Front facing R33 cut and shut plenum

[GTS-t VSPEC]

Looks like front facing plenums are in high demand. I could have my old one converted if anyone is keen:D

[RB20LagWagon]

Or people could just get their own manifold converted, or SAU could have a donation plenum, which would get converted to front facing, then their own plenum would become the donated one. BTW the rb20det is not the same as rb25det. By the way, if your looking for something sexy thatll look good at car shows etc, the converted plenum probably isnt for you, there are greddy ones that probably are.

[N I B]

Per4manz now have new custom plenums for RB25s.

[GTS-t VSPEC]

LagWagon,

I was suggesting mine so that people could have the plenum made while there car was still on the road:D

[RB20LagWagon]

Yar, but you would be wanting some coin in exchange right? thats usually when the word Keen is used.

SST Steve, how much are these plenums retailing for? Do they just fit on factory runners? Do they have trumpets or utilise angles ? If there is one for the rb20 ill be interested in the future.

Cheers

[GTS-t VSPEC]

Either an exchange or purchase:p

[NO_RSPECT]

LOL

anyways fellas I have Pmed both gradenko and R33 impul so all is good. Gradenko lets hope the budget holds out, no cyclones on the horizon up in the northen suburbs

thanks for all the input

i think that it seems like such a simple idea and such an easy install in terms of simplicity, it is difficult to reach but not alot can really go wrong from looking at it hey.

Anyways this can be closed if needed,

hey steve whazz the cost the for the per4manz ones

[RB20LagWagon]

There can be some unproven ideas with the cut n shut plenum, mainly about airflow. Nissan wouldnt have spend lots of dollars designing a plenum for one way its not gonna work the same if you alter it. But so far so good i spose

[N I B]

Ask Grant.

[adam 32]

with the amount of engineering GReddy and other intake plenum designers put into their plenums one would have to assume that simply relocating the throttle body isnt going to work quite as well. but on a budget there isnt anything else

youve also got to ask yourself what saving 1-1.5m of piping is really worth with reference to a cut n shut job

[Gradenko]

youve also got to ask yourself what saving 1-1.5m of piping is really worth with reference to a cut n shut job

IMHO, yes, its definetly worth removing 1m or so of piping, even if its means using a cut'n'shut. In any case, I'll post a objective review after its done. Specifically looking at power gain after tuning (if any) and change in throttle response. Could also put it on a flowbench to check flow distribution. Anyone know of a place that'll do it at mates rates?

Take a look at 1JZ and 2JZ plenums. From the outside they look remarkably similar to our cut'n'shut job.

[adam 32]

its the length of the runner relative to the original position comapared to the relocated position thats important though

ie nissan designed cylinder 1 and 6 (the ones people question) to be the same distance from throttle body, cut n shut the plenum and now its completely different

[Gradenko]

I'm not convinced Nissan went to any great lengths designing that plenum. Sure, it worked out well that air flow distribution was equal, but it seems to me their number one design goal was shortening the distance from ic to tb. The inside of the stock plenum doesn't have any special deflectors or flow distributors (AFAIK), and like I mentioned, there doesn't seem to be anything stopping it from behaving like a JZ plenum.

Just in case, I'll clean and flow the injectors, installing the highest flow for cylinder 6 (cause its most likely to run lean) and lowest flow for cylinder 1.

[25GTT]

Originally posted by Steve-SST

Per4manz now have new custom plenums for RB25s.

Heya Steve how much are they charging for these off the top of your head? do you think they would do an sau discount or something if a few were interested?

[GTS-t VSPEC]

Dan, I'll be at SST/Per4manz tommorow, I'll ask Grant for a price:D

[N I B]

I have done a few front facing RBs and theres been no problems at all even long term.