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Hello all.. I'm disappointed after a 4 year battle with myfitech system I'm about to give up. The problem I have a weiand 4bbl intake and my only carb on hand is my old 2150 2bbl. Can I make this work or am I setting myself up for more trouble? My engine is a fresh stock 400. I guess I need advise for the best smallish carb or someone with an idea to fix the corrupt tach signal my fitech sees even after new distributor and coil and icm.
thanks
Brent
My FiTech is also on the shelf. I personally like the Summit 600cfm carb with annular boosters. I ran that while waiting for the Holley Sniper to arrive. Its a hard to beat carb and there is plenty of people here using them.
I do not make recommendations from guessing.......... I make if from hard learned lessons. I had the exact same adapter it would not work with a 2150 without using a Ford OEM port/vacuum plate. In the end the 2bbl made the 302 gut less, compared to the 4bbl. https://www.ford-trucks.com/forums/1...l#post17897779
Not sure how true this is but fuel injected carbs need a single plane manifold to work correctly.
This would be more the case where you have port injection.
Throttle body injection has some of the same issues as a carb with respect to keeping the fuel in suspension after it leaves the throttle body.
Single or dual plane would be dictated by the other engine factors, or by money--I wouldn't spend money on a manifold until I worked at dialing in the carb or EFI on the manifold I already had on the engine.
2bbl on a 400 using a 2bbl adapter makes about as much sense as flushing $50 down the toilet IMO.
( Insert favorite 4bbl carb brand here ) will do just fine on a 400. A finely tuned quadrajet with it's correct adapter if needed would be a great carburator and could rival a TBI system. Some people hate them, but a Qjet is a great carb.
I'm an EFI person, and I'd install a better port EFI system
2bbl on a 400 using a 2bbl adapter makes about as much sense as flushing $50 down the toilet IMO.
( Insert favorite 4bbl carb brand here ) will do just fine on a 400. A finely tuned quadrajet with it's correct adapter if needed would be a great carburator and could rival a TBI system. Some people hate them, but a Qjet is a great carb.
He has the 2bbl in hand. Adapter is less than $50. It's a stock 400, it will be fine with a 2bbl. It sure doesn't need a "Quadrabog" with those garbage can sized secondaries.
This is my second fitech unit. First one the ecm died out of warranty. This one is only 6months old and ran great untl it decided to disslike my tach signal . I sourced a new motorcraft icm.and coil. Redid all wiring tried to shield the wiring etc.
I'm not totally new to the game I am a mechanic by trade..but I will admit my carb skills are really lacking now lol. I am waiting to see if I can return the fitech for exchange or refund . And adapt my 2150 in the interim. It is my daily so this really sucks!
My FiTech is also on the shelf. I personally like the Summit 600cfm carb with annular boosters. I ran that while waiting for the Holley Sniper to arrive. Its a hard to beat carb and there is plenty of people here using them.
Are you running the sniper system now? Are you happy with it?
Not sure how true this is but fuel injected carbs need a single plane manifold to work correctly.
Originally Posted by 85e150
This would be more the case where you have port injection.
Throttle body injection has some of the same issues as a carb with respect to keeping the fuel in suspension after it leaves the throttle body.
Single or dual plane would be dictated by the other engine factors...
It's all true. Or, in the immortal words of the famous Saturday Night Live skit... "It's a floor wax, AND a dessert topping!"
It's been well documented in many dyno tests that the typical throttle body injection systems from MSD, FiTech and Holley can benefit from at least an open plenum. If not strictly a single plane manifold, the open plenum helps the signal interpretation of the sensors. Or at least that's what they surmise.
So with a typical dual-plane like a Performer it is recommended to grind down the plenum divider slightly and use an open gasket, or just add an open spacer on top so the signals are taken as a combination of the left and right bank, rather than just one side.
I've never done it (yet) but have been reading about it since the beginning of the more recent introduction of the new-ish TBI systems. Did not come up with the old GM TBI setups from Turbo-City and others, and if I remember those manifolds used individual separated holes rather than any common plenum. But the new crop starting I think with the MSD Atomic and Edelbrock E-Street (no longer available) and then the FiTech seem to benefit from the open plenum.
Are you running the sniper system now? Are you happy with it?
I am on my third engine now with a Sniper, I had a issue with one TB that had a leaking injector, Holley sent me a replacement overnight and it has been fine. The ability to tune is leaps and bounds above the Fitch and is much more open source.
Are you running the sniper system now? Are you happy with it?
I've got a Sniper kit and it's been pretty solid for me. Been on the rig over a year but not too many miles on it. I'm quite happy with the whole setup - Hyperspark plus Sniper is fantastic.
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