Quote:
Originally Posted by chaz_r33_gtr
This occured to me whilst I was fallin asleep the other night (sad i know!) whas anyone ever tried using 2 differing size turbos with a custom manifold
e.g. use 4 cylinders to drive a large turbo and 2 to drive a smaller turbo, assuming you could use 2 boost controllers to controll each turbos wastgates so that the small one only boosts to say a bar and the larger turbo can boost to 2bar say. It would seem you would get the best of both worlds with virtually no turbo lag..
Would this be possible?
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Sounds like a recipe for disaster to me. Even if you did get one spooling before the other, you'd have to install one way valves else the boost the earlier-spooling one produces will just try to reverse down the other turbo.
Also, the engine won't be particularly balanced as you'd have two cylinders producing different power to the other 4, and probably having to run a differerent mixture and ignition timing due to different exhaust restrictions.
If you look at the system on the Supra it's quite complex. I don't know much about that system but I gather it causes quite a bit of back pressure which then meant that Toyota had to put mild exhaust cams on to prevent reversion, which are presumably the main 2 reasons why people remove this setup when trying to get big power out of Supras.