I think i've got to where i can understand the compressor maps but what about the exhaust side. Am i missing something. Like the t3 with 60 trim. it dosn't say anything about what size the exhaust housing is. I currently have a A/R 48 but think i need bigger. how do i find out the proper turbine size.


[Modified by fire7882, 11:44 PM 9/23/2002]

 

Good luck there buddy...I've been trying to find out the answer to that one myself and the only thing I can tell you is; take your best guess.. I have a h23a and .48a/r from what I hear is too small. I'm going to see for myself before I spend $150.00 to change the turbine..Tell me what engine you're running and I'll try and point you in the right direction...There really isn't a standard formula for this...It's just trial and error

 

b16a, i only want to run 7-10 psi ntil i can build an lsvtec turbo setup. Thanks for the help.

 

someone must know

 

You have to figure out what kind of air your engine will flow at your desired psi (aka pressure ratio), then you plot the points on the compressor map you think you need. If your points plot in the highest efficiency area of the compressor map, then that's the compressor you want to get.


Can you see the little black dots? That's my points for 0.8 BAR, a pressure ratio of 1.9 with 2 psi of loss. 1st point is 4,000 RPM, the last point is 9,500 RPM.

[Modified by xThexHeadx, 5:21 AM 9/24/2002]


[Modified by xThexHeadx, 5:24 AM 9/24/2002]


[Modified by xThexHeadx, 5:25 AM 9/24/2002]

 

OK, i got that part down, but i can't figure what size exhaust housing i need. I've seen them from .48 a/r to 1.15. What is everyone here running to get 250-350 hp.

 

There are no maps for the exhaust side. Generally, the bigger the a/r, the slower you are going to spool. A 48 a/r on the street is a pretty good size for low to upper-mid range performance. You could jump to the next size but there are no guarantees of any better performance and you can get a slower spool at a higher rpm. Don't be fooled by bigger has to be better. Hondas on the street like a smaller exh. with a bigger intake side. You can make 350 whp with the 48 exh with the right sized intake.

 

http://www.innovativeturbo.com/Turbo...o_How%20to.htm
Pretty good explanation of compressor maps.

 

thanks for all the info. I feel a lot more informed.