Nissan 370Z Forum - View Single Post

indyn · 04-19-2011, 12:50 PM

Found this in the service manual

"This mechanism hydraulically controls cam phases continuously with the fixed operating angle of the intake
valve.
The ECM receives signals such as crankshaft position, camshaft position, engine speed, and engine coolant
temperature. Then, the ECM sends ON/OFF pulse duty signals to the intake valve timing (IVT) control solenoid
valve depending on driving status. This makes it possible to control the shut/open timing of the intake
valve to increase engine torque in low/mid speed range and output in high-speed range."

Seems like an another way to extract power besides playing with a/f ratios and ignition timing.

And why is hard to tune the VVEL, as it is a form of cam but not fixed. Instead of releasing a new engine I would see Nissan doing this to produce more hp from the same engine for any upcoming vehicles. This is what I got from service manual

VVEL SEN LEARNB1
VVEL SEN LEARNB2 - unit in Volts • Indicates the VVEL learning value.

VVEL POSITION SEN-B1
VVEL POSITION SEN-B2 - unit in Volts • The VVEL control shaft position sensor signal voltage is displayed.

VVEL TIM-B1
VVEL TIM-B2 - deg • Indicates [deg] of VVEL control shaft angle.

VVEL LEARN - YET/DONE • Display the condition of VVEL learning YET: VVEL learning has not been performed yet. CMPLT: VVEL learning has already been performed
successfully.

I see all the VVEL parameters to do atleast a mild tuning. I don't think Cobb AP Race software could give access to the VVEL tables, I guess Uprev does.

04-19-2011, 12:50 PM	#1 (permalink)
indyn Base Member Join Date: Apr 2011 Location: farr north Posts: 241 Drives: 11 BMW 335i 6AT Rep Power: 14	tuning the Intake valve timing control? Found this in the service manual "This mechanism hydraulically controls cam phases continuously with the fixed operating angle of the intake valve. The ECM receives signals such as crankshaft position, camshaft position, engine speed, and engine coolant temperature. Then, the ECM sends ON/OFF pulse duty signals to the intake valve timing (IVT) control solenoid valve depending on driving status. This makes it possible to control the shut/open timing of the intake valve to increase engine torque in low/mid speed range and output in high-speed range." Seems like an another way to extract power besides playing with a/f ratios and ignition timing. And why is hard to tune the VVEL, as it is a form of cam but not fixed. Instead of releasing a new engine I would see Nissan doing this to produce more hp from the same engine for any upcoming vehicles. This is what I got from service manual VVEL SEN LEARNB1 VVEL SEN LEARNB2 - unit in Volts • Indicates the VVEL learning value. VVEL POSITION SEN-B1 VVEL POSITION SEN-B2 - unit in Volts • The VVEL control shaft position sensor signal voltage is displayed. VVEL TIM-B1 VVEL TIM-B2 - deg • Indicates [deg] of VVEL control shaft angle. VVEL LEARN - YET/DONE • Display the condition of VVEL learning YET: VVEL learning has not been performed yet. CMPLT: VVEL learning has already been performed successfully. I see all the VVEL parameters to do atleast a mild tuning. I don't think Cobb AP Race software could give access to the VVEL tables, I guess Uprev does.