Marty can I get your opinion
Posted: Tue Jan 18, 2011 2:19 pm
I have a naturally aspirated bbf 562 cid conventional head (p-51) in a 2400lb chassis mustang with a pg transmission. The engine was dynoed on q-16 and carb. I have switched to injection and m-5 methanol
dyno sheet
RPM TQ HP
5500 763.9 800
5600 767.1 817.9
5700 767.5 833
5800 771.3 851.8
5900 776.2 872
6000 786.9 899
6100 785.5 912.3
6200 780.9 921.9
6300 776.5 931.4
6400 768.5 936.5
6500 760.2 940.8
6600 752.9 946.1
6700 745.2 950.6
6800 734.2 950.6
6900 724.1 951.3
7000 713.3 950.7
It has 60' 1.07 -1.08 , (1.05 1 time) in mine shaft air and normally around 1.09 - 1.12 depending on the track. Et is around 5.03-5.10 around 135-137 mph 1/8 mile. I have ran 4.86 gears and 4.30 it seems to like a higher launch rpm (6000 rpm) with 4:30 gears . Not near as sensitive to launch rpm with 4:86 but et's very close with both gears.
I am running an 8" spragless converter stalling about 6350 rpm. 105" circ tires , shifting at 7200 and crossing the line about 7250 -7300 rpm. I have ran it to 1000' with 4.86 gears and it et 6.665 @ 7600 rpm.
Do you think I am leaving much on the table , have though about trying 5:13 or so gears ?
dyno sheet
RPM TQ HP
5500 763.9 800
5600 767.1 817.9
5700 767.5 833
5800 771.3 851.8
5900 776.2 872
6000 786.9 899
6100 785.5 912.3
6200 780.9 921.9
6300 776.5 931.4
6400 768.5 936.5
6500 760.2 940.8
6600 752.9 946.1
6700 745.2 950.6
6800 734.2 950.6
6900 724.1 951.3
7000 713.3 950.7
It has 60' 1.07 -1.08 , (1.05 1 time) in mine shaft air and normally around 1.09 - 1.12 depending on the track. Et is around 5.03-5.10 around 135-137 mph 1/8 mile. I have ran 4.86 gears and 4.30 it seems to like a higher launch rpm (6000 rpm) with 4:30 gears . Not near as sensitive to launch rpm with 4:86 but et's very close with both gears.
I am running an 8" spragless converter stalling about 6350 rpm. 105" circ tires , shifting at 7200 and crossing the line about 7250 -7300 rpm. I have ran it to 1000' with 4.86 gears and it et 6.665 @ 7600 rpm.
Do you think I am leaving much on the table , have though about trying 5:13 or so gears ?