2009 Infiniti G37xS sedan

[dmuramoto]

Last week I traveled to Maryland to visit my wife's family. While there, I had a chance to drive a loaded G37xS sedan and found it quite impressive! Finished in moonlit white with a stone (grey) leather interior and washi -inspired aluminum trim, it was a nice looking car, inside and out. Options included Premium, Sport and Nav packages with rear spoiler and lighted kick plates for good measure. MSRP was north of $42K!

Possibly one of the best days was when I managed to go through parts of Virginia, Maryland and West Virginia to visit Summit Point Raceway and one of my racing friends. I got the busman's tour of all THREE circuits at this road racing facility. Seems the government does a lot of anti-terrorlst training there. The G37 was a pleasure to drive through the highways and byways, with spring rates and dampening tuned for comfort. The VQ37VHR ran effortlessly and averaged 28 MPG on the highway portion of the trip. The entertainment and nav systems were impressive, with my Ipod syncing up easily with the BOSE system and displaying songs/albums/artists, etc. on the central display. The nav system worked well, but ran into difficulty as I neared the rural sections where the map couldn't really identify the street names. Still, I got back and forth in easy enough fashion.

The seats in most Infinitis fit me easily enough, but I found the sports seats in the G37xS almost too good to be true. Supportive without being hard and with bolsters that held you firm without unduly hindering egress from the car. HVAC is almost flawless, with dual temp settings for a/c and happy co-existance with my co-pilot.

The steering is sharp and well weighted, like my Z car at home. Seven speed auto transmission has a firm feel at lockup and comes the closest to replicating the twin disc clutch setup feel of the R35 GT-R for any Nissan/Infiniti I've driven. I found myself looking forward to trips to DC and Pennsylvania just so I could drive to and from the events.

Alas, not everything is perfect. I wish the car had more rear seat footwell room as feet and knees can feel a bit confined. And an air conditioned drivers seat would be welcome news since Infiniti has access to that bit of technology. WHAT? Maybe I'm getting too self-indulgent here! Way back when, I could care less about having ANY a/c in a car.

In any case, the 2009 G37 really shows how Infiniti has refined an already great FM-platformed vehicle. Ever since I drove the first pre-production G35 sedans back in 2007, I've thought these are beautifully designed and built cars. With styling that still looks fresh and little improvements like scratch shield paint (which incidently, I didn't test, but appreciate its presence) the G37 line continues to lead the pack of near luxury vehicles!

[dmuramoto]

Any other G37 sedan drivers out there? Care to comment on this review or your own perceptions of the car?

[maxhopper]

I went to Chicago a couple weeks back to visit a friend. While I was there we test drove the G37xS and the M35x back to back. The M felt a lot more spacious than the G, but looking at the interior dimension specs there's not as big a difference as it appeared. I'm also not a fan of the center stack in the M. I defintely liked the additonal power of the G over the M. Both cars handled well on the twisties, but at the end of the day, I like the G more.

[dmuramoto]

Maxhopper97- We agree on the M's center stack; the wave-like styling just doesn't appeal to me. I'm surprised others feel differently (say something here, Nissan Sport Editor), but I thought it looked a bit dated. In comparing the two cars, the G is a direct competitor for the BMW 3-series and Audi A4 market, while the M takes on the BMW 5-series and larger Audi and MB sedans.

[SteveTheTech]

The G37S Sedan in both automatic and manual variants is hands down an amazing sedan. Acceleration with the 7 speed is pretty consistent with no evidence of hunting while maximizing torque output. The VVEL technology matted to the RE7R07a transmission is a classic combination that will make a huge impact on the future of the brand.

The addition of all wheel drive has improved many aspects of acceleration and handling as well as adding a piece of mind in inclement weather. Having watched the torque split on the computer it is amazingly seamless and the actual split rate is continuously variable as input signals change. The G37xS also has tires that are not only stylish but not staggered so the life of the tires can be drawn out evenly.

