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Alex · September 8th, 2009, 05:50 PM

Turbos are much less finicky than they once were. With better cooling now, it's no longer required to keep the engine running for a long while after parking the car. In years past if you did that the oil would coke up and cause premature seal failure. The Mazda engine does run some pretty high boost (almost 16 psi) and has quite a high compression ratio for a turbo. The electronics on it dial things back enough to keep the engine reasonably reliable. For example, at max revs, the ECU actually has already dialed the throttle back almost 50%. The throttle pedal is only an electronic switch wired to the ECU, which then decides the right amount to actually open the throttle plates.

Open up the breathing, including just adding a cold-air intake, and it can cause some overboost issues if you go full throttle at low revs. Causes the engine to stutter as it hits its boost limit, releases it, and comes back on again. For max speed and smoothness, the car responds best to keeping it between 4k and 6k RPM, even when running it hard. Nothing to be gained winding it out to redline, and keeping it much lower than 4k doesn't allow for full power. Very different from the high-revving honda engines I was used to, but the torque and response from this motor is almost unbelievable.

September 8th, 2009, 05:50 PM	#13
Alex ninjette.org dude Name: 1 guess :-) Location: SF Bay Area Join Date: Jun 2008 Motorcycle(s): '13 Ninja 300 (white, the fastest color!), '13 R1200RT, '14 CRF250L, '12 TT-R125LE Posts: Too much. Blog Entries: 7	Turbos are much less finicky than they once were. With better cooling now, it's no longer required to keep the engine running for a long while after parking the car. In years past if you did that the oil would coke up and cause premature seal failure. The Mazda engine does run some pretty high boost (almost 16 psi) and has quite a high compression ratio for a turbo. The electronics on it dial things back enough to keep the engine reasonably reliable. For example, at max revs, the ECU actually has already dialed the throttle back almost 50%. The throttle pedal is only an electronic switch wired to the ECU, which then decides the right amount to actually open the throttle plates. Open up the breathing, including just adding a cold-air intake, and it can cause some overboost issues if you go full throttle at low revs. Causes the engine to stutter as it hits its boost limit, releases it, and comes back on again. For max speed and smoothness, the car responds best to keeping it between 4k and 6k RPM, even when running it hard. Nothing to be gained winding it out to redline, and keeping it much lower than 4k doesn't allow for full power. Very different from the high-revving honda engines I was used to, but the torque and response from this motor is almost unbelievable. __________________________________________________ Montgomery Street Motorcycle Club / cal24.com / crf250l.org / ninjette.org ninjette.org Terms of Service Shopping for motorcycle parts or equipment? Come here first. The friendliest Ninja 250R/300/400 forum on the internet! (especially Unregistered)