[icicleboy]

Hey all/robert,

I switched from a T-66 S-trim .81 AR (OC) to the identical turbo but Q-trim .96 AR... as an experiment in lag/flow.

Interestingly, I noticed that backpressure (pre-turbo) seemed to go up as we lost 1psi of boost telling me that there is more pressure on the bottom of the WG. Does this sound right?

I realize that the S-trim is a better flowing wheel than the Q, but is it so much better that a .81 to .96 actually made BP go up? None of these turbines are F1 style wheels btw.

Thanks for the help.

[Robert]

Originally Posted by icicleboy

Hey all/robert,

I switched from a T-66 S-trim .81 AR (OC) to the identical turbo but Q-trim .96 AR... as an experiment in lag/flow.

Interestingly, I noticed that backpressure (pre-turbo) seemed to go up as we lost 1psi of boost telling me that there is more pressure on the bottom of the WG. Does this sound right?

I realize that the S-trim is a better flowing wheel than the Q, but is it so much better that a .81 to .96 actually made BP go up? None of these turbines are F1 style wheels btw.

Thanks for the help.

Actually the S trim is an F1 style wheel and yes it does flow THAT much better then a Q trim..

[ash]

Originally Posted by icicleboy

Hey all/robert,

I switched from a T-66 S-trim .81 AR (OC) to the identical turbo but Q-trim .96 AR... as an experiment in lag/flow.

Interestingly, I noticed that backpressure (pre-turbo) seemed to go up as we lost 1psi of boost telling me that there is more pressure on the bottom of the WG. Does this sound right?

I realize that the S-trim is a better flowing wheel than the Q, but is it so much better that a .81 to .96 actually made BP go up? None of these turbines are F1 style wheels btw.

Thanks for the help.

===================================\

i had seen simular
some turbo engines we build, we order Q trim turbines.
the Q trim is LESS efficent than the S trim
this creates a better low and mid range power band.
The S trim wheel is really good for all out rpm and high gas transfer.

eg.
some drift cars actually need more mid range power, and on/ off / on turbo response....

the only way to gain this knowledge is years of R & D.....
seek out a "older" or " seasoned" turbo design or development guy, for speciallised appications...

cheers
ash