Calculating Boost?

[TXLIGHTNING]

To the KB guys in the club. My truck with the KB and 4# lower & 3.25 upper is making about 12.5-13# at the lower rpm's, but at 5400rpm it is at 15#. Would it be safe for me to run my 3.00 upper? My mods are in the Sig. Thanks guys :beer:.

[TXLIGHTNING]

Common sense and Terry tells me if I do I will need to pull timing and increase fuel. I'm running 14* timing now.

[tiffo60]

im running a 4# lower and a 3inch upper and terry keeps telling me im going to blow it, but he has a negative outlook on life all together:D :throw:

[Mark #2]

See attached

[TXLIGHTNING]

See attached You sent me that once but I deleted it on accident. So with a 4# lower and 3" upper it will make 17# of boost? That sounds like a little much for me.

[TXLIGHTNING]

im running a 4# lower and a 3inch upper and terry keeps telling me im going to blow it, but he has a negative outlook on life all together:D :throw: How much boost are you making with your combo Tifton? I know the LTH help.

[tiffo60]

How much boost are you making with your combo Tifton? I know the LTH help.

15 when its cool outside, 14 on warmer days, but i may actually have a 5# lower, cant remember :rolleyes:

[TXLIGHTNING]

15 when its cool outside, 14 on warmer days, but i may actually have a 5# lower, cant remember :rolleyes:I that what it peaks at in high rpm's?

[tiffo60]

I that what it peaks at in high rpm's?

seems like it

[99WhiteBeast]

With 4# Lower pulley


Upper, ratio, boost, ET
3.50" 2.43 13.1 12.7
3.25" 2.62 14.2 12.5
3.00" 2.83 15.3 12.3
2.75" 3.10 16.8 12.1
2.50" 3.40 18.3 11.8

I'm seeing 14-15 If I can keep the dang line from not blowing off the driver side midplate:hammer:

[tiffo60]

With 4# Lower pulley


Upper, ratio, boost, ET
3.50" 2.43 13.1 12.7
3.25" 2.62 14.2 12.5
3.00" 2.83 15.3 12.3
2.75" 3.10 16.8 12.1
2.50" 3.40 18.3 11.8

I'm seeing 14-15 If I can keep the dang line from not blowing off the driver side midplate:hammer:



JB weld:evil