My friend had an OBDII scanning tool made by auterra and it says my timing is aound 30deg idle and it hit 42deg on a wot run

 

Is that like the total timing or something?

 

That is definitely total timing. I don't think your truck would make it through a run with 30 degree's of timing.



:santa:

 

Don't tell me I've been misunderstanding this all this time! You guys must speak a different language; I was told these trucks have 12 degrees of timing under full throttle; to me that means 12 degrees total. Done a lot of blown motors and aftermarket efi setups. When we say it has 30 degrees of timing under boost that's what we mean. 12 degrees sounded like no timing at all but I can't argue because all the tuners and guys say the same thing. Now it sounds like you've been speaking of timing like you do the pulley; 6# pulley means 6#'s more than stock for a total of 14. I get that. Are you saying that when you say 12 degrees of timing you meant 12 degrees more than idle, which may be 30 degrees, for a total of 42?

Jody

 

Thirty degrees at idle is normal. There's no way you're hitting 42 at WOT though, it might be an interface error with that scan tool.

 

lets say i have 15º of timing at WOT.

is that 15º more then base timine or is that total timing?

 

I stand corrected.

--Joe

 

Whoa.... everybody hold up. The number that shows up on a scan tool (or is programmed in a chip), is TOTAL timing, not an adder. On the older distributor vehicles, like the 5.0, you had a base timing. That base timing could be adjusted by turning the distributor. If base timing was stock 10*, and PCM timing showed 25 degrees, you had 25 degrees total timing. If you turned the dist 4 degrees advanced, and showed 25 degrees on a scan tool, you'd really have 29 degrees total. If you pulled the SPOUT connector, which disabled the PCM timing, you had ONLY the base 10*. Now on our trucks, base timing is set and not adjustable, via the crank sensor and trigger wheel. Whatever your PCM shows for timing, is TOTAL, not an adder ontop of some base number. Hope this helps .

 

So under full throttle these trucks have 12 degrees of timing when stock? They start at 30 degrees at idle and pull back to 12 degrees under full boost, correct?


Jody

 

It's a tad different for the different years. For example, your 03 stock has 4 degrees at WOT at 2500, 8 at 3500, 10 at 4500 and 11 at 5000. An 00 has 10 at 3500, 13 at 4500 and 14 at 5000. However, there are many other factors that affect timing such as IAT and ECT temps, and many spark adders/multipliers, so at any given time, you may see a degree more or less than programmed.

 

I get it. That's what I thought until I saw the post about 42 degrees and 30 at idle. My basic math started me thinking that when people said 12 degrees of timing, they were talking the difference between idle and full throttle (sensors, air temp, etc. withstanding).

Until I got my 03 Lightning I had never run across a car (or truck) that used so little timing. Of course head design, cam, etc. all affect what a particular combo wants, but the blown engines I've done would have hated that low amount of timing!

Thanks Sal as usual.

Jody

 

HI!... Hey SAL : I went to the dyno a few weeks back to get some A/F's done. This was done with a SNAP-ON scanner during the runs. Do these timing #'s look right to you??????

RUN 1

RPM SPARK

2611 33
2665 17
2817 19
3284 20
3495 22
3728 24
3968 25
4050 26
4325 26
4876 24
5158 24
5443 25


RUN 2

RPM SPARK

2839 33
3000 21
3301 23
3518 24
3761 26
4014 28
4286 28
4545 28
4820 28
4980 27
5267 40

1st run was with SUPERCHIP on normal side with stock 80mm MAF in 3RD gear.

2nd run was race side with "L" 90mm MAF in 3RD gear.

Thanks.

 

Looks about right Neal, for an NA truck. Your timing changed when you put the different MAF on, because you didn't change the calibration for it, so it's got completely different load values now (not good for the trans, BTW). If you can give me your PCM code, I can check my software and see what stock is for you.

 

HI!... SAL : The code is BOJ4. Actually the chip was set up for my 24LB injectors and 90mm MAF by JAY at SUPERCHIPS. I was warned that it would be hit or miss due to the 24LB'ers. I'm still running the stock 80mm with it currently since it makes more power and driveability. MIKE T is currently working on a new 4-bank chip for me with that new "SUPER TUNE"? technology that just came out. But the new chip won't be done for a bit, probably after X-MAS. Thanks for the help, I was just curious about the timing. By the way the load #'s were almost at 100% with the 80mm MAF but only in the high 60's with the 90mm MAF. She definately needs a tune!

 

Neal, even thought the chip was "corrected" for the 90mm, it really wasn't. I've seen lots of SC programs that were "corrected" for MAFs, but none of them were ever done right. All they had changed was A/F, none of them ever had the correct MAF x-fer curve put in. So your load was still not correct (hence the differences you saw), just your A/F was corrected to account for the new MAF leaning the truck out because it wasn't corrected for it properly. I'm sure Mike T will take good care of you, he's a good guy. If you ever want to give us a try, you know where to find me.