Advance Timing

[Banshee 79]

My Compression right now is at 160 psi. I am running on pump gas, if I advance my timing 4 degrees do you think i will have detonation on pump gas? I really dont want to run race gas. Thanks!!

[Bansheeo831o]

IMHO, yes. It seems to be the common thought among HQ'ers that advancing your timing 4 degrees for anything above 150psi is going to mean Race fuel..or atleast a mix of it, just my two cents

 

and by the way..if you do decide to advance it...it will knock your socks off

 

jus remember at that compression..you need more octane = money going

 

Lol good luck man..hope more hq members post, i may be wrong(but i doubt it)

[Stinger]

I'm running 153psi and +4 timing on 91 octane...been doing it for a year now.

[RNBRAD]

Just depends, you could detonate and the next person may not.

[Ducman]

My Compression right now is at 160 psi. I am running on pump gas, if I advance my timing 4 degrees do you think i will have detonation on pump gas? I really dont want to run race gas. Thanks!!

430665[/snapback]

 

It would be cutting it real close. You would definitly want to make sure that your main jetting was a bit rich if you do go +4 on pump fuel. Also, you wouldn't want to run it WOT if the motor was running real hot as this can also contribute to detonation. If you do go +4 with 160 psi you'd be plenty safe if you added 1 gallon of 110 octane to every 4 gallons of 91 octane pump fuel, resulting in 95 octane mix.

[Banshee 79]

Thanks for the replies guys !!!!

[slowpokebanshee]

I run 8 degrees with milled head (.030") and with 91, heard detonation, now I just add a little octane boost (pep-boys, eight bucks) and it treats ten-gallons, way cheaper than race fuel, and easier to find.