How many mods can you get away with using the speed density on a '94 with a 5.0? Thinking about a crate motor TFS heads & a X303

 

You're probably pushing the envelope too far with speed density. See my post on this at https://www.f150online.com/f150board...ML/000096.html

 

I have heard that an increase of 10% will not affect the speed density PCM. The mods that you listed will probably go beyond that.

 

Flip...From Www.pickuptruck.com?

 

Check this out.

http://www.fordvschevy.com/ubb/Forum18/HTML/000268.html




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1999 XLT SC, bright red, 4.2l, 5 speed, MAAP stainless nerfs, Prime Designs bug deflector, Astro Euro-Lid II, Mobil 1.

 

I always wanted to run a larger lobe cam in my F-150, but was told by several mechanics that SD won't allow it. And a 600 switch to MA isn't worth it. I can get a new intake and carb and switch from EFi cheaper.

 

Put a Ford MotorSports Mass Air conversion kit it.
Part # M-9000-T50 manual trans
M-9000-T51 Auto Trans

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1999 F150 4x4 4.6V8 regcab/shortbed
Oxford White with Wedgewood Blue two tone, with Blue Captains chairs
Bassani Cat Back, Superchip,Modified intake with modified K&N filter.

 

Flip from www.ford-trucks.com. I don't remember going to Pickuptruck.com but maybe I did. I just went tho the site and nope it's not me.

[This message has been edited by Flip (edited 01-30-2000).]

 

Yup, that X303 will kill you if you remain with Speed Density. Anything that radically changes vacuum(X-303 for example) at idle or at cruise will result in bad drivablity and possible lean conditions. Minor cam changes are no problem, talk to a reputable cam grinder(Crane,Comp Cams) and they can grind you a SD friendly cam. Usually heads are not a problem and superchargers aren't a problem, pretty much just cams.



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Curt
93 Lightning #4232