I know this is a very broad question - and every tune is different depending on spark advance, temp, altitude etc etc.

BUT..... what AFR ratio do you tune for on the dyno ON the spray and OFF the spray?

Im thinking of tuning for 13.0:1 off the spray and 12:1 on the spray.

But I am mostly just curious about the on the spray AFR tune - where is the most power made safely?

Thanks for the answers

------------------
Jeff C - Utah
1994 383 Z28 M6
Bored, Stroked, Splayed, and Sprayed!
www.nvmyz28.com
Utah F-body Assoc.

[This message has been edited by NVMYZ28 (edited July 21, 2002).]

 

13:1 NA and 12:1 with N2O sounds pretty reasonable. You could go a little leaner (12.2-12.3 and 13.2-13.3) and gain a bit of hp at the expense of some security.

Rich Krause

------------------
'95 Z-28 383 with Vortech, nitrous, etc.
"1FASTZ28"

 

Why would you need any aditional security if it was tuned right?

------------------
hchap63@hotmail.com

01/SS, Black A4, TR224/112, ARE stage 2 heads, lid, FTRA, PMAF, PTB, Grott LT, true duals, NGK, ASP pulley, Vig 3200, LCA, poly TAB, Convo pros, ET Streets, 3300 raceweight. Little bit of juice..

Best ET: (All bolt ons) 11.496@116.42 (1.52)

Current best after Head & cam & nitrous:
10.88@124 (1.60)

Motown Muscle King of The Hill winner 6-8-02. Want some? Get some!!

RIP #3 Dirty Dale!!!

 

Consider the variables like ambient temp and humidity, gas quality, load, etc. The amount of power loss from tuning a bit leaner than optimal is quite small. The cost ($$$$) of too lean is quite large.

Rich Krause

BTW: my tune for blower only is 12.5:1, for blower+N2O it's 11.5:1. I am going to lean it out to 12:1 for blower+N2O but no more than that.



------------------
'95 Z-28 383 with Vortech, nitrous, etc.
"1FASTZ28"