Data, SOme Room for more boost?

[Trctnless]

1st 2nd gear pull very cold outside during these runs

RPM Timg LB/MIN O2
3868.0 28.0 6.85 0.78 0.0
4400.0 15.0 13.8 0.96 0.0
4964.0 15.0 15.92 0.96 0.0
5604.0 12.0 21.43 0.98 0.0
6132.0 15.0 24.17 0.98 0.0
6640.0 19.0 26.18 0.98 0.0
6220.0 21.0 27.09 1.0 0.0


2nd Gear Pull
RPM Timg LB/MIN O2
3960.0 20.0 9.84 0.94 0.0
4276.0 22.0 9.02 0.94 0.0
4632.0 26.0 9.7 0.38 0.0
5172.0 10.0 20.35 0.96 0.0
5728.0 12.0 23.08 0.96 0.0
6284.0 15.0 25.31 0.96 0.0
6736.0 17.0 26.39 0.96 0.0
7164.0 16.0 28.14 0.96 0.0

3rd Gear pull RPM Timing TimG O2 O2 Trim
4016.0 26.0 7.6 0.88 0.0
4216.0 12.0 17.0 0.96 0.0
4812.0 10.0 20.8 0.94 0.0
5132.0 10.0 22.56 0.94 0.0
5384.0 13.0 23.67 0.94 0.0
5704.0 14.0 24.72 0.94 0.0
5988.0 17.0 25.49 0.94 0.0
6232.0 16.0 25.78 0.94 0.0
6496.0 16.0 26.64 0.94 0.0

rewire/450's /B28 @ 13-14psi/ see prof for other mods.

Question. How much more air lb/mn, can 450's and the rewired stock pump accomdate? Looks like a wee bit of knock up top. I'm simply astonished with the lb/min #'s @ such low psi. and from the looks of things perhaps psi can be turned up a bit? The MAFT is set to 5% rich MID/HIGH

 

[Kevin Jewer]

I dont think you are knocking. You have to remmeber that if you arent leaning out to compensate for larger injectors (doest apply to dSMlink) the max timing the ECU will give is 16-17 psi, if you are on the max airflow table, which you may or may not be on at 28 lbs/min. If you are knocking, its not much. I would expect you to be leaning out a litte up top, though it doesnt seem like it. Example, with a 14b max flow was about 30 lbs/min, and I would run out of fuel at that level on pump gas (fine on race gas) with 450s. I would proceed carefully at this point. If pump gas is your thing, I would upgrade now to be safe, and enjoy a couple extra degrees of timing.