Plazmaman Plenem Vs Greddy

[neo32]

i meant on a neo in r32 woundering about clearances etc

[frozenwaffles]

Plazmaman all the way. i have one on my 25. workmanship is beyond belief!

guys are fantastic to deal with and very helpful.

standard throttle body bolts straight on if thats the one you want.

more room in the engine bay because of this...easier to fabricate the cooler piping.

its just better so buy it...and its WAY cheaper than original greddy. its about $1000, greddy is like $1700...

oh and copies of the greddy are just a waste of time...

[TiTAN]

my greddy was about $1000 where are you getting the $1700 price tag?

[r33_racer]

Weve run both on our race car with identical setups as a back to back comp. Done at mercury a good 2-3 years ago now. We picked up a good couple hundred rpm in the midrange and more power with not much change in the top end. Currently run the plasmaman plenum, though I do have a greddy on my raod car.

[MercuryMotorsport]

dont underestimate the greddy. I have egt sensors in my exhaust manifold and the tuner was very impressed with the evenness of the temperatures across the cylinder range. That tells me I am getting a good even fuel distribution across all 6 pots.

This is in no way a slight at the Plazmaman product, it may well do the same but i aint changing to find out.

No one is doubting the even-ness in flow of either product, hell that is why I have a HYPERTUNE plenum on my r34 gtr. The engineering and design of there (hypertune) plenum's mean there is only a 0.5% difference from the highest to the lowest runner. (I can't remember exactly where that number came from, but I am pretty sure the lad's at Hypertune told me that when I was looking at my options).

The single biggest factor when deciding between these 2 plenums (plazmaman and Greddy) is the loss of midrange torque due to the short runner on the Greddy, and the second is SPACE. The Plazmaman sits up higher the whole way along and as such becomes unsuitable for some installations (such as RB25's into s13's, rb20's into old school Capri's etc). Sometimes it is a little more headache with the Plazmaman because of this, but we try every possible solution before throwing on a Greddy. We have even used R33 runners/PM tops on R34 engines as they sit in different locations (we did this on the VC commodore with NEO RB25 conversion).

[FineLine]

No one is doubting the even-ness in flow of either product, hell that is why I have a HYPERTUNE plenum on my r34 gtr. The engineering and design of there (hypertune) plenum's mean there is only a 0.5% difference from the highest to the lowest runner. (I can't remember exactly where that number came from, but I am pretty sure the lad's at Hypertune told me that when I was looking at my options).

The single biggest factor when deciding between these 2 plenums (plazmaman and Greddy) is the loss of midrange torque due to the short runner on the Greddy, and the second is SPACE. The Plazmaman sits up higher the whole way along and as such becomes unsuitable for some installations (such as RB25's into s13's, rb20's into old school Capri's etc). Sometimes it is a little more headache with the Plazmaman because of this, but we try every possible solution before throwing on a Greddy. We have even used R33 runners/PM tops on R34 engines as they sit in different locations (we did this on the VC commodore with NEO RB25 conversion).

The loss of midrange is an easy fix, I have istalled a 40 mil plenum spacer made by mace engineering to add runner length. it also has the added advantage of reducing intake temp.

With the engine running hard on track i can put my hand on the plenum. A couple of minutes of heat soak after the engine is switched off tho and its too hot to touch,

Both obviously good products, use what you prefer.

[juggernaut1]

OK slightly off topic...but onthe topic of the Hypertune plenum.....Trent have you done any back to back testing of the Hypertune vs stock on the black top SR's?

[MercuryMotorsport]

OK slightly off topic...but onthe topic of the Hypertune plenum.....Trent have you done any back to back testing of the Hypertune vs stock on the black top SR's?

Unfortunately not. We used to do plenty of SR20 work a few years ago, but since that time the large majority has been RB's and 2J's. We still do SR's but not to the same extent or quantity that we used to. Hypertune introduced their plenum after this time, so I haven't really had a customer request to do it, so we haven't. I really want to build a street/drag car to take out the under 2.4L radial record, but am a bit preoccupied with the workshop and our r34. If I find the right client and he wants to test this sort of stuff, then yes I would love to see how they compare. I dare say it would be a similar situation in that the shorter runners creates less torque in the mid range, later spool, but good outright power.

