EFI - it runs! - Vintage Mustang Forums
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post #1 of 15 (permalink) Old 05-27-2019, 05:38 PM Thread Starter
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EFI - it runs!

1968 Mustang, 351W, Tremec TKO

For anyone considering EFI, I recommend the ProM EFI stuff. Multi port is awesome, and I went with the Coil near Plug setup. Installation is well documented, everything went together just like it was supposed to, and it fired right up.

Lumpy cam... idles considerably smoother than it did with the carb setup.

I haven’t cleaned up the wiring yet, so please don’t judge that part! 😬
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Huntingky, 68Hildago and 665spd like this.
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post #2 of 15 (permalink) Old 05-27-2019, 09:03 PM
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Congrats, man! Multiport is where it's at. Is the ignition and fuel managed by one system? What exact FI setup did you use?


It's just a little rust...

1966 secretary special originally 6cyl 3 spd coupe.(Goes to work twice a week)
5.0 SEFI complete from 1988 Mustang GT, world class T-5, 9 inch with 3.50 Trac Lok and Shelby style traction bars. Old Air A/C system.
Build thread:https://forums.vintage-mustang.com/b...5-0-resto.html

1969 Mach 1: 1000 miles (almost) to get it....in progress(slow)
https://forums.vintage-mustang.com/b...long-term.html
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post #3 of 15 (permalink) Old 05-27-2019, 09:44 PM
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Nice! Looks like a nice setup. I wish I could do the coil near plug thing with my setup. The Holley will easily support it, but my current engine packaging (intake) won't allow for it.

EFI is where its at.. once you get all the setup gremlins out of the way, it just runs.

-Shannon

1965 Mustang convertible

347 Stroker with Holley Dominator EFI
Street or Track coil-over suspension
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post #4 of 15 (permalink) Old 05-28-2019, 06:55 AM Thread Starter
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Quote:
Originally Posted by 665spd View Post
Congrats, man! Multiport is where it's at. Is the ignition and fuel managed by one system? What exact FI setup did you use?
351 Windsor Complete Mass Air Sequential Port EFI System - Ford Complete EFI Systems - Pro-M EFI Engine Management Systems

I used the complete ProM system, it manages fuel and ignition. I added the option to do coil near plug setup, but you don’t have to. You can use conventional distributor if you want.

I went with ProM because I think that mass flow systems are inherently better than the ones that use MAP and a lookup table.

Last edited by gspitale; 05-28-2019 at 06:58 AM. Reason: Add to post.
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post #5 of 15 (permalink) Old 05-28-2019, 06:56 AM Thread Starter
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Originally Posted by LastDeadLast View Post
Nice! Looks like a nice setup. I wish I could do the coil near plug thing with my setup. The Holley will easily support it, but my current engine packaging (intake) won't allow for it.

EFI is where its at.. once you get all the setup gremlins out of the way, it just runs.

-Shannon
You can remote mount the coils on a firewall if you want ... just have to get plug wires made.
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post #6 of 15 (permalink) Old 05-28-2019, 09:19 AM
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That is super cool!

-Chris

'68 Mustang
347ci that has a lot of neat stuff in it
T5 manual trans, alum driveshaft, 9" w/3.70 gears
Suspension parts from SoT, Global West, Maier Racing, and a few others. Works for me!
TCP manual rack (love it)
EPAS (Love this the most)
VWW V45 wheels (like these too)
SoT 13" brakes (stopping is good)
And I finally got a paint job!
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post #7 of 15 (permalink) Old 05-28-2019, 09:48 AM
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Nice job it looks really good.
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post #8 of 15 (permalink) Old 05-28-2019, 02:10 PM
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Congrats! I've had their system for about 10 years now on my supercharged 363. I have spent quite a few dollars on dyno/tuning to get it running right, but that's all in the past and running great now.

