anyone know the reason for this??
jasen said:It's pretty stupid really.
Half of what really gets the turbine to move is the temperature difference between the gas coming out of the manifold and the gas on the other side of the turbine. So now, the only thing moving the turbine is exhaust gas just blowing by it, slowly at that. So strike one for inefficiency. The exhaust gas temp has little to do with the intake air temp, so that's not a reason to put it back there.
Second, that extra 8 feet of piping after the turbo outlet creates how many extra cubic feet of airspace? Meaning the turbo would have to work much harder to raise any kind of boost level. But then it's being pushed by cool, slow moving exhaust gas, so it can't exactly work harder. Strike 2 for inefficiency. I bet the lag on that is horrific with that extra airspace too. Probably doesn't hit full boost until he's ready to shift gears.
So that big old turbo is probably work hard just to get a whole 5psi.
The only positive I see, is that it's probably an easy install. Don't have to work in a cramped engine bay, don't have to have a custom manifold. But for the money they probably charge for that kit, you could set it up right and get lots more power.
I agree completely. I havent researched to much into it, but from what I did see it didn't seem to be as bad as I first thought...Then again I never considered it for a 4cylinder, I was mostly interested in the v-8 set-up..jasen said:Yeah, he's pushing 13psi. And 13psi on a V8 is going to net you some big numbers. And maybe with a V8 pushing all that air, the lag may not be so bad either.
I still have a hard time trusting it for small displacment cars. I'll have to read a bit more on what they're doing.