I'm surprised how little exposure the test I posted last page is getting. That's the only instance of a SS vs TS comparison I've ever seen on a 4G63, and it's being pretty well glossed over (I guess the "debate" didn't help things..)

 

From some tech articles I have gathered twin scroll is the bomb, and has literally no losses. There is an interesting post on the mazda forums, with data from mazda on twin scroll versus single (it is old, but science is science):

http://www.rx7club.com/single-turbo-...turbos-903210/

According to Geoff at Full Race:
"We have found the twin-scroll systems have higher backpressure at low rpm (which is good for turbo spool-up) and lower backpressure at high rpm (which is good for top-end performance). On the other hand, single-scroll systems have lower backpressure at low rpm (bad for spool-up) and higher backpressure at high rpm (which hurts top-end performance)."

~Jaraxle

 

It only reinforced what I've been saying lol

 

I have read many articles either "tech" or opinionated, started with books and magazines and proceeded with the internet about 20 years ago, and there was nothing convincing enough to assure me things were as such. So I started experimenting with both types of housings through the years on various setups, and the results were not as such as the ones described in the above or other articles, in fact I came to the conclusion and consideration through the results I had, that both types differ so very little from each other which is not worth taking into consideration, that both types can yield the same results if setup right, and certainly nothing as the comment geoff made. To me the only actual factor that really matters, is the a/r and cm2 area of a housing.



My personal opinion derives from my personal experiences and testing, and to me that is both a catalyst and ultimate proof on the matter.












Marios

 

You've never posted any of your "personal testing" and we have posted things that disprove what you say. So, yeah...

 

If you do not like my posts and consider them not worth reading, do not read them nor bother yourself with them. You've posted nothing that disproves what my testing has shown me, there can't be anything that disproves reality.



Believe whatever you wish to believe, it makes no difference to me.












Marios

 

It's not what I "believe". It's the hard evidence in front me.

 

That's no hard evidence by far in my eyes lol, but as I said you can believe whatever you want.










Marios

 

RS200 posted a great article, in this thread...lol

 

You are missing some key aspects in your argument.

 

This looks twin scroll to me...lol

 

It also looks surprisingly similar to the EFRs that were to come 30 years later....some connection between the two? Lol.

 

Is he on timeout again or has he been given the ban hammer?

 

I've been having a play with a Detroit series 60 of 1999 vintage.
Twin scroll Garrett AND VGT. 500 horses or thereabouts at about 2000 RPM from 12.7 litres.

edit, not VGT but twin internal WG

 

I love the extra throttle body before turbo that BMW and renault used in the 80's to combat lag..