weight as well. the perks of twin scroll housings are the better spool rate while being able to still make good power up top. theres more to them but thats kind of a simplified answer. basically the housing/ manifold you go with will ultimately depend on your end goals. i feel the best advice will probably come from the morrisons @MorrisonFab. theyre both very knowledgeable on both housings i believe and can help you figure out what combo is going to best suit your needs.

We agree with all of this and appreciate the kind words!

Like @OH91awd said, it can be expected to act like any open turbine housing, but with more compact dimensions. We really like being able to take advantage of those dimensions with a better placement which can lead to a better overall working system (such as opening up the downpipe bend, for example). Not needing a gasket can be very beneficial in a road race environment where the turbine housing inlet gasket becomes a failure point. Having some leeway in clocking and orientation can be handy as well. This applies to v-band housings in general.

Although things get muddy when trying to compare open vs divided directly, such as a required A/R change etc, an open turbine housing will generally make a higher peak power number, and a divided setup will be more responsive and generally have more area under the power curve on a 4 or 6 cylinder application where the divided/paired runners can keep the cylinders during overlap separate. Divided and open setups each have their strengths in different applications.

On a 62mm I would definitely run a V band housing, The Tial v band is an amazing housing. Very compact, light and stainless steal, not iron. I only see 1.2:1 back pressure on a maxed out 62mm with a Tial v band .82 and have no problem putting the car on the converter with out nitrous. On a much larger framed turbo I would consider the much heavier and bulky twin scroll if spool mattered.

This is a perfect example where the setup matches the intended use. The combination is well thought out- being able to get under power quickly enough to easily straddle the line of traction and the rpm range stays right where it shines while going down the track.
We really love working with the TiAL housings and the engineering that goes into them. As fabricators because each dimensional aspect is refined and pushed as far as it can, making them more compact (giving more room for everything else fighting for space in a DSM engine bay) than any other comparable v-band housing we've come across. Being investment cast gives an exceptional surface finish and accuracy not only on the outside, but in the volute where exhaust velocity is extremely high, and stainless steel that has a lower thermal conductivity to deliver more heat to the turbine wheel. We've always been a little sad that their housing choices lack divided options, but they truly have the v-band stuff nailed down!

Cheers,
Matt and Samantha
 
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