Pleased w/ dyno results... - Page 2 - ZR-1 Net Registry Forums

Aurora40 · 09-21-2008

Did they measure the A/F ratio at the tailpipe? I've heard that reads about .5 leaner than it actually is, since the cats will do a little something to clean it up. Otherwise it looks like it's in the 14:1 area which seems to me like "don't drive it hard 'til you fix it" kind of lean.

Paul Workman · 09-21-2008

Quote:

Originally Posted by Aurora40

Did they measure the A/F ratio at the tailpipe? I've heard that reads about .5 leaner than it actually is, since the cats will do a little something to clean it up. Otherwise it looks like it's in the 14:1 area which seems to me like "don't drive it hard 'til you fix it" kind of lean.

Yes it was fm the tailpipe. I was wondering what affect the cats would have to the a/f ratio. .5 lower than actual would put it pretty far up there. The comment from the dyno operator was as yours...Don't be pushing it to hard too often till you get that corrected.

Roger that. I think we're all in violent agreement thar!!

Thanks Bob for the info re the a/f vs. cats/no cats. Good to know.

P.

XfireZ51 · 09-21-2008

Paul,

Here's an example of my AFR curve taken the other day. Its right around 12.8 -12.9 at the top measured at the tailpipe. I have no cats however. Ignore the scaling for hp. Couldn't fit it into the pic.

flyin ryan · 09-22-2008

makes good jam for a stock 90 if you ask me. Hammer, wanna post your #'s from Portland?

09-21-2008	#11
Aurora40 Join Date: May 2005 Location: Leesburg, VA Posts: 2,713	Re: Pleased w/ dyno results... Did they measure the A/F ratio at the tailpipe? I've heard that reads about .5 leaner than it actually is, since the cats will do a little something to clean it up. Otherwise it looks like it's in the 14:1 area which seems to me like "don't drive it hard 'til you fix it" kind of lean. __________________ Bob Saveland Former owner of #2517 [IMG]http://a.random-image.net/aurora40/vette.jpg[/img]

09-21-2008	#13
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,710	Re: Pleased w/ dyno results... Paul, Here's an example of my AFR curve taken the other day. Its right around 12.8 -12.9 at the top measured at the tailpipe. I have no cats however. Ignore the scaling for hp. Couldn't fit it into the pic. Last edited by XfireZ51; 03-08-2024 at 03:10 PM.

09-22-2008	#14
flyin ryan Join Date: Aug 2006 Location: Edmonton, Alberta or Phoenix, Arizona Posts: 2,741	Re: Pleased w/ dyno results... makes good jam for a stock 90 if you ask me. Hammer, wanna post your #'s from Portland? __________________ There are no limit's mans ingenuity, just as mans ingenuity will never conquer the forces & behavior of this planet...Smokey Y.