DIY 350zHR Intake Swap

Xan

Did you get it on, sealed up and running?

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Megan370z

not really because I have to get some more work done on the last hole ( Hole #4 )
once the alignment is correct and the screw in .
I'll be able to get on the next step of filling the hole to be able to hold down the intake manifold.

the sealing is not a problem , the last hole is.
you just have to look at the picture and you can have a pretty good idea of what I'm talking about.

Megan370z

another Update before going on the Dyno to find the result !

I finally put myself back into it and after 4 try , I finally got to screw into the 4th hole that was giving me a hard time !
I was afraid of making a hole by grinding into the wall since the screw is right touching it !

so yeah everything is done and ready *hose included*

total time spend on the project 10-11 hours
I could easily cut the time by more than half of what it took me now ! hehe
since having to install and remove the intake manifold pretty much took half of the time.


the 4th hole ( hardest one )


same one different view


testing with a washer


top view


Bolts used


Completed Unit !!!!!!!

m4a1mustang

Awesome.

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Baer383

I'm anxious to see the out come of the dyno results.

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2013 ZL1

754 rwhp 747 rwtq

pokeyl

Are the runners longer in the 350/m370 intake or the total volume larger? is the right side feeding only the 3 cylinders amd the same for the left?

ClemsonWill

Great job! When are you dyno testing it?

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Megan370z

It was planned for this week but the guy that borrowed the dyno got an accident and is not able to bring the dyno back , its gonna have to wait till next week

Megan370z

the 350zHR/M370 does have longer runner than the 370zvhr manifold

as for the size , the runner entry of the 350zHR/M370 seem bigger than the 370zvhr and also the curved lip is more suited in the 350zHR for the runner size

from my very limited experience and what I have read on the M370 from MotorDyne.
The 350HR manifold should be superior (haven't been on the dyno myself yet) on the VQ37 platform


Volume ? I have no idea ! I haven't tested it but should be very close to each other.

Air Feeding , well there is 6 runner in the Intake manifold and 3 of each side is positioned toward the Throttle entry ,, the rear and middle runner have more of an direct air pickup than the front one.
There isn't a wall separation from the left to right , the air is free to move everywhere

kevin8086

sub

pokeyl

I have a manufacturing background and it looks like you could punch a larger hole centered on the new bolt location and Epoxy in some nylon dowels, with the bolt hole on the center and under-cut in the middle. If you dyno proves out. I'll see if you could make up a kit or something.

Megan370z

Ok here are the Update !

right now , we are scratching our head . We tested both Intake manifold and everything fit perfectly.
Only one problem

with both Intake manifold we ran into a problem
The ECU is pulling around 6-8 ignition timing at the top end
after looking to the datalog and after many pull the result were the same for both intake manifold regardless , both pulled timing

we tried different map that always worked last summer and from about 2 months ago *last time on dyno*
I had 1 relatively stock timing (+2 timing) with around 13.0-13.2AFR and still pulled timing on top
We tried our big Map with aggressive timing that was installed this summer ,,
the same result happened
we tried back a light advance timing map with richen AFR
still nothing ,, the ECU always pulled heavy timing on the top end

we looked at the VVEL system to see if the problem came from there ,,
we saw no sign of any problem , everything goes up(VVEL voltage) and Timing gets down.


so we have 2 possibility
1= something is vibrating somewhere that trigger the knock sensor
2= bad winter 91 fuel from Petro Canada which was the Sunoco station few week ago , for those that doesn't know . Sunoco provided us with a good fuel and access to a 94octane .

so I'm leaving it as it is and I will just not rev pass 6500 RPM until i get back on the dyno ( January/February ) oversize Throttle body + oversize MAF + custom CAI

Megan370z

I updated the picture link from this DIY because the file where the picture were located was changed ?!?!

as for an update on this modification well we found out the problem I had the last time I went on the dyno to see the result .
It was was about some very bad winter gas .

since then well I got my new whole intake system redone and I'm going to be tuning it to get ready to go back on the dyno by the end of January .

nitrousfedman

How did the intake swap work out for you. I have found a stillin supercharger for a 370z, for a good price thinking about buying and trying the same thing. How did the finished product work out for you.

Megan370z

im still using it and havent got any problem

we discorvred the reason about the big dip at the top end ,,
it was the result of a bad cracked flywheel that was making the knock sensor unhappy and then they were pulling timing badly..

since the repair ,, that drop fo 40whp never came back

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