Lost RPM after installing RIVA Power Filter...help!

[RXP-REX]

Ok, on April 30 I was completely stock. Temperature was 50F with no humidity and I ran a 68.5 mph @ 8100 RPM.

Now I have the RIVA pro-series blockoffs and the RIVA Power Filter installed. Have not installed the Solas 14/19R or pump wedge yet. Temperature was a little above 80F with humidity at around 60 to 70%. My RPM dropped to 8050 and I saw no gain on the top end. One time only I hit 8100 RPM and got 69.4 mph.

I thought I would've gained about 150 RPM and be hitting the limiter. What could cause me to lose RPM after installing the Power Filter?

Thanks

[RXP-REX]

One thing I forgot to mention is that I also installed the RIVA intake grate, and the bolt areas are flush with the ride plate, but it does scoop down a little past the ride plate. But I think that's normal.

[Sirhc7897]

It's that extra 30F of air temperature not to mention the additional water temperature that's eating your rpms...

You can't really do before and afters on parts in dis-similar conditions as that really skews the results.

[RXP-REX]

Yes, it was very hot and humid. The hull was sweating when I put it on the lift and that was at 8 PM. But still, I can't believe I would lose that many RPM from the heat. Last year I was turning 8000 RPM completely stock in 75F with 30 to 40% humidity. So I guess I gained about 50 RPM if any.

My question now becomes: what can I do to get my RPM up more from 8050 before I put the Solas 14/19R on

Thanks

[Ultra/RXP]

The wedge will help some. But, I also agree, the humidity is as big a factor as the temperature.

[RXP-REX]

Will trimming the reverse bucket bring my RPM up some? I notice that its kinda blocking some water flow from the pump.