Thread: just GPS it here are my speeds
05-21-2007, 10:02 AM #1
just GPS it here are my speeds
Hey guys went out yesterday and gps my GPR got 66.4 not bad but was looking around 68-70 I don't know how much rpm I'm turning but going get the a head to raise my compression. I think that my pump is loading up too much and not enuff power to push the impeller I have? What you think I should do to get around the speed I'm looking for.
05-21-2007, 10:18 AM #2
That prop is probably a little too big.
Get a good aftermarket tach to record your rpms.
05-21-2007, 10:29 AM #3
Mill the stock head, that will help you turn the Dynafly.
You should be seeing 70+ with those mods and head mill.
You definitely need to get a good aftermarket tach.
05-21-2007, 10:42 AM #4
have you got stock angle on the ride plate????
05-21-2007, 10:47 AM #5
need better info..which grate ? efi settings ? your altitude ? angle on the plate ? trim tabs ? wfo can set you straight w/ your efi boat......I would cut the head to get 140-150 comp. and get a jims plate.
05-21-2007, 10:48 AM #6
05-21-2007, 10:57 AM #7
Wfo give my settings already just need to get my tach right now its 5518
05-21-2007, 11:01 AM #8
05-21-2007, 03:18 PM #9
I would leave the compression alone for now. That ride plate is holding you back, there is 3+ mph right there, 800 grate is 1-1.5 more also.
You cannot tune properly without a tach!
05-21-2007, 07:30 PM #10
What is the difference between using a 1200 grate and a 800 grate on my GPR does it load too much?? Which one will be great with my mods I have?
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