Just checked the 11/2" sample i have here and it's sch10s he uses ...... so looking at the chart the 11/4" will be 36.7mm ID = 1058mm2

For what I want to do with the car , response is more important than peak whp . I do want to get a great number at peak as well ............but I have to admit it's more for proving the concept than anything else.

Sch 10 will help, glad to hear it



.

Brett - best of luck !!! I am very happy to see you trying an idea that's been kicked around and shut down mulfiple times...

Making me want to buy another rx8...

Really ? Never seen it talked about before ? Unless you are referring to the twin scroll idea ?https://www.rx8club.com/series-i-maj...system-216109/

Thanks BTW :)

Off to the fabricators in the morning !



https://cimg7.ibsrv.net/gimg/www.rx8...d94dbe0492.jpg

Just an idea I had while reading about your interesting setup your working on...

Instead of using a WG on the Center ports, wouldn't something like a "Quick Spool" (butterfly) type valve to close those port be a better option??

Don't shoot, just a thought...

Please explain .. don't understand why you would think that .

Pretty sure he means this....

https://youtu.be/_KNLKVgg8po

Yeah ............. don't see it working any better/worse than a wastegate but interested to hear why Ekim suggested it .

As far as i understand it, it's just for spool - butterfly directs all the flow to one scroll when spooling and then both scrolls when spooled - i've seen better designs were the valve works as a wall/hole between the runners

I think it may be overcomplicating it - if for some bizzare reason you have issues with spool, you can look into it

Sorry for the horribly unclear post... :yelrotflm

The thought in my mind is more like a combination of a exhaust cut-out and a "quick spool valve".

My thought would be have a your mid iron runner blocked with a "butter-fly" valve and actuated by an WG actuator. The valve mechanism is all metal and mechanical, so the issue of heat or over heating a WG diaphragm shouldn't be an issue. Also, in my mind, it could have better flow characteristics than a WG.

One thing I don't know is how well it would seal. If the "butter-fly" is like stainless, it might expand just a enough to prevent a leak causing exhaust to escape = loss of energy from main ports.

Hope you can imagine what I am mean. Not very good at explain things sometimes. Also this contraption would be built into the runner and run/exhaust into the main exhaust system... just put that in there just in case someone thinks I'm just saying to put a cut-out and exhaust to atmosphere... :D:

Gotya ... yeah the sealing might be an issue :dunno: .
Biggest issue so far though is space ... shoehorning everything in is a nightmare .

mostly because you're RHD. I couldn't understand why you had to use the smaller pipe until remembering that point ...

It's bad enough that space is limited ......... add RHD to that and you are doubly handicapped before you start !

So here is a little more on my thought... did a little light weight research on the interwebs and saw ATPs VES

VES-ASSEMBLY - out of stock again until unknown date due to production delays : atpturbo.com

VES-MAIN-VALVE-UNIT - out of stock again until unknown date due to production delays : atpturbo.com

Looks like this would hold better to the heat,locate easier, and seal.


https://cimg9.ibsrv.net/gimg/www.rx8...fa0891091c.jpg

MS Paint ftw!!

an "inline setup".

also if place further down the runner on the down-pipe side, you have more room and shouldn't change the F&R port flow. Flow is still going to follow the least path of resistance.... my 3.5 cents.

Really looking forward to what you come up with and your data.

Thanks for that.
It looks like it would do the trick ...Will explore that possibility if we cant get the WG to fit .

One thing I'm trying to avoid if possible is too much pipe volume between port and valve .

gotta love that jack haha Brett Speed :Peace:

It's a bad idea on several levels, not to mention they don't make one anywhere near the pipe size you have and the lack of space to fit it

I understand the ATP VES is too large. I was using it as an visual example to go with my illustration.

Elaborate on why its bad on several levels?

Possible Issues: (I can think of)

Proper Seal (Tight Tolerance, shouldn't be an issue)

Carbon contamination

Fabrication

Any plans to run an oil scavenge pump?

Turbo will be sitting higher than the Greddy ,which works fine without one , so can't see any need.

What is your plan for dealing with the turbine inlet piping and position? It will make contact with the stock engine mount.

Will be making a new mount ....

Converted back to NA (f**k it's sooooooooooooooooooo slow) and drove it in to fabricators this morning .
Feeling somewhat apprehensive I have to say .

Good luck with that.