Previously I *believe* i had a stock 13bt ct26. I have the wheels kicking about so I can put the vernier on them if it matters. It was definitely the stock turbine housing, noticeably larger than the new housing. The center housing was apparently flogged out.
The new turbo is supposedly the 1hdfte turbine housing, a ct26 core, 1hdfte turbine wheel, 16g compressor, with my old ct26 compressor housing. I don't know exactly what machining was involved in making this fit together.
This was put together by a well known new zealand turbo shop, several posters pm'd me about this and had only had positive dealings with them. I spoke to them again, and they said there's the possibility to put a smaller compressor wheel in there, involving some machining, but they don't want to do it before putting the truck on a dyno "to see what's going on, where it's making its torque etc".
What I think that really means is that they don't trust that there isn't something else wrong, with the fuel pump for example. To be fair the truck is a 1970s Land Rover, and a few things on it are pretty rough. I know the only performance difference between now and a few months ago with the ct26, is the low/slow boost below 2k rpm. I replaced the fuel lines, checked the spill timing, and adjusted the valve clearances, otherwise didn't do anything to the pump/engine. Up until i bought this truck I spent all my time and money on dirtbikes, and going back a few years road bikes. I've always pissed about with jetting, exhausts, air boxes, squish etc on 2strokes. The trick to the 'seat of the pants dyno' is to only change one variable at a time. Once in a blue moon something coincidentally breaks at the same time as you make another change and sends you on a wild goose chase, but I don't think that's happened here.
I've dropped a lot of money on this truck since I bought it bringing it up to spec, and particularly the last few months. I took it off the road to rebuild the transfer box and ended up getting the gearbox rebuilt, new rear prop made up, rad recored, and of course the turbo upgrade because the old one was blowing and leaking oil with crazy end float. I'm pretty bummed out to put it all back together to find the turbo is worse than stock, can't produce more than about 6psi till after 2k rpm. The landy runs 3.54 diffs so 2k rpm is 80kph in 4th or 100kph in 5th. 4th is gonna suck on the hills.
The turbo shop said they would try and sort something out with the dyno tuners they work with, but i've not heard anything back and realistically I've run out of time and money for the moment. I'm waiting on a visa change to be approved so I can move to a different part of NZ to start a new job. The landy is driveable for now so I'll make the move, replenish the bank balance, get another daily driver (current daily is about ready to be scrapped so I'm not taking it with me), then look at getting a smaller comp wheel put in. I'll probably go to a different shop though.
