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Greddy Style Plenum Problem

Akis

By Akis,
in Engines & Forced Induction

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Akis Collaborator

Akis

Posted
Posted

As i was installing the plenum today, a problem came up, i have a R34 GTT, so i bought the AAC from a R33, a Q45 TB, and went to install them, BUT, i can't find nowhere what to do with the line that comes from the back of the valley cover(the one behind the cam gears), i believe that water runs through it but i am not sure what to do with it... Please someone help me...

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https://www.sau.com.au/forums/topic/281861-greddy-style-plenum-problem/
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zebra Grand Master

zebra

Posted
Posted

Is it the water feed for the turbo?

if so, on the back of the thermostat housing is another outlet, that normally runs into the coolant bleeder than into the intake, then to the turbo (on an r33) I assume its the same for the NEO 6. so that turbo feed line will need to be Tee'd into there (depending on what you have done with the coolant bleed screw)

Pics will help

Akis Collaborator

Akis

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Posted

I saw somewere this:

th_untitled245445.jpg

It is this line that i am saying(but on a Rb25det NEO)

In this thread it says it is a vaccum line somewhere... that you disconect when you install rb26 cam covers..

http://www.skylinesaustralia.com/forums/Rb...tt-t243185.html

Akis Collaborator

Akis

Posted
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Posted

So this was a vacuum line going to the power steering.. found it today..

Now i have another problem the R33 ACC is very different to the one of R34, the one has 2 connectors and the R34 one connector..

Please somebody who knows...

Akis Collaborator

Akis

Posted
  • Author
Posted
So this was a vacuum line going to the power steering.. found it today..

Now i have another problem the R33 ACC is very different to the one of R34, the one has 2 connectors and the R34 one connector..

Please somebody who knows...

Somebody please help me with the idle valves...

  • 3 years later...
gtsttrk Mentor

gtsttrk

Posted
Posted

Has anyonw done back to backs with the greddy/freddy plenum?

Im considering one for my drift car but havet tested one myself

I'm pretty certain that there's a thread on FF plenums and several of the guys went backwards running one. The thread did center on the plazmaman iirc but doubt there'd be any difference. I'll see if I can dig the thread up and post it back here.

Frosty Grand Master

Frosty

Posted
Posted

Has anyonw done back to backs with the greddy/freddy plenum?

Im considering one for my drift car but havet tested one myself

curious in results if you end up testing back to back....i thought about changing from my plazmaman due to the size but worried about lack of HP! i know the plazma will make power but not sure a greddy or copy would

GTSBoy Grand Master

GTSBoy

Posted
Posted

The consensus is that the Greddy style ones will cost a (non RB26) RB low-mid torque and response in exchange for an increase in the top end that probably isn't worth it. The Plazmaman ones suffer a little less at the bottom end because they retain the longer original lower runners and also provide some increase at the top end.

The only real value is in being able to clear the top of the engine and run shorter intercooler piping - not that the shorter piping actually has that much effect, beyond placebo anyway.

Anyway, as has been said above, this has been thrashed to death in its own thread.

DVS JEZ Grand Master

DVS JEZ

Posted
Posted

Thanks guys i will have a search for the thread now.

And sorry if my question wasnt clear i meant a back to back between standard plenum and freddy/greddy.

Thanks GTSBoy, thats my thoughts exactly due to runner length.

ARTZ Grand Master

ARTZ

Posted
Posted

yeah, if you are aiming for high rev/boost/power setup its probably a good upgrade..though I have read of issues with leaning out on certain cylinders...the rear i think it was, I dont recall any "Factual evidence"

I think where they failed is people were slapping them on streeters thinking it was a huge upgrade but in reality it was pointless, with the only benefit being easier plug changes.. :rofl:...If its on high rev track car it probably wont do any harm...question is will it do any good on your specific setup...

Way i see it alot of big power setups use them so they cant be all bad...But on your drifter Jez (if thats what its for)...probably not worth the effort as you might gain a little up top and may lose low range torque and response..robbing Peter to pay Paul so to speak...

I bought one for my car but when I looked into it benefits (or lack thereof) and the effort involved in swapping it over , I sold it again

However if I had a huge turbo and planned to run 2 bar through it I would be more inclined put one on...

ARTZ Grand Master

ARTZ

Posted
Posted

probably better to buy a blank plenum hat and start from scratch then...chop up stock manifold weld on tubes and hat...isnt that what hypertune do :unsure:

but what are you trying to acheive with it Jez, more power, better response...??

personally I think if you want more power just get the bigger turbo, (read t67 :P) throw a freddy on and crank up the boost...

if you want better "driveability" your time/money might be better spent adapting rb26 TBs.,, ...

GTSBoy Grand Master

GTSBoy

Posted
Posted (edited)

Jez,

Ramtubes in plenums are so completely overrated that I wouldn't bother. It is absolutely true that if you have a nice big fat plenum with simple holes into the runners that almost any ramtube will improve the flow rate into each runner. It is also true that you can choose the best ramtube (that would be the design that is rolled over so that you have a 1/2 donut shape lying on the floor of the plenum around each runner inlet) to maximise the benefit. But what is a major stumbling block is that it is not possible to make a nice big fat plenum to house these things in. The real world plenum on an inline 6 is constricted by the brake and/or clutch master cylinders and any other obstacles on that side of the engine. As such the side wall of the plenum opposite the inlet runners is already closer to the runners than you would like, and so sticking bellmouths up into the plenum space just steals from the room available for the air to make the turn into the runner.

It gets worse. 6 trumpets all in a row. All the air has to flow past all the trumpets to get to the last one. There will be wakes and eddies after each trumpet sticking up that affect the flow into the next one. Ramtubes only work well when you can get the air to flow towards each one of them as if it was the only one in the world. if you stick them in a row in a long plenum, then you have to start trying to fix the problems that they cause to each other (by other flow treatments inside the plenum) in order to get back to where you were before you had trumpets. Not worth the hassle.

If it were me, I would just the absolute minimum, which would be to either have a generous radius machined into the baseplate of the plenum where each runner starts, or put the half donut style bellmouths around each one. That last design would be, for say a 40-50mm runner diameter, probably mean that the donut would be maybe 15mm section thickness and therefore stand about 7.5mm proud of the baseplate. Would look a lot like this http://www.velocityf.../10950_WEBS.jpg with the back edge hard up against the baseplate. I'd remove the excess material from the back edge so that there was no parallel section, just radius.

Edited by GTSBoy
ARTZ Grand Master

ARTZ

Posted
Posted

have you seen the custom plenum made to address all the issues you mentioned...some guy did it and theres a thread on it, not sure if it was on this forum but its a crazy piece of work...I doubt the effort was worth it though...lets face it on a 30 yr old motor just about everything that can be done has been done....your really got to be pushing to find a newer/ better way...

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