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Custom Gtr Drag Plenum ** Pics Inside**

JDMfantasy

By JDMfantasy,
in Engines & Forced Induction

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JCMarshall_Law Proficient

JCMarshall_Law

Posted
Posted

Looks like a nice job.

Are there flutes on the intake runners (inside the plenum)? Just thought flutes would be a worthwile addition, prolly help smooth the flow into the runners and may help with top end power.

discopotato03 Grand Master

discopotato03

Posted
Posted

If I had the time/resources/interest to develop such a thing it would have two plenums 123-456 fed by two throttle valves . I believe it would stand a much better chance of even distribution over each set of three cylinders and halve the reversion problems . The 153624 order would draw from front back front back etc plenums . Engines such as the four cam twin plenum VG30 do it a bit like that though if memory serves me correctly they have a throttled balance pipe as well . The Porsche flat sixes have had separate plenums from the beginning . Difficult to package on a straight six Skyline but sometimes these things work . Nissan dualled everything else on the RB26 except the plenum and intercooler so who's will be the first ?

Cheers A .

JDMfantasy Explorer

JDMfantasy

Posted
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I would not build a manifold based on looks. It is a large capacity plenum with large runners and TB because a ton of air is being moved through it. The runners are 51mm ID, and they taper down to the stock flange (this speeds up air vel.) which will be port matched to the ported head. The opening of each runner is radiused out to from 2" to 3.5" for max flow and smooth transition. This is not going on a street car.

Not sure if you're serious about the welds, but they're all sanded out. None are visible.

Our MA70 supra came with the 7M-GTE 3.0 turbo. We swapped it out in favor of the 1UZ.

r33_racer Grand Master

r33_racer

Posted
Posted

You do realise that sanding welds smooth takes away a good portion of its strength? That material looks about 10-12mm thick in most places, you could have mig welded the whole thing, except where you welded the runners to the flange i guess you prob tig'd them on. or did youz tig the whole thing together??

JDMfantasy Explorer

JDMfantasy

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Tig'd both inside and out. Same material and technique used on our fire truck parts (rated over 500 psi)

You do realise that sanding welds smooth takes away a good portion of its strength?  That material looks about 10-12mm thick in most places, you could have mig welded the whole thing, except where you welded the runners to the flange i guess you prob tig'd them on.  or did youz tig the whole thing together??

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