Thread: New Numbers - NonPorted EFI
06-05-2007, 07:28 PM #1
New Numbers - NonPorted EFI
I finally got the ski in the water for some testing. First of all, the new paint job didn't add much speed, but it looks good on the water! Before stripping the ski, I had a basically stock 04 GPR with a DPlate (and a Riva EFI controller that never really worked right) that ran 64 mph on GPS. For the winter, I added the following the list of modifications:
Removed the trim tabs and modified the hull with input from Tommy (2Fast4U)
Added an 05 pump and 14/20DF (trued and finished) from Carl @ Island
Drilled and tapped cone running synthetic gear oil
R&D Mod 4 rideplate from Carl shimmed to match the pump shoe
VF3's from Carl
150PSI head from Jim (all layers used on stock head gasket)
R&D Powershot EFI controller
R&D 800 Grate (matched to the pump shoe with waay too much time involved)
R&D Power Plenum
R&D / Riva Extended Steering Nozzle
Free flow exhaust
The conditions were air temp @ 85, water temp @ 77.9, humidity @ 62% (sea level), and winds @ 20mph (moderate chop on a protected creek). I had an average speed (on Garmin ETrex) of 73.2 mph with a 3/4 tank of gas - no superman cause I'm too dang old. The tach (Tiny Tach commercial which I ain't thrilled with) held steady on 7100 rpms.
Couple of questions - I know I'm running fat on the power shot, anyone using one that would not mind sharing their settings? I would also like to pick up another 100-150 rpms, would dumping the stock 85mm nozzle and going to an 87mm add more rpms?
I wanted to dump the stock steering nozzle, but I'm not sold on the extended nozzle. Anyone have any experience with one?
I'm also thinking about sending my EFI to Ross for a bit of his magic - any thoughts?
06-05-2007, 09:19 PM #2
Good numbers for the first time out Gatorcountry. Beautiful ski also. My throttle body mods will add lots of midrange torque and usually around 1 mph on the top end. Just let me know when you are ready to go even faster, and quicker.. Ross
06-05-2007, 09:35 PM #3
is your pump shoe welded/ connected directly to your grate as one piece? I have thought of doing this but it seems incorrect or wierd to do this... I think it could yield big gains but haven't heard + VS - on the topic.
good luck and happy tuning
06-05-2007, 10:40 PM #4
There could be BIG money made if someone decided to produce these... well if there was a gain from it. I would want to buy one forsure!
06-05-2007, 10:54 PM #5
First of all, I would not suggest that anyone modify their intake grate. I started on mine because I was very unhappy with the grate I purchased from R&D. Besides plenty of casting flash, it had a couple of dimples that had been quickly hit with a grinder. The fit to my pump shoe was the worst part, on the bottom it hung down well past the shoe. There was no way I could just bolt it up and go.
All of the finish work was done by hand - NO welding or heat of any kind. I sat with a couple of files, sandpaper and a dremel to get everything fitted. In some areas, I used a small amount of JB Weld to smooth uneven surfaces out. I also reshaped some of the edges on the grate to what I felt was a better profile. My goal was to create the smoothest possible path for water to flow into the impeller.
06-05-2007, 11:41 PM #6
I have been using R&Ds powershot stage 1 and stage 2 presets (both the same) and every time i deviate from the settings i slow down.This is on my non ported 1300 06 with keyway, reeds, and 150 psi.. I have not ran it yet in the summer heat and according to Glen at R&D dont be afraid to clik down 1/2 to 1 full led in the heat, which will lean it out some..
Here are their reccomended settings.
Green LED- cruise-4
Red Led-Full throttle-3
Green and Blue crossover-0-when cruise comes on--not adjustable on yamaha gp version.
Yellow and blue crossover-4-when accelleration circuit comes on
Red and Blue crossover-4-when full throttle comes on.
06-06-2007, 04:06 AM #7
Impressive work! you didn't go with the 3 degree keyway?
06-06-2007, 04:28 AM #8
i have a gp1200r with a 1300 engine with carbs
1: ported polished
2: shaved head 140psi
4:r&d ride plate
6: 05 pump
8 g-force sponsons
thanks too the help from carl from island racing ski is running
75, to 75.6 mph with more to come happy with that but always want more
06-06-2007, 05:25 AM #9
You are the man! Thanks for the tuning info - now I know I'm running way too fat on the top and too early on the crossover. Went a little overboard on making sure I didn't lean it out.
I need to get my throttle bodies off to you, looks like your Sonic Boom's will give me at least 100 of the rpms I'm looking for.
06-06-2007, 06:19 AM #10
- Join Date
- Nov 2005
Good job GATOR! theres still plenty left in that ski. Keep up the good work.
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