Computer Tune, Arizona Speed???
 

I purchased the boat with the Arizona Speed and Marine 'performance' kit (extruded intake, flame arrestor, fuel press. reg. and ecu). I have since had the engine rebuilt with different heads, block and exhaust (picked up about 75hp). My question is, would it be advisable to have another tune done by ASM? I've already purchased the software and associated plugs to interface with the ECU. I've called ASM when I was first having problems with the motor (before the rebuild) and they had mentioned they could send me an updated program to download to my ECU if I provided them with a 'capture' of my data from the boat being ran. I've since had some tell me this type of tune is not always the best way to go....Thoughts anyone????

Thanks in advance!

Mail order tunes are sketchy at best unless it comes from a guy who has built a motor with EXACTLY same combination as yours. I have tuned several boats on the water this year w mefi burn and on my dyno and there ALWAYS seems to be lean and rich spots that need to be cleaned up, fwiw, Smitty

So, with that being said, is there an option (suggested contact) to do a tune without having the motor on a dyno?

^^^Yes, in the water as Articfriends suggested and does for some people. You will need a Wideband bung or two in your exhaust. In the water is 1 million percent better than a mail order tune and 500,000 percent better than on an engine dyno tune. :)

If the original tune was good, than you are for sure lean now. You need 75hp of extra gas in the new tune, plus adjustments across the rpm range. Timing might need to be changed as well.

I believe when you change the combo you should always retune and I'll go one further anytime you freshen a motor and make the slightest of changes you should retune there's no one tune fits all and furthermore when we build and tune something for a customer here on the dyno we always explain we always want to final tune for driveability in the water I don't feel you can do this as accurately as you would want it as a customer over the internet if it can be done real time over the internet then yes but to send you a file and you load it and try it I don't think your getting the best for your buck. Maybe ask the original engine builder if there's a way to data log a run and he can look at the data to make the appropriate changes. Best of luck Laz

It looks like you are less then three hours from Eddie Young at Young Performance. Contact him about doing a on water tune. He is one of the best anywhere. Don't wait too long as he gets very busy.

Padraig

Here at MEFITUNING.com I can help you out, should you wish to venture this way, or pay for me to come to you.

Thanks

I would not use ASM.

Not necessarily. Overly rich tunes can sap power too. His power gain could have been from changes that moved towards a more optimal AFR.

What power?

Whipple tunes too.

Chris - call Eddie Young. He will do it in boat, on water. Which is the best way. He did a great job on the 35'.

615.216.7449

Tell him you're a friend of mine and I sent you there - he might just give you a discount of +200% LOL

Rebuilt 500 block, Procomp AL heads, ASM intake work with CMI headers.

Thanks Terry! I'll reach out to him but may 'forget' to mention your name, haha.

Call him now to get in line - his busy season has already started.

Ditto!

Forgot to mention, I had AZSM tunes on the 575's - and Eddie was able to get in and retune.

LOL If I was closer to Eddie, no one else would ever touch my Velocity.

Padraig

I would not do a mail order tune unless it was a very simple change that the tuner has already done on the exact same engine combo.

I have done the mail order tunes and sending the ecm back and forth to get so so results is bs. Spend the time or money and get someone to tune it on the boat in the water. There are Many good tuners around and if you have to fly them
In for the day. Money well spent . Jeff wurl

I did one mail order tune that worked out good for blackhawk aka scott elgas, he had a single mefi3 hp500 efi innovation, he ported his heads and drove boat w vacuum gauge and 02 meter, i would make changes to his program and upload to a spare ecu, mail it to him, drive it, give me numbers, make changes to his ecu, pass in mail etc, got fuel dialed in perfect, was a little hassle but did work, fwiw, smitty

I did one mail order tune that worked out good for blackhawk aka scott elgas, he had a single mefi3 hp500 efi innovation, he ported his heads and drove boat w vacuum gauge and 02 meter, text me numbers, i would calculate map vs bpw, i would make changes to his program and upload to a spare ecu, mail it to him, he'd drive it, give me numbers, make changes to his ecu, pass in mail etc, got fuel dialed in perfect, was a little hassle but did work, fwiw, smitty

It helped that he lived one mile from a test lake and was one day away via mail. He would use the boat meanwile and just kept it out of rpm bands where it was rich or lean, Smitty

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Arizona Speed & Marine
 

1st I live in Columbus, Ohio and I was told to use ASM. I didn't even check any threads or reviews, I just went that direction to flash my ECU, which I had to send it back once and then Jim (@ASM) ended up sending different programs to put in because it wouldn't idle. I went from a Volvo Penta 454 with MPI to a HT502 crate engine because Schumaker Performance recommended it said everything would bolt on and work.They used my 454 cam and because It does have oval ports is why I guess. The engine has 10 hours on it and 3 of those hours were under load and spun #7 bearing and ruined the crank while I was breaking it in softly. Now Jim says, he will sell me a 502 and use my heads. Of course Chevy will not honor any warranty because it is not intended for marine. I spent $6K on the HT and another $4K to get it running. Is this right in line on how ASM operates? Any thoughts if the ECU could have caused this to happen? It was running good and sounded good until.... Also wondering if I should have this one fixed and run it, or fix it and sell it?

Did you reuse your oil cooler, what happened to old motor? Did stock oil bypass on ht motor get swapped for the higher differential one? Did you take off the stock 4 or 5 or whatever quart pan on new motor and put on a marine oil pan? I had a new zz502 on engine stand and it had a clearly smaller oil pan than a 454/502 mercruiser does.

Yes we did. The old engine is at buddies house and I am thinking I may drop my HT off at Chevy at about 25 MPH and make it goes right through their front doors! Thinking I may take the 454 and bump it up and put it back in. Yes we used the one off the 454. Yes, the 12 qt pan from 454 went onto the HT. Yes, I was told the ZZ is not a good one. But from everyone I have been in contact with, I was made to look (in my eyes) like a complete ass for letting them talk me into this POS HT502. 16K and 3 hours on this boat this summer. Going to be an interesting winter t see what I end up doing. 454 has 310Hp and thinking I am going to end up 500 and change. not looking to haul ass, because our boat is heavy. 99 Four Wins 254 Funship which is VERY rare I guess.

I second that about Eddie Young!! Just be prepared when you call to chat for a bit, because he loves to talk about boats in general. lol He is the go to guy for tuning in my opinion.