LB/MIN of the 13BT? I have two different results.
10-19-06, 11:12 PM
#1
LB/MIN of the 13BT? I have two different results.
OK, then what is a 13BT lb/min rate??
On the first sticky of this forum I read JEFFSHOOTS formula for calculating CFM. Then after checking out the link that JZ 97 SS 1500 posted i got a totally different figure:
Jeffshoots formula I calculated equals about 578.79 CFM or 40.50lb/min @7000 rpm.
The site by JZ 97 SS 1500 says that the max lb/min rate of a 13B is 20lb/min @7000rpm
I am trying to figure out which trim to use in conjunction with my TO4B.
H-trim is at 72% effeciency with 40.50 lb/min @ 2.0PR BUT with the 20lb/min it is at surge limit.
S-trim is below 50% effeciency with 40.50lb/min @ 2.0PR OR 72% effeciency with 20lb/min
V-trim is @ surge limit with 40.50 lb/min @ 2.0PR OR 72% effeciency with 20lb/min
I got all these figures off of the comp maps at Turbonetics site w/ their TO4B.
On the first sticky of this forum I read JEFFSHOOTS formula for calculating CFM. Then after checking out the link that JZ 97 SS 1500 posted i got a totally different figure:
Jeffshoots formula I calculated equals about 578.79 CFM or 40.50lb/min @7000 rpm.
The site by JZ 97 SS 1500 says that the max lb/min rate of a 13B is 20lb/min @7000rpm
I am trying to figure out which trim to use in conjunction with my TO4B.
H-trim is at 72% effeciency with 40.50 lb/min @ 2.0PR BUT with the 20lb/min it is at surge limit.
S-trim is below 50% effeciency with 40.50lb/min @ 2.0PR OR 72% effeciency with 20lb/min
V-trim is @ surge limit with 40.50 lb/min @ 2.0PR OR 72% effeciency with 20lb/min
I got all these figures off of the comp maps at Turbonetics site w/ their TO4B.
10-20-06, 07:35 AM
#2
Racing Rotary Since 1983
iTrader: (6)
the 2 rotor 13 series motor requires approx 1.92 CFM to make one rwhp.
if, for example, you want to make 400 rwhp you need:
400 X 1.92= 768 cfm or 768/14.29= 54 lbs/minute.
there are alot of other considerations w regard to sizing turbos.... what are your specific objectives?
howard coleman
if, for example, you want to make 400 rwhp you need:
400 X 1.92= 768 cfm or 768/14.29= 54 lbs/minute.
there are alot of other considerations w regard to sizing turbos.... what are your specific objectives?
howard coleman
10-23-06, 10:00 PM
#4
Yeah, I would like to find out this information too.
I assume that porting plays a roll in this, but im running 9.4:1 compression too and am not sure about that.
Aiming for 300-350rwhp depending on boost (pump gas at all times), but would like to keep a 3" hiflo cat.
This is going to be w/ a hybrid. I have a h-trim compressor only right now and was thinking of doing a full t04b compressor housing and whatnot. But I might need a tad bit bigger for my goals w/ a cat.
Interesting to see all of the t04b maps
-Ben Martin
I assume that porting plays a roll in this, but im running 9.4:1 compression too and am not sure about that.
Aiming for 300-350rwhp depending on boost (pump gas at all times), but would like to keep a 3" hiflo cat.
This is going to be w/ a hybrid. I have a h-trim compressor only right now and was thinking of doing a full t04b compressor housing and whatnot. But I might need a tad bit bigger for my goals w/ a cat.
Interesting to see all of the t04b maps
-Ben Martin
Last edited by Node; 10-23-06 at 10:08 PM.
10-24-06, 11:45 AM
#7
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What manifold pressure are you using to calculate these mass flow rates? If I had to guess it looks like one of them is using atmospheric pressure, and one is using 1 bar.
Originally Posted by FC3S Murray
Jeffshoots formula I calculated equals about 578.79 CFM or 40.50lb/min @7000 rpm.
The site by JZ 97 SS 1500 says that the max lb/min rate of a 13B is 20lb/min @7000rpm
The site by JZ 97 SS 1500 says that the max lb/min rate of a 13B is 20lb/min @7000rpm
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10-24-06, 12:13 PM
#8
Senior Member
Aiflow rate of 13B
I designed a calulator based on only:
1) AFR
2) Fuel flow
PM me with your email if you are interested. Here is some info:
https://www.rx7club.com/showthread.p...low+calculator
Justin
1) AFR
2) Fuel flow
PM me with your email if you are interested. Here is some info:
https://www.rx7club.com/showthread.p...low+calculator
Justin
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