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DIY 350zHR Intake Swap
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 http://www.the370z.com/members/megan...le-porting.jpg 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 http://www.the370z.com/members/megan...0090951000.jpg http://www.the370z.com/members/megan...0090958000.jpg http://www.the370z.com/members/megan...0091013000.jpg http://www.the370z.com/members/megan...0091023000.jpg http://www.the370z.com/members/megan...0091029000.jpg 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 http://www.the370z.com/members/megan...0091044000.jpg http://www.the370z.com/members/megan...0091522000.jpg =================================== 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 http://www.the370z.com/members/megan...0191834000.jpg http://www.the370z.com/members/megan...0191835000.jpg On the Left = 350z HR Intake & on the Right = 370z Intake http://www.the370z.com/members/megan...0191837000.jpg a view inside of the 370z Intake http://www.the370z.com/members/megan...0191837001.jpg a view inside of the 350z Intake http://www.the370z.com/members/megan...0191839000.jpg 350z HR Intake Installed (Fit test) http://www.the370z.com/members/megan...0191900000.jpg Some more grinding with a Dremel will be needed at the top of the Intake http://www.the370z.com/members/megan...0191900001.jpg Some more grinding with a Dremel will be needed at the top of the Intake http://www.the370z.com/members/megan...0191900002.jpg this one is Perfect http://www.the370z.com/members/megan...0191901000.jpg showing the back of the Intake http://www.the370z.com/members/megan...0191901001.jpg 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. http://www.the370z.com/members/megan...0191901002.jpg a closer look of the lower intake manifold http://www.the370z.com/members/megan...0191907000.jpg 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 http://www.the370z.com/members/megan...ure23418-a.jpg http://www.the370z.com/members/megan...ure23419-b.jpg ================================ 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 http://www.the370z.com/members/megan...1031946000.jpg 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 http://www.the370z.com/members/megan...0191839000.jpg the smooth process http://www.the370z.com/members/megan...1031236000.jpg http://www.the370z.com/members/megan...1031236001.jpg 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 http://www.the370z.com/members/megan...first-hole.jpg hole # 2 http://www.the370z.com/members/megan...econd-hole.jpg hole # 3 http://www.the370z.com/members/megan...le-perfect.jpg 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 http://www.the370z.com/members/megan...ill-unsure.jpg |
kept for a later update
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Props and reps for doing this and posting!
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how much did you find the 350 intake for?
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I got the intake at 100$ Can from a blown engine |
there is one for $150 on ebay
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oh and by the way , before someone ask about how I will replace the steel sleeve insert that I had to remove .
Don't worry about this because the solution to this problem is soo easy and not complicated, Stay around and you will know ! |
wow very interesting! good luck
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Chacal, this is pretty interesting!
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sorry for the noob question, but whats the benefit of this?
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http://www.the370z.com/intake-exhaus...-manifold.html What Ive been doing on my own is just something to save some money , get hand on experience , learning , challenging , trying to get better result ! the gain is mostly just in the mid-range and not really any gain past 7000rpm thats not a big deal because I am mostly between 4000-7000 at the track anyway and the gain range from 0+15hp/tq from the M370 (Motordyne) I'm only posting this here to show other peoples that are willing to take the same challenge as me , winter is coming quickly someone might be interested into a DIY !! |
wow nice work man! definatley in for updates
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great work!
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I did an update on the main post ( 3 Nov )
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Update 4 Nov
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 http://www.the370z.com/members/megan...1041853000.jpg Hole #2 http://www.the370z.com/members/megan...1041853001.jpg Hole #3 http://www.the370z.com/members/megan...1041853002.jpg Hole #4 http://www.the370z.com/members/megan...1041854001.jpg http://www.the370z.com/members/megan...1041855000.jpg |
Did you get it on, sealed up and running?
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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. |
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 ) http://www.the370z.com/members/megan...1151449000.jpg same one different view http://www.the370z.com/members/megan...1151449004.jpg testing with a washer http://www.the370z.com/members/megan...1231839000.jpg top view http://www.the370z.com/members/megan...1231844000.jpg Bolts used http://www.the370z.com/members/megan...1231847000.jpg Completed Unit !!!!!!! http://www.the370z.com/members/megan...1251942000.jpg |
Awesome. :tup:
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I'm anxious to see the out come of the dyno results.:tup:
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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?
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Great job! When are you dyno testing it?
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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 |
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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 http://www.the370z.com/members/megan...-no-reason.jpg |
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 . |
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.
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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 |
How did you get all the plastic dust and shavings out of the manifold? Air compressor? Shop vac?
I'm doing something similar and I noticed there are a lot of places where the little particles can hide and get sucked into the engine later. As you know, the the entire inside of the manifold is open and has little nooks and crannies everywhere. |
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you can also minimize the dust/particles going in by putting some towel in each runner |
Ah! I didn't think about water.
These manifolds are quite sloppy in their construction. Lips left over from the molding and sharp edges in the runners shouldn't be there. |
Megan, thanks for all the good info in these threads.
How plausible do you think it would be to split the stock VHR manifold open for modification? I'm very interested in modifying the internal geometry of the manifold, if I could just get it open to work on it. It looks like one solid piece of cast plastic, I don't understand how they could manufacture it that way... haha. Thanks! |
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