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Title: Second gen Turbo question?
Post by: Grizzly on March 04, 2003, 10:52:14 PM

Ok can somone explane what "independent twin scrolling turbo" is on a 1989-1991 Turbo 2?

Its bugging me a bit becouse i thought it was basicly another name for a Divided Turbo but i have had a look at my old one and nothing jumps out at me?

I know its a bit of a Dumb Question but thats Life if i dont ask i wont find out.

Chris

Title: Second gen Turbo question?
Post by: sim_rx3 on March 05, 2003, 12:05:25 AM

it just means that there is 2 turbos that are independant of each other (ie one turbo doesnt rely on the other to spool up)!!

Title: Second gen Turbo question?
Post by: Grizzly on March 05, 2003, 12:11:38 AM

Belive it or not it only has one Turbo?

Chris

Title: Second gen Turbo question?
Post by: sim_rx3 on March 05, 2003, 02:09:23 AM

ok, it could mean that there is a twin blade set up (on compressor wheel) in the turbo.
just a guess, other than that wouldnt have a clue!!

Title: t-bo
Post by: t2rew on March 05, 2003, 08:48:20 PM

yeah i would say it is two diferent pitches of blade on the same wheel, one works lower rpm than the other so you get longer power band. and the turbo is independant, it is on its own

Title: Second gen Turbo question?
Post by: S2 13BT on March 06, 2003, 11:53:04 AM

I haven\'t heard the term \'Independant twin scrolling turbo\' before, but I believe you\'re refering to the \'Twin Scroll\' turbo system used on the S5.

It\'s basically just a divided exhaust with two seperate \'scrolls\' within the turbos exhaust side. This keeps the gasses from each housing seperate until they are leaving the turbo, which reduces turbulence which helps with flow. Also, by having two smaller \'scrolls\' the gasses will move at a higher velocity aiding spool up.

Hope that helps.

Title: automobile magazine may 1986
Post by: t2rew on March 12, 2003, 09:43:50 PM

mazda developed a special turbo unit in conjunction with hitachi ,turbine blades are recontored to use the high impact effect of the exhaust gas and the housing is cast with two seperate chambers. the "twin scroll" design effectivly changes the exhaust chamber volume in responce to engine load and rpm

a valve either concentrates exhaust flow for quick response or opens up the entire housing for high total flow. theres much less compromise in the turbos design caracteristics, giving it much of the response and low range torque of a tiny turbocharger, in addition to the highspeed boost of a big free breathing unit.

Title: Second gen Turbo question?
Post by: Grizzly on March 13, 2003, 06:08:11 PM

Ok so its just a Devided Turbo.

I thought by the Name it my have been somthing more Complex.

Cheers

Chris

Title: Second gen Turbo question?
Post by: MikeLMR on March 13, 2003, 06:34:08 PM

sounds complex enough to me :D

Mazda Rotary Club

General => General Technical => Topic started by: Grizzly on March 04, 2003, 10:52:14 PM