The 2013 Infiniti Lineup: Charting the Changes

FX-R

like I've been saying for years.... they need to make a limited production of FX's where they basically take everything out of the compartment of a GT-R and drop it into a FX... make only 500 of these. Priced accordingly.... (not that I have the money for it :sidefrown: )
 
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mpohio said:
I am more than happy with the 3.5 in my 2010. I really don't need any more power(no I am not that old), as it would just get me into more trouble. What I would have liked is more MPG. That seems to be the main place Our FX line is lagging in compared to the competition. A lot of the Comp has gone to turbos and diesel engines to squeeze out more MPG. Plus I like the tried and true, time tested 3.5L . Of course I may be a little biased since I just recently purchased my FX35 :tongue:
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It's coming in the next few years. With Nissan/Renault's partnership with Mercedes I'm sure it will happen much further down in the in future.
 
I agree. The 3.5L has been around and it seems to have fewer issues. Would I love another 22hp? Sure, but that's hardly much difference in a 4300 pound vehicle. I imagine the EX37 will be a total sleeper, though!

My co-worker has a Q5 with the 2.0T. It's not nearly as responsive at lower RPMs as my FX35 but it does get slightly better gas mileage (20-22 mixed loop). Power requires fuel and air...there is now way around that.
 
Are people seriously trying to find ways in thinking their 3.5L is a better choice than the 3.7L? Given a choice between the 3.5 or the 3.7 I highly doubt the 3.5 would be the engine of choice. Lets all face it, the FX is not very practical. It leans more towards the sporty side (ie. performance)

kfscoll said:
Grrrr...me too! I bought my 2012 FX35 in mid-May and scoured the Internet beforehand trying to learn whether the 3.7L motor was coming to the FX. Given the 2012 refresh, I didn't see this coming. Oh well--the performance boost shouldn't be too noticeable due to the negligible change in torque (although the 3.7L's torque curve is supposed to be "wider and flatter"). I kind-of figured that upgrades in the 3.7L mainly benefitted NVH and fuel economy. I was just hoping that my car would be the "latest and greatest" for more than two months.

Regarding the exhaust, I had an '07 G35 coupe and currently have an '11 G37x sedan. IMHO the G35's exhaust sounded waaaaay better than my G37's does (although I realize I'm comparing coupe to sedan and across different generations). Still, there's no guarantee that the FX37's exhaust will sound better (or even significantly different) than the FX35's does.
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Wider and flatter in the lower range so that helps with city driving, engine doesn't have to rev as high. The coupes always has a nicer exhaust noise than their sedan counterparts. I had coupe exhaust parts on my sedan cause the sedans sounds bland. Exhaust noises can be manipulated just like how the FX45 can be made to sound like the FX35 in the 1st gen
 
Tangerine said:
Wider and flatter in the lower range so that helps with city driving, engine doesn't have to rev as high. The coupes always has a nicer exhaust noise than their sedan counterparts. I had coupe exhaust parts on my sedan cause the sedans sounds bland. Exhaust noises can be manipulated just like how the FX45 can be made to sound like the FX35 in the 1st gen
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Gotcha -- I understand the implication of "wider and flatter" but I've never been able to find an actual plot of the VQ35HR's torque curve vs. the VQ37VHR's curve. I've also never seen "wider and flatter" quantified so we really don't know how much wider and flatter. I think I read something that said the 3.7's torque curve was "up to 15% greater" but that doesn't tell us very much since we don't know where in the rev band that 15% occurs or over what portion of the band there's an actual difference.

I also read that the extra weight of the 3.7L negates its power gain (saw this in a comparison between the '08 G35 sedan and the '09 G37 sedan) but I have no idea whether that's actually true.

The bottom line is that of course I'd rather have the 3.7L given the choice but since I'm now stuck with the 3.5L I'm trying to ease the pain by telling myself there's not that much of a difference. :-) I guess no one will really know for sure until the new FX37 has been tested and compared to the FX35!
 
kfscoll said:
Grrrr...me too! I bought my 2012 FX35 in mid-May and scoured the Internet beforehand trying to learn whether the 3.7L motor was coming to the FX. Given the 2012 refresh, I didn't see this coming. Oh well--the performance boost shouldn't be too noticeable due to the negligible change in torque (although the 3.7L's torque curve is supposed to be "wider and flatter"). I kind-of figured that upgrades in the 3.7L mainly benefitted NVH and fuel economy. I was just hoping that my car would be the "latest and greatest" for more than two months.

