Ford Racing "E 303" cam w/ SD EEC?

wayneF250 · #1 (**permalink**) 10-10-2007, 10:42 PM

Does anybody run a E 303 cam, w/ a SD computer? How much Hell was it to tune? also how much HP can a MAF computer can stand, or better yet , when does the maf sensor start chokin down horsepower? The reason I ask, is I have a 94 f 250, w/ a "stroked" 408 ci, E 303 cam, 24 lb injectors, Performer RPM Edelbrock heads, Edelbrock 5.8 "truck" intake #3881, Motorvation Module and i'm on my 3rd chip, The tuner said" I will burn as many chips it will take to make it work". The only problem I have is . IT WONT IDLE , other than that its ok, I'm thinkin bout doin the SD to MAF swap, or goin to a aftermarket SD computer that is guarenteed to work, because then I can tune it myself, tThe motor is 400 hp, 400 torque will the maf choke any HP?

dragogt · #2 (**permalink**) 10-10-2007, 11:10 PM

a maf swap or the aft mrkt kit, will make it a lot easer to tune, and will also give you more power. A SD computer needs a LSA of 114* one of the other guys can get a lot more specific then I can

Blurry94 · #3 (**permalink**) 10-11-2007, 12:06 AM

It wont idle because it will not produce enough vacuum with that cam, at idle. Only easy remedy is to do a mass air swap or change the cam. I don't know what your tuner has tried thus far, but making changes to the injector slope, pulse and breakpoint could possibly get it to idle. However, you'll find that fueling will be all over the place at tip-in/out, and gas mileage will suffer.

In many cases the MAF is larger than the throttle body so it isn't an issue. However, on a N/A combo, the larger the inlet side, the better.

Conanski · #4 (**permalink**) 10-11-2007, 09:57 AM

Quote:

Originally Posted by wayneF250

I have a 94 f 250, w/ a "stroked" 408 ci, E 303 cam, 24 lb injectors, Performer RPM Edelbrock heads, Edelbrock 5.8 "truck" intake #3881, Motorvation Module and i'm on my 3rd chip. The motor is 400 hp, 400 torque will the maf choke any HP?

No a 70mm or larger mass air meter will not restrict the motor, but that intake certainly will.

wayneF250 · #5 (**permalink**) 10-11-2007, 02:39 PM

Hey thanks ya'll, thats kinda what I fugrued about the MAF , There seems to be people on both sides saying one is better SD to MAF, but if u think about it knowing how much air is coming in, seems better that a look up table when a motor is at a ceritn RPM and going by a programmed figure...........think i'm goin to MAF, I'll be sure to tell u the result !

wayneF250 · #6 (**permalink**) 10-11-2007, 02:42 PM

another question, will there be a throttle response difference w/ MAF, and will I tell a difference w/ the SFI to the Bank firing injectors?

dragogt · #7 (**permalink**) 10-11-2007, 03:07 PM

throttle response should quicker (I think)

Conanski · #8 (**permalink**) 10-11-2007, 03:31 PM

The MAF system can better adjust to the motor realtime, and it handles modifications more smoothly. It has been my experience that SEFI motors have better throttle response, but I don't know exactly what is responsible for that, could be the sequential injection, could be the fuel/spark curves, maybe it's a combination of both.

dragogt · #9 (**permalink**) 10-11-2007, 05:34 PM

that's what I was thinking I'm just not a FI buff, so was not for sure

Blurry94 · #10 (**permalink**) 10-12-2007, 12:04 AM

The quicker throttle response is what I noticed first when I changed mine over. I was able to tune the SD system well enough to drive around, but I never got the fueling as accurate at the mass air combo I have now. I also had to store 2-3 programs with my speed density combo; for warmer and cooler temps.

wayneF250 · #11 (**permalink**) 10-13-2007, 07:18 AM

One more question, Did y'all see ana improvement in MPG w/ the MAF swap???

Blurry94 · #12 (**permalink**) 10-13-2007, 11:55 PM

Some have noted roughly 2mph improvement after a mass air swap. I haven't been able to see if there is any improvement because I can't keep my foot out of the throttle.

benshere · #13 (**permalink**) 10-23-2007, 09:24 PM

Was I lookin through my glass eye again or did you say MAF on a Speed Density system eec?

wayneF250 · #14 (**permalink**) 10-27-2007, 06:34 AM

no, MAF or SD EEC, by the way , I'm doin my conversion to MAF in TWO weeks.........

benshere · #15 (**permalink**) 10-27-2007, 10:24 AM

Good luck on the MAF conversion! For some reason I thought you were going to put a MAF meter on an SD---my bad. Sure would like to do the conversion myself. 93 bronco 351.