10.0 Afr

[Justin]

Is a 10.0 rich enough to cause an rough ride in boost?

When I boost in 1st and 2nd gear I drop down to 10.0 and it is a rough ride (which is why I don't boost often). Not as bad as a miss and my plugs are new and gapped correctly.

 

[figgie]

10.0 won't cause a rough ride all by itself. What it can do is CONTRIBUTE to fouling of the spark plugs which will cause a rough ride

 

[Rennat]

my friends car does the same thing, we went out tuning today, 16psi and 10.3:1 AF and it wanted to break up, but didnt too bad. i shoot for 11-11.5 whenever i tune.

 

[Syris]

You should be running at bare minimum 11.5, otherwise you are just pig rich

 

[annoyingrob]

Agreed. 10:1 will definitely cause a rough ride. Been there, done that.

 

[Facime]

seeing as 10:1 is the bottom of the scale on most (maybe all?) widebands you could be aproaching 9:1 for all you know. Basically you are off the scale pig rich and yes that can definately cause issues. Before I had Lucy tuned after my rebuild I would hit that far down the scale and it would buck like hitting fuel cut.

 

[honestabe]

The guy who tuned my 1J at RRev Motorsports recently says that for a boosted motor 11.5 is optimum. That is what my 1J is tuned for and it runs strong as hell.

 

[Justin]

Thanks guys.

Just to clarify, I'm not after a 10.0, that's just what I'm at right now. I have not started my tuning process.


Good idea weezL, You may be correct on that, but at the same time it'll fluctuate a few tenths so I think I'm staying higher on the 10 scale but as you pointed out, no way to know


I just wanted to see if that was a possible problem so I didn't try and chase down other shit.



I'll get started tuning as soon as I can find a way to rig my damn Vista lappy to communicate with my maft proness

 

[annoyingrob]

seeing as 10:1 is the bottom of the scale on most (maybe all?) widebands you could be aproaching 9:1 for all you know. Basically you are off the scale pig rich and yes that can definately cause issues. Before I had Lucy tuned after my rebuild I would hit that far down the scale and it would buck like hitting fuel cut.

My NTK wil read down to the 8s, or atleast low 9s.