PndaS2K

What are the major differences between a twin scroll and a single scroll turbo? is it the number of waste gates used? i.e can a single scroll only use one waste gate or can it use two? Im new to the turbo world and I'd like to know because I plan to turbo my S in the future. If someone could please explain to me the differences I would appreciate it. Thanks

S2KIrishman

youd probably have better luck posting in the FI section

RacerXI

Single will use a common manifold collector to push exhaust pulses through the turbo. A twin will have this split into 2 cylinders each. They will come to a common collector, but the manifold will have a split with two wastegates. Each pair of cylinders will have a wastegate. Your manifold type and design will determine the number of wastegates. In some cases, a single large turbo (not divided) will require twin wastegates to keep the boost under control (think path of least resistance). Read this.
http://www.modified.com/tech/modp-09...n/viewall.html

PndaS2K

Thanks for the good info. The difference between the T3 and T4 flanges; Are the size, Correct? Or are there other things too?

s2klariat

Thanks for the good info. The difference between the T3 and T4 flanges; Are the size, Correct? Or are there other things too?
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Correct, it is referring to the the size of the flange on the manifold that connects to the exhaust housing on the turbo.

RacerXI

Yup. The flange and the size are both different on T3 & T4 housings. Your T78 nomenclature turbos are typically T4's while your GT35's and such are T3 based turbos. The rabbit hole goes as deep as you'd like on turbos. I tell most people to pick a power level and build your kit around it with budget as your constraint. Even ugly rusty stuff works.

PndaS2K

haha ugly rusty stuff who would use that!

s2knoob89

Google is your friend

blasphemy101

RacerXI

It isn't pretty, but it'll work. What I'm saying is you don't need the newest tubular high name, big dollar manifold to make power.