How do you run rich enough for a turbo without...
03-01-2006, 05:58 AM
#1
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How do you run rich enough for a turbo without...
bigger injectors and a piggy back computer? How is it that the ZPI kit can run 5-6psi without bigger injectors and a piggyback? Is it all in tricking the maf by maf tube sizing, cause even with the ecu seeing more air from the maf it will still only give so much fuel based on the fact that the computer thinks it n/a and not giving enough fuel to run 11-12:1 air/fuel which is in the safe range.
03-01-2006, 05:49 PM
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the real question should be how does ignition timing get adjusted? its been proven that the A/F ratio changes, as the MAF sees more air and the ecu compensates for more air. the maf sees more air via turbo than it ever would via NA, but somehow the factory ecu keeps adding more fuel, almost like Toyota engineered the car for boost from the factory due to the S/cer....YET it has also been shown that timing does not change at all. So instead of running say 23 degrees of timing at 6psi, the car runs the factory 28 degrees or whatever it is.
this is also proven from the ZPI dyno test that showed thier s/c'd car making 20-30lbs more torque than most reflashed SC'd cars. as timing is relative to torque numbers.
this is also proven from the ZPI dyno test that showed thier s/c'd car making 20-30lbs more torque than most reflashed SC'd cars. as timing is relative to torque numbers.
03-01-2006, 05:54 PM
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yeah, more timing equals more torque=more hp.
I didn't know that the more air the maf sees the richer it runs, that is flippin awesome. I only want to run about 4psi for a little bit until I buy fuel managment so I think ~4psi with a rich af/r and the stock timing shouldn't be to bad.
Ive heard that ZPI doesn't run the stock size maf tube. is that true?
I didn't know that the more air the maf sees the richer it runs, that is flippin awesome. I only want to run about 4psi for a little bit until I buy fuel managment so I think ~4psi with a rich af/r and the stock timing shouldn't be to bad.
Ive heard that ZPI doesn't run the stock size maf tube. is that true?
03-02-2006, 12:22 AM
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Fuel and timing table in the Scion adjust off one another. Where on a typical engine a ECU would not pull timing until the knock sensor would pick up detonation while this is usually to late especially on new low emission cars. The Scion ECU actually adjusts timing off A/F. We can lean the car out without and timing control and watch the ECU on a scan tool lean itself out. While this is only a safe margin within reason this does provide an additional safety window over that of a typical setup.
Please do not take this the wrong way as the boost increases and the margin of reasonable error reduces this is not an acceptable way to tune the car. But on 6PSI this is more the acceptable, there are stage 0 cars with 45k on them that prove the longevity is there also.
Please do not take this the wrong way as the boost increases and the margin of reasonable error reduces this is not an acceptable way to tune the car. But on 6PSI this is more the acceptable, there are stage 0 cars with 45k on them that prove the longevity is there also.
03-02-2006, 07:20 PM
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Originally Posted by ZPIracing
Fuel and timing table in the Scion adjust off one another. Where on a typical engine a ECU would not pull timing until the knock sensor would pick up detonation while this is usually to late especially on new low emission cars. The Scion ECU actually adjusts timing off A/F. We can lean the car out without and timing control and watch the ECU on a scan tool lean itself out. While this is only a safe margin within reason this does provide an additional safety window over that of a typical setup.
Please do not take this the wrong way as the boost increases and the margin of reasonable error reduces this is not an acceptable way to tune the car. But on 6PSI this is more the acceptable, there are stage 0 cars with 45k on them that prove the longevity is there also.
Please do not take this the wrong way as the boost increases and the margin of reasonable error reduces this is not an acceptable way to tune the car. But on 6PSI this is more the acceptable, there are stage 0 cars with 45k on them that prove the longevity is there also.
03-02-2006, 08:24 PM
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Originally Posted by Typhoon
Gota give it to zpi for doing all the testing and stuff on this instead of just assuming something like that is safe.
03-05-2006, 06:03 PM
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The solara project is coming along nicely the ECU is not as smart as the tC and it will require a piggyback ECU even at low boost levels....well at this time anyway. We are limited at the stage 0 type kit until we finish with the ESK development as the car we have here to do R&D on is a auto.
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