CFI performance

[85MercPark]

So what can be done to CFI to increase HP? Besides replacing it!!

[gadget73]

Changing the heads to a better design should help.

[Grand Marquis GT]

convert to...

No, just kidding

Exhaust, a bump in timing...

[85MercPark]

Exhaust, a bump in timing...

I have the timing set just below where it detonates already.
As soon as this exhaust rots out I will go duals, maybe some salt water will help!!! :banana:

I read KN is only good for high revs and can cause other problems anyways.

Would better plugs and a stronger coil do any good?

[85MercPark]

Changing the heads to a better design should help.

with the CFI computer would they really help?

[gadget73]

You should be able to change the heads without changing the computer to get some extra performance. Its not going to be a rocket but better flow=more power. Also like Tom said, good dual exhaust with headers will help too. Changing the rear to something like a 3.55 or a 3.73 also would be a good idea.

[marquisman]

how bout a carb swa.......sorry, never mind

[85crownHPP]

yeah theres not much you can do besides better heads and exhaust without getting into a lot.
You could possibly swap in a CFI mustang cam and computer too... tweak the fuel pressure regulator and even have to throttle bores machined larger... but CFI will never see real power do to its itty bitty internal fuel rail.

[85MercPark]

Thanks, I will see what the bank account lets me do first.

[Lincolnmania]

i would start with headers, h pipe, duals, and some gears.........3.55 is perfect for towing in drive

[Grand Marquis GT]

Nice avatar, ray!!

[85MercPark]

Nice avatar, ray!!

Thanks, I was gonna use


But didn't wanna be too over the top

[Grand Marquis GT]

[Ifixyawata]

I know of a guy who pulled the CFI body apart and removed the screens from the tops of the injectors and noticed that his car no longer had any off-idle hesitation. If you have the time to take the CFI body apart, it's worth a try.

[85MercPark]

I know of a guy who pulled the CFI body apart and removed the screens from the tops of the injectors and noticed that his car no longer had any off-idle hesitation. If you have the time to take the CFI body apart, it's worth a try.

I really don't notice any hesitation. I only have 34000 miles so that may be why.

[Ifixyawata]

Here's the guy's write-up on the process. He says you can also leave the screens all the way out, but if you want to be safe, add another in-line fuel filter, but you should be ok without it.

fuel injector cleaning
remove the cfi from intake
split the cfi in half via three phillups bolts from the bottom.
,, removed the lower injector retainer (be careful on the screw or you will be taping a new hole).

gently pull the injector out (keep track of your smaller orings).

take a pointed tip screw start this screw into the brass bushing just at the top of the injector until it started to grab real good.

grab the screw with pliers and pulled real hard and out pops the injector screen that is molded to the brass bushing.

spray the injector screen assy down with starting fluid or something.

Next, blast it with the air compressor.

insert the screen assy back into the top of the injectors,, turn the injector upside down and tap it on the workbench which will seat the brass bushing part back in its seat.

re-install the injectors and man does make a difference.

the screen assy is only about a half inch long and about 3/16 in diameter. Pretty fragile looking also. I re-shaped the screen on one becase it was a bit sucked together. I re-shaped it with a small ink pen insert.

[85MercPark]

don't sound like something I would want to try on my daily driver. Maybe if I get a spare cfi I can fool around with that

Thanks