What's running lean? or rich? which is good?

**TysGTO** · 01-23-2007, 04:04 PM

What's running lean? or rich? which is good? Tell me what I need to know, and how to prevent it....

**99blueZ** · 01-23-2007, 04:08 PM

it has to do with your Air/ Fuel ratio.
Lean= too low
Rich= too high
or it could be the opposite

Neither one is good. You MAF and tune control this mainly.

**TysGTO** · 01-23-2007, 05:21 PM

Well, I getting a AEM Brute force CAI, I have the spintechs superpro's, I have my stock cats, and that's it. Think I'll be fine?

**TysGTO** · 01-23-2007, 05:21 PM

Should I get a hand held tuner?

**Corey1987** · 01-23-2007, 05:54 PM

rich is when ur air fuel ratios are too low, u are putting more fuel in the combustion chamber, lean is when ur AFRs are too high, not enough fuel/too much air is being put in ur combustion chamber, Id much rather be rich than lean bc when u start running too lean, stuff starts melting bc the combustion gets too hot.

**99blueZ** · 01-24-2007, 09:17 PM

Originally Posted by TysGTO

Well, I getting a AEM Brute force CAI, I have the spintechs superpro's, I have my stock cats, and that's it. Think I'll be fine?

yea you will definately be fine. Those mods should only have a minimal affect on rich/lean. You can have full bolt-ons with out a tune and be fine.

Skip getting a handheld - they are pretty limited in what they can do. A dyno tune (while costly) is the best way to go. Though you should wait until you have more mods to get that.

**TysGTO** · 01-25-2007, 02:02 PM

Originally Posted by 99blueZ

yea you will definately be fine. Those mods should only have a minimal affect on rich/lean. You can have full bolt-ons with out a tune and be fine.

Skip getting a handheld - they are pretty limited in what they can do. A dyno tune (while costly) is the best way to go. Though you should wait until you have more mods to get that.

Thanks for all the info 99.

**LS2Tuner** · 01-25-2007, 07:23 PM

Your stock PCM is tuned to try to keep the A/R at 14.7 which is best for emissions NOT horsepower!!! The most horsepower is usually reached around 12.7-12.9 which is a more rich ratio than the stock emissions tune. The Predator hand held can be bought for around $300....... And depending on your local shop that has LS1 Edit or HP Tuners to do a tune on your stock PCM it could cost you a great deal more than that $300......
If your car is a A4 automatic car I can tell you your see a VAST difference!!!

The TQ. management limit power BIG time.
PM me if your interested in a Diablo.
Eighther way there is quit a bit of horsepower to be found by getting your tune for HP and not the government!!!