I find comparing the G and M in the means of technology not quite a fair comparison. There are so many options and with the new model of the G against the old model M the G is miles ahead. The BurrBrown audio converter and Drivers Audio Stage that were designed around this car add depth like no other mobile audio system I have ever heard. Where the new radio really shines is digital files using the hard drive, satellite, or MP3 files you can hear things that only truly top of the line setups can offer.The G uses smaller control buttons and multipurpose buttons. After a few days of driving them you can control almost all aspects of the climate control and audio visual features without taking your eyes off the road. On the other hand the 2006 M used large single purpose buttons oriented on a swooping line design. The same swooping line that the roofline shares, there are no hard corners from the drivers viewpoint. The voice control in the early Ms was the best that Infiniti has yet to use. The 07 and newer models do not use the same software. The 2006 model was designed to use voice control to change everything with the touch of a steering wheel mounted button. The design philosophy, market point and target demographic are different for each of these models. Although at this point in our history they are almost valued at the same point as dealers are eager to move anything and everything they have.

[dmuramoto]

^^^Very good technical comments on the G37x and I particularly like your observations on how the Infiniti AWD splits power delivery. Did you observe this on a 4WD dyno or CONSULT unit?

As for the differences between the G and M, it's clear the M is quite a ways upmarket from the G. I don't think the current M is a car we need at this point in our lives.

[SteveTheTech]

I was using a Consult III with a bunch of line graphs for various all wheel drive and engine parameters being monitored. It's pretty interesting that almost no two takes off look the same to the computer. Even on a daily commute something is always slightly different. Maybe that has to do with more finite measurements provided by the sensors, as well as better control of output devices. Gone are the days of counting oxygen sensor switching ratios and air fuel ratio sensors are actively monitored to the thousandth of a volt.

Since the M is due for a much anticipated makeover and with once again take its rightful position as the leader of the pack. I would love to see a new flagship for the level above the M that is still vacant since the ending of the Q45.

The FX50S is by far the upper echelon of technology available to us geeks out there.The car does not park itself but that is really just about the only thing it is lacking. Although there is some decent sticker shock associated with this particular model the options make up for it. All of the people myself included who have had the pleasure of driving one of these without a salesman present have thrown the adjective monstrous to describe the power and performance of this vehicle. Although it feels like it has been tamed down for the mass market maybe there will be an M50S.

I do see the VVEL making its way into all of their modern engines. With the ability to control intake camshaft lift and duration in addition to position timing makes the possibilities endless. The current fuel mapping is equally balanced for performance and increased economy although adaptable logic algorithms make allow the driving habits to learn your particular traits. I see many people complain about little issues within the first hundred or so miles and the issues tend to magically resolve themselves by the first oil change. However for optimal performance Nissan Ester Oil is highly recommended, from what I have seen it works very well and I strongly recommend it.

Today I had an opportunity to spend some quality time with a 2008 Lexus IS250 that had Nav and that seems like it was about it. Since I always keep an eye out for the competitors and this being the closest rival to the G37 sedan it seemed like a perfect opportunity to spy on what some people think Infiniti aspires to. One of the first things you notice when you step on the gas, even all the way it a lack of response. There is no exhaust or driveline noise no matter what spectrum of the power band the engine is in, very similar to a sewing machine. Also noticeable to anyone who has driven a real sport sedan is the distinct lack of torque thrust. Under normal operating conditions the IS offers a smooth numb driving experience very comfortable. Maybe it comes from my lack of experience with the interior and electronic features. I would really like to drive the 350 but I know just from the numbers that the overall experience isn't going to be completely different. The IS-F is a different creation altogether but I wonder if it still has lifeless steering?

I am awfully biased from years working on and owning many Nissans and Infinitis and logging some miles in pretty much everything on the road that wears the Infiniti logo. As they are all machines and have their weaknesses and strengths I feel that Nissan/Infiniti doesn't get a fair shake in the market. Then again driving something anything with a VQ is not for everyone.

