Rb20det Plenum

[Justin O]

Hey guys tried to do a search but couldnt come up with anything.

Im looking at getting a JUN plenum for my rb20.

I was just wondering if the rb25 plenum would bolt on to my rb20?

Any info would be great.

Thanks

[andylaurel]

im lead to beleive that the Rb25 flange wont bolt to the RB20 head.

perhaps you should go to Autobarn and get a Greddy plenum off the shelf for RB20

[Dahtone Racing]

since when do Greddy make an RB20 plenum?

[RB20/30Det_VL]

hey mate

speak to ISLEEP on this forum or see his work on the www.calaisturbo.com.au forum under advertisers

i just gave him some rb20det runners that i had lying around, he did one for me which i was very happy with, he is a good bloke too

he sells them for about $800-$900 very good quality

if u want send ur email address to me n ill send u some pics

cheers,

brad

note: also that one in my avartar is an old one!

Edited January 6, 2007 by RB20/30Det_VL

[Wheezy]

RB25DET ones from a R33 dont work....different ports IIRC and verry different water lines etc, and more.

Greddy dont do one, used to a long time ago (i think)

Jun copies can be had from japan for cheaper than what calais turbo dudes were making.......stryder ones from thailand are available but look fair average....

The jun copies pop up now and then on ebay

[Justin O]

Thanks for the input guys.

RB20/30Det_VL - pm sent.

Wheezy - cheers, Ill look into it.

[rev210]

Plazmans units are pretty good.

These look ok as well. Shorter runner length than using the factory bottom half. Works out to around $700 inc frieght.

http://cgi.ebay.com/ebaymotors/RB20-DET-In...7QQcmdZViewItem

Edited January 6, 2007 by rev210

[RB20JT]

ey what are the benefits of a plenum? is it worth the $800?

[rev210]

on an Rb20 the plenum gets you shorter intercooler pipework for improved response and with shorter runners and larger volume chamber with bell mouths you improve top end power capabillities.

[R31Nismoid]

ey what are the benefits of a plenum? is it worth the $800?

well ive seen RB20's well into the 200rwkw range with stock plenum.

So its your call if you think its worthwhile... personally... i'd spend the money on cams or something else.

[RB20JT]

im assuming with plenum..then ur reducing ur over temperatures under the bonnet yer? thats a good thing...response yer...but is it worth $800?

[Justin O]

Im running a high mount.

Dont really want my engine bay so cluttered.

Rather have my cooler pipping shorter as well.

[rev210]

The plazman units have been tested to deliver 15rwkw peak power improvement over standard on just a stock turbo application. So thats 15rwkw you can't get with the same setup on the factory plenum. Peak power is however the least important fact and almost not worth looking at. The average power increased significantly. Plus the bonus is better response off boost which the Rb20 so desperately needs.

I'm considering one myself because I can't get away from the fact that it's a good idea every way you look at it (if you have a front mount like I do) and not really that expensive once you have decided not to exceed a level of power but, you are chasing more average power.

Average power is king you see. Sure you can get to 200rwkw with or without one (then again the plenum is probably always going to be 15rwkw or more higher) but, with the higher average power this ought to give you, a car equiped with one will smash one without in any gear and in any enviroment. It simply will out accellerate it period. Or if you want to cap the power at 200rwkw you can achieve this with less boost.

I'm not suggesting you don't look closely at the dollar value on performance return (it's worth getting as much info from the manufacturer to back up the claim) but, peak power means bugger all by itself.

my 2c

[limpus]

Has anyone tried the new rolin intake plenums available through driftbitz.com?

[Wheezy]

Those stryder plenums are rubbish, Ive seen them in australia. Welds could be done better by a shop kid in high school. There are better examples out there.

They have short runners therefore (correct me if im wrong) less responsive down low and a larger tank so it will actually decrease response. But as the average rb20 intercooler piping is vastly reduced in length it will even out and probably work better.

[rev210]

From memory, the longish runner length on efi applications usually is to do with pulse interference at low engine speeds causing issue with mixtures. More for low speed / light load on a turbo application. It gives each cyl a more sepparated source of air for better mixtures. Once force fed it becomes a non issue and restriction takes over as the big problem. Longer runners might be slightly more restrictive in that situation. Bell mouths help improve over the factory design and perhaps might offset he shortening of the runners a bit for less pulse interference.

I did see a pic recently of a Stryder plenum and the bell mouths seemed to be hard up against the walls of the plenum, that would kind of negate the benifit they have.

The Plazmaman units look very good though.