EFIDynoTuning Forum

Pappacosworth

afr

spark

Pappacosworth

Manual, 3.73 rear. Ignition order has been same before. Car is 1988 Mustang GT, was with map ecm. Wiring repinned to 1994 schematic, no ccrm, egr, thermactor. 4 pin maf, iat sensor at intake. No fault codes. New injectors (1995 Tbird SC), values from Tbird calibration.
Stock airbox, new filter.

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Cylinder Head Volume (cc)	61
Cylinder Head Vol (cubic in.)	3.721
Piston Head Volume (cc)		-2
Piston Head Vol (cubic in.)	-0.122
Gasket Thickness (in.)		0.039
Swept Volume (cubic in.)	38.267
Gasket Bore (in.)		4.1
T.D.C. Volume (cubic in.)	4.318
Cylinder Bore Diameter (in.)	4.03
Gasket Volume (cubic in.)	0.515
Deck Clearance (in.)		0.016
Note: Neg. number above deck, Pos. number below deck	
Deck Volume (cubic in.)		0.204
Stroke (in.)			3
STATIC COMPRESSION RATIO	9.862
OPTIONAL DATA
Rod Length (in.)		5.09
Adjusted Stroke (in.)		2.528
Intake Closing Point (degrees) ABDC @ 0.050 lift plus 15 degrees	
				54
DYNAMIC EFFECTIVE COMPRESSION RATIO	8.468

Pappacosworth

13726548 351w / H.O. order used

Pappacosworth

Good point. Compression test 157-160 psi so DCR should be correct.

Pappacosworth

Yes, timing is correct. Cam is timed with degree wheel, and damper markings checked.

Pappacosworth

Car is 1988 Fox, ECM is 1994 cobra with CBAZA strategy. Fresh rebuild with new parts, block is original: 030" over, forged balanced bottom end, Trickflow 170 heads with rollers, Trickflow stage 2 cam timed according to cam card. 61 cc head volume, -2 cc pistons, 0.039" gaskets. Piston little under deck 0.02"
Comp ratio 9.8. Edelbrock performer copy intake, 70mm tb, bbk shorties. Car is slow... afr error under 5%, timing little over standard. Any tips before I start disassembling it again?

ajocl14 2021_Oct_31_16-46-40.zip: wot accelerations near end; (922.58 KiB) Downloaded 197 times

Pappacosworth

Would it be difficult to swap s197 ecm to 2003 Mustang and have everything functional, except pats.

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Re: New rebuild, strange loss of power

Re: New rebuild, strange loss of power

Re: New rebuild, strange loss of power

Re: New rebuild, strange loss of power

Re: New rebuild, strange loss of power

New rebuild, strange loss of power

Re: Ideal ECM recommendation for new motor?