Greddy Plenum Spacer Info (Torque/midrange)

[BlackBox]

Does anybody have feedback on the mace engineering manifold spacers? They are made from insulating material so may keep temp down too.. If you are searching for performance I dont think you will feel a difference after switching to the plazmaman (I didn't) but don't regret it because of the difference it makes in the engine bay. I can't comment on the greddy, but even spaced I don't think it would either

[GTSBoy]

Phenolic spacers have a good reputation for making lower inlet manifold temperatures on many engines. If you're going to make/buy a spacer, it might as well be thermally insulating.

[skylineking]

Does anybody have feedback on the mace engineering manifold spacers? They are made from insulating material so may keep temp down too.. If you are searching for performance I dont think you will feel a difference after switching to the plazmaman (I didn't) but don't regret it because of the difference it makes in the engine bay. I can't comment on the greddy, but even spaced I don't think it would either

That would be good to know if anyone has used the mace engineering ones, I'm interested cause u can use those spacers with any plenum u decide to run as long as it's not that thick I don't think u would need to modify anything.

I gather u went from stock to plazmaman & didn't feel any gains..... Ive currently got the greddy & that's what started this whole thread, would it make much of a difference midrange torque/lag wise to run a spacer & would it pose any problems..... I know some guys have done it unfortunately none of them have commented (maybe they haven't read this or no longer active members).

I love the look for the greddy but now I am willing to switch to less pretty (in my opinion) plazmaman if there is noticable midrange gains to be had & so far that seems to be a resounding yes from everyone.

I had an r33 rb25 (rest well my faithful motor u will be back one day) but for now I'm buying a 25neo & not sure wether to do just Pistons & headgasket (maybe oil pump as I have billet gears sitting here) & put that back in (trying to keep costs down)!! Of course also doing the plazmaman plenum change over from the greddy & I'll see what the results look like I know it's not exactly a great comparison but it's better than nothing

[wildeagle44]

Thanks wildeagle44, how many mm's do you think the spacer could be before you would have space/fittment issues?

From memory 10-12 before you hit the fuse box.

[MrFijiGold]

I was very lucky to get a plazmaman plenum, TB, piping & bov at a very good price for my neo. I also have a 6boost mani ready - just need a turbo. Cant go wrong with plazmaman I reckon.

[skylineking]

From memory 10-12 before you hit the fuse box.

I'm guessing that would be in a R34? That wouldn't make bugger all difference to the midrange. In a R33 you might have a bit more room but I think even at best 40mm wouldn't make much of a difference From what my mechanic says.

Seems like the plazmaman plenum is the best option out of the forward facing plenums! I need a bargain like Mrfijigold seems to have landed!

I might be selling my hks 3037s but we'll see ?

After I fit my Neo if I end up using the same turbo then I'll post my old dyno run vs my new. I know it's not a fair comparison but it's something. My old setup was an R33 rb25 with a greddy plenum my new setup (If i don't change turbos) will be a Neo with a plazmaman...... I'll post updates as they happen in the mean time anymore input on the original topics is appreciated ?

[Ben C34]

I suppose a way of estimating gains based on runner length would be to look at cars or motorbikes which have variable length runners. Then you could tell If 6 mm or so is worthwhile. Im.guessing it's not, in order to get a decent gain it would be in the order of 100 mm

Looking forward to seeing how would go with the neo.

[jet_r31]

6mm will do sweet f**kall...

cheers

darren

[Ben C34]

Except make someone some money!

[GTSBoy]

100mm is the correct order of magnitude to make noticeable changes. When adding trumpets onto ITBs or sidedraught carbies, you're talking about 50-150mm trumpets, and not being able to buttdyno tell the difference between say, 50 and 75mm. The real dyno might show you some numerical difference, and the car might be measurably faster/slower as a result, but the butt really couldn't tell.

[skylineking]

Unfortunately our engine bays don't accomodate 100mm ? so it looks like the spacer idea for midrange is not a good thing to consider!

I'm thinking a thin spacer from mace engineering for heat soak purposes with a plazmaman plenum is a win win ?

Thinking I'll paint my plazmaman plenum same colour as my cam covers but I'm wondering wether I should paint the factory runners also or just have them cleaned up.......?

[BlackBox]

I am about to remove my plazmaman anyway and considering installing a mace spacer, but is it possible it might make the runners 'too long' and have some negative implications? Or did you decide an extra 6mm even on the standard runners wouldn't be enough for the 'bum dyno'

[GTSBoy]

6mm = utterly unnoticable, probably even on a real dyno

[skylineking]

I am about to remove my plazmaman anyway and considering installing a mace spacer, but is it possible it might make the runners 'too long' and have some negative implications? Or did you decide an extra 6mm even on the standard runners wouldn't be enough for the 'bum dyno'

6mm wouldn't make any difference in a bad or good way really it's too small to change the characteristic of an engine but the heat soak benefits would be worth while I would think.... ? definitely let us know how u go!

[MrFijiGold]

There is a RIPS plenum in the FS section. Any thoughts in that?

Not sure if its for Neo or not tough..

[skylineking]

All those style of plenums aren't the best for midrange torque or for better spool that's why I'm making the swap from greddy to plazmaman.... It's the design in the short runners that makes them like that.

if it's made for r33 rb25 it would fit on a neo without too much hassle! ??

[skylineking]

Bump, still hoping that someone who has done the spacer mod on a greddy can comment to give people info if they decide to go down that path ?

[BlackBox]

And I'm hoping somebody can comment on any intake temp changes using the mace insulating spacer

[skylineking]

And I'm hoping somebody can comment on any intake temp changes using the mace insulating spacer

I think you & me need a megaphone or something lol! Definitely people out there who've done these mods probably just haven't been on in a while or not reading this topic...... Hhhhmmmmm *scratches non existent beard*

[Ryno]

And I'm hoping somebody can comment on any intake temp changes using the mace insulating spacer

I use a phenolic intake gasket on the inlet manfold for my RB25DET. My inlet plenum uses the standard lower runners with a MX Performance plenum top (similar to a Plazmaman manifold).

I don't beleive the intake temp changes would be very significant, as the coolant runs through the inlet manifold. This will heat up the inlet manifold to what ever temperature the coolant is at. Conversly if you were running a standard gasket, the plenum may be a touch warmer, but the coolant will then do the opposite and try to bring the temperature of the inlet manifold down to the level of the coolant. So there's probably only a few degrees in it either way.

I would have preferred to use a phenolic gasket between the lower runners and the plenum top (provided it could seal correctly) however I wasn't able to find anyone who makes them.