rice boy Posted January 22, 2007 Share Posted January 22, 2007 I'm thinking of getting one has anyone got any recommendation? how much will it cost to install, is it hard DIY ? apparently you can get a non branded for about $300-600. Link to comment https://www.sau.com.au/forums/topic/152915-skyline-gtt-plenum/ Share on other sites More sharing options...
342Four Posted January 22, 2007 Share Posted January 22, 2007 but dont u HAVE a r34 GT-T???? why would u want another plenum for when u already got one of them on ur car unless its a aftermarket front throttle body opening one that ur talking about Link to comment https://www.sau.com.au/forums/topic/152915-skyline-gtt-plenum/#findComment-2844220 Share on other sites More sharing options...
SKY 34 Posted January 22, 2007 Share Posted January 22, 2007 plenum looks cool ~~..I reckon if it's going to cost $600 get the Greddy ones, the Stock TB is not going to fit into the plenum unless you have them custom made....either get an adapter plate or change the TB. If you do change the TB, the traction control will be removed. You notice that The Gtts have longer TB than normal...hence replacing the TB will require some custom pipe to be made to replace that length... with the Greddy ones I think you'll need top feed injectors and fuel rails Link to comment https://www.sau.com.au/forums/topic/152915-skyline-gtt-plenum/#findComment-2844361 Share on other sites More sharing options...
rice boy Posted January 23, 2007 Author Share Posted January 23, 2007 but dont u HAVE a r34 GT-T????why would u want another plenum for when u already got one of them on ur car unless its a aftermarket front throttle body opening one that ur talking about Yes, I want the after market one. less piping and cooler induction. Link to comment https://www.sau.com.au/forums/topic/152915-skyline-gtt-plenum/#findComment-2844980 Share on other sites More sharing options...
SKY 34 Posted January 23, 2007 Share Posted January 23, 2007 cooler induction? umm how does larger plenum reduce piping? what mods you got? Link to comment https://www.sau.com.au/forums/topic/152915-skyline-gtt-plenum/#findComment-2845013 Share on other sites More sharing options...
32vspecII Posted January 23, 2007 Share Posted January 23, 2007 the aftermarket plenums are forward facing , so you cut out all the cross over the engine part of the piping but the stock plenum is good for lots of HP and flows very well , not really a worth it just to cut a foot and half of piping out Link to comment https://www.sau.com.au/forums/topic/152915-skyline-gtt-plenum/#findComment-2845954 Share on other sites More sharing options...
rice boy Posted January 23, 2007 Author Share Posted January 23, 2007 the aftermarket plenums are forward facing , so you cut out all the cross over the engine part of the pipingbut the stock plenum is good for lots of HP and flows very well , not really a worth it just to cut a foot and half of piping out well actually for me it at less 3 foots. the way I see it .....less volume=easier compression=less stress on the turbo.. =cooler air= better preformance. Link to comment https://www.sau.com.au/forums/topic/152915-skyline-gtt-plenum/#findComment-2847796 Share on other sites More sharing options...
32vspecII Posted January 23, 2007 Share Posted January 23, 2007 3 foot is still nothing your theory is correct but in practise there will be virtually no benefit also lots of the aftermarket (cheaper) plenums are poorly designed , dont flow as well and tend to have uneven air distribution across all the cylinders casing some of them to run rich or lean apart from the visual appearance no benefit has been covered many times in the forced induction section if you want to search Link to comment https://www.sau.com.au/forums/topic/152915-skyline-gtt-plenum/#findComment-2848151 Share on other sites More sharing options...
Butler Posted January 23, 2007 Share Posted January 23, 2007 i agree. the stock plenum is good for close to 500hp so unless your shooting for big numbers or have a space issue then i would put the dollars into something worth wild Link to comment https://www.sau.com.au/forums/topic/152915-skyline-gtt-plenum/#findComment-2848224 Share on other sites More sharing options...
rev210 Posted January 24, 2007 Share Posted January 24, 2007 The stock plenum is better than a crap el'cheapo one. However a well made unit is another story. The plazmaman plenums increase power over a stock plenum as a bolt on ($1,100 no crap required unlike the Greddy) not to mention the benifit from reduced piping volume, length and very restrictive bends. The stock plenum might be good for 500hp. A good aftermarket one will get 500hp with less effort. The cheapo units however are not worth bothering with. $1,100 for a good bolt on one is value. Link to comment https://www.sau.com.au/forums/topic/152915-skyline-gtt-plenum/#findComment-2851547 Share on other sites More sharing options...
SKY 34 Posted January 24, 2007 Share Posted January 24, 2007 i agree. the stock plenum is good for close to 500hp so unless your shooting for big numbers or have a space issue then i would put the dollars into something worth wild are you sure? I think they'll only last to abt 350-400hp and you can use the Greeddy r33 gtst ones to suit r34...I got them off Nengun for $1020 these units are direct bolt on as well...at least that's what I was told...haven't fit them yet Link to comment https://www.sau.com.au/forums/topic/152915-skyline-gtt-plenum/#findComment-2851865 Share on other sites More sharing options...
