WOT Spark Advance

[PCGUY112887]

I see about 26-28 on premium at WOT, I planned on testing out a bit higher. I run up to 42 in other places though.

[AaronGTR]

I haven't gotten into my timing table yet, but I'm planning on getting an EGT gauge before I do. It's my understanding that EGT's are greatly affected by timing changes. Sometimes you can have good AFR's, add timing and not get any knock, but not greatly affect your peak power either and end up increasing EGT's. The biggest thing I will be looking for with timing changes will be low end torque and engine response. If I can increase peak HP without raising combustion temps too much thats great, but I doubt I will be able to do much in the high rpm range without an intercooler or methanol/water injection.

[torq455]

for my mostly stock 3.1 i'm running the 180 stat, 91 premium, and 30*. on a hot day 85+ i'll get 1-3 KR in 3rd (old tranny) at around 90 MPH.

[rsisbetter]

I know this is an entirely different setup, but I run 30-40* on a stock 3.1 with a Haltech E6k with no problem at all. The weird thing is I couldn't feel any difference between 20 and 35-40? Maybe the 3rd GEN motors respond better?

i guess we'll find out soon, with the "A" that is....

[IanSzgatti]

im trying to follow this here a bit... when does combustion typically begin? or is that variable with throttle position? I'm thinking it is... but when you all talk about 20 or 30 whatever degrees, are you talking about when you want combustion to be at it's peak?

[torq455]

total timing at WOT is adjusted to 30 degrees before top dead center. that's when combustion begins. combustion at it's peak pressures = a crap ton of force, but = detonation or preignition occurs if the combustion event happens to soon.

[z284pwr]

I guess this would be as good a place as any to ask this one....which would definintely throw off actual timing for the Haltech guys....

Does anyone know the angle the crank trigger is at BTDC?

[rsisbetter]

I guess this would be as good a place as any to ask this one....which would definintely throw off actual timing for the Haltech guys....

Does anyone know the angle the crank trigger is at BTDC?

i did reading and the FSM said " each notch is 60* apart, and the reference notch 10*, this being after #2 ignition signal".

also, did you mean BDC? or TDC?

[bszopi]

Any of those help out?

[z284pwr]

[/img]http://60degreev6.com/forum/gallery/files/5/5/7/1/crank_trigger_Model.jpg[/img]

[/img]http://60degreev6.com/forum/gallery/files/5/5/7/1/crank_trigger_Layout1_001.jpg[/img]

[/img]http://60degreev6.com/forum/gallery/files/5/5/7/1/crank_trigger_Layout1.jpg[/img]

Any of those help out?

I think I'll just stick with what I have after the pictures, so yeah, they helped.

i did reading and the FSM said " each notch is 60* apart, and the reference notch 10*, this being after #2 ignition signal".

also, did you mean BDC? or TDC?

I'm going to stick with the 60*. The Haltech wants "Trigger in Angle - °BTDC " (Before Top Dead Center)

When I first setup my Haltech, I was told 70°, then I have found another person that has suggested 67° and I have 60°.

I'm mainly curious because my EGTs have risen quite a bit between the Haltech and the original ECU even though I have the timing programmed to within a degree of each other right now. This had me thinking the trigger degree setting was wrong so the timing wasn't exact.

[Superdave]

59.8 degrees is the spark referance angle for the 60 degree V6 using a 7x trigger

[OldSkoolGP]

Later this summer I'll be spending a day on a dyno with my car trying to find the best spark advance for all driving conditions. Hopefully owning a WB O2 now, it'll be the only thing I have to tune for on the dyno.

[rsisbetter]

thats interesting, mathematically that very well could be the problem

I think I'll just stick with what I have after the pictures, so yeah, they helped.



I'm going to stick with the 60*. The Haltech wants "Trigger in Angle - °BTDC " (Before Top Dead Center)

When I first setup my Haltech, I was told 70°, then I have found another person that has suggested 67° and I have 60°.

I'm mainly curious because my EGTs have risen quite a bit between the Haltech and the original ECU even though I have the timing programmed to within a degree of each other right now. This had me thinking the trigger degree setting was wrong so the timing wasn't exact.