Optimal A/F ratio
Thread Starter
Joined: Jan 2007
Posts: 11,941
Likes: 33
From: Conroe, Texas
Optimal A/F ratio Never used a wide band on my cars with nitrous, and i assume that 12.5 is decent for the engine while on the gas, just looking for acceptable parameters before i put all this **** on my 5.3, the kit maxes out at 150 and i think that will be great for the little engine, it pulls hard as hell to 7000 right now, so the nitrous will help it roll out way better once i get it figures out for the track, going to swap to a 3800 converter as soon as i get the chance to remove the trans to send the 3000 back.
Dont know how long the 3.23 geared 10 bolt will live, so we will find out.
Dont know how long the 3.23 geared 10 bolt will live, so we will find out.
Interesting read from YB.com - should answer what you are looking for.
http://www.yellowbullet.com/forum/sh...d.php?t=320764
http://www.yellowbullet.com/forum/sh...d.php?t=320764
Guest
Posts: n/a
I would run between 11.4-11.8 as a good starting point. But as you will be told over and over again. The WB is just a point of reference for what the plugs tell you. It is a tool to help tune with. Not a the sole instrument to make fueling adjustments off of.
Plug reading is not too terrible hard and you can always post plug picture to allow me and some of the other users here to help you along the tuning process.
Plug reading is not too terrible hard and you can always post plug picture to allow me and some of the other users here to help you along the tuning process.
Guest
Posts: n/a
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Like Dave said, read the plugs and just use the WB as a reference. When I tuned my car I really didn't even look at the WB until I was done tuning. Now I just log it to make sure nothing major has changed. My WB reads 12.5 on nitrous, as long as it keeps reading that and I dont make any changes I dont pull all the plugs each pass. Every motor will be a little different and sometimes some WB's dont seem to read right on nitrous, always let the plugs dictate the tune up..
Thread Starter
Joined: Jan 2007
Posts: 11,941
Likes: 33
From: Conroe, Texas
^Exactly, one guy told me that he ran a 150 nitrous jet and a 75 fuel jet just to achieve a proper A/F ratio since the N2O systems come so safe on the rich side from the factory, CRAZY.
Guest
Posts: n/a
But even we revamp jetting from time to time. We may have some neat changes coming soon on a similar note
Thread Starter
Joined: Jan 2007
Posts: 11,941
Likes: 33
From: Conroe, Texas
Well, i have several tell me they had to swap nitrous and fuel jets around to get them right as well. So far on a friends car we put a NOS 150 nitrous and 100 shot fuel to get it to 11:1 A/F ratio.
Guest
Posts: n/a
Older NOS systems are INSANELY rich. But that was just the times. Not hating as everyone thought that way. Just stating a fact.
Its the same way on the FI side... People run their cars stupid rich, but they can do it and not tear stuff up... We can't.
One of my buddies with a turbo car flipped out when I told him I was leaning out my car that was on the bottle and ran 12.2 on the WB. Plugs were fat as hell and he couldn't understand not seeing 11.3 ish AF.
Ask Kempf, Brown, Fireball, Phil etc. what their AFR looks like. We don't drive diesels.
One of my buddies with a turbo car flipped out when I told him I was leaning out my car that was on the bottle and ran 12.2 on the WB. Plugs were fat as hell and he couldn't understand not seeing 11.3 ish AF.
Ask Kempf, Brown, Fireball, Phil etc. what their AFR looks like. We don't drive diesels.
Pretty much. Truthfully I don't care what my wideband says, it's just there incase something weird happens, I can go back and see what it did on the log. Picking up 20 plugs in the morning to go testing Saturday. Maybe I'll get some good plug pics this time of where we run it.
Here's a good thread about it
https://ls1tech.com/forums/nitrous-o...-plug-run.html
Here's a thread I started asking pretty much the same thing
https://ls1tech.com/forums/nitrous-o...g-reading.html
I need to read up on this stuff again. I was all about it last year but never finished my car and I haven't kept up with it.
https://ls1tech.com/forums/nitrous-o...-plug-run.html
Here's a thread I started asking pretty much the same thing
https://ls1tech.com/forums/nitrous-o...g-reading.html
I need to read up on this stuff again. I was all about it last year but never finished my car and I haven't kept up with it.
Thread Starter
Joined: Jan 2007
Posts: 11,941
Likes: 33
From: Conroe, Texas
I had been driving on this plug, not much, but made a hit at 100 fuel and 150 nitrous jet, this was 11:1, A/F ratio, since then i got it to 11.5 to 1, but that plug was hit, then drove home probably a mile, i will see if i score some fresh plugs later, that plug has idle and drive time, the idle is plenty lean usually, 16:1.
That picture is useless for a/f reading. Fresh plugs, full hit, kill the key at the stripe, pull the plugs then post up pics. Cut down AS MUCH idle time as possible. Once you take a good picture of the plug like you did above then cut the threads off the plug and take another good picture of the porcelain and we will explain how to read your fuel ring.
Something like this to go by, and before you guys start I know it was RICH!
Something like this to go by, and before you guys start I know it was RICH!
Not bad at all Carter.... looks pretty close, cant really see a timing mark.
I wouldnt touch the fuel ... sneak some timing in it 1* at a time see if it picks up.
Zones89.... DEAD RICH.... and looks like to much timing, when you pull fuel from it the timing mark will creep back farther... I would pull 4* out and go down 4 sizes on the fuel jet.
I wouldnt touch the fuel ... sneak some timing in it 1* at a time see if it picks up.
Zones89.... DEAD RICH.... and looks like to much timing, when you pull fuel from it the timing mark will creep back farther... I would pull 4* out and go down 4 sizes on the fuel jet.