Nissan 370Z / G37 VQ37 VVEL camless intake valve system

Nissan's Variable Valve Event / Lift (VVEL) System currently used on the 370Z & G37, but will migrate to other models combined with in-cylinder injection, turbocharger(s), & exhaust cam phasers (not used on VQ37 currently). Also an explaination of the VVEL linkage adjustment that is factory set and not to be touched (Nissan requires heads to be replaced if adjustment is changed!) for performance engine builders developing VQ37 engines. For more info on this subject try:
www.370.com
www.motoriq.com
www.jimwolftechnology.com

Update:
This rig was built a couple of years back as part of a project to build the 3.7 engine for a race engine program. Since then we have built special exhaust cams to match the high lift intake settings but never used them in racing. Due to the unique offset in the valve to cam centerlines that Nissan had to design into the heads to accommodate the VVEL system, the peak velocity of any exhaust cam profile will be limited by the offset wipe pattern radius, which is even more basterdized by the fact that the offset is on the opening side on one bank and closing side on the other, a real cam designers nightmare! Currently we use earlier HR heads that share the excellent coolant and gas flow paths, but with centered cam to valve alignment, allowing for conventional racing cam profiles on intake and exhaust. VVEL for race engines may have advantages, but there are some practical constraints that must be considered.

Category:

Autos & Vehicles

Tags:

• nissan
• vq37
• vvel
• infiniti
• 370z
• g37
• performance
• engine
• jwt
• jim
• wolf
• technology

[therookie93]

@9b8 Yeah that's a very understandable concern. I know in the 370z forums there's some guys talking about TT but are worried about the effect it will have on the valves without messing with VVEL. There are some videos of the TT working well but no one other than tuning shops are brave enough to try it with their own cars.

[therookie93]

@4g63tgsx it's hard to say because no one yet has been able to really figure it out. I'm sure eventually. From what I hear though the VVEL takes the place of a somewhat aggressive cam anyways.

[SparkDischarge]

It would be nice to have a 'conservative' adjustment where the maximum intake valve lift is only increased from 11mm to 12mm. (which then would match the Ford 5.0 in the Mustang)

350hp before 'uncorking' the exhaust

[SparkDischarge]

@Chunderitis What is 'desmodromic' about this system is the intake scaler gets pulled back to zero lift by the camshaft profile.

In BMW's Valvetronic, there is an extra spring. Both systems' intake valve is closed with a normal valve spring.

Nissan system can rev about 10% higher. (see videos of modified: VQ37vhr with 8000 limiter, and BMW N52 with 7250 limiter)

[SSSavage25]

@4g63tgsx

You can tune the VVEL manually using an adjustment screw, I believe it advances/retards intake cam timing. However, ECU tuning will also be required. Once VVEL is cracked and tune-able, you should see a lot of gains, particularly with forced induction.

[oopsmeeturluvers]

would anyone tell me the method of making engine camless with the use of exhaust gases.

[9b8]

My concern with this design would be that there is no shortage of moving parts! Of all the variable timing systems I've seen, this one takes the cake in moving parts. How reliable can it be developed out to be given all those moving parts? Not exactly an elegant design, but still an interesting one.

[walkerscranger]

What is amazing to me is that Nissan spent a lot of research and development to come up with this awesome technology and everyone seems to want to change before they even drive the vehicle.

[4g63tgsx]

this might sound dumb but is it possible to put a different cam in there for Performance or the stock cam is good enough

[ldmcnutt]

I know JWT is a manufacturer and not a tuning shop, but if you can get this worked out to adjust the clevis pin to get maximum lift and duration, you'll have people beating your door down to get you to tune their cars! Maybe you should open a tuning shop..... I'd bring my car to San Diego to have this done.