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I have a 92 f150 4.9l and I've seen a couple online that have turbo. I just wanted to know how the stock computer would handle 5lbs of boost from either a turbo or supercharger.
I have a 92 f150 4.9l and I've seen a couple online that have turbo. I just wanted to know how the stock computer would handle 5lbs of boost from either a turbo or supercharger.
My '96 had Mass Air; do not know when 4.9 got that, instead of Speed Density.
To answer your question, a Mass Air operating computer will handle forced induction just fine, but not Speed Density.
If it's the same as with the V8s, then only 95-96 will have the MAF system. And even then, some 95s won't.
Right, same story with the 4.9. Might be that it's more definitively "1996 only" with the 4.9 - not sure.
So to answer the question, with a '92, not well at all. Frankly, that would be my answer with a '96 as well, as you might very well run out of fuel before you got to 5 lbs. Perhaps you'd be okay under 5 lbs, but I wouldn't try it unless I had another engine at the ready.
But again, with a stock speed density setup, all bets are off.
Chips on these trucks are useless. You need to switch to a Mustang ECU and use a Tweecer system if you want to modify a Ford MAP ECU for your application; you could also switch to a Ford MAF ECU to accomplish a similar goal.
So your saying I can use the same maf ecu thats on a v8 mustang and tune it to just run six cylinders?
Sorry... mixed up a forum post and forgot you were running the 300 i6. No, a Mustang ECU won't work. Best bet is to find a MAF 300 i6 or find an ECU for the 300 that is compatible with the Tweecer tuner.
You might get away with a stock set-up and maybe 5 lbs. of boost. I tried 6lbs with a 302 and speed density and a fuel management unit, everything else was stock, it idled bad, and the power was real peaky. Speed density can only go so far and can't really measure the extra air you are pushing in. I tried it knowing I had another build on the way.
You would need a tune/tuner for more and there are very few that would tune a 6 cylinder with speed density. It would be worth a call to Mike Glover, owner of Tweecer, to see if he has a "Strategy" available which is used to tune the inline 6 with Speed Density or MAF. MAF being the better way to go.
Then you wouldn't be able to run much boost without upgraded fuel delivery - higher volume pump and larger injectors. You'd probably also want a better cam, intake, and exhaust to get the most out of the boost.
A computer made to run a V-6 having MAF could be adapted to the inline engine without a hair-pulling hassle, if the installer knew WTH was going on......
Bigger the V-6 the better, a 4.0 Ford, like Explorer would likely do, but sufficient fuel would have to be made available.......
Easiest would be to get the EFI set-up off a '96 F-150 with 4.9L, use it on your existing engine, then huff away!
thanks for the info guys. Now I have one last question. A turbo 4.9 would be great how would it compare to a 351 EFI especially in terms for gas since this would be a daily driver with occasional hwy trips about 60 miles and occasional boat towing?