302 to 351w swap - Page 2

93cobra1928 · 12-07-2010, 10:18 AM

I know the cam controls the firing order but if it's SEFI the ECU controls the order the injectors fire.
There are ways to change it but it's a pita. Granted
this is all from fuzzy memory.

EHardy1971 · 12-07-2010, 10:22 AM

Quote:

Originally Posted by QWKSNKE

No you were somewhat correct. ECU does not control the firing order. Just reroute the wires to a 351 order and it should work

Quote:

Originally Posted by TheJeanyus

That's what I was thinking. All that controls the firing order is the way it's wired, right?

True, but the injectors' firing order are controlled by the ECU.

Quote:

Originally Posted by 93cobra1928

I know the cam controls the firing order but if it's SEFI the ECU controls the order the injectors fire.
There are ways to change it but it's a pita. Granted
this is all from fuzzy memory.

You're tracking.

QWKSNKE · 12-07-2010, 11:06 AM

EDIT.. disregard. ...

TheJeanyus · 12-07-2010, 11:29 AM

Quote:

Originally Posted by 93cobra1928

I know the cam controls the firing order but if it's SEFI the ECU controls the order the injectors fire.
There are ways to change it but it's a pita. Granted
this is all from fuzzy memory.

The cam doesn't control the firing order, it dictates the firing order that's necessary to make it work.

I didn't think about the injectors being "fired" by the ECU though. My 351 in my Capri had a carb, so I didn't have to worry about that.

EHardy1971 · 12-07-2010, 11:46 AM

I think there may have been some confusion on the type of EFI Ford used over the years, and I should have clarified. The '87-'93's used batch fire (which royally SUCKS!), and the '94-'96 used SEFI.

QWKSNKE · 12-07-2010, 01:11 PM

Quote:

Originally Posted by EHardy1971

I think there may have been some confusion on the type of EFI Ford used over the years, and I should have clarified. The '87-'93's used batch fire .

Exactly. which is what I had put in my post that edited out. If it is a batch fire system then the ecu does not need to be changed out.

EHardy1971 · 12-07-2010, 01:55 PM

Quote:

Originally Posted by QWKSNKE

Exactly. which is what I had put in my post that edited out. If it is a batch fire system then the ecu does not need to be changed out.

I didn't see your OP, but I forgot to mention batch fire and thought I'd clarify. I wouldn't say for a fact that batch fire went all the way to '93 on all trucks, from my personal experiences. Ford changed a LOT of stuff from year to year, and sometimes mid-year as in the case of the '95's like mine and Waypastcrazy's.

SlowJoe · 12-07-2010, 06:17 PM

he wants 30 bucks for the other ecu. should i just try mine?

EHardy1971 · 12-07-2010, 08:09 PM

Quote:

Originally Posted by joecoupe

he wants 30 bucks for the other ecu. should i just try mine?

Try yours first. Like QWK said, being a batch fire, it should work.

waypastcrazy · 12-10-2010, 10:34 AM

Lol i told you that while back.

12-07-2010, 10:18 AM	#11
93cobra1928 Dazed and Confused Join Date: Mar 2009 Location: Northport, Al Posts: 778	I know the cam controls the firing order but if it's SEFI the ECU controls the order the injectors fire. There are ways to change it but it's a pita. Granted this is all from fuzzy memory. __________________ Proud owner of 93 Cobra #1928 306ci Forged flat tops, Windsor Sr iron heads, FMS X-303 cam, OE Cobra upper and lower, 65mm tb, 70mm maf, 24lb injectors, BBK shorties, Summit H-pipe and Flo-bastards

12-07-2010, 11:06 AM	#13
QWKSNKE 3v's are slow Join Date: Dec 2004 Location: Here and There Posts: 17,152	EDIT.. disregard. ... __________________ 2009 Porsche Carrera S 2008 ///AMG C63.. Eurocharge Tune. RIP 2019 AMG GLC43..wife's 03 F250 SD.. Edge Evo, AFE Stage 1 CAI 08 GT. JBA axle back, FRPP springs, FRPP swaybars.. daughter's 01 Cobra vert... wife's I need a new toy Last edited by QWKSNKE; 12-07-2010 at 11:18 AM.

12-07-2010, 11:46 AM	#15
EHardy1971 Trunk Monkey Join Date: Jun 2007 Location: Home Posts: 5,708	I think there may have been some confusion on the type of EFI Ford used over the years, and I should have clarified. The '87-'93's used batch fire (which royally SUCKS!), and the '94-'96 used SEFI. __________________ Eric 89 LX Coupe-Juiced 01 Lightning-Boost 06 TBSS

12-07-2010, 06:17 PM	#18
SlowJoe Mind Blowing Join Date: Jun 2006 Location: Dawsonville Ga Posts: 3,913	he wants 30 bucks for the other ecu. should i just try mine? __________________ Slow Joe Racing 2008 dodge ram 5.7 HEMI 1993 lx with a 289 and a 3 speed on the floor WTB 1955 t-bird project

12-10-2010, 10:34 AM	#20
waypastcrazy ADDICTED TO SMALL BLOCKS Join Date: Jan 2007 Location: lookout mt Posts: 1,757	Lol i told you that while back. __________________ http://alabamaopencarry.com/forum/index.php One of StreetStangs class clowns! Status:slow as hell! NORTH EAST ALABAMA STANGS