VQ35DE Intake/Plenum Port
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- Опубліковано 3 жов 2024
- How To Port Your VQ35DE Intake
Hey guys here's another video on the VQ intake from my 350z, this time we're porting the intake to remove the casting marks and pitting on the inside of the intake manifold and plenum to allow for better airflow to the head.
From what I could find in the forums most people say that the heads on the VQ35DE is not that restrictive which is why I only ported the intakes.
This job was very cheap as it only requires the tooling and A LOT of time and patience. However the job itself was not overly difficult and I would recommend to anyone considering doing this as its a good chance to familiarise yourself with your engine.
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I did a lot of the same work on my intake system. I really focused on making that 90 degree bend in the upper plenum as smooth as possible. I worked my way up to like 3000 grit wet sand. Great info here!
That’s awesome I’ve heard the choke point on stock manifolds is that 90deg bend, some people have even cut it off and refabricated a bigger and smoother corner🤙🏻
@@ReubsModifications Spot on - it a big choke point on the DE.
Love your work. You have given me inspiration to give this a go.
Thanks mate. You should definitely do it, not much to it but time.
I literally just bought this and the rev up middle collector to port over the winter break. Giving myself something to do
It is a bit tedious, good to use a spare one as you can take as long as you want and still keep your car on the road 👍🏻
How was your power after the port? Plenum is definitely recommended but the lower manifold will reduce velocity if the diameter is opened up past just a polish. I definitely regret porting my manifold on my HR as I lost a good 10ft/p of torque throughout torque band except for right up top it picked up maybe 5-10ft/p so definitely less powerful overall. Just a tad more power at redline. I recommend port matching the manifold but blend to normal diameter by half way down at the latest. Then just sand the casting from there down. Loosing velocity means loosing volumetric efficiency and therefore loosing power especially under 5k rpm. opening the diameter in the lower runners does not give you more air, just less velocity.
I only picked up about 2kw at peak so not much at all
It’s already designed well from the factory. You wouldn’t buy a 30,000$ Trombone and port it.
Bout to do the lower runners on that lower collector
Let me know how this goes
Did you port match the heads? Intake to head is the most important part of port matching. Port matching was started years ago carburetor-intake port,intake-head.
I didn’t match the heads, I found a few forums that said there isn’t much gain from doing the heads 👍🏻
Good idea this. Any idea on power gains from it? Not expecting anything much but could be handy especially when I get to installing ITB's
I got a retune afterwards and power gains were minimal, the restriction of the intake is the elbow at the throttle body. Going ITBs will get rid of that restriction so you should see far better gains than what I got 👍🏻
Can you post the first tool used on the die grinder please
First one looks like a carbide burr, should be able to find these at most tool shops just make sure you find the right sized shank for your die grinder 👍
Wouldn't you want the intake surface to be a bit rough to help with fuel atomization? I thought polishing was only for exhaust porting...
that is one concept, the other is better airflow i think both are fair points. I did get minor performance gain after retuning however.
@@ReubsModifications that's true. I believe however that since the VQ is a multi pojnt fuel injected engine, air and fuel get mixed in the intake manifold and it would benefit from some extra atomization, where as a direct injection engine would benefit more from polishing and flow since air and fuel only really meet in the combustion chamber. I guess we'd have to see a comparison to really tell witch concept works best for the VQ
@@Sam_Missile yeah that’s a very good point, you would have to compare both side by side to be able to see the difference. I think it would be a very minor difference and would probably vary throughout the RPM 👍🏻
Post injection benitfits from rough surface as with direct injection benitfits from port and polish as the fuel is added after the manifold. DE benefits from less turbulence and more velocity from port and polish.
What tool is the Arba? I can’t seem to find it online
They're rotary sanding pads. They come in a few sizes I think I was using 2 inch pads in various materials. You can get sanding discs in different grit and scotch bright pads. Try searching rotary tool sanding disk. Here's a link I found to one but it doesn't include sanding disks
www.ebay.com.au/itm/304555859766?chn=ps&_ul=AU&_trkparms=ispr%3D1&amdata=enc%3A1nRNVXt9AQ5CxdcgJm6Z-Wg53&norover=1&mkevt=1&mkrid=705-166974-041499-5&mkcid=2&mkscid=101&itemid=304555859766&targetid=1742491917535&device=c&mktype=pla&googleloc=9069172&poi=&campaignid=19903037956&mkgroupid=147124481666&rlsatarget=pla-1742491917535&abcId=9308386&merchantid=7364522&gclid=Cj0KCQjw3a2iBhCFARIsAD4jQB3K9LNjBuuVCi5EAoslEXmlZdGxRVPsJO2-8yM2NVkCIgJbmiILkewaArTQEALw_wcB.
So how was the out come? More power?
Idle difference adjustment?
Was it worth it?
Gain of HP approximately 5 +/- .
Would like to hear the positives if you can.
Thank you for your detailed video was definitely entertaining.
Considering the cost was very low I'd say its worth it if you have the time to do it yourself. I gained some mid range torque and gained 3kw at the wheels for peak power. The tune was required after the porting as the idle was all over the place.
@@ReubsModifications
what happened to idle?
@@инвесторвничего caused the idle to hunt and bounce around, would idle up and down between 750 and 3000
I'm about to work on one, I don't think I should port the bottom of the manifold just the inside and the top of the lower plenum and pretty much the whole upper plenum, did u have any issues afterward?
It did change the idle slightly but I was getting the car retuned soon after so that was corrected. The car was still drivable but had a high idle which became annoying 👍🏻
@@ReubsModifications Are you certain the idle came from the port and not the throttle body being moved?
@@crebiiGG it could have been the throttle body but I did the throttle reset multiple times and it didn’t fix it
@@ReubsModifications heard heard. just checking cuz i plan on doing this! thanks for the info
@@crebiiGG no worries mate 🤙🏻
What kind of grit are you using?
Varying grits from 40 up to 240ish 👍🏻
Oh ok, did you also port the intake inlets on the heads? Or it doesn't matter?
@@TjRebel I asked a few people with better knowledge on the engine than myself and they said that there isn’t much benefit in porting the head🤙🏻
Can I get a "Crikey Mate!"
I’ll try to sneak one into one of my next videos 😂
@@ReubsModifications You just earned yourself a new Subscriber!
Hahaha thanks mate
Rename this how to garuntee engine failure. You will leak. It will cause combustion issues.
No leaks yet but feel free to share more info on this 👍🏻
Why tf does she look and sound like that creepy asf 💀
Trying to recite what I told her to say😂