Timing questions

[stang2841]

I got my car at the shop and I want to know how much timing im gona be able to run,


I filled it up with 93 octane, but the problem is I had it at 87 before and I had a notch under a half tank so what does that make? 90 octane?


I know every car is different with this


but after I get it back from the shop with the timing bumped will there be any SOTP difference?


Right Now I'm having my shop do

weld in subframes (and touch up torque boxes)
BBK lowering Springs
Custom Dumps rather then stock tail pipes
timing advance



hopefully she'll drive like a different car with the suspension mods and be louder.

 

[CRASH7772]

If you bump the timing you have to run 93. Most stock 5.0's like between 10-14.

 

[stang2841]

Im aware Ill have to run the most octane I was just wondering how far I could go with half 87 and half 93 for right now

 

[Daggar]

If you bump the timing you have to run 93. Most stock 5.0's like between 10-14.

This is not necessarily true. Before the Kenne Bell install I ran 89 octane gas (mobil and Sunoco mostly) and 16* of timing. I should also note that the compression ratio on an 86 is a tad higher than later year stock Stangs. I would be very suprised if you ever had to run more than 91 octane gas on an otherwise stock motor with 16* timing advance. More than likely you'll still be able to run 89 gas. Also of note: You will most likely make more with 14* timing and 89 gas than you will with 16* timing and 93 gas. I mention that incase it becomes and issue with your particular car. Higher octane gas does not burn as hot or as completely as lower octane gas.

 

[CRASH7772]

Like you said above...every car is different. 10-14 is pretty much the norm for a non-engine modded 5.0 regaurdless of octane. There might be a freak stocker that will run over 14 but most are 12-13 range.

 

[stang2841]

whats average RWHP if it runs to 14-15 degrees?


2-4rwhp? possible?

 

[stang2841]

ttt

 

[stang2841]

ttt

 

[stang2841]

ttt

 

[Daggar]

whats average RWHP if it runs to 14-15 degrees?


2-4rwhp? possible?

That's a pretty broad question. I don't think there is one answer. It would be kind of like asking how much HP you gonna get with a new H-pipe. It varies motor to motor.

 

[stang2841]

whats the average gain.

 

[Kdubslugga]

From what ive heard from a 10 degree to a 14 + degree bump you could see 10 flywheel HP. I was able to go to 15 without any detonation, and i know theres a difference, and i rarely feel any SOTP gains

 

[HISSIN50]

you aint gonna feel anything under 15 hp anyhow. the timing advance is more for crispness - not like a real power adding mod in the conventional sense.

things like carbon build up, leaning out, temps, etc (and a ton more) all determine how much timing one can run. no magic number. pick an octane and then set timing so you never hear pinging. in the summer you might have to back timing off and in winter, one can add some (ambient temp and engine operating temps make a difference).

good luck.