Below is the dyno from the last dyno day (blue graph) at Ragetek in Davie, FL. with the temps in the 90's. Does anyone think it is too lean? I don't want to take the chance of blowing the motor, and I am really thinking about doing a water/meth kit which hopefully will richen it up some. The cooler weather is on the way and that means the engine will run even leaner... Let me know what you guys think....Thanks!

 

Ok, before everyone hops on this I would like to clarify things...

First off, don't worry your car isn't running lean, in fact its running right where it should be.

Now let me explain this, if you look at where your A/F ratio is 15.05 you are at 2500 RPMs. Your car is not going more than maybe 10mph. However, it is getting anywhere from 70-90mph of wind pushed into from the fans on the dyno...this is why you see your car leaning out at 2000R RPMs. Until your car is under full load (i.e. >3000RPMs) you can't really worry about the A/F measurement while you are on a dyno. If you worry about everything before 3000RPMs then you would have issues with how much hp/tq you are producing as well...just can't do it.

You have to look across the RPM band while the car is under full load. If you look at your graph you will notice that your peak A/F ratio is right around 12.8ish. This is just right, as the tail pipe sniffer used to determine A/F generally reads about .5-1 point leaner than it atually runs so your peak A/F is somewhere between 11.8-12.4. Don't fret. Everything is just fine with your tune and your A/F ratio. I'm more upset that the guy who ran your dyno for you did not tell you this if you brought up the A/F ratio while it was on the dyno...

Secondly, nice power/tq curve.

 

When tuning turbos, we go down to 11.5 AFR at full boost.

Water/Methanol is the wrong way to go. Water/Methanol is used to allow aggressive timing under high-boost conditions, not try to make up for lean AFRs.

Also, how often do you plan on filling your water/methanol reservoir? And where do you plan on putting it?

What would be more effective here is some ECU tuning, if that's possible.

 

Great info guys! I'll get it dynon-ed again when the temps drop. Curious to see where it's at when the intake temps are about 30 degrees cooler. Thanks!

 

To get it out in the open, WEEKEND YEAH

If your interested in riching up the engine, raise your fuel pressure 3 to 5 pounds. This will increase your fuel delivery thru the injector. I have been perfecting that method and have been rewarded with reasonable f/a mixtures over a wide range of DA's.


WEEKEND YEAH

Woody

 

Not a bad torque curve at all, mine was flat as cold be till the snd time i went to the track still trying to figure out the cause, im putting in new plugs and wires next week and i'm going to try a few runs with 100 octane... because it may just be a timing issue.