HTA 35R really worth it?
I found out today we have two FR twin scroll headers at the shop. The other is the same way but the actual head flange has been changed to have a slight "transition" machined into it, still has an abrupt change in size from the head port to the runner dimensions.
Equal length runners is not a goal unto itself. More accurately, the runners should have equal pressure drop.
This will balance the reversion equally across all four cylinders.
Although it should be said that if you have roughly the same number & acuteness of bends in all four runners, then making them equal length will result in roughly equal pressure drop.
If we were talking about helmholtz tuned runners, they'd have to be a LOT longer than what is typically used on turbo manifolds in order to be have a useful resonance. And these tuned runners will carry drawbacks of their own--additional volume, more heat loss, more pressure drop, less structural integrity... all are bad things in the context of turbo manifold design.
This will balance the reversion equally across all four cylinders.
Although it should be said that if you have roughly the same number & acuteness of bends in all four runners, then making them equal length will result in roughly equal pressure drop.
If we were talking about helmholtz tuned runners, they'd have to be a LOT longer than what is typically used on turbo manifolds in order to be have a useful resonance. And these tuned runners will carry drawbacks of their own--additional volume, more heat loss, more pressure drop, less structural integrity... all are bad things in the context of turbo manifold design.
Equal length runners is not a goal unto itself. More accurately, the runners should have equal pressure drop.
This will balance the reversion equally across all four cylinders.
Although it should be said that if you have roughly the same number & acuteness of bends in all four runners, then making them equal length will result in roughly equal pressure drop.
If we were talking about helmholtz tuned runners, they'd have to be a LOT longer than what is typically used on turbo manifolds in order to be have a useful resonance. And these tuned runners will carry drawbacks of their own--additional volume, more heat loss, more pressure drop, less structural integrity... all are bad things in the context of turbo manifold design.
This will balance the reversion equally across all four cylinders.
Although it should be said that if you have roughly the same number & acuteness of bends in all four runners, then making them equal length will result in roughly equal pressure drop.
If we were talking about helmholtz tuned runners, they'd have to be a LOT longer than what is typically used on turbo manifolds in order to be have a useful resonance. And these tuned runners will carry drawbacks of their own--additional volume, more heat loss, more pressure drop, less structural integrity... all are bad things in the context of turbo manifold design.
scorke,
the ams kit uses a .63 hotside.
the HTA is a .82 turbo. That is where your added topend power came.
I really cant believe this wasn't brought up already. HTA is topend like a .82 and spool like a .63. AMS kids have always spooled so great because of the backside.
the ams kit uses a .63 hotside.
the HTA is a .82 turbo. That is where your added topend power came.
I really cant believe this wasn't brought up already. HTA is topend like a .82 and spool like a .63. AMS kids have always spooled so great because of the backside.
Ted B said it the best. runner design and size is a calculated process. same with the intake manifolds out there. u cant just expect to put the largest size runners imaginable and expect to make the most power.
scorke,
the ams kit uses a .63 hotside.
the HTA is a .82 turbo. That is where your added topend power came.
I really cant believe this wasn't brought up already. HTA is topend like a .82 and spool like a .63. AMS kids have always spooled so great because of the backside.
the ams kit uses a .63 hotside.
the HTA is a .82 turbo. That is where your added topend power came.
I really cant believe this wasn't brought up already. HTA is topend like a .82 and spool like a .63. AMS kids have always spooled so great because of the backside.
Scorke
did you guys miss the boat where ams kits were .63's? They tested the .63 to make about the same power as the .82 and spool much better.
That combined with their header design is why they have spooled so well.
Their test isn't ridiculous its what it is. A ams kit vs a ams kit with the new hta turbo. They hta proves to spool like a .63 with a .82 backside.
That combined with their header design is why they have spooled so well.
Their test isn't ridiculous its what it is. A ams kit vs a ams kit with the new hta turbo. They hta proves to spool like a .63 with a .82 backside.
did you guys miss the boat where ams kits were .63's? They tested the .63 to make about the same power as the .82 and spool much better.
That combined with their header design is why they have spooled so well.
Their test isn't ridiculous its what it is. A ams kit vs a ams kit with the new hta turbo. They hta proves to spool like a .63 with a .82 backside.
That combined with their header design is why they have spooled so well.
Their test isn't ridiculous its what it is. A ams kit vs a ams kit with the new hta turbo. They hta proves to spool like a .63 with a .82 backside.
Scorke
Evolved Member
Joined: Oct 2002
Posts: 2,788
Likes: 1
did you guys miss the boat where ams kits were .63's? They tested the .63 to make about the same power as the .82 and spool much better.
That combined with their header design is why they have spooled so well.
Their test isn't ridiculous its what it is. A ams kit vs a ams kit with the new hta turbo. They hta proves to spool like a .63 with a .82 backside.
That combined with their header design is why they have spooled so well.
Their test isn't ridiculous its what it is. A ams kit vs a ams kit with the new hta turbo. They hta proves to spool like a .63 with a .82 backside.
There will probably never be a hta 35R and 40R twin scroll test, ever.
Scorke
Why wont there ever be a comparison you think? well i want something for the street but i like the power of the 40....people say that the 40 will spool around 5500 and the 35r around 4800. i think the 5500 is a little too laggy, but it can make closer to 700whp.