3.8L FWD timing tables

[CTX-SLPR]

Howdy,

does anyone have the timing tables for the 3.8L FWD motors with the DIS ignition? I want to use them as a base for my NA trial of my L67 ECM on an LC2.

Thanks,

 

[Eric Stage I]

Typical timing table, '86 FWD LG3 3.8 SFI

 

[CTX-SLPR]

Yes, massive necro posting but what are the axis labels on this graph? I've been using L67 timing tables but they are assuredly too conservative for an 8:1 NA engine with a 212/212 roller.

Thanks,

 

[34blazer]

LV8 is the X-axis, or horizontal row.

RPM is the Y-axis, or vertical column

http://www.gearhead-efi.com/Fuel-Injection/showthread.php?1795-1228253-16198264-5B1

 

[CTX-SLPR]

Ok... What is LV8? HPTuners has the timing table as RPM vs. Cylinder Air Mass (g/cyl).

 

[34blazer]

LV8 is indicated load, g/sec iirc

 

[CTX-SLPR]

Hmmm... Ok, guess I can just extrapolate the extent of the table to match the same and copy the timing values accordingly. I guess the important thing is that the OEM timing table is calling for 50º of timing lead in many situations!

 

[34blazer]

50* of timing? Which cells?

 

[CTX-SLPR]

96 x 1400-4000rpm in the original image attached to Eric Marshall's post.

 

[34blazer]

That's normal. Its not unusual to have a lot of timing in light load cells, as it helps with fuel economy. There is a far less chance of detonation in those areas since the cylinder temps are lower.

 

[CTX-SLPR]

Still massively different than the L36 table I was using. The 8.0:1 engine was an absolute dog with low timing.

 

[34blazer]

Was the timing a lot less in the L36 bin? How well is it running now?

 

[CTX-SLPR]

Max timing on the L36 was 32.6º at a slightly higher rpm. I've not loaded the new timing tables and tried it yet. Have to double check some things to make sure all is well and I don't have any vacuum leaks before I try driving it again.

 

[34blazer]

Max timing at WOT?

 

[CTX-SLPR]

Ok, I was slightly wrong, I was using an L67 timing table and L36 is a bit higher timing in the high rpm, low load area but not crazily more just a few degrees.
Here's the L67: