Upper limit of .48?

Not sure why, but the T3 I am using is a .48 hotside, and now I am wondering if it is even worth rebuilding?

What is the limit on the .48? Would seem to me it is not really an upgrade from the IHI. How hard is it to change over to the .68?

It spools nice and quick but it has got to be choking the top end A LOT!!!!

Go back to the IHI and then tell us it's not an upgrade.

I went to a 0.48 and liked it. But I made a lot of other improvements at the same time so it's hard to sort out. I like the quick spool, but I never ran a 0.63 so I can't compare them. The 0.48 had better top end than the IHI.

Ok...

That's all I needed. Thanks Pete. It's been a while since I drove w/ the IHI (6 years), and guess my but forgot.

Originally posted by tr_guy79:
How hard is it to change over to the .68?

IF
the bolts holding the swingvalve come out w/o breaking

AND
the bolts holding the turb housing to teh center section come out w/o breaking

THEN
its pretty easy

I am aware of the bolts breaking holding the turbine housing to the center.... See my post in WTB

Also, the same wheel and downturn works?

I may be buying one from someone on here, and need to be sure it will work.

Thanks

Yes, the housing is the only difference, same wheel/elbow.

I did some reading on turbos and it seems that he difference is the internal volume of the housing. Basically, the exhaust flow better CFM, but at a lower velocity, which causes slower spool, but better flow for more top end power.

Is this correct?

yes

It's been proven in this case to only delay spool up by 50-100rpm though which isn't even noticeable in the real world. The gain up top is certainly worth the slight loss of spool down low.