EFI on a 351C 4V

ratio411 · Jan 28, 2007

If the 93 is an HO 302, it has the W/C FO already.
If it is not an HO, then you have problems.
Just use an HO computer and harness. It will be fine.

Hack · Jan 28, 2007

Use a CHI intake. They already have the injector bungs cast in and they are top notch quality. You could also use tongues in the ports to get the volumes down a little.

The HO 5.0 firing order is correct for the 351C, so you're good there (as already stated).

I don't think the 19lb injectors will be big enough, though! And you'll need a custom tune.

commonrail · Jan 28, 2007

My EFI

Attached is my intake pic. 80's Roush motorsport high rise vs a torker ( on right ). This is a height comparison, as the Roush is quite a bit higher with its air gap configuration. It also has raised ( and narrower ) runners. Welded in injector bungs, 42 lbs, 80mm, mass air, EPEC computer, 351W TFI dist ( modified shaft), etc.
Hood clearance was the only issue. My solution was to shorten the CHI power elbow, by 1", and reweld it. I'm pretty happy with the set up. Nevertheless, a true gearhead is never really done with a project right?
Recently removed the cast iron 4V heads, going to aluminums!!
My advice, if you are going to do this then do your homework, figure how much your budget ( time and money ) is, then Double it!

66bluepony · Jan 29, 2007

If you weld injector bungs into your intake, why can you not use a old (dry) carb for a throttle and plum in a iac valve in the back of the intake. Carb does not even have to be good.

ratio411 · Jan 29, 2007

66bluepony said:
If you weld injector bungs into your intake, why can you not use a old (dry) carb for a throttle and plum in a iac valve in the back of the intake. Carb does not even have to be good.

Well, you would also have to find a way to rig up a TPS.
If you use a carb, would you need an IAC?
That is the solenoid that allows air in to regulate idle, correct?
If you use a carb, it has air bleeds and slots, sometimes even holes in the throttle plates, to allow idle air into the engine.

ForceFed70 · Jan 29, 2007

ratio411 said:
Well, you would also have to find a way to rig up a TPS.
If you use a carb, would you need an IAC?
That is the solenoid that allows air in to regulate idle, correct?
If you use a carb, it has air bleeds and slots, sometimes even holes in the throttle plates, to allow idle air into the engine.

Yes, but you want to be able to control the amount of air than enters. When the engine is cold and 1st started up, it needs alot more air to idle.

Modifying a carb is a good idea, it's been done a few times and there are lots of writeups out there on how to do it. Here's a good one: http://www.mez.co.uk/ms2.html

Or, for $75 why not buy a brand new throttle body? http://www.auto-nomics.com/cgi-bin/showresults?a=detail&part=10850-002-D

b_deemer · Feb 1, 2007

I already have the original TB and mass air meter. Is there an advantage to converting a carb over using these? (Interesting challenge, though!)

What size injectors would you guys recommend (I agree that the 19# are likely too small)?

You guys are all giving great information! I really appreciate it!

bnickel · Feb 1, 2007

probably not much of an advantage to running one vs the other. i would suggest at least 24 lb/hr injectors at least possibly even 36 lb/hr units.

ratio411 · Feb 1, 2007

You can feed your engine specs to an engine analyzer program and most will give you a breakdown of fuel usage and/or an injector size needed.
My EA does...

CochinoFilipino · Feb 2, 2007

b_deemer said:
I already have the original TB and mass air meter. Is there an advantage to converting a carb over using these? (Interesting challenge, though!)

What size injectors would you guys recommend (I agree that the 19# are likely too small)?

You guys are all giving great information! I really appreciate it!

If everyone thinks the 19# are too small. Do you think the stock TB and MAF are big enough?

Maybe you want a larger aftermarket MAF calibrated for the larger injectors. You might want a larger TB too.

I wonder how much of the stock EFI system that you have on hand will actually be used in the end.

commonrail · Feb 3, 2007

I run 42 Lb injectors, 90mm throttle body & MAF. You can certainly run less injector, and less throttle. It depends on the cam, compression ratio, 4V vs 2V heads, ect. ect. I think 24's are O.K.
I run an EPEC with no IAC. starts and idles O.K., I may add a cold run dashpot, or solenoid.

EFI on a 351C 4V

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EFI on a 351C 4V

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