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dcb · 09-09-2008, 11:05 PM

Cool, some more unsolicited thoughts:

Note the analogRead*1000 reading and the pressure gauge reading at minimum pressure.

Note the analogRead*1000 reading and the pressure gauge reading at maximum pressure.

Note the analogRead*1000 reading and 25% pressure. At 50% and 75%

Graph and determine linearity or if curve function needed to predict pressure from analogRead.

the injectorDelay is probably a lot less than the typical 500. That initial pulse probably isn't 500us long. Might just be 100 us. How long is the pre-pulse?

The flow is a function of time and differential pressure. You have the input pressure, might need to guess at the BMEP (150.8 x TORQUE (lb-ft) / DISPLACEMENT (ci) ). Given that your injectors are at like 3000 psi at idle, and bmep is maybe 300 psi at full throttle? It won't represent more than a %10 error, should be much less. But worth thinking about.

What is redline on that anyway?

09-09-2008, 11:05 PM	#25 (permalink)
dcb needs more cowbell Join Date: Feb 2008 Location: ÿ Posts: 5,038 pimp mobile - '81 suzuki gs 250 t 90 day: 96.29 mpg (US) schnitzel - '01 Volkswagen Golf TDI 90 day: 53.56 mpg (US) Thanks: 158 Thanked 269 Times in 212 Posts	Cool, some more unsolicited thoughts: Note the analogRead1000 reading and the pressure gauge reading at minimum pressure. Note the analogRead1000 reading and the pressure gauge reading at maximum pressure. Note the analogRead*1000 reading and 25% pressure. At 50% and 75% Graph and determine linearity or if curve function needed to predict pressure from analogRead. the injectorDelay is probably a lot less than the typical 500. That initial pulse probably isn't 500us long. Might just be 100 us. How long is the pre-pulse? The flow is a function of time and differential pressure. You have the input pressure, might need to guess at the BMEP (150.8 x TORQUE (lb-ft) / DISPLACEMENT (ci) ). Given that your injectors are at like 3000 psi at idle, and bmep is maybe 300 psi at full throttle? It won't represent more than a %10 error, should be much less. But worth thinking about. What is redline on that anyway? __________________ WINDMILLS DO NOT WORK THAT WAY!!!