Best plugs to look at to see if the car is lean?

[95zsean]

I think I read that cylinders 1 & 2 are the lean cylinders? Just checking to make sure, for reading the plugs at the dyno with NO2 on the 25th.
Thanks

[gregrob]

On a nitrous application I would be looking at the rear-most cylinders as far as fuel goes.

The "best "way to do it is to pull every plug.

How big of a shot are you spraying and what kind of nozzle?

If you're spraying 150 or less or up to 200 on a good plate like Nitro Daves I would pull one from each bank and you should be good.

If you're going with a really big shot, I would pull EVERY plug.

I would be looking at timing more than fuel. If you have it on a dyno you should have access to a wideband correct?

I would set the AFR in the high 11's, then look at the plugs for timing.

Just my opinion, take it FWIW and talk to some bigger nitrous junkies than me! I'm still on a baby shot :devil:

[joelster]

Hrmm, i've always heard that the rear cylinders are the leanest. A little trick you can do to better balance the cylinders is to get all of your injectors flow tested and/or cleaned and then re-tested. Then you take the injectors that read the highest and put them into the cylinders that run the leanest. You'd be very surprised how far off some of them can be from one another.

[95zsean]

You know how hard it is to get them all out. So I was hoping to only check the lean cylinders on each bank. I'm going to run a 100 shot on the street and 150 at the track, through a shark nozzle. If I like Nitrous LOL.. I'm going to buy a plate from Dave at Nitrous outle. Dave did tell me to look for about 11.3 A/F from the wideband so thats what I'm shooting for. The guy that runs the Dyno has experiance with NO2 but not on F-bodys, so I'm hoping everything will go well. We will also use timing to make the plugs look right. He wants to cut the plugs open to look at them, so it's a good thing I bough 16 BR7EF's...LOL.

Thanks

[95zsean]

Hrmm, i've always heard that the rear cylinders are the leanest. A little trick you can do to better balance the cylinders is to get all of your injectors flow tested and/or cleaned and then re-tested. Then you take the injectors that read the highest and put them into the cylinders that run the leanest. You'd be very surprised how far off some of them can be from one another.

I have a set of 30# SVO that I had cleaned and tested and their with in a point of each other. As much as I hate fords there SVO injectors are very well matched. So I guess it's 7 & 8 plug to be looking at.

Thanks