Thread: engine performance w/new prop???
06-16-2008, 10:42 PM #1
- Join Date
- Jun 2008
engine performance w/new prop???
I recently upgraded my 07 GP1300 to a riva ride plate and intake grate and a solas 14/20 impeller(what the Riva guy recommended). the ski doesen't seem to have the holeshot or top end that it did before, just a bit more midrange pull. Noticed last weekend that my RPM's are about 1000 less than before w/ the throttle wide open. Is the engine not powerful enough to push the new prop. if so what minor enine mods can I do to change this. also, how much more fuel would I burn if I went with the complete Riva stage I kit. any help would be appreciated. thanks.
06-16-2008, 11:10 PM #2
you could've kept the stock impellor on. you will need more mods to turn that 14/20. i would probably put the stock prop back on til you can get atleast the stage one kit. now f you put a keyway in and raised compression you might be able to turn that prop. with my mods i turn a 14/20 dynafly at 7060. also how are you measuring rpm's? you stock gauge cluster is worthless. invest in a tiny tach and a gps to get acurrate reading.
06-17-2008, 08:03 AM #3
about 1000 less than before w/ the throttle wide open.
This is a real problem, if true I would suggest you do not run the motor again
that impeller should only drop your rpms a 100 or so
something else is going on
I'd suggest you start by doing a compression check
do you have a D plate installed?
Last edited by philip_gpr; 06-17-2008 at 08:39 PM.
06-17-2008, 04:12 PM #4
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- Jun 2008
I am using the stock tach to measure RPM's so my guess at about 1000 RPM loss probably isn't accurate. I don't have any other mods. just the intake grate, ride plate and impeller. also, how much more fuel would I burn by installing the stage I kit. and how difficult is it to install the waveeater clips?
06-18-2008, 06:56 AM #5
There is no waveeater clips to install on an 07. Instead of buying stage 1 kit you could piece together your own "kit" and yield much better results.
Few things that come to mind to get are
Tach (a must when doing mods)
D-plate (gets rid of cat)
gut your stock airbox
get your head milled (which you would then need efi controller)
3 or 4 degree keyway (pain in the ass to install but can be done if mechanically inclined)
also reinforce your pump tunnel
Depends how much you are looking to spend. Most of the work can be done with basic tools and basics mechanical ability. You can find out how to do anything on this site.
06-18-2008, 09:17 AM #6
Give Jim at Jim's Performance a call he can def. help or Richard with WFO Performance.I would at least suggest a tachometer, mill the stock head to raise the compression, and gut the air box and run the E.F.I. controller.....This along with the 14/20 should net you pretty good results and if dialed in properly should get you to or close to 75 M.P.H. You may also consider having Jim cut the ride plate for you as well.That alone can net 3-5 m.p.h. when set up right!Take your time and search this site it has alot of good info. Take your time read alot and be patient and go slow.
06-18-2008, 12:53 PM #7
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- Apr 2006
- panama city beach 'fl
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