QuestionSteve,
If i keep my EFI system with all the engine modifications ie heads, pistons,cam, larger injectors will the engine run correctly without some sort of EFI computer adjustment?
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Thanks Steve I appreciate all your help. I definitely want to go back to a carb set up. I have a manual trans. Is there some document I can read about this conversion? If not can I get you to give me more details on the odds and ends. I understand the intake, carb ,dist and module. Should I drop the fuel tank and install a low pressure pump? Do they make one? My blocks at the machine shop can they change it to accept a eng fuel pump? What's a tach adapter? Where would I mount a fuel regulator. Isn't their one on my EFI set up now. What about the wiring for the computer? Will the car start with out that hooked up?
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What would I have to do to change my 88 gt back to carb from EFI?
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I just bought an 88 gt convertible. I would Like to make at least 500hp at the rear wheels. I have torn down the engine the block is ready to go to the shop. The only thing I bought is a set of AFR 185 heads with the heavy duty springs non emmission legal with 58cc chamber. Want it to run on pump gas not a daily driver. What do you recommend. I'm on somewhat of a budget no blowers.
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Curt-
Making 500rwhp with AFR185s and no power adder is probably pushing the limits of realistic. Could it be done? Yes...but it'd be no fun at all to drive on the street. You'd need a HUGE cam, equally huge exhaust (probably 1 3/4" headers into 3" exhaust), a pretty racy intake (this is not a time to use something like Edelbrock...you want something like Probe Industries' Pro Spyder), and definitely a stroker kit. Hope this helps.
Steve
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Curt-
It's a bit of a pain, but in the grand scheme of things it's not too bad. You'll obviously need the carb and a new intake, as well as a new fuel pump (low pressure), distributor, ignition control module (like a Crane or MSD box) and a few other odds and ends like an MSD tach adapter, adjustable fuel pressure regulator, and things of that sort. The fuelp ump isn't an absolute must, but if you keep the stock pump and use a regulator to knock the pressure down but it tends to heat up the fuel because it's conatantly circulating it back and forth. If the car is an automatic you'll need to find an adapter to fit the AOD since AODs don't use traditional kickdown levers and they don't like carbs. As far as I know they're only available for Holley carbs. You can make other carbs work but I would be able to tell you how...I've always just done it by accident. Hope this helps.
Steve
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Curt-
I'm sure there's some tech-type articles on the web. I'd just hit up google and search for something like "Mustang carb EFI conversion". There was also a decent article a couple months ago in one of the bigger Mustang mags...either Muscle Mustangs And Fast Fords or 5.0 And Super Fords. To the best of my knowledge no one makes a low pressure in-tank pump. I've never seen one that wasn't in-line. The block doesn't have much to do with an engine driven pump. It's more about the timing cover and you would need to install a fuel pump eccentric on the end of the cam. This just looks like a little cup and it is what drives the actual pump. I don't know if an '88 block has provisions for an engine driven fuel pump, but if not then it's not really something the can machine for. You're probably better off with an electric one anyway. A tach adapter is something you'll usually need for aftermarket ignitions. Without getting way too much into why, I'll just say that most aftermarket systems (Crane, MSD, etc.) use multiple sparks every time a cylinder fires. Your stock tach can't understand this and will count every spark signal as 1 rpm so you could be looking at a tach that reads erratically or 2 or 3 times the rpm it's actually running. Where you mount the regulator is up to you...it's not hard to find a mounting place so long as it's relatively close to a vacuum source. Yes, your car does have a regulator from the factory, but it's set up for an EFI system and it's not adjustable. Most modern electric fuel pumps are pretty well regulated internally, but having an adjustable regulator is a great tuning aid. Hope this helps.
Steve
AnswerCurt-
If your car has a speed density type EFI system, the modifications won't work without a mass air upgrade. You can buy one from Ford Racing for a reasonable price. You can put one together yourself, but I don't recommend it as people almost always forget at least 1 or 2 important things. The installation is a little involved, but not terribly hard if you've got a decent tool set and some patience. Hope this helps.
Steve
