Thread: gpr headachs
08-12-2006, 07:54 PM #1
after reading the post aboutt he 2006 gpr with tis step by step mods that is running 77 im wondering why i only avg 69.i have hit 70.6 @ 7200 rpms at my highest. today i only hit 68.7 at 7250 rpms. my efi is a little out of whack but i dont think it should be hurting me. my ride plate is not moded. carl put my jetworks in and at that time he fixed my pump shoe akignment so thats not it. any other ideas? my compression is only 130 psi on every cylinder, i shouldnt it be higher witht he heads? on the trailer when im clearing out the exhaust of water it backfires. thanks
i ordered the stock hoses to put my sound suppression back in.
i haver worx sponsons installed for CC. but they are as far up as they can go. i do notice a solid "sheet" of water coming of them now. is that killing my speed that much?
Last edited by MDGPR; 08-12-2006 at 08:10 PM.
08-12-2006, 07:56 PM #2
because he has a package ski
08-12-2006, 08:12 PM #3
This is true.... But shouldn't he be over 70mph easy?
08-12-2006, 10:09 PM #4
- Join Date
- Apr 2006
- South MS
Your compression seems low for having riva heads, could it be your gauge? My stock compression was 135lbs. Theres no doubt the package did help my ski. I was also running a highly modded riva plate, and on my ski the r&d plate was consistantly slower. Theres alot of speed left on the table with your plate though. I was also running an 800 grate, this consistantly gave me 1.5mph and you don't have the keyway. Are you making these runs in superman? That can add 1mph+
So if your at say 70mph
add 800 grate = 1.5mph
modd plate at least = 2mph+
ss box and keyway= 1mph
These things should put you at 74mph+
08-12-2006, 10:35 PM #5
not superman, cant find nice enough water but i am crouched down with the weight in the back.
would the worx sponsons hurt me?
its a cheap gauge i got from advanced auto parts for like $35
08-12-2006, 11:02 PM #6
alot of the numbers you see are on flat glass. check your pump shoe
08-12-2006, 11:10 PM #7
i want the pump shoe to sit lower then then ride plate right? or is their something else to it?
08-12-2006, 11:34 PM #8
what the heck is a race filter? I never know what a race filter is. What is a race filter? Whats a race filter do? What kind of gains did you see?
08-13-2006, 08:34 AM #9
is about half way fown, known as the power plenum. its just a less restritive air filter. i have only seen 5 mph over everything i did so for me it didnt do much. but i think its needed once you get reeds and heads and what not.
08-13-2006, 01:39 PM #10
my 05 would read 130s with a napa compression gauge.... got a snap-on and picked up almost 20psi.
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