[dmuramoto]

Well, more than a little time has passed since this thread got started and we are now the proud owners of a new '09 G37xS! I won't say too much, since the real details are contained in the Project G37 article in the upcoming issue of Nissan Sport Magazine.

But in case Steve the Tech is still reading this thread, I wonder if there are any updates to the VQ37VHR that I should be aware of. Also, does this VQ variation still use the ubiqitous 15208-9E000 oil filter?

[SteveTheTech]

That sounds like a very interesting project. This is already one of the faster sedans in a reasonable price point that is still naturally aspirated.

I am curious to see what your take on this car verses the 370z you wrote about a while back.

From a modification standpoint it seems like slim pickings. Any FI setup would be amazing in this car and the awd is surprisingly capable when pushed.

It sounds like you have a stock pile of the of old 9Es. The suffix is the same but I am not 100% on the prefix I will look into it.

A true test is where are your filters made?

As for updates to the VQ37VHR there may be a software update but that is it so far.

[audtatious]

Well, more than a little time has passed since this thread got started and we are now the proud owners of a new '09 G37xS! I won't say too much, since the real details are contained in the Project G37 article in the upcoming issue of Nissan Sport Magazine.

But in case Steve the Tech is still reading this thread, I wonder if there are any updates to the VQ37VHR that I should be aware of. Also, does this VQ variation still use the ubiqitous 15208-9E000 oil filter?

Congrats on the purchase, I look forward to the Project G37 article.

My wifes '07 G35s is the same body style and interior/electronics configuration as the new G37 sedan. I agree with you on rear seat foot well space as this car was a replacement for my 2002 Maxima SE which had tons of rear seat room. It is acceptable space for a mid-sized sedan. From a space perspective, the G is really no comparison to the M as the M is wider and has much more interior volume. Even though the G sedan is the same interior style as my G37 coupe I find it is harder for me to adjust to the G sedan from a seating position than the coupe. Not sure if the seat in the sedan is higher or what the difference is since the seats are the same, as is the dash configuration, there has to be some difference in the configuration that you can't see by eyeballin' it.

From a performance perspective, exhaust and intakes that are available for the '07-08 sedan should work fine on the '09. Cobb tuning and others also have products for ECU changes that will work with the 3.7.

[dmuramoto]

Thanks for the replies, guys. With some HUGE snowstorms out here in Colorado, it's interesting looking at the new G sitting in the garage next to my 350Z. Granted, the Z is lowered, but it looks to be 5-6" lower than the G37xS. Quite striking.

That contrast extends to the 370Z vs. the G37 sedan in general. The new Z is much further slanted to the performance side of the equation. It's lighter weight, lower center of gravity and firmer suspension settings make it the quicker car by a good margin. That's to be expected, but what's more surprising is how much more comfortable the G has become in everyday use. NVH, in particular, is much better better in the new G37.

As far as the differences in space between the G sedan and coupe, I'd say the difference in hip point placements for the two cars is more dramatic than it might seem. That simple design parameter makes such a huge difference in ergonomics. You sit lower in the G coupe and the wide range of seat adjustments allow my frame and build to settle right in. I'd agree that the G sedan is a bit tougher to find the ideal driving position, but it's not far off.

[audtatious]

You don't want to take the 370z out in the snow?

Lucky for me we don't have much snow during the year here so I have been able to keep the stock summer tires on the coupe (23k miles thus far). I did have to drive 100 miles through sleet in the coupe last winter and it actually did OK, which is surprising. I put Hankook Ventus V4's on the sedan so at least I can drive it in shallow snow if needed.

I'll have to do some measurements at some point in both cars to see if something is different. I'd really be interested to know if the seats are a different part number (they look the same), if the pedals are closer/further away with the seat all the way forward, and if the seat is higher/lower.

