Plenum Spacer mod for 2009

nope. 09 35 is the HR engine. It has a completely different upper and lower intake manifold design. I believe they fixed that front three cylinders not getting enough air issue with the HR revision thus minimized the gains you'd have from a spacer..
 
With the 09 FX35 I think they also started using a dual exhaust system so it looks like it's as efficient as it gets right now. I think the best mods you'd do would be on the mufflers. There might be more mods coming up for it if they use the same engine in the upcoming Z but so far there isn't any..
 
EG3 said:
With the 09 FX35 I think they also started using a dual exhaust system so it looks like it's as efficient as it gets right now. I think the best mods you'd do would be on the mufflers. There might be more mods coming up for it if they use the same engine in the upcoming Z but so far there isn't any..
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i thought the HR is already in Z's, the "rev-up" engine?
 
StuLax18 said:
i thought the HR is already in Z's, the "rev-up" engine?
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yeah it is in the 06 or 07+ Z's, I was somehow thinking the new Z would have the HR too but it looks like it'll have the HR engine at the G37. Basically, the only cars on the Nissan/Infiniti lineup using HR will be EX35, FX35 and the now-old Z.
 
I appreciate all the comments and links to other threads about the topic and the HR engine. I'm still learning about these engines as I've never had a Japan car so there will more dump questions. Now if you want to talk small block chevys or 454 Rat's I'm your guy, but for now looks like this old dog is having to learn new tricks. I'll say this the engine in our 35 has more power and torque than a lot of V8's I've driven and owned. The engineering in this engine really impressed me and frankly was one of the deciding factors in making the purchase. I drove the Lexus, Acura, and the Infiniti last. Had I driven the 35 first I wouldn't have driven the other two, becasue there is no contest IMHO. So be kind when you see my questions I'll be learning for a while, I'll get better when I can get my hands on the service manual.
Bill
 
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CloseEncounters said:
Hope Im not being a thread hijacker but I wanted to know what the benifits are on installing the plenum spacer? Is it offered for the FX35?
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Fill out your ride information in your profile. If you have a 2008 and below 35 there are spacers available. Here is more information on spacers https://www.infinitiscene.com/search/1/?q=tags.php?tag=spacer

Basically what a spacer does is increase the volume of air towards the front cylinders by increasing the height of the upper plenum. Normally the front cylinders have a slight restriction due to the downward sloping of our upper plenum's.
 
EG3 said:
nope. 09 35 is the HR engine. It has a completely different upper and lower intake manifold design. I believe they fixed that front three cylinders not getting enough air issue with the HR revision thus minimized the gains you'd have from a spacer..
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Did the revison increase air volume so we wouldnt need the spacer? or did the revision inhibit us from putting a spacer?
RACER-X
 
RACER-X said:
Did the revison increase air volume so we wouldnt need the spacer? or did the revision inhibit us from putting a spacer?
RACER-X
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Both. In the previous design, the forward incline on the upper plenum prevented the front two cylinder runners (inlets) to get much less air. Plenum spacer allowed more air in there while also increasing the overall air volume for more higher end power. In the new design, the upper plenum is flatter and I believe both the runners and the heads have a better flowing design. Aside from all this, HR is a very new engine and it has just been offered to the Z community, which is the core of all the modding.. In time we'll see if there might be any improvements on it but currently the only mods are cold air intakes and custom exhausts.. There are some aftermarket exhausts for the g37 but I don't know if that'll fit fine with the FX
 
There are enough mods for the HR that I would have expected someone to have made a spacer by now if it was needed. They have been on Z's for a couple years now, and they have TT kits, along with some really advanced intakes.
 
EG3 said:
Both. In the previous design, the forward incline on the upper plenum prevented the front two cylinder runners (inlets) to get much less air. Plenum spacer allowed more air in there while also increasing the overall air volume for more higher end power. In the new design, the upper plenum is flatter and I believe both the runners and the heads have a better flowing design. Aside from all this, HR is a very new engine and it has just been offered to the Z community, which is the core of all the modding.. In time we'll see if there might be any improvements on it but currently the only mods are cold air intakes and custom exhausts.. There are some aftermarket exhausts for the g37 but I don't know if that'll fit fine with the FX
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Didnt know the 2nd gen. had a new engine. Im glad I found this site. Thanx for the info.
RACER-X
 
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