DIY 350zHR Intake Swap by Megan370z

Then after I got my eyes on some picture provided in the Motordyne thread

I had a pretty good idea where the hole was 

it took about 50-60mins doing the 4 holes with a drill and Dremel

unfortunately the 4th hole was a bit complicated to do since from the picture that I took from the Motordyne thread , the picture was blurry and not clear .

But I was certain where the hole was .I decided to go ahead and do it anyway

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Tonight , I went at the car club on base (military) and proceed to a fit test , I knew I wouldn't be dead on about those hole , I was right.

No big deal just some details

On the Left = 350z HR Intake & on the Right = 370z Intake

a view inside of the 370z Intake

a view inside of the 350z Intake

350z HR Intake Installed (Fit test)

Some more grinding with a Dremel will be needed at the top of the Intake

Some more grinding with a Dremel will be needed at the top of the Intake

this one is Perfect

showing the back of the Intake 

the most feared hole

the new hole I made is right on , but at an angle , which mean I will have 

to grind the top of the intake a little bit and a longer bolt to help with the fitting , no big deal.

a closer look of the lower intake manifold

the 4th hole that I'm having some difficulty is about 13/32 inch closer to the front of the car . 

the other possibility was to drill & tap a new hole where the OEM hole in the 350zHR intake would be on the lower manifold

which is shown on this picture

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I am not finish and I'm just doing it during my free time and when I have nothing to do.

the reason to have got both the intake manifold and 2x Throttle body is because I'm going to have both TB bored to 62.5mm and some other trick

then a custom CAI and a bigger MAF section.

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Update 3 Nov 2010

well tonight Ive been doing some work on the intake, 

more importantly was to smooth down the runners after I sanded the sharp edge that was originally there

the finish is quite smooth ! which might not be noticed on this picture

then the second work on the intake was to sand and smooth down the entry where the Throttle body bolt on.

there is some restricting edge that can be seen on this picture

sorry its a Cell picture

the smooth process

then last work was to open up the 4 holes that has been worked on previously and after the *test fit* from 2 week ago

hole # 1

hole # 2

hole # 3

hole # 4 , this is the one that I'm having some doubt , I'm pretty sure I will have to adjust the alignment to have the bolt in correctly

I'm suppose to be testing it again tomorrow if nothing change

Hole #1

Hole #2

Hole #3

Hole #4

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 !!!!!!!

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

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

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