Date: Tue, 11 Jul 2000 22:10:02 +0200 From: Mathias <af_RGnopsamnt.ser> Subject: Re: Turbo specs on 9-3, 9-5 needed
Ok, thanks for you input.......I can see that there are some differences in turbocharging a car and a bike.....:) Or, should I say, the problems encountered are a bit different. I wish you good luck and a safe ride on your killer bike..... /Mathias Mads Lund wrote: > > I am not at all a turbo expert (or even an amateur) but I have trouble > > understanding why you want (need) a turbo bigger than a gt17/T25 or > equivalent > > on a 1.1liter engine? These turbos can produce up to 350bhp in a 2.3l car, > hence > > they should be able to move all the air your bike can breath.......even at > > 15000rpm..... > > First of all, the Garrett GT17 I'm using on my bike (900ccm) is working > fine. No turbo lag at all ex. if I open the throttle out off a corne with a > initial rpm of 6.000 and acc. up to 10.000 before changing gear, when I open > the throttle does the manifold pressure rise as quickly as the throttle > opens, so that's perfect. When I draw it up from the bottom (3.000 rpm) does > the pressure rise from 0 bar at 4.000 to 0,5 bar at 5.500, and from that > point does the wastegate maintain this pressure to redline. > > The situation is that with higher boostlevels (max 1,1 bar) and a larger > capacity engine does the turbine and wastegate produce a back pressure > against the engine, that can (and does) cause problems. the result is that > the temperature of the exhause valves is too high, with detonation as > result. And my experience with detonation and aluminium pistons is ..... > expencive. So in order to lower the temperature is the larger turbine > needed. > > The goal for the ZZR1100 turbo engine is to produce 250 hp at 1,1 bar > pressure. >