RX7Club.com - Mazda RX7 Forum

Quote:

Originally Posted by rxspeed7 (Post 11035695)

That's exactly like our drag or any all meth car. You have to run twice as much fuel as you would with pump but the advantages are still worth it to run it. Albeit it takes twice as much. Lol. I really wish I could tell you what Afr we run on it but the car is tuned solely off egt and sound(carlosmis super old school) but I will admit, it works flawlessly and has worked for many years for him. Even his NHRA sport compact car he won the championship with was set up exactly as this car and tuned the same way with a mechanical injection setup.

I thought 4.8 lamba was the place to be, but that is not so. A guy by the name of Bob Szabo has a fuel calculator that Mechanical Fuel Injected guys can use for $50 a year. He also has really good books from his site at RaceCarbooks.com. What he shows you as the boost goes up the AFR must go with it. The problem is that Lamba can only read down to around 4.0. When you boost to 30lbs, you need to be down at 3.0-3.6 AFR and richer if you have good engine temp, and a good spark setup. Bobs calculator will give you the AFR numbers you are looking for along with system fuel preasure.