Finally dynoed with the HPS tubes and also a final experiment with K&N filters.
I only have a few comments:
1. The HPS tubes appear to do NOTHING.
EDIT: After further evaualtion of the dynos, old and new, I would say these are worthwhile in conjunction with K&N panel filters. Alone, not sure, but with high flow filters, reasonable bang for the buck, but a slight PITA to install.
Carefully reviewing the dynos, it looks like I intermittently lost or gained 2-3 whp at various points -- perhaps a little touch up with a tune will help.
However, if with tuning the overall gain will be less than 5 whp, I'm just going to sell these off -- worthless IMO.
2. No idea why the cone filters flow so poorly -- possibly all due to heat soak? They were shielded, but maybe not sufficiently?
No idea, but for now I would say the factory airboxes plus K&N panel filters is definitely the way to go.
Moreover, I would add that I've seen dynos where the much acclaimed Stillen intakes only make about 6-8 whp -- well below what they advertise, and the same gain you can get from just the K&N panel filters, which are like 1/4 the price...
Oh... and just to amuse myself... here's my "bragging rights" dyno. I'm at 300+ whp with std correction apparently... wheee....
Of course, N/A, I go by SAE correction (tends to overcorrect for FI, BTW), so this is fairly empty boasting...
One other thought: I'd say that N/A the Z is probably maxed out around 295-310 (figure closer to the higher end with lighter pulleys and LTH's). With similar mods, anything less than that is probably an overly conservative estimate and anything over 310 is probably a happy dyno.
I see no clear evidence of differences in drivetrain loss from MT to AT either -- in fact, with comparable mods, mine seems to puts down as much or even a bit more than the 6 speeds have on PP's dyno -- go figure.
That's all for now...
