Mercury 500 EFI
#11
VIP Member
VIP Member
there are different things you can do and in stages to boost your horsepower. Many builders can take the 500 and get it up to 560-580 and not break the bank. you can pretty much make it a 525 by adding aluminum heads as well, just wont have closed cooling. dont be discouraged, you have a great base to build from. contact the following shops.
JC performance
Richie Zul
Precision Marine
Tyler Crockett
Gellner Performance
MDG Performance
All of these guys are stand up boat folks and can offer you many options.
JC performance
Richie Zul
Precision Marine
Tyler Crockett
Gellner Performance
MDG Performance
All of these guys are stand up boat folks and can offer you many options.
#12
21 and 42 footers
Platinum Member
I built up a pair of 500EFI's last winter.....DON'T DO IT. Although we made alot of power and they sound great, I'll never do it again (fully dressed at 630 HP, 700TQ). It would have been alot cheaper to run the engines at 4,500 rpms all the time and re-build them (back to stock condition) after 200 hrs use.
#16
Masher touches my
Gold Member
Join Date: Aug 2004
Location: Phoenix, Az
Posts: 2,280
Likes: 0
Received 0 Likes
on
0 Posts
We put a Crane 741 series cam in one, reprogrammed the ECU, and did some mild port work on the heads and it made 563 hp. Also added the AZSM throttle body. The motor had valve train issue and had to be refreshened anyways, it wasn't opened up just to make more hp.
#17
Organized Chaos
Platinum Member
Thread Starter
Join Date: Jan 2008
Location: Montgomery
Posts: 30
Likes: 0
Received 0 Likes
on
0 Posts
Could you give me some prices on a ECU reflash and 2000 cfm throttlebody. Arizona Speed and Marine has a 1300 cfm throttlebody for the 500 but I think yours will hve more airflow
#18
VIP Member
VIP Member
I built up a pair of 500EFI's last winter.....DON'T DO IT. Although we made alot of power and they sound great, I'll never do it again (fully dressed at 630 HP, 700TQ). It would have been alot cheaper to run the engines at 4,500 rpms all the time and re-build them (back to stock condition) after 200 hrs use.
#20
VIP Member
VIP Member
i ahve a 525 cam in mine and they sound great, idle like a dream and do what ever I want. they still arent the fastest, but this year I'm going alum heads and am shooting for 625. Mark and tyler know fuel injection like no one else...check with them and weigh out your options....you wont be dissapointed.