Regarding the exhaust, I had an '07 G35 coupe and currently have an '11 G37x sedan. IMHO the G35's exhaust sounded waaaaay better than my G37's does (although I realize I'm comparing coupe to sedan and across different generations). Still, there's no guarantee that the FX37's exhaust will sound better (or even significantly different) than the FX35's does.
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I've always felt that way about the 1st gen G's vs the 2nd gen's.
Same goes the FX's.
 
I don't know what you mean about the VQ37VHR having better NVH that than VQ35HR we have right now. That 2012 G37 I had was noisy especially on cold starts the engine would sound like a diesel engine (same complaints on myg37.com).The VQ35HR by comparison is a lot quieter. The 3.7 also has annoying ticks from the VVEL.

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By the way even after the TSB fix for that annoying sound it never really corrected it fully.
 
Fire0nic3FX said:
I don't know what you mean about the VQ37VHR having better NVH that than VQ35HR we have right now. That 2012 G37 I had was noisy especially on cold starts the engine would sound like a diesel engine (same complaints on myg37.com).The VQ35HR by comparison is a lot quieter. The 3.7 also has annoying ticks from the VVEL.

---------- Post Merged at 12:45 AM ---------- Previous Post was at 12:42 AM ----------

By the way even after the TSB fix for that annoying sound it never really corrected it fully.
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I should've clarified. I've read that one of the goals of the VQ37VHR was to reduce NVH relative to the VQ35HR. However, my experience has been the same as yours -- the 3.5 seems noticeably quieter and smoother than the 3.7. FWIW I've owned the VQ37VHR in an '09 370Z and an '11 G37x sedan, the VQ35DE in an '07 G35 coupe and an '08 Altima sedan, and the VQ35HR in my FX35. In all cases my experience has been that the 3.5 was smoother and quieter than the 3.7, so in my earlier post I was simply regurgitating claims I'd read about the 3.7 and NVH, not my personal experience.

BTW what did you do with your '12 G37?
 
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Fire0nic3FX said:
I don't know what you mean about the VQ37VHR having better NVH that than VQ35HR we have right now. That 2012 G37 I had was noisy especially on cold starts the engine would sound like a diesel engine (same complaints on myg37.com).The VQ35HR by comparison is a lot quieter. The 3.7 also has annoying ticks from the VVEL.

---------- Post Merged at 12:45 AM ---------- Previous Post was at 12:42 AM ----------

By the way even after the TSB fix for that annoying sound it never really corrected it fully.
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The VQ37 is new while the VQ35HR has had enough time to be refined. The VQ35 isn't exactly problem free from the beginning.

The 2 TSB have fixed a lot of complaints from G37 and 370Z forums.

kfscoll said:
Gotcha -- I understand the implication of "wider and flatter" but I've never been able to find an actual plot of the VQ35HR's torque curve vs. the VQ37VHR's curve. I've also never seen "wider and flatter" quantified so we really don't know how much wider and flatter. I think I read something that said the 3.7's torque curve was "up to 15% greater" but that doesn't tell us very much since we don't know where in the rev band that 15% occurs or over what portion of the band there's an actual difference.

I also read that the extra weight of the 3.7L negates its power gain (saw this in a comparison between the '08 G35 sedan and the '09 G37 sedan) but I have no idea whether that's actually true.

The bottom line is that of course I'd rather have the 3.7L given the choice but since I'm now stuck with the 3.5L I'm trying to ease the pain by telling myself there's not that much of a difference. :-) I guess no one will really know for sure until the new FX37 has been tested and compared to the FX35!
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The 2008 G35 sedan has the older 5 speed automatic while the 2009 G37 has the new 7 speed automatic, that is one contributing factor. Wasn't able to find the weight difference but maybe someone has that info to share?

