Undersanding a Turbo's Trim specs?

[ppctx]

I've never fully understood turbo specs, but I'm guessing that if all other factors held constant, a 60 trim would spool faster (along with slightly less peak power output) than a 50 trim?

[Ekinchheng]

It would be the opposite actually, smaller the trim (faster spool, lower hp rating) and bigger the trim (slower spool, higher hp rating)

[ppctx]

It would be the opposite actually, smaller the trim (faster spool, lower hp rating) and bigger the trim (slower spool, higher hp rating)

You are the man Ekincheng for answering, do you think there is a huge difference in 50 vs 60 trim turbo if both are sporting a .63 AR exhaust?

I'm currently running a 60 trim with a .63 AR t03/04 on a ka24de and just curious about what I would do if I ever needed a new turbo.'

[Ekinchheng]

It would be the opposite actually, smaller the trim (faster spool, lower hp rating) and bigger the trim (slower spool, higher hp rating)

OOppps, i read it wrong sorry, this is for A/R. Trim would be how many xx amount of air going into the turbine wheels

Here's a site that talks about it

http://www.turbobygarrett.com/...tml#a

[hannibal]

I would suggest you compare the compressor maps for the two wheels. See which is more efficient in the range youre running in. Apparently, the 50 trim is more efficient across a broader range, though Ive never verified this for myself.

Check http://www.turbocharged.com for T3 and T4 comp maps...

By definition, trim is the ratio of the inducer size squared to the exducer size squared.