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Spark Timing

Old 04-03-12, 09:50 AM
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Old 04-10-12, 01:06 AM
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Originally Posted by rxspeed7 View Post
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 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.
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Old 04-15-12, 09:40 PM
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good read.
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Old 09-07-18, 12:05 PM
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Cylinder pressure / Burnt mass curve

Hello Arghx, can you send me the sources where these curves come from ? Thanks
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