I do not have any experence with the ez sytem, but I do with the classic. Before going to carbs, either get a classic or the new ecm.

I had CMI headers and had a o2 sensor installed at the high point of the collector. Never had a problem.

Do you self a favor and get a holly hp efi way more features basically the same price.

The EZ-EFI uses a nice throttle body set up but the controller is VERY limited. There are nowhere near enough parameters or features to make it worthwhile over a good carburetor. If you could get FAST's new marine XFI and a harness to run that Tbody then you'd be set. Unless you have a custom built exhaust you're gonna want to be able to turn off your O2 sensor after the tuning is done. I've run a FAST T-body with the Holley HP ecm and it worked great. I'm sure if FAST has a harness that is compatible with the XFI it would work really well too.

Well you guys are all p1ss'n in my wheaties. I already own two of the EZ xfi units, and paid good money for them. If I have to buy another pair of controllers, I may as well put the carbs back on.

Use this as a learning experence, check with OSO first before spending $$$$

Know Before You Buy
 

This is sometimes a familiar theme here on the OSO technical side. Boater buys a suppossedly great new high tech product that is by the way designed and marketed primarily for automotive aftermarket use and then is also told by the "techies" at the company selling the product" Yes, this product is absolutely compatible and good for marine performance engine use!" ! only to find out after a major investment in time and money that the product IS NOT!

This why I think a lot of performance boaters contemplating new systems and expensive parts upgrades should do a lot more investigation and get references on these products before they step up make a big dollar investment and then find out the manaufacturer and their tech people did not have a clue or where more interested in the sale than in the RESULT!
Lets face it the marine performance engine enviroment is different than the automotive engine enviroment and even though you may want very badly for one of these products to work trouble free and well on your boats engines, IT AIN'T ALWAYS GONNA HAPPEN! Stop wish'in, start mak'in what you want as an outcome happen!
Good qualified knowledgable people here on OSO can usually save you, time ,money and grief. Use the resource, then you won't have to come on the forum and tell us the sometimes sad story after the fact.
JMO

Best Regards,
Ray @ Raylar

Hey guys , Yes I do stand corrected , Its the water temp that needs to be at 160 to get off the choke mood off. Anything under and it dumps fuel, just like a carb on choke. Its been a year and still after countless calls with fast eng ,and a highly respected efi gods(LOL) still not running correct .( ran like a bat out of hell on some carbs ) the conclusion is this. Its made for a car /truck. and as such we believe the learning curve is as such . as of last week I pulled it off and installed it on a 550 hp 351/stroked393 in a Lightning truck. runs great "IMAGINE THAT" IM AWAITING THE NEW 2.0 XFI MAIRNE ANY DAY NOW .
The new xfi has a new adaptive learning curve and self tuning built in. FOR A MARINE APPLICATION. after wasting a year I cant wait to install her. she's costly but will be well worth every penny . let you know how well she turns out ..

My advice is unless fast designs a marine version of the EZ .. STAY AWAY !!!!!!!!!!! GO XFI

To Raylar , Your correct as well . but when I purchased them from a friend who worked there. the Eng straight told me they have never tried them on this type application . my understanding there was 3 people who was willing to try them . one failed quickly and sent them back to fast. one got them running and myself . I do have it running , but its so inconsistent you don't ever know if your going to get a good day or bad one.. its almost as if it will not keep the tune.. ( this is why we believe the learning curve ,is reverting to a automotive curve).
I will not say nothing bad about fast eng or there sales. As far as I know there not selling them to marine people with out the warnings . but there are new people in sales .cant speak for the new guys ...
sorry I just had to clear that up .. F.A.S.T. IN NO WAY , tried to pull a fast one , for the sake of a sale !

good luck to all you efi guys ..
by the way I cut a 2'' hole in the outside pipe then a hole just large enough for the o2 in the second (exhaut pipe) welded the bung to the inner made a overlay of 1/2 cut hole to exact diameter for bung . welded the overlay to the bung and the overlay to the outer. no leaks and worked great . polished it and it even looks great to ( stelling exhaust and tips )
have a great one on the water and ill see ya next year !!!

PowerPLay Johnny B

well I can tell you any EFI that runs off a 02 without a dry system is going to be a issue, does not take much water at all to kill them...we have killed 3 @150ea...we built a EFI using megasquirt that does not run off a 02, but it makes easier to tune reading it, have it close and love it so far...

I would be going with a Holley HP EFI system, find someone to tune the motor for you and you will be much happier. Thanks me later!