EFI Systems
 

I think I'm going to switch over to EFI this winter. It seems that Holley has a new 8 injector throttle body (sniper) that will support up to 1200 hp and FiTech has a system for 800 and 1200. Both have the ECU mounted on the actual throttle body for really easy installation. Has anyone ran the FiTech? The only downside I can see is that you have to run the O2 sensor all the time with the Fitech. The Sniper hasn't been released yet so the info is semi limited on it. I have dry exhaust so I'm not really concerned about the O2 issue. So any input on this subject.

Do you have to have a fuel return line with this system?

I think the holley has a return line, I believe the FiTech its optional. However not a big deal, my tank has fuel return bungs in it.

That was why I asked, are the return ports factory? I don't have them on my tank. Also I know to be coast guard compliant there are some requirements for return lines. (not trying to be safety police, just mentioning it).

The Fi Tech offers the command center that you can dead head a mech pump into. Fi Tech is also coming out with a MPI kit for not much more money. From what I understand the Sniper is not ideal for blown applications.

This is how I've ran returns:

http://www.cpperformance.com/c-500-f...s-returns.aspx

http://www.cpperformance.com/images/.../620-76300.jpg

How do these two price up against each other, for lets say 700hp..........

If you already have a strong electric fuel pump and a return line both TBs are $995 for up to 600hp. Holley you can lock in a map where as the Fi Tech is strictly closed loop. When I spoke with them a few months ago the only issue with marine use was the O2 sensor getting wet. After playing with my wideband and seeing how much the mixture varies just from the time of day I'd go closed loop if that's an option.

Super Chevy's list.
http://www.superchevy.com/how-to/eng...-market-today/

I was really digging the FiTech system for my upcoming project until I heard you can't lock in a tune. I thing on a boosted marine app that having an O2 sensor flake out and lean the engine out is not something I want to gamble on. Holley isn't out into reality yet either but also won't handle a blow through configuration like the FiTech.

I cant believe that it wouldn't take but a simple software change for the FiTech to be able to lock a tune in like the Holley. Anyone have a friend in the company and can get them to make the change? haha

Innovative makes a bung extender that dramatically protects the bung. I'm running a wideband and if it survives the season I'm going closed loop next year, but I'm keeping my wideband working in the other header to monitor things. If the FI sensor craps out I can use the other one to get home.
http://i622.photobucket.com/albums/t...2060A1E833.png

Mike do your research as I know you will however I spent a couple hours on the subject with dick from more power over the weekend on the subject. Guess that tells you what I had up my sleeve with new builds.

So what did you learn on the subject?

That was such a nebulous post that all I got out of it is that he likes dick. ;)

FiTech you can not run with out a 02 sensor, to me this is a deal breaker for marine.

I personally run Holley HP EFI on a GM ls twin turbo in a boat, the 02 sensor and self learned worked great to tune it in, actually was really easy, but after awhile it started reading lean(richened up the motor) I have since set my base tune back to what it first learned and turned self learn off. Seems to run just fine. This can not be done with FiTech.

My 02 sensor were pre-turbo and I have dry exhaust to the tips, and they still would get a tiny bit moisture.

I cant speak for FiTech cost, but Holley HP efi with the harness was $1500 and I use the 8" digtail dash which was another $750. Well worth the money. I think I have about 10-12 hrs into the tune and I bet half that was getting the idle quality right, so when it went in gear and lugged the motor down it wouldn't die, but wouldn't hunt when in neutral.

I'm not in any real hurry to do anything new. Seeing that the prices on these systems are beginning to become realistic I'm starting to consider them.

snake oil when comes to a boat setup, if you are getting ANY water near the 02 this is NOT going to help, we tried all kinds of stuff like this a while back, only cure was to move to a header tube which worked fine(how accurate no way to tell, but seemed fine) as far as the EFI really need to run with the 02 or at least do ALL tuning with one

Has anyone here had any good experience with running a closed loop system?

It is very difficult to run closed loop at idle. I run closed loop from 1800 rpm on up.

What's your experience with closed loop at idle. Looking to EFI a set of twin turbo motors and currently thinking closed loop.

I have 5 inch exhaust on my blower motors and you fight sucking back outside air at idle giving you false lean readings on the o2s. If your putting the o2s before the turbos the problem may not exist. I run the Holley Dominators systems with the new v4 software and it works great in closed loop above idle. Also the NTK o2 sensors are more durable than the bosch imo.

Agree that above idle closed loop is fine (I have mine open loop until 1500rpm - NA motor though). I have my idle well tuned 1500 and below. Also, if I do happen to kill an o2 I sort of have a limp home mode. Unlike ez though, I've had good luck with the innovative extender (I lost my fair share of o2's prior to using). I guess it probably comes down to the exhaust system, how much water your introducing into the stream, location, etc.

You can use it to tune the base tune but I would turn it off or atleast have the abilty to turn it off while on the boat, Problem is if the 02 sensor gets wet the heating element inside of it will crack it, thus screwing with the reading causing your engine to be to lean or rich, usally lean
This is also true special with marine with big open exhaust.
Wont matter if its twins or not still the same exhaust, I have twin turbo LS in my boat, 02 before the turbo's and I still wreck an 02 sensor. This is with dry exhaust 15" past the turbos.

What he said, I'm running ntk in mine at 250 a pop, you don't want togo screwing to many of these up. I love my EFI don't get me wrong way better then carb and even with out closed loop I can idle all day long and never load up the engine.

I've seen the plates under the turbos where they screw in the 02, what causes them to crash at that location. Should be little to no water there? Are they too close to exhaust for fuel condensation to burn off?

How much variation are you seeing in a/f reading?

I didn't have much time on the throttle and they were short experiments, but it richened up more than a half a point around sundown. it seems like it would lean out with the air more dense, so I'm calling it inconclusive until I have a chance to repeat it. Hopefully this weekend.

I wholeheartedly disagree. This works well specifically in more traditional manifold/riser/elbow combinations. I've done both with and without and this unit helps.

No but word around the campfire your ol lady sure does. Now that is NOT nebulous!

:party-smiley-020:

Well that's certainly no secret! :bananalove: Lol!

What would this world be like without humor. :drink: