Best Air Fuel Ratio to tune for

[SC V6]

I was curious what ratio I should try for when I go to the dyno... anyone have any recommendations?

[JoeB]

The general tuner recommendation is 12.5:1. However, every engine is a little different. Some people like to run a little richer on the top end for protection since that's where the biggest potential for catastrophic damage can result. For example tune to 12.5:1 up to about 4,500-5,000RPM then 11:1 after that. Personally, I tuned for a flat 12.5:1 accross the board. On the low end, it's closer to 13:1 and on the high end, it's closer to 12:1. You actually get a little more power when you run it leaner but you are taking a risk. -JoeB

[Paladin06Greg]

Seems like you and I, along with our dyno-tuners have the same ideas in mind. No guts, no glory!!

The general tuner recommendation is 12.5:1. However, every engine is a little different. Some people like to run a little richer on the top end for protection since that's where the biggest potential for catastrophic damage can result. For example tune to 12.5:1 up to about 4,500-5,000RPM then 11:1 after that. Personally, I tuned for a flat 12.5:1 accross the board. On the low end, it's closer to 13:1 and on the high end, it's closer to 12:1. You actually get a little more power when you run it leaner but you are taking a risk. -JoeB

[DatSRBoi]

I feel stupid.I dont really know what yahz are tlaking abuot...nor even how u guys are tuning it..i see no buttons...

[cdssolara]

They're referring to adjusting their fuel delivery to make the best power at various rpm ranges. The numbers they're talking about is the ratio of fuel to air in the combustion chamber. This procedure is usually done during a tuning session on a dynomometer, and is called a dyno tune. You have to have a wide band O2 sensor or similar gauge to determine the ratio of fuel to air. For our cars you will also need an S-AFC, Split Second FTC, or some other device to get the ECU to deliver more fuel. During the dynotune, you adjust the amount of fuel to get to an optimal air/fuel ratio. At a ratio of 14.7:1, all the air and ful will be burned. They're referring to lower ratios, which mean more fuel or a richer mixture. If you get too much air you will run lean, which can cause the engine to blow up.

[xyntax]

Are you guys talking about tuning just the boosted ones? It's kinda different when it comes to all-motor tuning right? There's more room to take it leaner there...

[DatSRBoi]

so if my car is stock all i need is a S-AFC and a dyno place to do it? or will i need allot of more parts to work with it? Im very interested in this yet dont know how to hook them and all...but i can get one for 200 bucks...so master teach teach...

[Paladin06Greg]

That's true if your dyno-tuner has a wide band 02 sensor and any place worth their weight in salt should.

so if my car is stock all i need is a S-AFC and a dyno place to do it? or will i need allot of more parts to work with it? Im very interested in this yet dont know how to hook them and all...but i can get one for 200 bucks...so master teach teach...

[DatSRBoi]

so in the end ill be spending abuot 500 bucks in all huh for the installation, buying it, and tuning it and learnin how to work it huh? and Paladin06Greg i think ur car is awesomee...

[Paladin06Greg]

That's about right but it could be more.

Thanks for the viewing and I hope you took the time to rate my ride. LOL

[cdssolara]

so if my car is stock all i need is a S-AFC and a dyno place to do it? or will i need allot of more parts to work with it? Im very interested in this yet dont know how to hook them and all...but i can get one for 200 bucks...so master teach teach...

The guys who started this discussion have superchargers with upgraded pulleys. Those will tend to make the car run lean, so it is essential for them to get a dynotune and adjust their fuel delivery. In addition to keeping their engines running safe, it will allow them to maximize their horsepower. If you're basically stock, you'll get some benefit by adding an S-AFC or similar device, and having you're car dynotuned. Personally, though, I wouldn't spend the money to do that until you get supercharged and also upgrade your exhaust system. Unless you do that, you'll be spending a lot of money for not very much benefit.

[Paladin06Greg]

All that you say is true. Also doing all the things I've done can be more costly then you imagine. I just lost pistons and rings in my motor and it only had 26000 miles. Well it gives me the excuse to build a REAL motor since that was what I wanted all along.

[ quote="cdssolara"]

so if my car is stock all i need is a S-AFC and a dyno place to do it? or will i need allot of more parts to work with it? Im very interested in this yet dont know how to hook them and all...but i can get one for 200 bucks...so master teach teach...

The guys who started this discussion have superchargers with upgraded pulleys. Those will tend to make the car run lean, so it is essential for them to get a dynotune and adjust their fuel delivery. In addition to keeping their engines running safe, it will allow them to maximize their horsepower. If you're basically stock, you'll get some benefit by adding an S-AFC or similar device, and having you're car dynotuned. Personally, though, I wouldn't spend the money to do that until you get supercharged and also upgrade your exhaust system. Unless you do that, you'll be spending a lot of money for not very much benefit.[/quote]

[impactX]

It's not just about a fixed air-fuel ratio.

Like someone said, every car is different, some cars run ideally at 11.5:1.

You really need an experienced tuner to do the tuning if you want the max out of your engine.

[SolaraT]

so in the end ill be spending abuot 500 bucks in all huh for the installation, buying it, and tuning it and learnin how to work it huh? and Paladin06Greg i think ur car is awesomee...

I think after your 2000th post you will know alot more then you do now.

Anyway. Man Scott I realy want to see some hp numbers of your car now. I am so excited for you and all the mods your doing.

Later.
Louis