[Impulse20098]

Originally Posted by Mapper

weary when the description states.
"Our engineers utilized transient flow analysis and flow bench testing to optimize the twin scroll turbine housing, while maintaining stock fitnent " ...

Twin scroll housing? How? S58 turbos are Mono scroll.

I read the description and thought the same thing lol. Details matter to me. Even if it is only the description of an item.

[SwankPeRFection]

Originally Posted by Impulse20098

I read the description and thought the same thing lol. Details matter to me. Even if it is only the description of an item.

Look, if you want a discount too, just be up front about it and ask. You don’t need to beat around the bush… 😂

[Mapper]

Originally Posted by SwankPeRFection

Look, if you want a discount too, just be up front about it and ask. You don’t need to beat around the bush… 😂

Hahaha right?!

[Vectors2final]

I dunno about this one…

IIRC, CTS had a lot of QA/QC issues in their VAG offerings.

[mike@x-ph.com]

Originally Posted by Vectors2final

I dunno about this one…

IIRC, CTS had a lot of QA/QC issues in their VAG offerings.

So far it looks good with zero complaints, we'll have to review in 6 months to 1 year.

[Vectors2final]

That's good to hear!

Given the price point, I gather it won't take too long for the feedback to come rolling in.

[mike@x-ph.com]

Originally Posted by Vectors2final

That's good to hear!

Given the price point, I gather it won't take too long for the feedback to come rolling in.

I agree; their turbos for the older BMW platform are top sellers. I'm sure it won't be different with this kit.

[Allerum]

I mean, you could do a twin scroll twin setup but you would need a new manifold design.

[SwankPeRFection]

Originally Posted by Allerum

I mean, you could do a twin scroll twin setup but you would need a new manifold design.

Ain’t gonna happen. You can’t do twin scroll with 3 cylinders. You could do a twin scroll big single though with a nice Garrett G35-900 and have a really nice response street setup.

[Allerum]

Originally Posted by SwankPeRFection

Ain’t gonna happen. You can’t do twin scroll with 3 cylinders. You could do a twin scroll big single though with a nice Garrett G35-900 and have a really nice response street setup.

You can do a twin scroll it would need a manifold. I'd prefer a single twin scroll anyway bit I'd only want a low mount 700hp ish.

[SwankPeRFection]

Originally Posted by Allerum

You can do a twin scroll it would need a manifold. I'd prefer a single twin scroll anyway bit I'd only want a low mount 700hp ish.

Show me a twin scroll twin turbo manifold on an inline 6.

[Scoobaru]

Originally Posted by SwankPeRFection

Show me a twin scroll twin turbo manifold on an inline 6.

Here you go, fitted to a Nissan GTR RB26 engine -




https://www.sincocustoms.com/shop/pr...riantId=956355

[SwankPeRFection]

Originally Posted by Scoobaru

Here you go, fitted to a Nissan GTR RB26 engine -




https://www.sincocustoms.com/shop/pr...riantId=956355

You may want to go read what that other guy wrote and what I wrote and what I asked for. Everyone knows you can do twin scroll SINGLE. He said you can do twin scroll TWINS on this engine with a different manifold, which you cannot. Ain’t gonna happen, that’s why I asked for him to show me.

[Mapper]

Originally Posted by Allerum

I mean, you could do a twin scroll twin setup but you would need a new manifold design.

No, not possible.
You need even nunber of cylinders for twin scroll to work.
Try making 3 cyliners work with two channels in the diagram below.
Two, four, six, eight! Who do we appreciate?

[Mapper]

Originally Posted by Scoobaru

Here you go, fitted to a Nissan GTR RB26 engine -




https://www.sincocustoms.com/shop/pr...riantId=956355

That's nice, but not what was claimed and discussed.

[Mapper]

Originally Posted by SwankPeRFection

You may want to go read what that other guy wrote and what I wrote and what I asked for. Everyone knows you can do twin scroll SINGLE. He said you can do twin scroll TWINS on this engine with a different manifold, which you cannot. Ain’t gonna happen, that’s why I asked for him to show me.

I dont get it. Shrug.

[SwankPeRFection]

Originally Posted by Mapper

I dont get it. Shrug.

Yeah, I don’t think he knows what he’s talking about. Maybe he was thinking twin scroll single and incorrectly expressed himself. The S58 might as well be an old school Supra in terms of what setups to run. That’s kinda why I like the new engines all of a sudden. Ironically, it’s a bit of a cross between the 2JZGTE and the RB26DETT because for xdrive cars it uses that same oil pan passthrough design for the front drive axle like the RB did. I feel nostalgic every time I stare at this new generation engine from BMW.

Anyway, back on topic… would love to see some dyno runs with these twins and see what they do. I feel like everyone is so hung up on singles now for roll racing it would be awesome to see more response setups for like time attack or normal street/road race track setups.

[Allerum]

Originally Posted by Mapper

No, not possible.
You need even nunber of cylinders for twin scroll to work.
Try making 3 cyliners work with two channels in the diagram below.
Two, four, six, eight! Who do we appreciate?

