EFIDynoTuning Forum

Is there any benefit to ramping the timing in any faster or at a lower rpm than the factory table? So far during my WOT pulls im only getting to 20-25* of timing at top of the rpm range. So basically im averaging around 15* of timing throughout the pull until the last 500-1000 rpm. Im not mod motor guy so the timing tuning aspect is new to me. on my 5.0 pushrod engine im at total timing around 3200rpm.

impossible to give an answer since you didn't specify the engine or mods

2v's usually want around 11 degrees down, 16 at 2k, 17-18 at 3k ramping to 20 degrees up top (5k+). Anymore almost always slows them down.

4v high compression like a good bit of timing down low but around 2k rpm you have to drop timing to prevent detonation and you usually hold steady ~14 degrees past peak tq where you can ramp up to 17-19 deg up top for C heads. B heads tend to want 27 degrees up top.

4v low compression will take all that the B head high compression will.

Boost severely aggravates 4v engines by design so at peak turbulence (could be at very low rpm like the 4cyl volvo 4v around 1100 rpm) or could around peak tq ~3800 rpm or so typical of stock 03/04 cobras you have to yank timing out quite a bit as they don't need it.

My bad i thought i had my signature updated with the current engine specs. My car has a stock 97 mark viii short block with 04 9 thread heads, longtube headers and 01 cobra intake cams. everything else is stock per 03 mach 1.

you may i have signatures disabled. Best to put it in your profile in user control panel so it shows up on the right like your 86 capri. That is what thats there for.

cool you'll be in the 4v high compression ranking then. that will all apply to you.

on N/A 4v engines I always recommend "de-tuning" them to run 87 octane. You only loose a few hp and you get better economy out of the deal. Not to mention the fuel is cheaper too.

Should take 4* out of the entire timing table to run 87? im running 93 now with the stock table have zero detonation that i can hear. i plan on finding the knock sensor harness before summer and re-enable the knock sensor hardware.

not sure how accurate the HP and TQ logging is but it has my car at a little over 300hp and around 290tq. the tq curve is nice and flat!

One last thing, I have a 90mm lightning maf on the shelf. Would be worth it to install or just stay with the stocker?

Go pull my 87 octane marauder tune and copy the spark table out of her

if u got ot you might as well toss it on