Quote:
Originally Posted by Ronmaster901
guys i know the numbers and what produces what kind of power. Just giving an opinion. When people think of honda, they think of engines that wrap out. I just cant stand it when these t25 and t28s choke up top...its so aggrivating, yeah, the midrange power is nice, but its nothing (imo) to when a larger turbo (meaning a larger Area/Radius turbine) lays you back in that seat and keeps laying you back harder and harder the higher you rev. Backpressure FTL. Get those exhaust gases to hit that turbine wheel tangentially all you want....i want real power. lol jk on real power...just my opinion.
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The reason the T28's are choking so badly on this motor is because of the manifolds they are bolted to. If you put a GT2871RS on this motor with a Full-Race quality tubular manifold DESIGNED for that turbo and motor it would spool up at 3K and pull like a freight train to redline. The other main problem is the lack of efficiency in the turbine sizing and design when applied to this motor. The GReddy turbo was not designed for a motor that flows as efficiently as the K motor. It was originally designed for the SR20 and Miata motor(I think). The turbine is too small and there are too many blades on the turbine wheel which choke the crap out of the motor at high rpm. And I'm guessing that the same thing is happening with the TSI turbo. Now, combine that restrictive turbine design with a log style manifold and a wastegate that is just a little too small as well and you have problems making serious top end power. Your low end and midrange will be silly but not up top.
Now about backpressure. You definitely need some with a turbo system for spool up. I'm not 100% on this subject because It's rather confusing to me. I'm still trying to learn about this aspect of turbochargers. I know that the more heat you can keep contained within the manifold and exhaust, the quicker it will spool and the longer it will stay spooled up. So wrapping your manifold and turbine is a great idea. Now when Geoff chimes in he can straighten all this out a lot better than I can.