twin scroll turbo on single scroll manifold... ?
11-20-12, 07:57 PM
#1
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twin scroll turbo on single scroll manifold... ?
Alright boys and girls. So I finally installed my single turbo setup and its almost running 100%.
So iam running a hx35 (twin scroll) on a single scroll manifold. And iam debating if I should take the manifold off and weld a plate in the middle to make it a twin scroll.. . I just spent a few hrs on google reading about other peoples setup and they seem to not have any problems... so my question is, is it worth the time and money to do all that performance wise? Its a ***** to get that manifold off and I realy dont feel like pulling it off for an extra 2hp difference. If you know what I mean. Now if I can lower my spool time by 5-600 rpms then maybe maybe lol.. thanks .
Thanks.
Hx35 turbo (new)
Xspower manifold (new design)
Drift motion downpipe
Drift motion 46mm wastegate
So iam running a hx35 (twin scroll) on a single scroll manifold. And iam debating if I should take the manifold off and weld a plate in the middle to make it a twin scroll.. . I just spent a few hrs on google reading about other peoples setup and they seem to not have any problems... so my question is, is it worth the time and money to do all that performance wise? Its a ***** to get that manifold off and I realy dont feel like pulling it off for an extra 2hp difference. If you know what I mean. Now if I can lower my spool time by 5-600 rpms then maybe maybe lol.. thanks .
Thanks.
Hx35 turbo (new)
Xspower manifold (new design)
Drift motion downpipe
Drift motion 46mm wastegate
Last edited by scmaluco; 11-20-12 at 08:25 PM.
11-20-12, 10:29 PM
#2
1. Good luck getting the plate in the right position as the manifold wasn't built for it and from the pictures I've seen (quick google) there is no collector to speak of. So the divider you'd have to weld in will likely be quite convoluted to fit and divide the gases properly.
2. A properly designed, well engineered, twin scroll manifold will have wastegate ports on each side of the divider. Depending on your manifold design, a twin scroll may not be possible. Since I have no reference to what XS is calling their "new design" I can't comment on whether you'd be trying to control boost by only sending gases from one side of the twin scroll through the wastegate. Even with a wastegate port that accesses both sides of the manifold you may have trouble with creep and exhaust pulses will be able to swap sides, negating some of the desired effect.
A (properly designed, well engineered) twin scroll setup will improve spool. However the amount it will improve is not constant and short of it being tested on a system exactly the same as yours (or back to back testing) you will never know how much it improved. I've seen single vs twin scroll comparisons range from negligible spool increase to boost building 600rpm sooner.
2. A properly designed, well engineered, twin scroll manifold will have wastegate ports on each side of the divider. Depending on your manifold design, a twin scroll may not be possible. Since I have no reference to what XS is calling their "new design" I can't comment on whether you'd be trying to control boost by only sending gases from one side of the twin scroll through the wastegate. Even with a wastegate port that accesses both sides of the manifold you may have trouble with creep and exhaust pulses will be able to swap sides, negating some of the desired effect.
A (properly designed, well engineered) twin scroll setup will improve spool. However the amount it will improve is not constant and short of it being tested on a system exactly the same as yours (or back to back testing) you will never know how much it improved. I've seen single vs twin scroll comparisons range from negligible spool increase to boost building 600rpm sooner.
11-21-12, 01:10 AM
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1. Good luck getting the plate in the right position as the manifold wasn't built for it and from the pictures I've seen (quick google) there is no collector to speak of. So the divider you'd have to weld in will likely be quite convoluted to fit and divide the gases properly.
2. A properly designed, well engineered, twin scroll manifold will have wastegate ports on each side of the divider. Depending on your manifold design, a twin scroll may not be possible. Since I have no reference to what XS is calling their "new design" I can't comment on whether you'd be trying to control boost by only sending gases from one side of the twin scroll through the wastegate. Even with a wastegate port that accesses both sides of the manifold you may have trouble with creep and exhaust pulses will be able to swap sides, negating some of the desired effect.
A (properly designed, well engineered) twin scroll setup will improve spool. However the amount it will improve is not constant and short of it being tested on a system exactly the same as yours (or back to back testing) you will never know how much it improved. I've seen single vs twin scroll comparisons range from negligible spool increase to boost building 600rpm sooner.
2. A properly designed, well engineered, twin scroll manifold will have wastegate ports on each side of the divider. Depending on your manifold design, a twin scroll may not be possible. Since I have no reference to what XS is calling their "new design" I can't comment on whether you'd be trying to control boost by only sending gases from one side of the twin scroll through the wastegate. Even with a wastegate port that accesses both sides of the manifold you may have trouble with creep and exhaust pulses will be able to swap sides, negating some of the desired effect.
A (properly designed, well engineered) twin scroll setup will improve spool. However the amount it will improve is not constant and short of it being tested on a system exactly the same as yours (or back to back testing) you will never know how much it improved. I've seen single vs twin scroll comparisons range from negligible spool increase to boost building 600rpm sooner.
case closed
11-22-12, 06:50 PM
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11-22-12, 08:34 PM
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its a 1jzgte, but either way wasn't trying to spend anything over 350 for a manifold. i could've gone with a T4 manifold which had twin scroll and just replaced the flange with a t3.. oh well.
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