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Tech Question
Ty Edagr, Wichita, KS, 90 dodge d150 318
Longtime reader, First time writer.
I have a 1990 D150 pickup with a 318 w O/D and EFI (computer is located by the battery, looks like the old Lean Burn boxes.)
The 318 is on its last legs and I don't have another right now, however, I do have a totally Rebuilt low compression 400 and trans .
My Question; Richard, is: could I use that EFI on the 400 or should I just get me another small block - maybe a 360?.
Thank you
P.S I am writing you this letter because you seem to have a wealth of knowledge When it comes to mopars.
Ty-
You have a bazillion choices here. Since this could fill a book, I'll condense it down and give you some things to think about.
The stock single-point throttle-body injection was a low-flow, low-po deal. But if you were happy with it, I'd say to just get a rebuilt 318 long block and be done with it. Iinstalling that small throttle body on a 400 would really choke it off. Plus, you'd be quite lean - you'd need to either find a larger injector (more flow) or jack up the fuel pressure. (remember, unlike a carb, EFI is not a "demand" device - if you increase the airflow, vbia displacement increase, cam, whatever - you need to widen the pulse width or make other fuel-delivery changes.) You'd need to monitor O2 to know when it was tuned correctly. This is similar to what the rice boys do with the Hondas, etc. However, for my money, if you're gonna go with the 400, I'd just bolt a spread-bore 4-Bbl on it.
The cool-guy way to upgrade would be a 92-up 318 or 93-up 360 (SMPI "Magnum" engine) installation. This is a fairly easy swap in your truck since you can use the wiring from a '92-93 SMPI pickup pretty much unmodified. This swap (either displacement) is a huge improvement in both torque and fuel economy.
Rick
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