Please Help Slow Rxp

[walt kay]

I am a long time reader but this is my first post. I would like to start by saying this site is great and thanks for everything. I have an 04 rxp and the best top speed I can get is 73.5 gps this is the list of mods any input would be great.
Sealevel .5 fuel saltwater
Impros repitched solas 13-18 to 14/20
SS wear ring
Ifizzle I/C
Green wheel 9.2-9.5 LBS Boost
Opas block off R & D
R & D input grate
Gridle kit
Trim wedge 2.5
Flaired J pipe
Shorty waterbox
Pro series reduction nozzle 8/mm ring
DYI front air intake
Skegs
free mods

[RXP-REX]

Well for starters you are losing 1mph from the R&D intake grate. I also hear saltwater tends to be 1mph slower than fresh water. What RPM are you turning?

[walt kay]

rpm are 8050 to 8100 with 81 mm ring. should I change the intake grate?

[RXP-REX]

That's up to you. The R&D grate is supposed to be faster in chop than the Riva grate, but if you're going for top speed in smooth conditions the Riva grate is definately the way to go.

[DaveC]

Do you have a rising rate fuel pressure regulator or larger injectors ?

[walt kay]

42# injectors

[DaveC]

I would try the Riva intake grate and a 15/20 impeller, they are proven in many setups similar to yours.