So Ive got a orecision t3/t4oe 60/63 with a 54 trim. Im trying to figure out what full spool/lag times would be like and what kind of power I can expect. i chose this turbo to keep me up in the power but not fall off up high in the revs. I plan on going around 6500-7k when dragging it. the car is a 89 accord with a JDM b20a. 9.1:1 wiseco pistons, h-beams, stock crank and all. Heavily modded head with OS vlaves. Basically Im tired of trying to figure out what it is supposed to be and guessing. id like to know what kind of efficiency roughly, lag/spool.

Also since its a t3 hot side. Ive got a 42/48 here also. Can i swap the 48 for the 54 trim and help spool al ittle faster. This turbo is 1 step down from the sc61. Its a stage 3 turbine if that matters ball bearing setup. Thanls guys. Oh According to what i think Im doing right spool time around 3800 rpm. man I hope it a little lower from the pros. Also I realize its an older car and everyone gonna knock on the older b series and all but hey i love the body style and since it s a direct olt in no mods needed i went with the jdm engine over the a20a3

 

I'm not 100% certain, but I don't want this thread to die without ANY attention. I think your calculations sound about right. I never dealt with B20s, but I imagine the bigger displacement should keep you sub 4500rpm. Then again you have a lowered compression engine and I'm not going to lie this is just an educated guess. I really have little knowledge on the B20 motor. I really wouldn't bother with the exhaust housing swap thought. The trim and wheel is probably different and the .48 will need to be bored out to have it fit. I have a .63 exhaust on my Y8 and I see 10.5 at about 4200. Given the wheels and all are different you have a much larger motor AND my compression is about 9.5:1, not much lower than yours. Hope this helps.


JP