Looking for ECU advice
 

I have a 500 efi intake wiring harness ect... Its going on a 572 and will have the new Vortech XB110 V11 supercharger. I sent the ECU off to be reprogramed and was told its out of date and cant be reprogramed. Im looking into a diffrent system that I can tune or a self tuning ECU. Has anyone retro fitted one of these intakes? Any advise would be a hugh help

Who did you send your ecu too?..

The Holley HP EFI system is an easy retrofit and would work very well for your app. That intake however isn't the best match for your combo but will work and still make decent power; I'd look into a different throttle body though. FAST also has a marine version of their XFI that would work for you but, it isn't a potted unit like the Holley and has a lot less features.

Try Dustin Whipple. Even though its a Vortec, Dustin has alot of experience programing ECU's.

The only reason i was wanting to use this intake was because it was already on the boat before and has the vortech intercooler for it. Its is carburated now with a V4 J trim. I sent the ECU to Arizona Speed and Marine. After reading too many blown up motors from him on here I'm not willing to take that chance, I'll look into Holly and fast, thank you HaxbySpeed....

You wouldnt happen to have a number for Dustin Wipple would you?

Phone # for Dustin Whipple 559-442-1261. Should get you to his office.

No way that anybody is going to be able to tune an ECM for you on your setup without doing it on a dyno or in real time in the boat with an O2 sensor.

I would assume you had a mefi-3? There is only about 100+ shops these days that can tune it and 10,000 amateur home tuners that have bought mefi-burn software and did there own so not sure why "it's out of date"? You really need to have it tuned on a dyno though so who ever programs it doesn't just throw a bunch of extra fuel at it to be safe, Smitty

Listen to the artic what he is saying is true.

Although a Mefi 3 isn't the latest and greatest, it certianly isn't "out of date" and it certianly will work. There are a few that can tune it CORRECTLY. As mentioned, spend the money to have it tuned on a dyno. It is money well spent.
Where are you located?
Eddie

The ECU I have is the same one that came with the motor in 04, Im not sure which one that is. I live in Beaumont TX area. I was just thinking if I had a setup with a wideban like the Holley set up I could tune it myself. I do agree that there is no better way to tune any motor than to put it on a dyno, and if I have to I will do that. Ive had race cars but they were carburated and I can tune them but Im new to the EFI systems. Thank you guys for your help and input

What kinda boat is this going in, its one thing to drive around at 75 or 80 mph doing a tune vs 100+? The problem with tuning on the water with something that is on the edge is its hard to get "clean" safe water and do wot runs to tune things in safely . A self tuning ecu like Haxby is talking about would be a big plus for what you want to do but not a absolute neccesity. I feel bigger hp blown motors should be tuned on the dyno as there is so much going on when your boosting something and so many variables that how would you know for sure that your making max hp while dodging things in the water at 100 + mph and keep in mind if motor goes lean under boost and you don't catch it fast enough it doesn't take long to turn pistons into Souvenirs (they make great ashtrays for your buddys that smoke), Smitty

Post the part number off your ecu and we will tell you what it is, Smitty

If the ecm is square (about 3" x 3") and has the plugs going into the top of it and has the 8 digit # ending in 099 or 999 it is a Mefi 3.
Eddie

This setup is in a 04 26 American Offshore. Eddie I dont have my ECU mith me, Im waiting for it to come back from ASM but I think it is the Mefi 3. The pluggs are on top like you said. The boat will run 98 with a 30 pitch labed 4 blade and only making 2lbs boost @ 5400 rpms. Im planning on setting it at 8 lbs then doing some prop work. It never was tuned or the correct prop to begin with. Im sure ill end up going to a diffrent outdrive from the bravo xr and IMCO lower with 1.5 gears. My goal is to break 100 on a conservative tune. Bob I might give you a shout when I can get off this turnaround...

I also live in Beaumont, have you talked to any of the guys with powerboats there ? do you know George ,, Ronald or Regan ,, Mark ,, B.J. ? George gave me a couple of names, Crocket Marine in Ruby, MI. 810-324-2720 ,, Precision Marine in Kenner, LA. (504) 469-7463 ,, Full Throttle Marine in Spicewood TX. (830) 693-5591. I've spoken with all three several times. i'm taking mine to Full Throttle because Crocket is just to far and Precision mainly deals with Big Blocks. I'm going from 350MPI to 383MPI with several changes
. i am getting them dyno. i also have MEFI 3,,,

,,

sorry for last post guys ,, went to wrong post

I also live in Beaumont, have you talked to any of the guys with powerboats there ? do you know George ,, Ronald or Regan ,, Mark ,, B.J. ? George gave me a couple of names, Crocket Marine in Ruby, MI. 810-324-2720 ,, Precision Marine in Kenner, LA. (504) 469-7463 ,, Full Throttle Marine in Spicewood TX. (830) 693-5591. I've spoken with all three several times. i'm taking mine to Full Throttle because Crocket is just to far and Precision mainly deals with Big Blocks. I'm going from 350MPI to 383MPI with several changes
. i am getting them dyno. i also have MEFI 3,,,

without wanting to piss anybody off...I would get rid of all the merc junk...worthless for what you are trying to do...to many good EFI systems out there now that you can tune...unlike the merc junk..