400hp?

DrBacon · 08-18-2021, 08:00 PM

Quote:

Originally Posted by takemorepills

It's not that simple. Here's some facts gleaned from Infiniti Q experiences during the VQ/VR transition:

-The 400HP is underrated. RWD cars are getting very close to rated crank HP at the wheels, this is proven by years of dyno comparisons. (AWD Q60 weighing 600+ pounds more than this Z can get to 60 in 4.4!)

-The VQ is a high-revving, moderate torque engine. It's actually better than most other NA designs, however the VQ is WAY down on OVERALL power. The torque from the VR30 is available from 1600-5600 revs, whereas what little torque the VQ makes is at a peak. The VR30 has a very broad power band, and makes more power all the time than a VQ. Also, think about driving at elevation, it'll be a revelation!

-The VR can be tuned way further per $ than a VQ. JB4 piggyback will give you a very noticeable kick in the pants. VQs need an optimistic butt-dyno.

-VR is smoother than VQ, which can seem agricultural (to me at least, but VQ exhaust sounds awesome) with the windows closed.

The VR is not perfect, the VQ will likely beat it out for long term reliability since it's not boosted, but for enthusiasts it's a WAYYY better engine.

Without a doubt the VR is a much better engine platform, as soon as it becomes more widely accessible in the Z's more companies will invest in development for it. As I understand it the best built VR's are stuck in the 800whp range? I'd guess this will change soon enough now that there will be more demand.

My only real complaint about it is it's direct injection only, so either frequent walnut blasting is required or a good catch can setup early on.

tvfreakazoid · 08-18-2021, 10:07 PM

Quote:

Originally Posted by DrBacon

Without a doubt the VR is a much better engine platform, as soon as it becomes more widely accessible in the Z's more companies will invest in development for it. As I understand it the best built VR's are stuck in the 800whp range? I'd guess this will change soon enough now that there will be more demand.

My only real complaint about it is it's direct injection only, so either frequent walnut blasting is required or a good catch can setup early on.

This is a known issue with carbon build up, so why didn't they also add port injection. Makes no sense. Just another expense unfortunately

I'll be in my bunk!

takemorepills · 08-19-2021, 11:30 AM

Quote:

Originally Posted by tvfreakazoid

This is a known issue with carbon build up, so why didn't they also add port injection. Makes no sense. Just another expense unfortunately

I'll be in my bunk!

I previously owned a 2016 GTI with DI. Only the NA GTIs came with DI, the ROW GTIs had dual DI/PFI, and a few NA guys did swap the PFI stuff onto their GTIs and reprogrammed the ECU to run it. Also took a custom subharness to connect the injectors to the ECU (where on the NA cars the pins were added to the empty connector positions).

The GTIs and many German DI cars had ridiculous carbon buildup. My exhaust always had thick, sticky, black residue on it, and pics of GTIs getting their valves blasted showed huge boogers of carbon buildup at shockingly low miles. Basically, by 30K miles your engine performance would be seriously impacted by carbon buildup.

I did look at Infiniti Q cars carbon buildup threads and pics online, and the pics of the VR30 carbon buildup seem significantly less severe than the German cars were (I saw "were" because I don't follow the latest German cars anymore). Although not ideal, it looks to me that carbon buildup in the VR30 is so much less than what I've seen before, I'd bet you could go quite a while before having a measurable negative impact on engine performance.

I don't understand why Nissan didn't employ some kind of strategy to deal with carbon buildup, it seems irresponsible for any manufacturer to continue using DI that worsens long term maintenance costs. Heck, our $20.7K 2020 Corolla with the 2.0 engine has dual injection D4S on it!

Magic Bus · 08-19-2021, 03:06 PM

Quote:

Originally Posted by takemorepills

I previously owned a 2016 GTI with DI. Only the NA GTIs came with DI, the ROW GTIs had dual DI/PFI, and a few NA guys did swap the PFI stuff onto their GTIs and reprogrammed the ECU to run it. Also took a custom subharness to connect the injectors to the ECU (where on the NA cars the pins were added to the empty connector positions).

The GTIs and many German DI cars had ridiculous carbon buildup. My exhaust always had thick, sticky, black residue on it, and pics of GTIs getting their valves blasted showed huge boogers of carbon buildup at shockingly low miles. Basically, by 30K miles your engine performance would be seriously impacted by carbon buildup.

I did look at Infiniti Q cars carbon buildup threads and pics online, and the pics of the VR30 carbon buildup seem significantly less severe than the German cars were (I saw "were" because I don't follow the latest German cars anymore). Although not ideal, it looks to me that carbon buildup in the VR30 is so much less than what I've seen before, I'd bet you could go quite a while before having a measurable negative impact on engine performance.

I don't understand why Nissan didn't employ some kind of strategy to deal with carbon buildup, it seems irresponsible for any manufacturer to continue using DI that worsens long term maintenance costs. Heck, our $20.7K 2020 Corolla with the 2.0 engine has dual injection D4S on it!

2 German car household here, GTI & M2. Couldn't keep that carbon build up off the GTI exhaust tips, despite washing the car every week to every other week. The M2, over 4 years in, exhaust tips 0 build up, same cleaning procedure as the GTI. However I've seen other M2's with owners who don't care, have build up on their's, but nowhere near my GTI!

Spooler · 08-19-2021, 09:39 AM

Quote:

Originally Posted by DrBacon

Without a doubt the VR is a much better engine platform, as soon as it becomes more widely accessible in the Z's more companies will invest in development for it. As I understand it the best built VR's are stuck in the 800whp range? I'd guess this will change soon enough now that there will be more demand.

My only real complaint about it is it's direct injection only, so either frequent walnut blasting is required or a good catch can setup early on.

It is an open deck block so I would suspect the VR30 will still have the same issues with sleeve walk and head lift as the VQ's.

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