]

"A good friend will help you move. A great friend will help you move a dead body"

September 2017 Mustang Monthly cover car
1965 A-Code Fastback
Built, September 14, 1964 (San Jose)
Viper red, White/red interior
TCP R&P, G Bar rear 4 link/w shockwaves
Global West Upper/Lower/Strut Rods
Ride-Tech Air ride
4 wheel Cobra disc brakes/Hydroboost
363 Stroker/Paxton Supercharger
Mass-Flo EFI
Owned since 1983
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post #9 of 15 (permalink) Old 05-28-2019, 02:32 PM Thread Starter
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Originally Posted by DrStang View Post
Congrats! I've had their system for about 10 years now on my supercharged 363. I have spent quite a few dollars on dyno/tuning to get it running right, but that's all in the past and running great now.
Just curious - what were the major tuning themes and were they more to do with the forced induction or base tune?
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post #10 of 15 (permalink) Old 05-28-2019, 03:20 PM
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It ran very poorly out of the box. The forced induction component did offer some challenges for the tuner and for the overall schematic of the MAF meter and plumbing. We got it all figured out eventually. Switching engines from a 331 to a 363 required further tuning down the road but that's on me for changing a component of the system.

]

"A good friend will help you move. A great friend will help you move a dead body"

September 2017 Mustang Monthly cover car
1965 A-Code Fastback
Built, September 14, 1964 (San Jose)
Viper red, White/red interior
TCP R&P, G Bar rear 4 link/w shockwaves
Global West Upper/Lower/Strut Rods
Ride-Tech Air ride
4 wheel Cobra disc brakes/Hydroboost
363 Stroker/Paxton Supercharger
Mass-Flo EFI
Owned since 1983
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post #11 of 15 (permalink) Old 05-28-2019, 03:28 PM
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Looks beautiful albeit expensive. Two questions come to mind :
1. don't you want a lumpy idle and a carburator in a vintage car? I thought that was part of the experience ;-)
2. wouldn't it be easier cheaper and quicker to get a FI crate motor with stand alone harness? There are tons of options out there today...
I'm a tech junkie so I would go for a 4 cam and 6 speed, but tastes vary I get that....plenty of pushrod crate engine options as well...
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post #12 of 15 (permalink) Old 05-28-2019, 03:30 PM
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Super cool. Hoping I can find the time/resources for EFI down the road.

289
4 speed
Rally-Pac
Bench Seat
Power Steering
All-around discs
Aftermarket A/C

And not nearly enough time

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post #13 of 15 (permalink) Old 05-28-2019, 05:06 PM Thread Starter
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Quote:
Originally Posted by jacek View Post
Looks beautiful albeit expensive. Two questions come to mind :
1. don't you want a lumpy idle and a carburator in a vintage car? I thought that was part of the experience 😉
2. wouldn't it be easier cheaper and quicker to get a FI crate motor with stand alone harness? There are tons of options out there today...
I'm a tech junkie so I would go for a 4 cam and 6 speed, but tastes vary I get that....plenty of pushrod crate engine options as well...
To each our own I suppose, my opinion/answers:

1. I like the mix of old and new. Modern tech in an old car is very attractive to me - best of both worlds. Lumpy cam, big power, efficiency, tune capability, and looks of port EFI is an awesome combination.

2. If I were starting from scratch, I would’ve done a Coyote 5.0 with the FRPP EFI system. The car already had a brand new 351W in it with a super sweet custom built Kooks exhaust system, so I decided to stay with the tall deck pushrod engine. The upgrade path from here is very cost effective: to go to a 408 or 427 stroker means I only have to change the injectors.
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post #14 of 15 (permalink) Old 05-28-2019, 08:39 PM
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That explains it. Honestly, my 2001 Cobra I sold not too long ago was a bit of a disappointment in the engine department. The stock setup seemed to get the engine confused. The long intake runners are a setup for the low end torque but the engine architecture, 4 cams, short stroke, 4 valves per cylinder are a rev happy bunch. So the result, predictably, was not much low end torque and nothing above 5000rpm. After a while it didn't even want to go there. For comparison I have a Maserati 4200 with a similar, on paper, 4.2l 4 cam motor and it revs happily to no end. Both cross plane crank design except the Maserati has variable valve timing. I was thinking of swapping in the Boss 302 intake into the cobra as those runners are short and big for high RPM power.
When I called modular motorsports, my local modular engine builder they quoted me $8k to rebuild the motor properly. 8K! I could sell my cobra, buy a coyote powered car and would still be ahead money wise haha..

Last edited by jacek; 05-28-2019 at 08:41 PM.
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post #15 of 15 (permalink) Old 05-29-2019, 08:08 PM
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That setup looks so clean! I would be interested to see the performance difference between that and throttle body injection.

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