1 Attachment(s)
Hi,
printout as promised Attachment 53203 It clearly shows improvements all round but still not satisfied with spool :brickwall Time to address pipe work and run the test again :thumb: Results to follow good or bad :Whatever_ Cheers Kev |
1 Attachment(s)
Hi,
on another note the SC46 billets will be here this week :D at last ! Look at what is coming with them :thumb: Attachment 53204 An SC46 Twin Scroll Billet :luxhello: Cheers Kev |
Originally Posted by The Gaffer
(Post 9233269)
Look at what is coming with them :thumb:
An SC46 Twin Scroll Billet :luxhello: |
what engine is that suited to kev? and what power .... with supported modz of coarse...
and is the twin scroll just for jdm models? |
Originally Posted by The Gaffer
(Post 9233269)
Hi,
on another note the SC46 billets will be here this week :D at last ! Look at what is coming with them :thumb: http://i694.photobucket.com/albums/v...aringturbo.jpg An SC46 Twin Scroll Billet :luxhello: Cheers Kev |
Originally Posted by wrx9181
(Post 9235238)
what engine is that suited to kev? and what power .... with supported modz of coarse...
and is the twin scroll just for jdm models? It is a direct replacement for JDM cars, however it can be retro fitted to any scoob with the relavent headers, up pipe and sump etc. :) The Hawkeye cars are all fitted with the correct sump as standard so retro fitting a twin scroll would be straight forward. Power wise we will have to wait and see, running the test Friday :thumb: cheers Kev |
Thanks sorry for silly questions but if you dont ask you dont learn cheers
|
sorry kev another question here ..... So whats advantage of twin scroll over other sc46?
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Originally Posted by wrx9181
(Post 9236863)
sorry kev another question here ..... So whats advantage of twin scroll over other sc46?
Hi, we will wait to see what advantages if any :D It is really aimed at the JDM cars where so far there are not many turbo up grades available. :( cheers Kev |
ah right thought it was faster spool or something
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The twin scroll separates the exhaust gas feed into two smaller venturi, than the regular 'single-scroll'. I assume this speeds up the gasses so as to aid spool up, as you say. This is the reason why there are not many twin-scroll turbos, as it's relatively new to the Impreza. Plus there are a lot of well-estb and effective normal turbos/uppipes/dowpipes, which don't help the aftermarket twin-scroll cause...
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cheers joz
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Might be interested in the twin scroll as things are changing .... let me know how it goes
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Do twin scroll headers have a different pattern uppipe-mounting flange too? Or can a TS uppipe fit onto normal headers and also be in the correct postion to bolt onto the TS turbo?
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Originally Posted by joz8968
(Post 9239274)
Do twin scroll headers have a different pattern uppipe-mounting flange too? Or can a TS uppipe fit onto normal headers and also be in the correct postion to bolt onto the TS turbo?
Hi, its a different footprint on both up and down pipes which is why retro fitting the twin scroll can get expensive. We are going to back to back the twin scroll against its single scroll brother and see if its worth forging ahead with it, (excuse the pun) :D We will still be able to offer the twin scroll Billet turbo to JDM owners as an upgrade but it may not be economical for a single scroll to twin scroll conversion, unless of course the gains warrant it :thumb: Cheers Kev |
Sorry, it was a daft question - the uppipe obviously has the twin venturis, so its header flange - and headers - MUST be different.
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Originally Posted by joz8968
(Post 9239489)
Sorry, it was a daft question - the uppipe obviously has the twin venturis, so its header flange - and headers - MUST be different.
cylinders are paired and kept separate right to the turbo rather than mixing at the collector. Simon |
A true twin-scroll has a different exhaust turbine to a single scroll: there's a set of blades designed to be spun from one of the pair's of header pipes, for low rpm performance; and a second set for higher rpm.
The separated pipe-pairs from the heads mean exhaust scavanging is better, and the turbine design means spool is greatly improved, but at the expense of high-end power since not all the exhaust gases are spinning the turbine at high rpm. Most high power "twin-scrolls" are actually "twin-entry": the exhaust scavanging properties are maintained, as the separation of the header pipe pairs is maintained right up to the turbo housing, but the impeller is a standard single-scroll core. A bit of a compromise really. So, the proof will be in the spool characteristics vs top end power. All IMHO of course :) |
Question is the vf36/37 true twin scrolls ?
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Originally Posted by typeRv4
(Post 9240468)
Question is the vf36/37 true twin scrolls ?
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Cheers for the explantion. It's nice that those turbo's are true ones.
Is the Toyata twin-entry turbo on the Mk.2 MR2 a normal single-scroll impeller-equipped one, out of interest? |
Originally Posted by tim hardisty
(Post 9240419)
The separated pipe-pairs from the heads mean exhaust scavanging is better, and the turbine design means spool is greatly improved, but at the expense of high-end power since not all the exhaust gases are spinning the turbine at high rpm.
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1 Attachment(s)
Hi,
at last the SC46 billet direct fit turbo's are here :D Attachment 53205 Just need to find a test mule now :wonder: Keep you posted. cheers Kev |
Very nice :thumb:
|
I'll watch the SC46 tests with interest (as my engine would be at its limits if one was fitted).
I'll be interested to see how much it pi$$es over the 20g! and how it compares to the 321... ;) |
what do you need to test it on kev? 2....2.1...2.35....2.5?
|
Originally Posted by joz8968
(Post 9240614)
Cheers for the explantion. It's nice that those turbo's are true ones.
Is the Toyata twin-entry turbo on the Mk.2 MR2 a normal single-scroll impeller-equipped one, out of interest? |
Originally Posted by Mad Hammer
(Post 9244945)
Single scroll with twin entry same as my GT4 ;)
Does the MR2 turbo have exactly the same engine/turbo as your GT4 ST205? |
Originally Posted by joz8968
(Post 9244967)
Thought so.
Does the MR2 turbo have exactly the same engine/turbo as your GT4 ST205? |
Sure. Love the Rev.3 MR2 in gleaming black (in a kind of cheesy, hirsuit, hairy-chested kindaway ;)). But would get scared peddling it with any viguor!
As Performance Car said of the Rev.1 MR2 Turbo 225: "The N/A (158bhp GT) version is fast enough thank you very much!" ;) It's the one rare example of a car where an aftermarket bodykit actually enhances its looks! (Toms) Sorry, I'm going waaaaaaaaay off topic here. :( |
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