Packard Forum Index » Modification Discussion

Congrats on the EFI. It looks pretty slick. That's an idea I have had, but I have no 12v cars as yet.


Yet . . . .

my EFI tank came for my Dart last week and in the box was the universal sending unit. it is Ohmed for Mopar. 75-10ohm. but that just means i need a gauge for that setup. no worries there. I will get an aftermarket gauge.

I tested my original sending unit and it was fine...so either my "runtz" blew or the gauge is dead because i left the key on and it got too much voltage too long. either way....it wasn't accurate anyways. so i'll mount a new one under the dash.

if anyone was wondering....the newer senders will fit the top of the tank. same bolt pattern. i just drilled a hole in it and made my own pickup tube. i would have made my own return line, but not enough room and honestly...it BARELY fits back in the tank as it is in the pic. but it works.

also....getting that return line fitting on and tight was a PITA!!! damn fat, grown man hands!!!

i temporarily setup the wiring for the efi so i could test it and well....we have our first 1937 Packard 120 282 running EFI.

the car has NEVER ran this well....EVER....again.....EVER and the coolant temps were much much better. probably because its running at the right A/F level now. I was also better able to adjust idle rpm and several other parameters.

obviously it is not setup fully and it has learning to do...but it runs and runs VERY VERY well.

the intake adaptor i made...was cold to the touch...and i mean literally cold. there was sweat on the aluminum riser. vapor lock will NOT be an issue now. and just from it running in the garage...i can tell its making better power too. can't wait to drive it.

here is a video of it running. me blipping the throttle like that was to show it does not bog like the carb did. it literally just goes. the clicking noise you hear is not the lifters...its the injectors in the fuel rail. you can't hear it when the breather is on, nor in the driver's seat.

youtu.be/9a4EdrH1Crg

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Congrats on getting the efi going! Can't wait to hear how it drives.

Got it all squared away. Today was the maiden voyage of the first efi 37 Packard. All I can say is O….M….G….. this car has NEVER had this kinda power or pickup and go!!! My butt dyno says I gained 20hp.

Took the family for a ride and even they were blown away. It never bucked… never stalled… it just ran…

I regret nothing.. goodbye carb. Not even a need for a choke now. It just starts.

Only thing I need to figure out… and it’s not that big of a deal…. But the gas pedal only has enough travel to open the throttle body 70%. But honestly… it’s plenty of power as is…. And the wife clocked me at 75mph with the gps. Hit 4250 rpm. Temps… 192.

Mic drop.

Oh, my....


Now I want one, despite my carb working perfectly...

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My carb was pretty decent.. just would buck if giving it quick gas sometimes… and when I went to Las Vegas and tried to drive the strip… it was not jetted right and didn’t want to run. The efi is just pure linear power. Smooth…. No gasp when you give it quick pedal and just more power honestly…. I have more passing power in 3rd as well. It’s night and day.

Nothing against carbs… they got us to where we are now… but this efi is just the bees knees.

4250 RPM? Wow, that must be flyin'!
What kind of AFR numbers are you seeing at some normal operating points. Idle, cruise, wot?

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I’ve hit 85 in her before…the 70% throttle is holding me back honestly…the efi just has a larger swing to go full open then the carb and thus the gas pedal as well….But really no need to go that fast in this type of car. It’s not a hot rod…3500rpm is 65mph. Plenty. If this was a coupe and I threw in the 4.23 gears I got sitting in the loft…. 100mph easy.

It always tries for 13.5 afr…. But it will go up or down if I floor it or let off when cruising. I see between 12 and 15 depending on what I’m doing…. But honestly at cruise it’s 13-13.5 on the dot. The fuel trim tries hard for 13.5. Idle stays at 700 rpm (or what I set it to in the software) and 13.5 afr. I’ll make some notes next time… I was just so giddy driving tonight I didn’t record it.

Should be a lot less fouling of plugs too. Not been an issue for me… but keeping that median afr helps.

Also to note… the efi is still learning and there are so many things I can adjust in the hand held unit. But initial run has been so spot on…. How can it get better?

I did reset the tripometer… so we will see what gas mileage I get… which will take forever cause I don’t drive it often.

I am still impressed that you are revving that thing to 4k rpm! I know these engines are rated at max hp around 3600, so 4k does seem reasonable every once in a while, but I rarely go over 2500rpm. cool that you are driving it hard.
Sounds like the AFR is already quite good. max power should be around 12.5, so if you see that when stepping on it, that is great. And cruising at light throttle can be around 15, which it sounds like you already have. In the "Serviceman's Training Booklet Engine Daignostic and Tune Up" from July 1947 they actually write about target AFRs. It is good reading. The 13.5 is a very good middle number. Engine tuning with a wideband Oxygen sensor is a great way to get it running smooth, clean and fast.

Yeah I didn’t even know what rpm this thing was doing before because I had no tach. I can actually go higher…. I’ll get a pic next time for proof. But it does scream for sure…especially with the 4.56 gears. But it takes every bit of it. Guess I rebuilt it pretty damn good.

Also IIRC… I can set the throttle plates open a bit and set that as 0 on the tps… it will adjust idle…. And I’ll gain more tps range beyond 70%. All in good time…lots of settings I can play with.

Gas gauge should be here today… will be nice to have an accurate reading of that for once as well.