[dmuramoto]

Just in case Steve the Tech is still watching this thread, I've ordered up the oil filter that Infiniti specs for the G37. I'll compare it to the 15208-9E000 filter (that I have a supply of) and see if these's any difference. If not, my question becomes: if I use a non-spec OEM filter for an oil change, do I risk invalidating the Infiniti warranty?

[audtatious]

Infiniti won't give you a problem. I do use Infiniti for my G37 but use the 10-minute oil change place for the G35. As long as you get the oil changed in a timely manner and use a name-brand filther there won't be any warranty issue with the motor.

[dmuramoto]

Jeff- I'm sure you're right about the 'name brand' filters. But my question was directed towards using the older OEM spec 15208-9E000 filters that I've stockpiled for use on the VQ35DE and HR motors. I'd bet that Nissan/Infiniti just used a new cross reference number for the VQ37VHR oil filter, but wanted to be sure.

[audtatious]

Gotcha...and sounds about right for Nissan

Jeff is the city I live in

[SteveTheTech]

Dave,

The book calls for the 15208-65F0C but the 9E should work and has the crucial drainback valve that almost all aftermarket filters do not have. The filters are very similar in dimensions (the 9E is slightly longer) but the thread pitch and O-ring diameter are the same between the two.

Publicly I will fall in line with the company and its suggestion of 3750 (6,000 km) service intervals with the factory fill ester oil and a new crush washer. However if it were my car the schedule would be slightly modified.

As far as warranty goes what they really want to see is some sort of documentation that the service was regularly performed. If you buy in bulk keep the receipts for the supplies and if there is ever an issue they should cover you....although all dealers and issues are unique and what works at one may not work at another.

To anyone else who may read this or consider buying one of these very fun, well built vehicles consider the maintenance package offered through Infiniti. Even if you get outside financing the plan through Infiniti (not an outside company) actually covers ester oil (~$12/qt), air filters (~$20/ea x2) as well as a majority of factory recommended services. Although the plan replaces many things with no out of pocket cost the plan also pays for a myriad of inspections that (on almost all new cars) will never turn up a bad or failed part.

http://www.infinitiusa.com/own....html

As a tech I can tell you no matter what level of plan you have the majority of these things are inspected with a regular old oil change. Most of these things, even when bad, will pass a visual and touch and feel test but may make noise or complaints are going to steer us into the correct direction.

[dmuramoto]

Excellent and valuable stuff, Steve! My thanks and hopefully other Infiniti owners will thank you as well....

[dmuramoto]

Well, you'd think that being EIC means you'd have first say in publishing your own articles, but that's not the case. The introduction of Project G37xS will have to wait for the next issue, as my project car piece got put on the backburner for space reasons for the upcoming one. But that's OK, at least it's written and ready to go. And maybe, just maybe, I can get some artsy shot of it in an interesting locale to go with the article...

[audtatious]

Booooooo !!!!!

Focus on cheap performance upgrades that I can also use on my G37 coupe

[dmuramoto]

Audtatious- I hear you! It's disappointing, but a reality in publishing. The delay does provide some time to get to know and evaluate this project. The wintery weather here in Colorado has brought subzero temps and snowy roads. Combined, they make the G37xS feel like its got 600 HP on a skating rink filled with bumper cars! LOL

It's giving me ample time to consider what performance parts are available and which to consider. What kind of compromises do each one of these parts make and what is acceptable? With a car like this Infiniti, I don't want to lose any of the functionality or compromise the reliability of the vehicle.

[audtatious]

I doubt the Dunlop's will be that great in deep snow. What's interesting is during the MotorTrend test of the G37x they noted the AWD sedan had more of a tendency to hang the rear end out than the coupe. Might be what you are experiencing.

