20g superback Billet 7+7 blade.
GTX style performance upgade.
extended tip and also slightly taller wheel which will be a straight drop in.
the 7+7 extended tip offers a bit more power
(10-15% more flow) and better spool than the cast wheel. so is a win win.the 11 blade is more readily available and better spool, but i thought more top end on a lower boost level would be more beneficial to me.
uprated rebuild kit.
this includes wider spacers to help thrust load with a bigger surface area on the thruster bearing.
the thrust bearing itself is now a 2 oil port design for additional lubrication
turbine wheel, only option i had was a stock turbine wheel.
i fiddled around with the bearing on the shaft in the worn area and i could feel movement, whereas on the untouched portion of the shaft, i couldnt get any play with the bearing. so i imagine this is why the turbo has shaft play.i believe this issue is down to poor oiling and/or low pressure, high heat.
so new one needed
i also looked into the oil drainage system.
the -10an kit supplied although pretty, had a number of very small drain areas at the in, out and all the fittings (12mm ID). -10an hose itself was 14mm ID.(turbo drain is 15/16mm on the CHRA and its recommended to keep to this).The previous oil drain system may have been the same, but i wasnt supplied with the old one so dont know.
small drainage can potentially cause oil backup in the housing causing it to leak at the turbine side, causing it to smoke when at high pressure, ie full load or cold starts.
the CHRA was caked in oil in this area, so ive since cleaned this up and looked into a larger drain kit.
ive decided to go big.
so ive got hold of a 1/2npt adapter which will mate to a 19mm return line, hooking to the oem drain fitting at the block (16mm ID).this should mean a minimum of 15/16mm all the way through even the connection points.
OEM block fitting vs
-10an!12mm vs 16mm ID
new 1/2npt fitting VS
-10an fitting at the turbo.
