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1991 Deville / 1989 BMW 635csi
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Discussion Starter #1
What would be the best degree on the timing for my 4.1? I run unleaded 87 octane fuel and want to set my timing to the best degree for the best performance. Msd EVERYTHING will also be installed around mid december. Already installed new plugs yesterday, msd wires will be next weekend.
 

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1987 D'Elegance 4.1L 1993 Eldo 4.9L 1993 STS 4.6L N* Z rated
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170 Posts
Well the regular timing setting is 10 Degrees BTDC, you can run it at 13 degrees but you would have to use premium.I always wanted to do it on my '87 4.1 but I never got around to it. Now I wanna do it to my 4.9 :sneaky: , that thing is one mean beast. I wouldnt put a whole lotta money into an HT4100, its really isnt worth it IMO.
 

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caddeville said:
What would be the best degree on the timing for my 4.1? I run unleaded 87 octane fuel and want to set my timing to the best degree for the best performance. Msd EVERYTHING will also be installed around mid december. Already installed new plugs yesterday, msd wires will be next weekend.
Factory set timing for 4.9 is 10. It is recomended 6 if regular gasolin is used.
I set mine at 8 and burn 89. Great power and fuel economy! I am not sure but same settings seem to be eligible for 4.1.
 

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1991 Deville / 1989 BMW 635csi
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896 Posts
Discussion Starter #4
thanks, i did change plugs on it and it runs sssoooo much smoother!! I am installing MSD EVERYTHING next month including the ignition. Everything will include; cap, rotor, module, coil, wires, & msd 6A ignition. This doesn't mean i will beat the crap out of it. My 4.1 stock with load in the back is WAY quicker than my dads! I'll have the fastest 4.1 around, it might even be quicker than the 4.5 which is the same shit. What if i set my timing to 12 degrees and ran regular?
 

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1987 D'Elegance 4.1L 1993 Eldo 4.9L 1993 STS 4.6L N* Z rated
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170 Posts
You should probably run premium for any timing advance, I would atleast run mid-grade. A knock sensor would be nice...
 
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