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-   -   1989 351W EFI tweak (https://www.fordmuscleforums.com/late-model-efi-techboard/474374-1989-351w-efi-tweak.html)

mengbar 04-20-2008 08:12 AM

1989 351W EFI tweak
 
I have a 351W EFI in my 89 Bronco that gave out. I bought a new ford remanufactured long block to install. I pulled the C6 and had it rebuilt with a good shift kit. I have been debating doing some engine tweaks before I reinstall.
I'm going to convert to MAF (keeping my options open), so a manual mustang ECU is being sought out. I was debating pulling the stock cam and installing the Ford mustang HO hydraulic roller cam to help the 351W have good throttle response maintaining the stock EFI. I don't race or do the off-roading in my Bronco but I do a lot of daily driving. I seldom tow. Just enjoy a good driver. I don't believe a improved flow heads will buy me a lot of bang for my buck given my low desire to hotrod. I already have headers and dual exhaust. I do want to keep my EFI, I love the relaibility. I'll be installing a mellings oil pump and a cloyes true roller timing set. I plan to stay with my 19# injectors and have the TFI distributor rebuilt and curved.
Anyone out there have any suggestions or ideas.

jrosengarth 04-21-2008 02:33 PM

Re: 1989 351W EFI tweak
 
I assume since you say the Bronco is now EFI and that you want to convert to MAF, that it is currently speed density? If so, take my advice and LEAVE IT THAT WAY! You will gain no advantage by converting to MAF and it will only cost you a bunch of time and money. I know...I did the EXACT same conversion. You can tune speed density same as MAF, and you will get better throttle response to boot. MAF is capable of better gas mileage, and can easily adapt to engine modifications, that is the only advantage. Since you say you are leaving it pretty much stock, that's not an issue. Also, the 19lb injectors seem small to me for that engine. Use the formula mentioned on the Injector Upgrade article to make sure.

Fuel Injector Size = (Crank Horsepower x 0.55) / (# of cylinders x 0.85)

-J

ZephyrZ7 04-24-2008 06:36 PM

Re: 1989 351W EFI tweak
 
Quote:

Originally Posted by jrosengarth (Post 1407493)
You will gain no advantage by converting to MAF and it will only cost you a bunch of time and money.

MAF is capable of better gas mileage, and can easily adapt to engine modifications, that is the only advantage.

-J


I dont mean to nitpick but those statements contradict themselves don't they? Better mileage and adaptability seem like great things to gain to me.

jrosengarth 04-28-2008 06:38 AM

Re: 1989 351W EFI tweak
 
Quote:

Originally Posted by ZephyrZ7 (Post 1408503)
I dont mean to nitpick but those statements contradict themselves don't they? Better mileage and adaptability seem like great things to gain to me.

Hey maybe I'd better run for office!! :D

Those small benefits, to me, are no advantage at all, that's what I was trying to get at. 2-3 mpg better at best and unless you plan on switching out heads/intakes/plenums on a regular basis what's the point? I've done a MAF conversion, and while it was a fun project, it was also a complete PITA. Of course I changed a whole bunch of other stuff too which maybe just made it feel worse than it was.
-J

ZephyrZ7 04-30-2008 05:47 PM

Re: 1989 351W EFI tweak
 
I thought we were supposed to be making things tougher? :o

mengbar 05-07-2008 06:46 PM

Re: 1989 351W EFI tweak
 
Alas....the debate continues. I appreciate all of the feedback. Part of glory of posting questions is the wide degree of opinions. They are all good input.

I've been reading everything I can find concerning mild to wild builds on the 351W EFI. I dig the engine, always have. I like it even more now with the fuel injection. I like carbs...but just get tired of the seasonal tuning and occasional burps and hung linkage and dah da dah (the list goes on and on).

The speed density version of the ford EFI does not really bother me so much but I read so much that implies that it can get lost if you try to improve throttle response. I like good throttle response and would like to tap a little fuel economy now that my big ride habits result in my getting raped on a regular bases buying fuel. How much fuel economy....well, a goal would be 18 mpg (not likely). I'm a real big guy (350) and just hate the thought of squeezing into a midsize with my legs around my neck and steering wheel rubbing my thighs. The ole Broncos are comfortable and a price has to be paid for that.

If I could find a good combo (roller cam, computer, and a good port job on my factory heads, maybe GT40's) that would keep me daily driving the Bronc with the ole speed density set up, I'd do it. I just have to recon the parts and play in the garage for a bit.

I currently drive a 78 Bronco daily now (400M/C6, headers, duals, eldelbrock performer w/holley 4160). She needs a rest and I want to do a bodyoff on her. The 78 is extremely rust free and to good to waste by not giving her a good facelift. Believe it or not boys, I nail a consistent 14-mpg on 89 octane. Not to shabby for a 400M warhorse TIPPING THE SCALES AT 6200#.


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