400 Rpm Increase
 

Made some minor modifications over the winter on some 500EFI'S in a 2001 358 and picked up at lst test 400 RPM'S.

Hope to get out this weekend and do a little more dialing in and testing. With a change to a set of modified Brodix Heads and a recurved fuel managment and increase in REV Limiter these were my only modification. Everything else left alone.

Re: 400 Rpm Increase
 

That sounds promising! Let us know what you pick up in MPH. Steve

Re: 400 Rpm Increase
 

I did almost exactly the same thing to my 358 over the winter with the addition of a different cam. I'm still working with props right now but the mods picked me up another 500 rpm and so far another 4+ mph on gps using the same props. I have a set of hydromotive P5X's on the way right now.

Re: 400 Rpm Increase
 

Jerry,
That sounds good, who did your remap of the ECU? What props are you running and rpm now?

Let me know if you have any plans to get to our side of the lake.

Rick

Re: 400 Rpm Increase
 

Drag "N"

What was your max rpm last year? That 400 rpm should really make a difference.

I'll be chasing you at SOTW this year. :eek: :drink:

Roger

Re: 400 Rpm Increase
 

Rick

Are you getting a new 42?

Roger

Re: 400 Rpm Increase
 

;Hey Roger,

Only time I had the boat out was too test to see if everything was ok and then get a plug reading. At that time I had a set of 30 lab's on and the boat pulled the same RPM'S as last year with 28's. That where I got my RPM increase from. I hope to get out more this weekend with both sets and get a better base line.

Rick,would have to check with my guy that did the modifications to find out where he had the ECU re mapped.

The plugs looked like they were running a little rich, might be because of last years gas 87-89 octane and the knock sensor was kicking in or just a heat range in plug, With compression increase to 9.5 going to run 92-93 octane.

Re: 400 Rpm Increase
 

Had a chance to test some on Sunday and picked up alittle more. Now doing 5400 RPMS with Lab 30's. Still have old style speedo no GPS YET.

Last year before modifications best I saw was 5200 RPMS with Labbed 28. I THINK I HAVE ACCOMPLISHED WHAT I WANTED TOO DO. Pick up my cruise and top end without SCREWING UP the overall characteristics of the stock EFI.

Still going to upgrade a few more things that will bolt on and maybe I will see a little more but for right now I happy. NOT TOO BAD 80MPH BOAT WITH A HEAD AND STAND UP SHOWER.

Re: 400 Rpm Increase
 

Are you going to have those props for the milk run on the 11th?

let me know how they go !

roadrunner

Re: 400 Rpm Increase
 

I'm not going to be able to make the run this year - kids have a recital that Saturday. We will be up there for the 4th though. I got a chance to run the new props at this weekends Queens Race and really like them. I like the mid-range with them and the amount of tab needed now is next to nothing. I ran with 0 tab most of the time whereas before I was always at least into the 4-5 range with the standard 4 blade Bravo I's. I need to talk with Throttle Up to see if they can tweek them for me to pull out a few more rpm but other than that they were great.