usually small turbos just give out on high rpms, and become restrictive to exhaust flow. And the wastegate will get rid of excess exhaust gases.

 

good to know...thanks for satisfying my curiosities...any takers on "sequential?"

 

"Sequential Twin-Turbo", was designed to improve response and further reduce turbo lag. The turbos operate sequentially, that is, at low speed, all the limited amount of exhaust gas is directed to drive one of the small turbines, leaving another idle. Therefore the first turbine will accelerate quickly. When the exhaust flow reaches sufficient amount to drive both turbos, the second turbo intervenes and helps reaching the maximum boost pressure.

 

HAH...just what I thought...thanks!

 

its mazdas way of having a larger turbo than the turbo 2, without making it laggy



mike

 

They were designe to run sequential but I had switched mine over to non-sequential so I had to build up enough exhaust gas to spin them both so I had a little more lag but a little more mid range and the same top end. No transitions though so when my boost came on it did not 10-8-10. It just stayed 10-10-10. I think it is a better way for drag racing but worse for track racing.

 

yeah on the street the sequentials are really nice, but once you get off the street they get unpredictable



mike