AFR Tuning on 175 shot of NOS

[moparcrazy]

Wondering what you guys mite be setting / tuning your air flow ratios at, with out nitrous it's at 12.9 and with a 175 shot, it Buries the Gage !, go's to 10, I've gone from a 71 jet to a 59 and its still at 10, I've read guys going as low as 39 ??
"what do you guys think" its a 440 with a 1000 CFM Pro-systems Carb

 

[PurpleBeeper]

However you slice it 10:1 air:fuel ratio is piston-melting lean. Have you considered going up a size in NITROUS (fuel side) pills?

Wait... I think I have that backward.... you're shooting for about 14.5 : 1, right? (or at least 13.5:1). If you're 10:1, aren't you RICH? In that case, go down carb jet size (or better yet in my opinion, go down in fuel pill size)

 

[lxmodguy]

However you slice it 10:1 air:fuel ratio is piston-melting lean. Have you considered going up a size in NITROUS (fuel side) pills?

Wait... I think I have that backward.... you're shooting for about 14.5 : 1, right? (or at least 13.5:1). If you're 10:1, aren't you RICH? In that case, go down carb jet size (or better yet in my opinion, go down in fuel pill size)

Um, 10:1 is super rich........Setup it at about 11.3-11.5 assuming there is no ethanol in your gas. If it has 10% ethanol I would target 11.1-11.2. Go up a size at a time until you land in the mid 11's. My guess is 3 jets on the fuel side. This is a wet setup correct?

 

[moparcrazy]

Yes Wet and 10 to 15 % Ethanol ! I'll Double check, Thank You !!

 

[moparcrazy]

However you slice it 10:1 air:fuel ratio is piston-melting lean. Have you considered going up a size in NITROUS (fuel side) pills?

Wait... I think I have that backward.... you're shooting for about 14.5 : 1, right? (or at least 13.5:1). If you're 10:1, aren't you RICH? In that case, go down carb jet size (or better yet in my opinion, go down in fuel pill size)

Yes sir 13. is where I'm at with out Nitrous, and yes again, 10 is Way-FAT or Rich, i keep dropping the Jet on the Nitrous side and the Bitch is still Fat !! So i Guess as long as its fat and not rich ill keep Going !! Lol !!

 

[Jeremiah]

Monte Smith told me to go 12.8-13.0 for my little plate kit. A "175 hp" tune made over 200hp on my 511" low deck with a single QuickFuel 1050-AN. The engine also made it's best dyno pull around 12.7ish.

 

[lxmodguy]

A naturally aspirated engine will make its best horsepower at 12.7 ish. A forced induction engine (nitrous or boost) needs to be mid 11's typically to survive. So you can enjoy making a ton of power with forced induction at 12.7........it just wont do it for very long.

Here is a link to an article about it. There are LOTS and LOTS or opinions. I can honestly tell you out of hundreds of nitrous motors I've tuned I haven't lost one that I know of.

http://www.hotrod.com/articles/hrdp-0411-plate-nitrous-systems/

 

[moparcrazy]

A naturally aspirated engine will make its best horsepower at 12.7 ish. A forced induction engine (nitrous or boost) needs to be mid 11's typically to survive. So you can enjoy making a ton of power with forced induction at 12.7........it just wont do it for very long.

Here is a link to an article about it. There are LOTS and LOTS or opinions. I can honestly tell you out of hundreds of nitrous motors I've tuned I haven't lost one that I know of.

http://www.hotrod.com/articles/hrdp-0411-plate-nitrous-systems/

WOW GREAT READ !! TY !!

 

[lxmodguy]

Welcome, happy to help man. I have been tuning for over a decade at this point. There is so much out there and so much "here's how I do it" itt's nice to see articles like this.

 

[Gpuller]

I haven't noticed any difference in readings going from 10% ethanol to non ethanol fuel.