Timing/AFR tables for n/a power

majorownage · October 25th, 2011, 07:36 AM

How much timing should I be running in a b headed 4.6 with IMRCs?
What about the AFRs?

Currently I have a stock thermostat, but I am installing a 160 this weekend.

For now, I just copied the stock max allowed timing tables into the borderline table.

From 3k to 5.5k = 21*
Above 5.5k=24*
I have my commanded AFR set at 12.5 from 3k on up.

With a 160* thermostat I'm hoping I will be able to add more timing mid range.

I don't have a wideband.

bitemark46 · October 25th, 2011, 10:23 AM

Total timing or timing advanced from stock?

My total timing is...

0-4k: 34*
4-7k: 32*
A/F: flat 13.0 to 7k.
93 octane.
Stock tstat with one 1/8" hole drilled in it at 12 o' clock.

majorownage · October 25th, 2011, 10:38 AM

Originally Posted by bitemark46

Total timing or timing advanced from stock?

My total timing is...

0-4k: 34*
4-7k: 32*
A/F: flat 13.0 to 7k.
93 octane.
Stock tstat with one 1/8" hole drilled in it at 12 o' clock.

Boy thats a bunch. With imrcs I shouldn't require that much correct? (of course while they are closed)

bitemark46 · October 25th, 2011, 02:56 PM

No, with the IMRC's you don't need as much. I only added a lot to make up for the torque loss in the lower rpm range with my deletes.

October 25th, 2011, 07:36 AM	#1
majorownage Regular Join Date: Jun 2010 Posts: 424 iTrader: 0 reviews	Timing/AFR tables for n/a power How much timing should I be running in a b headed 4.6 with IMRCs? What about the AFRs? Currently I have a stock thermostat, but I am installing a 160 this weekend. For now, I just copied the stock max allowed timing tables into the borderline table. From 3k to 5.5k = 21* Above 5.5k=24* I have my commanded AFR set at 12.5 from 3k on up. With a 160* thermostat I'm hoping I will be able to add more timing mid range. I don't have a wideband. __________________ 1998 Gt full pi swap -Dead and gone 1998 Mark VIII 4.30s, 125 shot, 93 d/s-Daily Driver 1998 BAB Cobra-Project

October 25th, 2011, 10:23 AM	#2
bitemark46 Regular Join Date: May 2008 Location: Tampa, Fl Posts: 397 iTrader: 0 reviews	Total timing or timing advanced from stock? My total timing is... 0-4k: 34* 4-7k: 32* A/F: flat 13.0 to 7k. 93 octane. Stock tstat with one 1/8" hole drilled in it at 12 o' clock. __________________ -Mark- 98' N/A Cobra (Stock longblock) 11.79 at 114.64 (1.62 60ft)

October 25th, 2011, 02:56 PM	#4
bitemark46 Regular Join Date: May 2008 Location: Tampa, Fl Posts: 397 iTrader: 0 reviews	No, with the IMRC's you don't need as much. I only added a lot to make up for the torque loss in the lower rpm range with my deletes. __________________ -Mark- 98' N/A Cobra (Stock longblock) 11.79 at 114.64 (1.62 60ft)

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