4.9 (ford 300) I6 conversion

**dave w** · 04-12-2015

I think adding displacement to the V6 .bin file will get you very close.

dave w

**Mr Badpliers** · 04-12-2015

Pardon my ignorance, but the only way I see to do this is to modify the base pulse width. Is this correct? I really do appreciate the information you share with me. I'm pretty excited to actually put this plan into motion.

Chris

**dave w** · 04-12-2015

Originally Posted by Mr Badpliers

Pardon my ignorance, but the only way I see to do this is to modify the base pulse width. Is this correct? I really do appreciate the information you share with me. I'm pretty excited to actually put this plan into motion.

Chris

That is correct. The picture below shows the BPW for a 4.9 liter engine using 61 Lb Chevy 350 TBI injectors.

dave w

**Mr Badpliers** · 04-13-2015

Awesome. I calculated it using the 4.3 injectors and changed the bin. I might bump up to 5.0 injectors if I have a fueling issue. Would I get better atomization if I bumped up the fuel pressure and left the bpw the same? I think I might have some issues with fuel puddling in single barrel adapter.

Or would it be best to leave the bin stock for the 4.3 until I have a running engine, and see what happens. The volumtric efficiency of the 4.9 might just be bad enough for it to be about right. I'll use the o2 sensor and try to get an average added values on blm then work on the tables to get a good estimated open loop mode program. This should be fun.

Chris

**dave w** · 04-13-2015

I think there might be an upper limit on BPW? I think it would be a good plan to keep the BPW in the 150 range? Most V8's have BPW of about 135, yet the 4.3 seems OK with a BPW of 184.

Ideally, I like to see the VE table with low numbers not much lower than the low 40's with the high VE table numbers not much higher than the low 90's.

Ideally, I like to see injectors running at or near stock fuel pressures.

Personally, I favor the newer TBI computer 16197427 (1993 ~ 1995) with red / blue connectors for a project like yours. The 1619727 computer uses actual injector flow Lbs / Hr and actual displacement parameter, not a BPW. The 16197427 computer is 8192 Baud rate, about 50 times faster than the 1227747 crawling along at 160 Baud.

dave w