I was thinking (scarry I know), when you go to WOT in our cars it goes to a open loop of set parameters of spark and fuel tables. What is the total timing and when does it come in fully? does this mean that changing the inital timing doesn't affect the total timing? I know some of you tweekers out their know this
yes changing initial timing will change WOT timing. That's why it is a common 'mod' so to speak. All EEC tables are based off 10 degrees initial timing. Depends on what EEC you have as far as WOT timing though. X3Z WOT timing is 26 degrees while A9L is 27-28 degrees at WOT
26-28 degrees at WOT, no wonder these cars beg for more timing. so it just adds the initial onto the timing table, thats what I was betting. do you know what the the total timing on a DA1 speed density car is? I am guessing its lower, becasue it has been my experiance that SD cars like a lot of timing (I was running 20 inital at the track last time and it loved it)
So just to make sure I understood him corectly what he said is that asuiming 10 deg initial the total timing is 31.25 deg and comes in max between 3500-5000 RPM. that is a lot more timing that the mass air cars have. My best 1/4 mile time I was running 20 deg of inital timing and that would mean I was runing 41.25 deg total. Man that is alot. maybe that is why it always seems like stock SD cars are faster than stock mass air cars
that is a very good info, and i tried my car on the track and my best run was on 16º initial and i started on 12º...
Seeing that this is a "Timing" thread.......What should i have my timing set at? My car is basically stock. Thanks
What ever works best without spark rattle. Just bump it 2 degrees at a time and go drive it. Make sure you have 93 octane in the tank. When you hear spark rattle then back it off a few degrees and go with it. **Note** A car with a 'fresh' timing chaon will be able to run more timing than one with say 100k miles on the timing chain due to the 'stretch' that occurs over time
I used to run 13 degrees (on 89 octane normal street driving) and 16 degrees at the track with 93 octane. I just got another 5.0 and I've set the timing to 13 degrees again... I think it's ok but it's hard to say for sure since it has softball sized holes in both mufflers, does anyone have any input on a safe base timing for a mid grade fuel ??
ok im a little confused so what exactly is initial timing? Is it the timing marks on your cam and crank gears or wat? and how do u get overall timing? sorry i m N0obie!
inital timing is where you set your timing with the spout connector unplugged. (also known as base timing) Disconnecting the spout (or jumper as it is called by some) that is in the wiring harness near the distributor locks the computer out where it cannot control the timing. Total timing is the timing that your car sees with the computer hooked up at WOT. OEM settings are 10* base and the computer adds around 17-18 degrees to that at WOT, which makes your total timing 27*-28* at WOT
Just for grins let's assume that you used the A9L EEC, which is the most common one used for the SD conversion. Then let's assume that you you are running the stock A9L GUFB strategy. If all of the above is true the following is what your WOT vs. RPM table for spark advance looks like: RPM ttl advance 16383.75 26.00 5000.00 26.00 3500.00 22.00 2600.00 22.50 2150.00 21.50 1800.00 18.50 1000.00 8.00 0.00 8.00 0.00 8.00 yes this is TOTAL advance and includes the 10*base note the dip in advance at 3500, which is where a stock 5.0 develops peak torque yes, below 1800 rpm based on WOT and RPM only, it pulls two degrees there are modifiers for: WOT vs. ACT WOT vs. BP WOT vs. ECT these three attributes will change the numbers in the table I gave you above if they are not in their "normal" operating range. So if your engine is up to operating temperature (> 86*<236*), your inlet air temp is around 150*(<240*) and the barometric pressure is above 26.5, the table is good to go with. If you want to know more, pm me and I can walk you through it all, it's fairly simple once somebody shows you the "road map" of how the EEC looks at WOT timing.
