DIY 350zHR Intake Swap by Megan370z

By diyauto
( 1 )

DIY 350zHR Intake Swap


Compliments of Megan370z @ www.the370z.com


https://www.facebook.com/pages/One-Man-Team-Motorsport/479326642201444?fref=ts


10-19-2010


Ok here I am after reading about the M370 from Motordyne

I decided to try myself at doing something similar and see if something else could provide about the same result or better .


so I began looking for the whole Intake and TB assembly used which I found a great deal .


I took a look at the lower spacer that Nissan glue/fit under the intake and found out there was on 3 of exit hole a big restricting lip from not fitting the spacer and the intake together.

I began to sand it and make a smooth joint

it took about 90 Min's doing them all 6


Picture below is during the sanding



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




===================================


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




================================


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.


=============================

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



11-4-2010


As planned, I went back at the car club to work on the intake *Test fit # 2*


3 of the 4 holes are completed and ready for the next step .

My guess on the dreaded hole was confirmed again , it just need a little more work to be able to install the long screw (M8x1,25), as for the 3 other one , they will still use the OEM screw (10mm socket head)


I have done no more than 6 hours total on this DIY

it take about 50 mins to swap the intake manifold which was done twice.


Hole #1



Hole #2



Hole #3



Hole #4





11-25-2010


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 !!!!!!!




11-30-2010


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



12-7-2010


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


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


Macintosh HD:Users:nickbalistreri:Desktop:user11263_pic25225_1291772276.jpg


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