Early stages of HR/VHR intake manifold dyno testing.
09-07-2007, 07:27 AM
#21
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Originally Posted by __jb
This sounds very interesting from an engineering and performance point of view.
I have never heard of a variable geometry intake manifold before. Do any currently exist?
Will the intake actually have moving pieces? I'm trying to visualize how this will work and am very curious, but I don't want to expose any of your secrets.
My guess is that manifold vacuum/pressure will somehow cause the runners to expand or contract???
I have never heard of a variable geometry intake manifold before. Do any currently exist?
Will the intake actually have moving pieces? I'm trying to visualize how this will work and am very curious, but I don't want to expose any of your secrets.
My guess is that manifold vacuum/pressure will somehow cause the runners to expand or contract???
09-09-2007, 11:02 AM
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Originally Posted by godmans
Correct me if I am wrong, but the intake manifold of current BMW's v8s all have variable geometry to give a very broad power band.
09-09-2007, 11:34 AM
#23
OK Guys,
I gave it a shot. Unfortunatly Nissan didn't want me (or anybody else) to do this test...
Although the bolt hole patterns of the manifolds "look" the same, they are not exactly the same.
Apparently Nissan doesn't want people swapping plenums around like we did with the revup and non-revup engines.
The bolt pattern of the G37 VHR plenum is slightly offset from the 350Z HR plenum. Only 4 of 8 bolt holes lined up so it couldn't be bolted down securely enough to make a reasonable seal.
After looking at the bolt holes more closely, its apparent that they didn't "need" to change the pattern, but apparently they did it for the sole purpose of preventing VHR/HR manifold swaps.
What a bummer.
I gave it a shot. Unfortunatly Nissan didn't want me (or anybody else) to do this test...
Although the bolt hole patterns of the manifolds "look" the same, they are not exactly the same.
Apparently Nissan doesn't want people swapping plenums around like we did with the revup and non-revup engines.
The bolt pattern of the G37 VHR plenum is slightly offset from the 350Z HR plenum. Only 4 of 8 bolt holes lined up so it couldn't be bolted down securely enough to make a reasonable seal.
After looking at the bolt holes more closely, its apparent that they didn't "need" to change the pattern, but apparently they did it for the sole purpose of preventing VHR/HR manifold swaps.
What a bummer.
09-09-2007, 11:46 AM
#24
I can try again another day but it will take special accomodations to make it seal.
BUT THERE IS GOOD NEWS TO REPORT!
The front upper lid of the 350Z plenum is dished slightly (like a kinetix plastic plenum).
This is to allow more clearance for the strut bar.
The good news is the G37 manifold.... Its also slightly dished on the top front.
Although the G37 doesn't have a strut bar, the VHR manifold is clearly designed to accomdate one!
Nissan wouldn't waste time designing a manifold to accomodate a strut bar unless they intended to use it with one.
BUT THERE IS GOOD NEWS TO REPORT!
The front upper lid of the 350Z plenum is dished slightly (like a kinetix plastic plenum).
This is to allow more clearance for the strut bar.
The good news is the G37 manifold.... Its also slightly dished on the top front.
Although the G37 doesn't have a strut bar, the VHR manifold is clearly designed to accomdate one!
Nissan wouldn't waste time designing a manifold to accomodate a strut bar unless they intended to use it with one.
09-09-2007, 11:54 AM
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Originally Posted by Hydrazine
I can try again another day but it will take special accomodations to make it seal.
BUT THERE IS GOOD NEWS TO REPORT!
The front upper lid of the 350Z plenum is dished slightly (like a kinetix plastic plenum).
This is to allow more clearance for the strut bar.
The good news is the G37 manifold.... Its also slightly dished on the top front.
Although the G37 doesn't have a strut bar, the VHR manifold is clearly designed to accomdate one!
Nissan wouldn't waste time designing a manifold to accomodate a strut bar unless they intended to use it with one.
BUT THERE IS GOOD NEWS TO REPORT!
The front upper lid of the 350Z plenum is dished slightly (like a kinetix plastic plenum).
This is to allow more clearance for the strut bar.
The good news is the G37 manifold.... Its also slightly dished on the top front.
Although the G37 doesn't have a strut bar, the VHR manifold is clearly designed to accomdate one!
Nissan wouldn't waste time designing a manifold to accomodate a strut bar unless they intended to use it with one.
09-09-2007, 12:45 PM
#26
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Any chance you could heli-arc the existing holes that don't line up and re-drill them?
It might not be cost-effective long term, but it would help you determine if it was a direction worth pursuing.
It might not be cost-effective long term, but it would help you determine if it was a direction worth pursuing.
09-09-2007, 08:12 PM
#28
Originally Posted by __jb
Any chance you could heli-arc the existing holes that don't line up and re-drill them?
It might not be cost-effective long term, but it would help you determine if it was a direction worth pursuing.
It might not be cost-effective long term, but it would help you determine if it was a direction worth pursuing.
I can probably make it work long enough for a dyno test with a little ghetto modding.
It will take time though.
09-10-2007, 04:32 AM
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Originally Posted by Hydrazine
Can't put heat anywhere near that plenum... Its 97% plastic.
I can probably make it work long enough for a dyno test with a little ghetto modding.
It will take time though.
I can probably make it work long enough for a dyno test with a little ghetto modding.
It will take time though.
09-10-2007, 05:40 AM
#30
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Originally Posted by 97supratt
I really do not understand why Nissan has such a hard time with consumers testing/swapping products.
If they didn't want us doing this then they shouldn't have put a HR motor in the G37.
If they didn't want us doing this then they shouldn't have put a HR motor in the G37.
09-10-2007, 06:13 AM
#32
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My murano has a daul stage intake on it. It is a DE engine But if you are looking to make a daul runner intake with a vacum operated valves that will open up a shorter path runner then there is no reason to reinvent the wheel. Just thought that you might be able to use it as a design platform. The lack of two TB can be solved by adding another opening to the other end of the plenum section. Down side is that it is rather tall.
09-10-2007, 06:28 AM
#33
Originally Posted by Sharif@Forged
I just ordered a new HR manifold, and it was about $260....FYI. In fact..Tony...if you have any use for it, I can loan it to you.
09-10-2007, 06:30 AM
#34
Originally Posted by WalkerT
My murano has a daul stage intake on it. It is a DE engine But if you are looking to make a daul runner intake with a vacum operated valves that will open up a shorter path runner then there is no reason to reinvent the wheel. Just thought that you might be able to use it as a design platform. The lack of two TB can be solved by adding another opening to the other end of the plenum section. Down side is that it is rather tall.
I'll check this out.
09-10-2007, 08:39 AM
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Originally Posted by WalkerT
Has anyone takin pictures of the both of them (hr35/hr37) split open? To see how they are designed or how they might be improved?
09-12-2007, 02:42 PM
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Originally Posted by jimmyloose
IIRC yamaha uses a similar system on the more recent sportbikes they've been building...
There it is...
There it is...
