Ronny

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On break in I was seeing BLM at 108 and WB 02 reads at 13.0-13.4 in closed loop. Idle A/F same. Old engine was 350 and new engine 396. I changed only the BPC to 173. It fouled the nitrous plugs. Put in new non nitrous plugs and I pulled 10% from choke and VE vs coolant and 10% from VE entire table. Ran again on street and BLM remained ay 108 and A/F on WB stayed at 13.4/1. Car ran great on 30 mile ride at all speeds 0-70 MPH. The tune was perfect on the 350.

Now my friend and professional mechanic thinks the volumetric efficiently is now much greater hence the need for fueling less. I don't buy that.

I pulled anothern10% as before but could not flash as car is not available getting new(bigger) exhaust at muffler shop.

Not at all what I expected.

During break in as fuel was getting to engine from tank initially engine did some popping as I expected. Possibly the VAFPR vac line blew off the TB? I will not know that till I visit shop.

Dominic Sorresso

Galaxie500XL

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Ronny

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Hi Dom...."common man throw me a bone"

Yea I changed the BPC for a 396. 24 lb injectors at 43 lbs fp. Oddly enough it was pig rich. I should have checked the vac line from the Aero VAFPR but assumed it was attached. The mechanic would not have overlooked. But when break donein it was popping initially. That we think was due to a retarded initial spark setting. May have blown off the line? Today the exhaust is being done at a muff shop. I will know more in a few days.

Dominic Sorresso

Ronny

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Dom: I know that. I was just trying to be humorous.....OBTW too much power for a crossfire, a 396 is anyway. Only drove it 30 miles so far.

Ronny

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OK.... I think have a reason for the significant enrichment I experienced. On setting the initial timing and 10 minute break in after I had a datalog running showing rich on BLM and WB and exhaust burning eyes. On ride to exhaust shop it seemed the braking was diminished. However I had not driven car since July 2017. Brakes were looked at during restoration and were VG. Map reads were higher than prior engine after logging the ride 30 miles to other shop. Datalog showed 9% being pulled globally. I think the lower VAC was increasing fuel pressure(VAFPR). Also cam overlap is greater with new cam (236/242@.05 112 LSA vs old 224/230 114LSA). Also that would explain the braking. Lower VAC would also move the fueling to cells with higher MAP same RPM and larger values for fuel.

Comments please.

Dominic Sorresso

Ronny

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Yes...