ashb82

which would spool faster

kryptyksol

Nice Holset I have one of those too, the fully out position should spool faster. Think of it like you have a pinwheel, and either a straw or a garden hose to blow through, which one will cause the pinwheel to spin faster?

ashb82

thats what i thought but i cant spool it at all. when i take a air compressor and blow on the large diameter blades it will spool faster it i blow on the smaller part it spools slower

kryptyksol

I dont think the best way to test is with an air compressor, you could damage the bearings doing that, by spinning the turbo with no oil going to it.

Also, an air compressor flows a lot less volume than an engines exhaust, its not really a valid comparison, engine exhaust is HOT (a lot of people dont know this but the gas is still expanding after it exits the cylinder, turbos take advantage of this effect), low pressure, and high volume, where as an air compressor should be cold air, high pressure, and low to mid volume.

That and I dont imagine you are sealing the air compressor outlet to the turbo inlet with anything other than your hand, these turbos close up so far that there is only about 1.5mm of space between the housing and the flat surface under the vgt blades, and air will take the path of least resistance, which will likely be past your hand.

Pretty much the only way to test this turbo is to run it, I'm going to be doing that sometime in the next year, after I build my motor.

ashb82

i did run it i only had boost at 6000 Rpm then i have to shift loose boost then build it back up i was hoping for boost ay like 3000 rpms stay spooled till i let out. I did find a kink in my vacum line going to my BOV would that hurt it.

kryptyksol

huh, that's weird, should spool faster than that, the kink in the bov line would definitely not help the losing boost between shifts problem. What is the rest of your setup? Were you running the VGT vanes just stuck in one position? or did you have something actuating them?

ashb82

yeah i just was going to stick it in the position that spooled the fastest
then use a 14b wastegate to work it once i knew i could spool this big turbo. i think i will figure a way to lock the vgt. it maybe pushing the vgt open as it starts spools.

kryptyksol

yeah, I think it would push the vanes open if you didnt have anything securing them. I've heard of people just running a spring on the actuator arm, then the exhaust pressure will push the vanes open when it gets high enough.

ashb82

It works now thanks for the help i love it. spools 8psi at 3000rpms. I am going to try the spring thing you are talking about befor i start tuning on it. I will have to say this big turbo spooled fast than my 60 trim turbo does. I cant waite to crank up the boost

kryptyksol

Thats great news are you running a single cam like it says in your sig?

honda4g63T

check for boost leaks and make sure your wastegate is not open

ashb82

yes but its a f22b1 fully stock with just boost