Has anyone been successful with converting to self tuning EFI with a long duration (250 +/- @ .050) cam??

We have a FAST 2.0 on 1 car, it idles right at 10", but we think the EFI isn't always happy. This a 242/244 @ .050 cam, 110 LSA

The next project's cam is 244/252 @ .050, (110 LSA) and I'm having my doubts about my first choice in the FAST EZ EFI due the 10" vacuum needed.

Some kits declare 8-10" required...

Anyone have any experiences/advice to share?

Thanks!

I recommend an EFI system which you can tune with a laptop. That way if the stock settings don't work you can either hook up your own laptop to the ECU or take it to a tuner.

I just spent some time this morning helping a local guy who has a Holley Terminator system. His idle speed was hanging up and there is no way to fix that from the handheld device. I was able to plug my laptop into his system and adjust the IAC hold percentage and that fixed the problem.

Holley Sniper has laptop access but I don't think the FiTech does. I don't think MSD has laptop access either. You'll have to check on FAST, might depend on which setup you buy.

I have the FAST XFI SPORTSMAN, love it, it’s only laptop tunable but very easy to use, you can sit at the coffee table and build a tune or modify the existing, plug it in, two seconds later your new tune is in and running, or have a street tune and a track tune, simply drive to the race track, load the more fuel and timing tune for racing and go race, put the street tune back in it to go home on a less aggressive tune about town. if you have a low vacuum engine due to a cam you pretty much almost have to use a laptop tunable system.

Big cams are tough, the IAC settings get tricky with the gain and amount right. I had a .738 lift cam with 283* duration at .050 in a 484 Hemi.

It was a pain to get the engine to idle well and transition well without surging. In gear vs. out of gear, & cruise vs quick stop. Essentially I used the IAC settings as low as possible without adding fuel as rpm varied a little. Need to set the throttle blades to get some air without the IAC. I messed with this when the timing curve wouldn't keep it from surging. My throttle blades were big and made this very touchy...

So FAST 2.0 or Holley Dominator, maybe the XFI sportsman...Yes you want a laptop tuneable one.

https://www.youtube.com/watch?v=9tHA9t2U8-Y


https://www.youtube.com/watch?v=-AXRHXSV5Jc

I run a SB and the cam is a fair bit bigger
than your specs.. its a Holley HP unit and
I use the labtop to tune.. I had a lot harder
time tuning with a big solid roller

I have a FITech on my 493 with a 260/266 @ 050 cam.

It doesn't have an option to go open loop or Alpha/N in idle, but with some trickery I got it to clean up at idle. FITech does have software to tune via laptop, I will say the software sucks, and they explicitly do not support any tuning you want to do on your own, and they don't document things very well either.

Next car will get proper MPI with a Holley ECU

Mine is stone age by comparison but getting a consistent idle with a 509 248@.050 in closed loop was impossible. It's an old Commander 950 system but it had the option of switching between alpha numeric and closed loop. Once it got over 1800 RPM on A/N, it was happy to run on the map closed loop.

Kevin

Tough love...

If you don’t want to tune yourself, put a smaller cam in. There is no 100% perfect self tuning system for larger cam engines. Maybe someday, but not now.
Holley’s hp/ dominator systems impress me, but even on a stock engine, some manual tuning with a laptop is needed for a perfected tune/ driveability. Not to say that a Holley on a stock engine doesn’t run extremely nice, just not perfect.

The fast system should be perfectly capable on any engine/ cam combo with some laptop attention.

Good stuff, guys. I appreciate this. The FAST 2.0 was my first exposure to this EFI world, so I'm "self learning" too.

Holley HP system if Multi-port, or Holley Terminator if you are looking for a TBI setup(Terminator uses the HP ECU).

The new Super Sniper should be a good system too and less expensive than a multiport setup. The Holley Terminator is a good system that is fairly easy to install. But you'll need a laptop, an ECU cable and the software to really dial in a performance engine.

The local guy I've been helping out has an LS crate engine with a fairly mild cam and his Terminator system has required a few trips to a tuner. If he had a radical cam in there then he would be paying a lot to get it tuned.

Turn the self learning off after you dial in the fuel map.

I use XFI 2.0 on both my cars. .800 lift with 285 at.050 and the other is about .650 lift but I forget the at .050.

Where u located

I might have to pick your brain from time to time FastmOp, I’ve got the XFI 2.0 Sportsman on my stick 340 but am about to swap to a cranky solid roller W2 408. I’m still very new at EFI tuning

Greg

I installed a Holley Terminator EFI on a 318/390 stroker. It had a hydraulic flat tappet cam with 239º/246º @ .050. The Terminator had no issue with the cam duration. After driving it for a while, the engine idled great, and throttle response was razor sharp.

i just put the FiTech Go8 1200 on the Charger just to see if it would run on an engine with big cam. The Charger has the 500" stroked 400, 12.4:1 compression, Hughes ported Victor MW heads, Comp HXL lobe solid roller 272/278 @ 0.050, 110 lsa, 0.726"0.726" lift. About 4-5" vacuum at idle.
I just tried the swap from carb to TBI EFI about 3-weeks ago using a temporary fuel system. Initial startup and idle looked like it will work, so I got the in-tank retro-fit EFI pump and adapted my old fuel system to the new system. I also got the timing control to work with a lean-burn distributor. I think one of the biggest factors with these self-learning systems is no exhaust leaks and full exhaust system so fresh air can not mess up the wide band O2 readings?
I have only drove the car about 30-miles, but it seemed to self-learn when driving, and does run good, but still working on the idle system.
Right now I have idle set a bit high at 1,300 RPM, and made a few adjustments to the idle mixture, idle ignition advance, and increased the idle trim rates a bit. I need to make a few adjustments for return to idle as it takes a bit of time for the idle to come back down, but it is not that bad.
The FiTech "power adder" versions come with the laptop software where you can tune with a laptop. I think the non-power adder versions can do this also, but you have to download the software from FiTech. I think they want to obscure the actual EFI control with simplified user software and instructions.

Holley has a "Super Sniper" TBI that looks really nice, has some additional features, and is priced the same as the FiTech. Their software is more traditional EFI menus and they have better instruction manuals and videos. I haven't used one, but have heard good things about the regular Sniper TBI system.