I have a question about the sc61, ive searched on the board for about an hour and a half and cant come up with exact numbers...what are the spool up times for the sc61? ive seen a few posts that say around 5000rpm...but i dont think they were exact and were just estimates. Also, are there certain variables other than the size of the turbo that govern spool times?

 

from everything I learned here. the bigger the Dp and exhaust is is the quicker the spool time is basically try to eliminate as much back pressure as you can. also bore size, U having an h22 I dont think lag would be much of an issuse for you. even with a 2.5 inch exhhaust. but all those, tuning, proper a/r ratio and even porting the head all contribute big time. I doubt it will take an h22 5k to see 10psi

 

https://honda-tech.com/zerothread?id=700491
https://honda-tech.com/zerothread?id=698984

Look at these two threads, they should help. Search too, there are good topics in the archives.