500 efi with a 525 cam installed
06-08-2018 | 12:33 PM
#1
Thread Starter
Registered
Joined: Sep 2017
Posts: 31
Likes: 0
500 efi with a 525 cam installed
Ok, I just recently had my 500 efi engines rebuilt. I had the engine builder install 525 cams. They dynoed out at 524 hp and 530 hp. Put them in boat, builder also checked tune while in boat, I also installed wide band air fuel guages for both motors and that was between 11.8 and 12.5. These engines are installed in a 36 foot baja. Last year the boat with 500 efi tired engines at 556 hrs went 71 mph at 5200 rpms. Now with the 500 efis with 525 cams runs 70 mph at 5000 rpm. I feel like I went backwards and the boat should run 73 to 74 mph at 5300 to 5400 rpm. Intakes and throttle bodies are stock. Just reaching out to see what the thought is on this. I'm thinking of buying bigger throttle bodies and tune it agian afterwards. What's your thoughts.
06-08-2018 | 01:23 PM
#6
Registered
Joined: Oct 2013
Posts: 2,888
Likes: 148
From: SF Bay Area
Bigger cams generally just move the HP and torque up into higher rpms and smaller props may actually help you get up and get moving. A 36’ Baja is pretty heavy. Give Eddie Young a call. Bigger injectors may be in order to take advantage of the upper power range?
06-08-2018 | 01:32 PM
#8
Thread Starter
Registered
Joined: Sep 2017
Posts: 31
Likes: 0
I agree with you BAJA Rooster on the props I am only running a 26 pitch prop before and after engines were rebuilt. Also if I wasn't getting enough fuel wouldn't that show up in the wide ban. I have sensors in my tail pipes to make sure its not running lean or to rich.
06-08-2018 | 01:35 PM
#9
Registered
Joined: Nov 2004
Posts: 14,068
Likes: 3,668
From: On A Dirt Floor
Are e sure the tune is spot on ? Doesn't sound so with some AFR#s in the 11.5's.
ArcticFriends just got 40-50_hp on a customers set of engines doing more fine tuning. It happens ! Thread is a few away from this if you click on "New Posts"
ArcticFriends just got 40-50_hp on a customers set of engines doing more fine tuning. It happens ! Thread is a few away from this if you click on "New Posts"
06-08-2018 | 01:38 PM
#10
Registered
Joined: Oct 2013
Posts: 2,888
Likes: 148
From: SF Bay Area
If you had a fuel pressure issue I’d believe that it would show lean but you may have a fuel volume issue which acts more like having too small of a carb. I can be wrong as these big beast of engines are new to me and rather archaic from what I’m use too.
