gotcha..i plan on using a lightning maf with 42 # injectors but i haavnt decided which brand.

 

The Global Spark Modifier adds 2° spark on top of whatever the PCM has calculated to be the appropriate timing. At idle and low loads, in closed loop mode, this may as much as 45° to 50° advance.

This is the same thing that the vacuum advance did mechanically on a plain ol' distributor. At periods of high vacuum (idle and low loads) the vacuum advance would actually rotate the contact point plate to advance the timing by as much as 45°--this is why you had to disconnect the vacuum line when setting the base timing.

At higher loads, in open loop mode, the PCM uses programmed data to calculate the timing, the 2° global is added, and then as long as the total advance is <= that specified for the current load and rpm in the Spark Borderline table the calculated value is used. If the calculated value is > then that in the table then the table value is used.

The rpm range based spark settings in Special Forces change entries for higher loads in the Spark Borderline table.

Here's the table as shown in DeltaForce, showing the stock values (black) and the values for my current tune (blue)...



I run a +2.5° global setting and +3° in the rpm based settings.

 

I wanted to get sniper SF one day after i found out the dyno place charges $650 for a tune, essh! I'm going to have a cobra MAF that's calibrated for my 24lb injectors, would i have a problem with the SF one?

EDIT: oh yea, goes it account for CR in the timing and octane? becuase ill be around 10.5:1 after the swap, but I'm not going FI anytime soon, so you know.

 

I think that Cobra MAF you have is an option on Special Forces. I'm using a BA3000 from SCT and that wasn't an option on SF. I told them and they already have an update that I still have to download.

If worse comes to worse you can email your tune to sniper and they will adjust for your combination.

 

so it does read right.. hmm

 

Yup...

 

would it be worth it to get a tuner with just
cold air intake
catted x pipe
catback
upper intake and throttle body.

 

i was wondering the same thing. i plan on going f/i in the next year or 2 but for now im looking for some options on mild tunability. i have a similar set up (o/r x, catback, cai...and plan on getting a tb and spacer soon. i want tunability for the idiot(me) with out spending a ton and this seems to be the best bang for your buck tuner out there.

 

I ordered my sniper special forces tuner last week and will be getting it hopefully this coming week. I have a stock MAF, will that be fine? or will i end up having to buy a new MAF?

 

ull be fine, there is a special procedure in the booklet for roush/saleen mustangs.