Here are some dyno graphs of VQ35HR and VQ37, too bad I wasn't able to find one comparing both engines

Stock VQ37

NewStock370ZDynoBaseline.jpg

Stock VQ35HR

435756258_9ekSt-XL.jpg

Some more here http://www.g37-tech.com/wiki/VQ37VHR

I can see about what you mean about the bottom line and don't get me wrong I have a 35 but I want a 37 but at this point I don't need to find any "justification" for my purpose. I'm guess I'm the type of guy that has the mentality it is what it is and if I want it badly I would do it
 
Tangerine said:
The VQ37 is new while the VQ35HR has had enough time to be refined. The VQ35 isn't exactly problem free from the beginning.

The 2 TSB have fixed a lot of complaints from G37 and 370Z forums.
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It has nothing to do with having time to be refined. The noise from the VQ37VHR is just the life of the engine nothing you can do about it. Nissan has had 6 going on almost 7 years already to fix it. Obviously this noise is normal. While the TSB has fixed a part of the noise it sure as hell as did not completely fixed it. The VVEL tech is noisy and Nissan's only fix for it was to use their $150 Ester oil which I find ridiculous. I've driven like 5 G37's over the past years and they were all 2011-2012 models which already had the TSB issue addressed since it was a late build and they still tick and sound like a diesel engine on cold starts. So to me nothing has really been fixed.

Oh and all G37's are filled with the ester oil from the factory. Doesn't seem like it actually works.
 
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Tangerine said:
I can see about what you mean about the bottom line and don't get me wrong I have a 35 but I want a 37 but at this point I don't need to find any "justification" for my purpose. I'm guess I'm the type of guy that has the mentality it is what it is and if I want it badly I would do it
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I'm 100% with you. The difference between the two motors is certainly not at all worth trying to replace an FX35 with an FX37. I'm just pissed that I wasn't able to find any evidence anywhere that the 3.7 would be used in the FX in 2013 -- and I certainly searched. In fact, I'd convinced myself that Infiniti was going to stick with the 3.5 in the US since they're still using it in the JX35 (although AFAIK that's the VQ35DE) and they'd had plenty of time to switch the EX/FX to the 3.5 if they were going to do it.

Oh well, as you say, it is what it is. I'm over it now.
 
i remember driving them both loaners g35 08 and g37 09-11 and all i can say g37 was faster. My friend and i actually got loaners on our way i gunned the car and my friend was 3 cars head. Im like wtf is wrong with mine (then i noticed 5 speed tranny+g35 emblem in the rear). I was jealous that he had the g37 so that said i would prefer 3.7l motor even on a fx.

I loved the sound the g37 made on a cold start up, its sounded tough! lol
 
kfscoll said:
I'm 100% with you. The difference between the two motors is certainly not at all worth trying to replace an FX35 with an FX37. I'm just pissed that I wasn't able to find any evidence anywhere that the 3.7 would be used in the FX in 2013 -- and I certainly searched. In fact, I'd convinced myself that Infiniti was going to stick with the 3.5 in the US since they're still using it in the JX35 (although AFAIK that's the VQ35DE) and they'd had plenty of time to switch the EX/FX to the 3.5 if they were going to do it.

Oh well, as you say, it is what it is. I'm over it now.
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Same page, to me it isn't worth it to upgrade to the FX37 now. But maybe down the road if something was to happen to my car or if I need a replacement the FX37 would be on my list.

Fire0nic3FX said:
It has nothing to do with having time to be refined. The noise from the VQ37VHR is just the life of the engine nothing you can do about it. Nissan has had 6 going on almost 7 years already to fix it. Obviously this noise is normal. While the TSB has fixed a part of the noise it sure as hell as did not completely fixed it. The VVEL tech is noisy and Nissan's only fix for it was to use their $150 Ester oil which I find ridiculous. I've driven like 5 G37's over the past years and they were all 2011-2012 models which already had the TSB issue addressed since it was a late build and they still tick and sound like a diesel engine on cold starts. So to me nothing has really been fixed.

Oh and all G37's are filled with the ester oil from the factory. Doesn't seem like it actually works.
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VVEL system also helps with emission reduction and when does a car produce the most emission? You guessed it, cold starts. Maybe Nissan/Infiniti see the VQ37 on its way out and decided to stop supporting it, who knows. But then again I daily drive an RX hybrid so any other car has a lot of NVH in comparison.
 
Saw the 2013 FX37 LE at the Dealers today. Looked real good in the white with the graphite 21" wheels, graphite roof rails, smoked headlights etc. Salesman asked if I wanted to take it out butI declined. it did look great though.
 
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