FAST EZ EFI conversion, anybody tried it yet ?
 

I picked up a pair of FAST EZ EFI kits at a swap meet. I am contemplating trying it on a hp500 carb engine. My concern is water on the O2 sensor with the Gil exhaust. The risers are dry till the transom, but I have heard there is a fair amount of reversion with the Gil manifolds. I would weld in an O2 bung in the riser, right at the manifold / riser joint.

Has anyone used the FAST EFI system on a boat ?

Anyone want to swap a complete pair of Merc hp500 EFI for the new in the box FAST systems. I have two sets, complete with fuel pump kit and harness.

Follow this link it should help you with your project

http://www.ebay.com/itm/OXYGEN-SENSO...item2eb64afaf6


Cliff

I haven't used it on a boat, but I have 2 FAST easy efi throttle bodys mounted on 540 in a 67 Chevelle, Im going to fire it in the next week or 2 let you know how it works out....

Why not make two 1"alum spacers to go in between the manifold and the riser,tap out for your sensors.They is no water reversion at the bottom of the riser only up towards the end.I did it on eddie marines.JOHN SR

I make 2 and 3 inch spacers. The spacers are a easy way to add an oxygen sensor into the exhaust stream. A 1" spacer doesn't leave any room for a socket to put the sensor in, since the sensor socket size is 7/8".

How do you deal with the miss-alignment at the tail pipe caused by raising your riser pipe with a 2" spacer ?

There are various tubing bends available....the easiest is when we get to put transom exhaust in a virgin transom :) Generally it's not an issue with mandrel bent pieces available.

fixx
 

try to drill and tap the center of the intake manifold just below and inbetween the 2 center bolts,,you have a exhaust port their that is soppose to heat the intake cross over for the choke on a duel plane intake..or like suggested use a spacer with athe hole in it but under the turbulators...

We've run the Fast mpi in our boats for 15 years without a problem. I don't think the EZ would be a bad choice.

Mrfixxall:
That is a pretty clever idea. Unfortunately I have aftermarket heads W/O a crossover.

I am considering making an O2 bung and poping it through the riser pipe just above the manifold. I think I could TIG weld it inside and out. Anyone else try this ???

You can buy a stainless 02 bung from places like Summit or Jeg's pretty cheap. They are easy to weld in when you can get to both sides.

GPM: Thanks for the tip, I'll look into it. I figured I could use a shorty tip on my TIG torch near the entrance to the pipe and have pretty easy access for welding.

There is a much easier way to weld in the O2 bung. This was explained to me by Eddie Young and you don't have to get to the inside. Works great. Using a step drill, drill through the pipe leaving the outside hole slightly larger than the inside hole. Take a ball peen hammer, center on outside hole and hit it with another hammer, rolling the metal down to the inside tube. Weld the inside and outside together, then sit the bung on top of hole and weld in place.

Snapmorgan: Sounds like it will save a ton of time, and be a whole lot easier than trying to TIG inside the tube. THANKS. Sometimes the best solutions are the easiest.

Either way, as long as it's sealed will work.

I DO HAVE A EZEFI ON MY 572 . ITS BEEN A PAIN IN THE ASS.. BUT ILL MAKE IT EASY FOR YOU .
my troubles will be your easy route to succsess with it .
# 1 the ezi system is very far different from XFI and mpi . the other is the o2 HAS to be 12 inches from the exhaust outlet and 8 min of 6'' from the manifold or header collector . also ! the system HAS TO BE RUN DRY . water dumping into the exhaust with all the fancy collors and crap wont work .
It will falseify the reading's of oxygen as fresh water will cool and and make the o2 read more oxygen in the exhaust and make it run fat . Hense the distance of the o2 sensors from outlet and inlet of the o2 .
# 2 if that o2 sensor gets wet in any way . SEEYA ! YOUR STUCK DEAD IN THE WATER ! AS THE COMPUTER WILL DUMP ****LOADS OF FUEL IN THE MOTOR AND FILE OUT THE PLUGS IN ABOUT 4-6 MINS, due the the fryed O2 . this is not a educated guess either !!
# 3 the o2 will not work until the water temp reads 160 degrees ... sorry but unless you have a close loop water system (airboat , trawler ,etc) your once again SCREWED .. BUT JUST WAIT , THERES A EASY SOLUTION .
since boat engines only reach up to 120 and normal is around 80-100 . you just need to simply add a resistor to the line . @ 160 degrees the ohn reading is 433. I used a 350 ohm resistor . and solved the issue. it takes a few mins to warm up before pulling away from the dock . but if your concerned with choke at cold temp then just simply hook a relay and toggle to it ..

ALL THIS SOUNDS EASY , BUT ITS BEEN MONTHS OF DEALINGS WITH IT .IT FINALLY WORKS CORRECTLY . AND WORKS LIKE A DREAM .LOVING IT NOW ... TAKE THE ADVICE I GIVE YOU !
TRUST ME IM ON FIRST NAME BASSES WITH ALL THE TECHS AND ENGINEERS AT FAST LOL ..
ANY QUESTIONS HIT ME UP .. THANKS POWERPLAY JOHN ..

1. DRY EXHAUST
2. A 350OHM RESISTOR FOR TEMP SENSOR :)
3. GOOD TO GO ......

I don't believe this is true with the newer heated style O2 sensors. Mine is up and running in about 8 seconds regardless of temperature. I use the spacer with my setup.

This FAST EZ efi fuel tuning system is obviously an automotive type system and when its applied to a marine engine, the setup, configuration and dial in seems a lot more complicated and involved than many boaters might have been previously thinking. I would think FAST should for the moderate cost of this system try slight reconfiguring and equipping so that it can be more easily adapted to existing marine performance engines. There will be problems of setting up all dry exhaust and certain distance spacings for O2's in may marine exhaust systems and this is going to be a major hurdle and problem for many hopeful users to get passed. What does FAST say about this and are they really advertising and selling this as a marine system?
Sounds like this so-called Easy system needs a bit more tweaking on FAST's part?

Best Regards,
Ray @ Raylar

I talked to FAST, and they say "no problem" using it on a boat. I asked about water temp, as I run 160 degree stats, and usually stay about 150 - 160 unless really pushing it. They said that in reality, the system starts learning around 140 degrees. I also asked about a water logged O2 sensor. They said that it would revert to the standard fueling tables in "limp home" mode.
If all else failes, I will just go back to the carbs I guess.

Haxbyspeed here on OSO seems to have had some good expierence with this Fast-EZ system I believe. You might ask him about these isssues with setups and O2's.

Best Regards,
Ray @ Raylar

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!