Performance wise it seems the Stillen long-tube intake is the best from a hp gain perspective. That assumes you want to cut out the air boxes for the tubes and deal with getting access to the filters for cleaning and replacement. Those, along with hi-flow cats seem to do pretty decent. Not sure about headers yet as I have not researched.

GT-spec has multiple chassis-braces available for the G37. Numerous companies have coilovers too. As long as you keep the non-staggered setup on the X it seems to handle suspension mods pretty well.

[dmuramoto]

Interestingly enough, the Dunlop Sport Maxx's have proven quite capable in the early snowstorms we've experienced here in Denver. I'm sure you're right about deep snow capability, but what all-season tire can really handle that anyway?

As for other mods, my concern is having to spend $400-700 on powertrain mods that bag a total of +5-7 HP, with perhaps another five coming with ECM tuning. That's not my idea of a low cost, high return type mod! Besides, the VQ37VHR makes more than adequate power currently and the seven speed flappy paddle gearbox keeps it in the powerband if needed. One area I'd like to examine is some low cost, high returns mods that could deliver better overall fuel mileage. Not as exciting, but certainly relevant for these times of rising fuel prices.

[audtatious]

Good luck. Seems there are really no low-cost mods for the Z/G with the VQ37 (at least yet). The Stillen intakes seem to be in the 10hp+ range and people have posted up some good drag times simply with that upgrade alone. Granted, I don't call $40-50/hp "cheap" either.

[dmuramoto]

For the first post of 2010, I'd like to update my experience with Project G37xS. We've had a steady stream of snowstorms here in Denver and despite 8-10" snowfalls, the Infiniti seems to get through quite easily. In contrast, Project 350Z can't even make it out of the driveway easily! Admittedly, the Bridgestone Potenza RE050s are a max performance summer tire, but it's the combination of freezing temps and snow that really do it in.

The ATTESA-ETS system works well and allows just enough RWD drivability to get underway without feeling like there's a lot of switching going on. Steve the Tech has mentioned watching the myriad of changes that happen every second on a dyno run with a similar car and this system has certainly made me a believer.

Disengaging VDC on an empty parking lot allowed me to play with the car on my makeshift skidpad. Power drifts on snow and ice are easily attained and held. The G37xS feels like a RWD vehicle with extra traction. Countersteering into the slide and recovering to accelerate in a straight line demonstrated how well balanced the G is. I had a great time, but had to stop before the local constable inquired about my unauthorized vehicle dynamics research.

[dmuramoto]

What's an update worth without a pic of Project G37xS? Here's a shot when the weather was warmer:

[audtatious]

No snow yet for me to play around in with either car. The coupe is delegated to sleep in the driveway on days with snow threat due to the RE050a's. I'm sure I will find out soon enough with the RWD sedan

[dmuramoto]

No snow yet for me to play around in with either car. The coupe is delegated to sleep in the driveway on days with snow threat due to the RE050a's. I'm sure I will find out soon enough with the RWD sedan

Enjoy those warm and sunny days out east. You must be in the only geographical location that didn't get hit with a big dump of snow. A recent satellite shot of the continental U.S. indicated 67% of the country is covered by snowfall- a much higher percentage than in years past.

Back to the G37S and G37xS sedans: sure wish I had the larger monoblock calipers and brake rotors that the RWD models came with. The brakes on the G37xS are adequate, but I'm sure there'll be times I want more heat sink capability.

[audtatious]

All the areas around us got snow but right where I live it simply rotated rain. I was disappointed....

There is a big difference in braking between the G37s and the G35s which has the standard Nissan/Infiniti brakes. Maybe you should look into an upgrade? I've seen G37s brakes on ebay recently for a couple grand.

[dmuramoto]

The last weeks has finally seen our last big snowstorm melt away. The G37xS made it through everything without any problems. I've been looking at BBKs for the G37, but haven't seen any at a reasonable price. My goal would be a significant brake upgrade for around $1K. At that price point, I think it'll hold some interest to a broad range of subscribers.