I came out of the servo and couldn't resist a snap. But don't be fooled, the paint is rubbish!
The porting of the turbo and manifold have really helped keep temps down and gained me a 500rpm decrease in spool time to full boost. I'm sure there would be greater gains to be had if it were done professionally. (Pics in 2 posts above)
I've been having boost drop issues since all of the "upgrades", and ive also just solved an issue where the 360 would lean out to 18:1 for a few seconds everytime id come to a stop and it would also hesitate (and lean out 17:1) for a second everytime I came off a cruising part throttle.
The culprit was the atmospheric BOV Mamba fitted to the 19t.
Fitting the standard CBV solved both of those issues...but I suspect it may be leaking, as when I installed it I was running rich and down on power.
I had a block off plate handy, so I confirmed my suspicions after taking the 360 for a quick hoon.
Now I'm onto this CBV from Kinugawa.
I also had a major boost leak from a split hose to from the Idle Air Control Valve (IACV) to the intake manifold...this one:
So I went and ordered the do88 ones from prestige automotive(?) In Melbourne. Andre is the guys name and he's really easy to deal with and very fairly priced.
In the meantime I have rigged something up to keep me on the road. I rotated the IACV 180 degrees so the port was facing upwards. Found some old tapered heater hose that i was able to fit to the IACV and join to some 14mm silicone vacuum hose I had laying around. It was over a metre long and I didn't want to cut it incase I needed it later, so I wrapped it around the engine bay.
As for the boost drop at higher rpm, I've fitted a 22psi rated actuator spring and it will only hold 14psi then drops to 11 at 5000rpm. The 18psi spring only holds 12psi and drops to 10, so something is up there.
If I remove the vacuum hose to the actuator it produces high boost just fine. Controlling it is intensely fun.
Running a manual boost controller (bleed valve) I can obviously get higher boost levels, but it still drops from 16psi to 12psi.
I've run a boost leak test with compressed air from the turbo outlet to the throttle body and it holds 20psi.
It doesn't sound like I have a boost leak. Although, small ones may be masked by intercooler and exhaust noise...? Any suggestions would be nice if people could chime in. I find it strange that the 22psi rated actuator spring will only hold a peak boost level of 14psi. Plenty of Pre-load on the wastegate with the stiff spring. I could barely get it on with a 3-4mm gap.
