octane booster

[John Hess]

Can you tell if your computer is directing a spark retard or if the 
engine is pinging?  If the engine is not pinging and spark timing is 
normal, you probably are not suffering from low octane.  Rather, I 
would suspect flow restrictions (exhaust, intake, or both).  You might 
also try to increase the fuel pressure.  This can help at the higher 
flow rates.


----------
From:  gofast at ix.netcom.com[SMTP:gofast at ix.netcom.com]
Sent:  Tuesday, January 07, 1997 8:51 AM
To:  DIY_EFI at coulomb.eng.ohio-state.edu
Subject:  octane booster

Hi guys. I *think* I am running out of octane in my BMW 530i - I have 
high
compression pistons, and the car is choking at high rpms. Have checked 
most of
the obvious things like fuel pressure, filter, etc.

I read here that xylene or Toluene is the way to get more octane. How 
much
should one add to each tank?

What is the minimum octane I would need with 9.5:1 pistons?

Thanks in advance.

Samir Shah
gofast at ix.netcom.com
Stamford, CT