32vspecII Posted January 24, 2007 Share Posted January 24, 2007 well over 350hp 350rwkw easy on the stock plenum , apart from the annoying cross over i/c piping its a a very good intake Link to comment https://www.sau.com.au/forums/topic/152915-skyline-gtt-plenum/#findComment-2852403 Share on other sites More sharing options...
rice boy Posted January 25, 2007 Author Share Posted January 25, 2007 well over 350hp350rwkw easy on the stock plenum , apart from the annoying cross over i/c piping its a a very good intake to be honest, it hard to judge unless there someone actually done some experiment on it. theory is all good and I do appreciate everyone opinions. by the way had anyone read about it or had converted the standard 25det plenum or any cross over plenum to non cross over? I, myself witness my mate did it to his Mk3 Supra but he also did few other mods as well so we couldn’t really judge if the cross over had makes any difference. But I think I can work it out if we will pull all the paper works out and investigate. it that is if he still got all of the paper work. Link to comment https://www.sau.com.au/forums/topic/152915-skyline-gtt-plenum/#findComment-2852607 Share on other sites More sharing options...
32vspecII Posted January 25, 2007 Share Posted January 25, 2007 (edited) there is lots and lots of evidence , pre and post dyno runs in the forced induction forum , search its been pretty well gone over now , no flow increase for the aftermarket plenums at this power level you can convert stock to fwd facing but you have the same problem with uneven air distribution get the proper greddy one if you want to do it , not that expensive and they work properly . just no flow gain. look good though Edited January 25, 2007 by arkon Link to comment https://www.sau.com.au/forums/topic/152915-skyline-gtt-plenum/#findComment-2852980 Share on other sites More sharing options...
rev210 Posted January 25, 2007 Share Posted January 25, 2007 Honestly the fact that the plenum allows 350rwkw worth of air through it means very little. Air flow restrictions to an extent can be overcome by working the 'air pump' (engine) harder. The good thing about the factory plenum is that it had long runners for better off boost performance and is pretty good at evenly distributing the air going into it at moderate power levels. It has a fairly low volume plenum chamber for suited to the airflow needs of the factory engine, helping with low end rpm response. The bad things are that , the plenum chamber volume is a tad small for bigger power levels requiring bigger airflow and cylinder fill rates. It will be well down on power compared to a good aftermarket unit with the same equipment. At 500hp I'd say there would be a significant difference indeed. It faces in such a direction as to cause restriction and dull response when coupled to a FMIC (not an issue with the factory side mount though). As for modification of the factory plenum, Grandenko did this to his RB25det and reported no ill effects and increased response. As to whether the cylinders fill evenly I'd say there may be an issue as the stock plenum isn't tapered to suit the front feed airflow bias to the rear cylinders. Link to comment https://www.sau.com.au/forums/topic/152915-skyline-gtt-plenum/#findComment-2853005 Share on other sites More sharing options...
rice boy Posted February 3, 2007 Author Share Posted February 3, 2007 thanks for all inputs, you guys has help me with my decision. with all of these inputs I think I will install the after market Plenum after all my performance upgrade. Cheers for all. Link to comment https://www.sau.com.au/forums/topic/152915-skyline-gtt-plenum/#findComment-2876903 Share on other sites More sharing options...
mitchy_ Posted February 3, 2007 Share Posted February 3, 2007 ive got a stock plenum modifed to front facing for sale if anyone is interested. Link to comment https://www.sau.com.au/forums/topic/152915-skyline-gtt-plenum/#findComment-2877044 Share on other sites More sharing options...
rice boy Posted February 3, 2007 Author Share Posted February 3, 2007 ive got a stock plenum modifed to front facing for sale if anyone is interested. you got any pics?? and what are you ask for? Link to comment https://www.sau.com.au/forums/topic/152915-skyline-gtt-plenum/#findComment-2877562 Share on other sites More sharing options...
Driver Posted February 3, 2007 Share Posted February 3, 2007 I'm thinking of getting onehas anyone got any recommendation? how much will it cost to install, is it hard DIY ? apparently you can get a non branded for about $300-600. pfft you ARE a rice boy. Link to comment https://www.sau.com.au/forums/topic/152915-skyline-gtt-plenum/#findComment-2877695 Share on other sites More sharing options...
rice boy Posted February 4, 2007 Author Share Posted February 4, 2007 pfft you ARE a rice boy. not thing is like a good joke mate. Link to comment https://www.sau.com.au/forums/topic/152915-skyline-gtt-plenum/#findComment-2878137 Share on other sites More sharing options...
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