Limits?? (A/F ratio)

[farmtruc]

Checking plugs is probably just as or more important, but when we get down to it, 99% of us aren't going to check the plugs, but should.

For us that have trucks on the aggressive or wild side, plugs are critical.
I for one check mine in the ol truck, but I don't in the avalanche.
It's just not convenient for me to do that on a daily driver that is only running 8psi.

Also, as important as plugs are, nobody out there is going to pay for the extra labor to pull the plugs several times when they have a wideband to tune from.
Some will, and some know the importance of plug reading, but most wont.
Most don't even know how to read them, or when it's important to read them, or even know when to shut the truck off so you get an accurate analysis.

I'm a believer of checking plugs and a/f ratio, but i only do this for FREE on my own vehicles, hahah.


Has anyone seen or used the Innovate 10port data acquisition unit that allows 10 or so sensors to be used at one time. I've always wanted to get that, but it'd be hell to weld in 8 bungs and my setup has stock manifolds, so really not the right setup for that.

[RedHeartbeat]

Now would be a good time for someone to post a link on how to read sparkplugs to see if you have the correct AFR.

[George C]

i posted it up before i think you even quoted it

[DBRODS]

Here are a couple pics of what my plugs look like with the Direct Port setup on the 200 shot. On these pics we had a few too many degrees of timing. But the fuel ring and heat is very happy.. Here is a link for a good read on plugs. Also on this page there are some more good links at the bottom.
Spark Plug Reading 101 by Mike Canter

[PurpleMinivan]

Read your plugs... Use the wideband as just a reference to where YOU OR YOUR TUNER found that your motor is happy at. All tunes on motor setups are different even if they're mirror image setups.(same motor, heads, cam, intake, headers, exhaust, trans, verter, gears, etc. etc....)

^^^The AFR on Jon's truck is at 12.5 on a 200 shot... that's where the plugs show it's "happy spot" is. Too fat of an AFR on N20 will kill a motor fast also.

[farmtruc]

The best way to ensure your engine survives is to:

Leave it 100% stock, hahahah.

[White Devil]

The best way to ensure your engine survives is to:

Leave it 100% stock, hahahah.

LOL! to late for that buddy!!!

So, where should I stay on nitrous??? (a/f ratio)

thanks for all the advice guys!!

[clementeunknown]

Nitrous and boosted apps are good from 10.5:1 to 12.0:1 @ WOT & reduced timing is recommended. Anywhere in between that a/f is acceptable. Feel free to correct me if I'm wrong.

[George C]

Nitrous and boosted apps are good from 10.5:1 to 12.0:1 @ WOT & reduced timing is recommended. Anywhere in between that a/f is acceptable. Feel free to correct me if I'm wrong.

youre wrong. if you run spray anywhere in that region yoru just asking for a hurt motor. 12.1-12.5 good range but plugs tell the true story

ive sprayed at 13.3 before, picked up a S--t load of mph on a 75 shot