- May 23, 2006
It isnt less efficient on the compressor side. Most see the td05h 20g fall on it's face up top when they are using the td05h turbine wheel (td05h 20g refers to the td05h turbine wheel mated to a 20g compressor wheel). No one really complains when the larger turbine wheels are used, or when the 05h is clipped.
What goes in must come out. The compressor can be 100% efficient up to choke but if the turbine is too small for the compressor flow, it will fall on it's face.
Havent actually done anything yet. Just looking at what others have done in the past. Not sure where I read it but I know I read someone claiming the smaller comp. housing choked the larger wheels causing more heat. Not saying its correct. Seems most of what I read online isnt these days!
Had planned on rebuilding my big 16g anyway. Figured as long as I had it apart Id buy the $145 balanced 20g wheel and modified TD05H comp. housing for it. (Ebay)
Seems folks are making 400+ (450?) on the big 16g now. So if I could still have peak around the same and a little more midrange then it seemed like an ok upgrade for the money. If its mainly the exhaust wheel/housing that is the limiting factor when doing this upgrade I may not do it at all. I just thought for the $145 why not go a little larger. And try to use the pre-injection to bring up the efficiency. If its the exhaust that is limiting and not the compressor/housing, then maybe Ill spend the money elsewhere.
Thanks for the explanation