I did some reasearch on reading and ploting your engine on a compressor map. How ever thats only half the turbo. I dont know how to disifer the compresor side to find out the best turbo. I think all i need to know how to do is finding out what the formula to find what the shaft speed will be at any given engine speed, right?
Second thing is what is a good value for the temp on the intake. I relize this will vary depending on location and colling options on your car but does anyone know what the "normal" intake temp is on an sr20det?
This would make finding the corrected air flow much more exact.
The problem im runing into is that you plot the engines air flow requirments for a given boost and it will show you what the compressors rang is at a given engine speed, however without at least an estemated shaft speed its hard to tell what it will actualy run. Now for instance the GT28RS, acording to the map, will flow 18 psi but that takes an very high shaft speed, or the GT30R will spool to 18 psi at 4400 acording to the map but it almost needs as much shaft speed as 18 psi at 7500.
Right now im looking at the garrett GT28RS or the GT30R. Im looking to bring my HP to about 350-400 and will probably have to run 18PSI to do so. However I'm not making a drag car i whant a road car so spooling at 4500 RPM blows when coming out of those hairpin corners.
By the way im not afraid of math. So if you have formulas on this send em my way.