[GREG O'Brien]

http://www.turbomustangs.com/turbotech/main.htm
http://www.gnttype.org/techarea/turbo/turboflow.html
http://ubb.turboford.org/ultimatebb.php?...4;t=000050

[67King]

Greg, you might want to sticky this for a little while.

[Mr__Merkur]

:worshippy: :worshippy: :worshippy: godlike :tfrules:

[onesillynotch]

try doing the math for the www.turbomustangs.com section on pressure temps..it dont add up???

"T2 = 535 (24.7 ÷ 14.7)0.283 = 620 °R"

did i miss something???

[onesillynotch]

o and what would you use to figure out say what will a .48/ 50 trim hybrid will pull to compared to a .63/ 50 trim..both being t3/t04e with stage 3 hot wheels

i see what rpms you say they start to spool at but how did you figure that out and also how can yu figure out at what point will the .48 start sloushing and the .63 pick up?

[Ron]

Originally posted by onesillynotch:
try doing the math for the www.turbomustangs.com section on pressure temps..it dont add up???

"T2 = 535 (24.7 ÷ 14.7)0.283 = 620 °R"

did i miss something???

Just a little carrot-
T2 = 535 (24.7 ÷ 14.7)^0.283 = 620 °R

[Ron]

Originally posted by onesillynotch:
o and what would you use to figure out say what will a .48/ 50 trim hybrid will pull to compared to a .63/ 50 trim..both being t3/t04e with stage 3 hot wheels

i see what rpms you say they start to spool at but how did you figure that out and also how can yu figure out at what point will the .48 start sloushing and the .63 pick up?

Unfortunately, Turbine maps don't exist publically for T3 or T4 exhaust sides :banghead:
What does it take to spool a turbo?

67King, you work at Ford! Does Ford have any turbine maps in their vaults?

[GREG O'Brien]

unfortunately there are about 20+ factors that play into spoolup time and there isn't a way to calculate this that is accessible to the average enthusiast.

it is trial and error.

in theory a .48 will spool before a .63 at the expense of top end power... and the same relationship between a .63 and a .82.

HOWEVER RS450 tested both stage III .48 and .63 turbos on a the dyno and he found that there was no difference in spool up time and the .48 gave up a bunch of HP on the top end.

Now there is a good chance that this was caused by one of those other 20 factors.

A good general rule of thumb is to stay "in the middle"

the T3 is available in .36, .48, .63, .82

stay with a .48 or a .63 - if you have a bigger car or want more response... go .48.... if you have a smaller car or want more top end power - go .63

if you are running nitrous or what huge power from 5500 - redline - go .82

and there really isn't any reason to use a .36 on a 2.3L motor.....

[67King]

Originally posted by Honda Eata:
67King, you work at Ford! Does Ford have any turbine maps in their vaults?

I'm not aware of the existance of such a thing.

And FWIW, with my current setup, I'm getting spooled at about 3000 RPM with a .48. When I put the engine in the car, it had a .63, and I spooled at 4000 RPM. Nothing else changed. No dyno results, but I did see a HUGE difference in spool time.

[Kraig]

My SVO has a .48 housing and my TBird a .63 housing. The SVO definitely spools quicker but I don't feel the "lag" in the TBird is bad, and it does pull well at higher rpm. A side note though.... Ken Schultz ran in the 11s with my SVO with a T3/T4 hybrid with a .48 housing..... and nitrous.