Cylinders 1 and 5 feeding one scroll and Cylinder 3 feeding one for turbo 1
Cylinders 6 and 2 Feeding one and Cylinder 4 feeding the other fir turbo 2.

Now is this ideal? No would it work yes, there is only one exhaust wheel just two passages to the vanes.

I wish BMW did a manifold with 1,5,3 and 6,2,4 for mono scrolls as that would be an even sounding exhaust.

[forcefed]

Originally Posted by Allerum

Now is this ideal? No would it work yes, there is only one exhaust wheel just two passages to the vanes.

No, just because you can come up with a solution in your head doesn't make it so.

[Mapper]

Originally Posted by Allerum

Cylinders 1 and 5 feeding one scroll and Cylinder 3 feeding one for turbo 1
Cylinders 6 and 2 Feeding one and Cylinder 4 feeding the other fir turbo 2.

Now is this ideal? No would it work yes, there is only one exhaust wheel just two passages to the vanes.

I wish BMW did a manifold with 1,5,3 and 6,2,4 for mono scrolls as that would be an even sounding exhaust.

Twin Scroll requires consistent evenly dispersed pulses into each scroll every 360° of crank rotation - to enjoy the benefits of twin scroll. Not only are you not achieving consistent pulses into each scroll throughout the fire order, you have the other turbo hanging out doing nothing for half the crank cycle. this will create non-uniform pressure.


your example above - Turbo one would have two pulses on one scroll cyl 1 fire and then Cyl 5... so far turbo 2 hasn't received anything 120° into rotation - being pushed against from the boost side to boot. and then the other scroll of turbo 1 gets one more pulse - we are now 180° crank rotation - and still have turbo 2 dead weight, then you are merely reversing this for the last 180° rotation.
anyway...
would this work? well... there are many ways to make boost, but this by far inferior. The entire reason for twin scroll is to deliver more power from less fuel than a single counterpart by providing consistent pulses throughout the crank rotation. your example there are huge gaps in the crank rotation would provide less power, more fuel and horrible response. (opposite desired effect).
two twin scroll turbos needs 8 cyls. end of story. no manufacturer or performance shop
uses severely handicapped setups like two twin scroll turbos run by 6 cylinders for a reason.

[G MONEY]

Originally Posted by Mapper

Twin Scroll requires consistent evenly dispersed pulses into each scroll every 360° of crank rotation - to enjoy the benefits of twin scroll. Not only are you not achieving consistent pulses into each scroll throughout the fire order, you have the other turbo hanging out doing nothing for half the crank cycle. this will create non-uniform pressure.


your example above - Turbo one would have two pulses on one scroll cyl 1 fire and then Cyl 5... so far turbo 2 hasn't received anything 120° into rotation - being pushed against from the boost side to boot. and then the other scroll of turbo 1 gets one more pulse - we are now 180° crank rotation - and still have turbo 2 dead weight, then you are merely reversing this for the last 180° rotation.
anyway...
would this work? well... there are many ways to make boost, but this by far inferior. The entire reason for twin scroll is to deliver more power from less fuel than a single counterpart by providing consistent pulses throughout the crank rotation. your example there are huge gaps in the crank rotation would provide less power, more fuel and horrible response. (opposite desired effect).
two twin scroll turbos needs 8 cyls. end of story. no manufacturer or performance shop
uses severely handicapped setups like two twin scroll turbos run by 6 cylinders for a reason.

Stop making sense!!!! Someone can’t admit they are wrong. For god same

[Allerum]

Originally Posted by Mapper

Twin Scroll requires consistent evenly dispersed pulses into each scroll every 360° of crank rotation - to enjoy the benefits of twin scroll. Not only are you not achieving consistent pulses into each scroll throughout the fire order, you have the other turbo hanging out doing nothing for half the crank cycle. this will create non-uniform pressure.


your example above - Turbo one would have two pulses on one scroll cyl 1 fire and then Cyl 5... so far turbo 2 hasn't received anything 120° into rotation - being pushed against from the boost side to boot. and then the other scroll of turbo 1 gets one more pulse - we are now 180° crank rotation - and still have turbo 2 dead weight, then you are merely reversing this for the last 180° rotation.
anyway...
would this work? well... there are many ways to make boost, but this by far inferior. The entire reason for twin scroll is to deliver more power from less fuel than a single counterpart by providing consistent pulses throughout the crank rotation. your example there are huge gaps in the crank rotation would provide less power, more fuel and horrible response. (opposite desired effect).
two twin scroll turbos needs 8 cyls. end of story. no manufacturer or performance shop
uses severely handicapped setups like two twin scroll turbos run by 6 cylinders for a reason.

I was just commenting that you said is wasn't possible. That is not true. It would be dumb and pointless but not impossible. It would probably sound different though from the firing order.

I was never stating it was ideal, just that it was possible. I believe the ideal is a twin scroll single low mount.