[juggernaut1]

Thanks

[MercuryMotorsport]

any one done a plazmaman plenum into a neo rb25

and what about one in a r32

Its something that you will have to try in your engine bay because it in a different engine bay, but there should be a combination of runners and tops that will work with your car. We fitted a neo 25 into a VC commodore and we ran into problems with the large brake booster taking up a big chunk of area near the firewall/plenum. What we noticed was that the r34 runners extend further away from the engine and the plenum sat further away to suit so that it was fouling on the booster. Luckily we had another gtst in the workshop with a plazmaman setup on it, so we test fitted that and it turned out it was about 10-15mm closer to the engine and it was just enough to clear the booster. So we bought a second hand set of r33 runners and swaped the r34 plenum with an r33 one from Plazmaman. It took lots longer to install, but there was a solution.

[XRATED]

The loss of midrange is an easy fix, I have istalled a 40 mil plenum spacer made by mace engineering to add runner length. it also has the added advantage of reducing intake temp.

With the engine running hard on track i can put my hand on the plenum. A couple of minutes of heat soak after the engine is switched off tho and its too hot to touch,

Both obviously good products, use what you prefer.

Do you have any pics of the 40mm phenolic spacer?

Cheers

Justin

[sky30]

Its something that you will have to try in your engine bay because it in a different engine bay, but there should be a combination of runners and tops that will work with your car. We fitted a neo 25 into a VC commodore and we ran into problems with the large brake booster taking up a big chunk of area near the firewall/plenum. What we noticed was that the r34 runners extend further away from the engine and the plenum sat further away to suit so that it was fouling on the booster. Luckily we had another gtst in the workshop with a plazmaman setup on it, so we test fitted that and it turned out it was about 10-15mm closer to the engine and it was just enough to clear the booster. So we bought a second hand set of r33 runners and swaped the r34 plenum with an r33 one from Plazmaman. It took lots longer to install, but there was a solution.

Have you done back to back on a gtr the hypetune rb26 plenum vs stock gtr one?

What the difference?

Edited April 8, 2010 by sky30

[.WILKO.]

I just installed my plazmaman pro series kit, I know your asking for a vs greddy plenum but I had stock plenum with a greddy retun flow cooler. After the install I gained maybe 10rwkw, but added a shit load more response. As I'm running a gt3076 it was slighty laggy with old setup but now I've seen a 500rpm+ boost pick up. And +1 on the workmanship!!! Being the proseries kit I got also got the billet thottle body, and pre fab'd piping, I found it was easier relocating battery to the boot.. Maybe something you don't need to do with greddy??? And let's not forget plazmaman is very exy!!

[Guilt-Toy]

has anyone tried to remove the knock sensors on a rb25 with the greddy manifold attatched?

I gave up. With the plazmaman plenum its doable without too much fuss

[2rismo]

Does anyone here have closer pics of the Plasmaman plenum , I'd like to see where the fittings and IAC assembly goes .

Here's mine.

[frozenwaffles]

Ahhhh it really is a work of engineering art! Far more spectacular than the greddy in every sense of the word!

[PM-R33]

God those throttles are gorgeous, gotta get around to getting one, would finish mine off nicely me thinks. I see that they have slighlty changed the plenum with "Plazmaman" not being engraved on the top but now on the bottom.

Edited April 11, 2010 by PM-R33

[2rismo]

[N1GTR]

Do you have any pics of the 40mm phenolic spacer?

Cheers

Justin

I'd like to see these aswel, esspecially if the stock rb26 plenum can accomodate them (I'd guess it's a simple fit and some basic pipework), more torque is always welcome here

[discopotato03]

Just to confirm , did someone mention you can use the std R33 throttle cable with this plenum ?

Also one for Mercury , I don't suppose its possible to use the GTt runners and PM plenum on an R33 ?

Would there be any gain or just lots of grief for no real purpose .

Lastly , WHAT is the size of the R33 std throttle plate ? PM site shows a 66mm throttlebody as their smallest offering so whats the difference between this and the std R33 25DET throttle plate size ?

Cheers Adrian .