question about VVEL, throttlebody, and drive by wire...

Sharif@Forged · 07-27-2009, 04:06 PM

I am not sure where this information comes from, or if something is being lost in translation. The VQ37 VVEL most definately has an intake camshaft, and a throttle plate that works like any other car.

Now, like most newer cars, the TB is of the drive by wire type, with no physical cable connecting the accel pedal to the TB. The VVEL mechanism is on a jack screw, that adjustes lift within a defined area of sweep using a small motor.

I think a lot of this is Nissan marketing of the VVEL, and they are confusing the hell out of people.

Here are some pics of the VQ37 VVEL cylinder heads that we took a while back:

The system is so complex, that I can't really explain it in words, but that black looking upper shaft is what determines lift. There is a camshaft spinning just below it. The camshafts are controlled and secured but a ladder structure. It's almost like a double stacked camshaft.

Definately easier to explain in person, with this cylinder head on a bench.

kannibul · 07-27-2009, 04:20 PM

Nice pics...

Still, the question remains - what happens if the engine is running at 3,000 RPM, and the DC motor is unplugged (simulating a failure)?

I imagine there won't be and destruction of the valves/pistons, etc, since the timing of the cams should still keep everything intact...

Still, it doesn't have a cam in the traditional sense...

Sharif@Forged · 07-27-2009, 08:15 PM

Quote:

Originally Posted by kannibul

Nice pics...

Still, the question remains - what happens if the engine is running at 3,000 RPM, and the DC motor is unplugged (simulating a failure)?

I imagine there won't be and destruction of the valves/pistons, etc, since the timing of the cams should still keep everything intact...

Still, it doesn't have a cam in the traditional sense...

Nothing will happen, other than the car will go into limp mode ,and will not rev much above idle. Nothing will be destroyed...I promise. It still has a defined range of operation, and that range will not break anything.

07-27-2009, 04:06 PM	#1 (permalink)
Sharif@Forged The370Z.com Sponsor Join Date: Dec 2008 Location: Marietta, GA Posts: 840 Drives: 2009 GT-R, 2010 370Z Rep Power: 19	I am not sure where this information comes from, or if something is being lost in translation. The VQ37 VVEL most definately has an intake camshaft, and a throttle plate that works like any other car. Now, like most newer cars, the TB is of the drive by wire type, with no physical cable connecting the accel pedal to the TB. The VVEL mechanism is on a jack screw, that adjustes lift within a defined area of sweep using a small motor. I think a lot of this is Nissan marketing of the VVEL, and they are confusing the hell out of people. Here are some pics of the VQ37 VVEL cylinder heads that we took a while back: The system is so complex, that I can't really explain it in words, but that black looking upper shaft is what determines lift. There is a camshaft spinning just below it. The camshafts are controlled and secured but a ladder structure. It's almost like a double stacked camshaft. Definately easier to explain in person, with this cylinder head on a bench. __________________ Sharif@Forgedperformance.com General Manager/Certified Tuner/NASA-PCA-BMWCAA Instructor JRZ RS1's Available NOW...PM me Cobb ProTuner, Uprev ECU Flash, FCON Vpro, Haltech, Motec Certified

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07-27-2009, 04:20 PM	#2 (permalink)
kannibul A True Z Fanatic Join Date: Jun 2009 Location: Jenks, OK Posts: 2,281 Drives: 370z Touring/Sport Rep Power: 269	Nice pics... Still, the question remains - what happens if the engine is running at 3,000 RPM, and the DC motor is unplugged (simulating a failure)? I imagine there won't be and destruction of the valves/pistons, etc, since the timing of the cams should still keep everything intact... Still, it doesn't have a cam in the traditional sense...