http://www.blackphoenixtech.co...t.xls


there is all the calculations i made in excel (took FOREVER!)


and here is the turbo map for the turbo i am thining of getting.

I am confused of how to plot the points on the Comp Map, do i adjust the PR to the rpm to get a slope?

Please tell me if all my calculations are correct and if this turbo is suitable




need your turbo smart people to give me a hand before i spend my $$ on the wrong ****! Thanks a million!!!

 

bump!

 

bummmmmmmmmmmmmmmmp

 

^^^

 

thanks for the bump!

 

bump for a reggin

 

bump

 

eagles bump

 

bump come on nobody knows this ****?????????????????

 

what are you trying to get out of this turbo. my computer cant use the link you have for some reason


looks to me like you can get bout 200ish hp with 9psi and bout 300ish hp with 20psi and still be in the effecient center

anyone else correct me if im wrong l


Modified by bugster at 11:50 PM 1/23/2005

 

I checked out your calc and it seems pretty close. The vertical scale is the Pressure Ratio, to you go up to 2.463 and draw a horizontal line, then on the bottom scale, go to 37 and draw a vertical line. Where they intersect is the efficency point the turbo is operating at at that boost level. You want the point to be in the high 70%'s


Modified by Buzzbomb at 11:40 AM 1/24/2005


Modified by Buzzbomb at 12:02 PM 1/24/2005

 

To get a slope, adjust the RPM. Plot several (3 or 4) points. Usually you go 50% of redline, 75% of redline, and redline. This is where the turbo will be working the hardest. Again, you want to stay away from the surge line, (dotted) and stay in the highest efficiency as possible so you really aren't looking for a slope persay.

This turbo should / would good for you. B16 I assume? Try plotting the same numbers against other maps just for comparison and then make a decision.

 

d16 mini me with z6 head.

i used other calcs and got lower numbers for both the PR and the air flow

using the following formulas...

(CID x RPM) / 3456 = CFM

CFM x VE = Corr. CFM

Corr. CFM x 0.069 = 11.81 lbs/min

(P1 + P2) / P2 = Pressure Ratio


what one do i go by?