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1997 Ford F-250 XLT Heavy Duty 7.5L 4X4
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Discussion Starter · #1 ·
I need help with some problems with the build idea I'm tooling around with. I've got a 97 F250 with the stock speed density computer system. before I go spending time and money with mods to make the engine flow more air/fuel I need to know what to do with the EFI system so it will keep up with the increased airflow without just leaning it out. in a nutshell I need to know how to make power with a speed density system or how to swap over to a MAF system. All while keeping the electronically controlled E4OD working. the engine mods I would like to do are simple

Port the F3TE heads and stock EFI intake
Exhaust headers (no long tubes this is a 4x4 truck)
Mild camshaft
Maybe larger injectors if needed

While I've found some posts about this most are 10+ years with dead links and conflicting opinions. imo I dont know why this is so hard to find info, you'd think this kind of mild for fun build would be fairly common but idk. I need to get this truck moving down the road faster, I cant keep paying for a 10mpg no power engine.

Any info at all is greatly appreciated. I can tell from looking around here there is a wealth of knowledge in your guys' heads about these engines.

42 Posts

Pimpxshift. About $1600 all in with a single wideband o2 sensor. But fully controllable by you. Every aspect. Engine and trans. Uses the factory harness.

And if you want more you can add a few items and make it sequential efi, and individual coils as well. That gets pretty pricey though.

I'm buying mine in a few days. I'm on the same page as you. I tow a 28 ft 5th wheel, the stock 460 just isn't up to it. Next winter I'll be rebuilding the engine.

Premium Member
9,740 Posts
The OEM injectors and pumps are good with an AFPR to about near 400 hp as read on a STP engine dyno.

We've been building and posting about EFI working engines on this forum for almost a decade. Some builds are nearing 85K miles at last conversation.
Our specific parts combination which typically dyno's at 400 hp + or - and 520 ish Tq @ 3200 rpm works quite well with the OEM electronics at about 46 to 48 PSI.

26# accel injectors
Quantum fuel systems 255 lph pumps for na and 340 for boost applications gives you some room for increasing power or a larger 502" engine.

The above assumes headers, free flowing exhaust and a low restriction air cleaner element.

Here is a link to a very recent build we did for a client in Louisiana. We did another dyno'd with E7TE heads 2 days prior with almost identical results:

Feel free to utilize the link as a guide.

The OEM will trim closed loop fuel by up to 15 / 17% as needed with increased fuel pressure with out leaning open loop WOT. The key is to get the WOT A/F ratios from the 14+ to 1 range down to nearer 13 to 1.

A stand alone or tweecer tuned ECM will allow fine tuning yes and is necessary if the above parameters are exceeded.

Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
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