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I have a 2003 G35 which has the Nissan VQ35DE engine, rated one of the best engines of all time. It has been rock solid for me, not one issue in >190K miles.

Does anyone know if the Q50 has a similar engine, and what about the hybrid? I really hope I won't be taking a step down by buying the hybrid if it's untested and possibly not of the same quality.

If I have some reasonable assurance that the hybrid engine will be as reliable I will be purchasing that. Thanks ahead of time for any advice and thoughts.
 

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The hybrid has the 3.5L engine while the gasser has the 3.7! It should be the same as the on in the M35h but not sure if its the same as the G35! It would suck if it was the same since i would have loved to have transferred my polished plenum! :(
 

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The hybrid has the 3.5L engine while the gasser has the 3.7! It should be the same as the on in the M35h but not sure if its the same as the G35! It would suck if it was the same since i would have loved to have transferred my polished plenum! :(
Our salesman stated the hybrid 3.5L is that same as the M35h (slightly modified).
 
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Hybrid is 3.5L so just check what engine the M35h has and you've got your answer!
 

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I don't think it is the same, your G35 has a VQ35DE where as the Q50 Hybrid uses a VQ35HR which has dual intakes. Similar engines but the VQ35HR is higher performance engine.
Thanks for pointing that out! I knew there was something different that I couldnt point out for some reason! Completely forgot about that dual intake!
 

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Demystifying the engine codes:

VQ35DE: standard 3.5 liter
VQ35HR: High Rev version, more top end hp and higher rpm limit, lots of new parts
VQ37VHR: High Rev version with VVEL, a little more power on top

Interesting note from wikipedia on the VQ35HR: "It has NDIS (Nissan Direct Ignition System) and CVTC with hydraulic actuation on the intake cam and electromagnetic on the exhaust cam. Redline is 7,500 rpm. Reportedly over 80% of the internal components were redesigned or strengthened to handle an increased RPM range sporting a lofty 7,500 rpm redline."

http://en.wikipedia.org/wiki/Nissan_VQ_engine#VQ37VHR
 

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I wonder why Infiniti didnt go with the VQ37VHR for the hybrid? It would of made 19-20 more horsepower....bringing it to a very respectable 380HP.

Maybe VVEL was too complex to integrate with the hybrid system?

I would love to see what Nissan has up its sleeves for the future engines? It would be REALLY sweet to see turbo hybrid....the mpg figures would be amazing and so would the power.
 

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I wonder why Infiniti didnt go with the VQ37VHR for the hybrid? It would of made 19-20 more horsepower....bringing it to a very respectable 380HP.

Maybe VVEL was too complex to integrate with the hybrid system?

I would love to see what Nissan has up its sleeves for the future engines? It would be REALLY sweet to see turbo hybrid....the mpg figures would be amazing and so would the power.
Packaging and weight I imagine. The 3.5l is smaller and lighter than the 3.7l engine and offsets the weight of the hybrid components.
 

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Whatever it is, I am curious

On a side note...Ive driven both a G35 sedan with the HR and I drive my G37 everyday....the 35HR is a much smoother engine....
Well, I'm not sure that's a fair comparison. The 3.7l has been criticized (by the press, not owners) as being harsh, thrashy, and uncouth. However, I think the engine is probably ok but the original programming of the 7AT is what screwed things up. The Q50's refined 7AT gets it right, because the engine hasn't changed and the Q50 exhibits none of the G37's bad behavior under the hood.

I've heard lots of service managers say that the 5AT was much better than the (older) 7AT from an owner's perspective, even with the hard 1-2 shift when the engine was cold and the poor mileage due to a relatively low final drive in 5th gear. I guess customer after customer coming in, previously owning the 5AT, complaining that the 7AT needed fixing, led them to this conclusion.
 

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I wonder why Infiniti didnt go with the VQ37VHR for the hybrid? It would of made 19-20 more horsepower....bringing it to a very respectable 380HP.

Maybe VVEL was too complex to integrate with the hybrid system?

I would love to see what Nissan has up its sleeves for the future engines? It would be REALLY sweet to see turbo hybrid....the mpg figures would be amazing and so would the power.
One reason has to be size. With the hybrid, they didn't even have room for the 12-volt battery under the hood - it's in the trunk.
 
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