mr_smith126 Posted September 5, 2014 Share Posted September 5, 2014 Okay here goes, we shall start with a standard DE. Plenum spacer fitted will exceed the spacer performance gains over that of a GT4 and Revup - because the DE tunes better. Just the way it is. GT4/Revup A spacer alone will provide some gains but in order to gain over and above a plenum spacer on a DE you'll need a Motordyne MREV 2 lower plenum. A GT4/Revup will then gain more than a DE with just a spacer. Two ways to resolve the GT4/Revup. 1. Get a used or new MREV 2 2. Get hold of a DE lower plenum. Shave the front two ports flat which is all a MREV 2 is. I have a modified DE lower plenum with shaved ports and it performs exactly the same as the MREV 2 Considering what Motordyne charge, modifying a DE lower collector if done correctly will provide the necessary gains. Abbey will I'm sure suggest you buy a MREV 2 from them to see nice gains. To be honest the DE tunes better NA with added mods. GT4/Revup gain better power with FI, and furthermore with HR. Although the upper hand with GT4/Revup is the higher rev limit. So what is lost in lesser gains is resolved by a longer power band. Horses for courses really. Thanks Wasso, was a bit lost.. So basically even though they re-designed the plenum on the uprev, the best gains can still be achieved from an MVREV2 plenum (with a spacer) which is basically along the lines of a DE plenum with the ports modified.. So more dollars to do this mod on an uprev engine in comparison.. booo DE plenum GT4/UPrev plenum Motordyne MREV2 plenum for GT4/UPrev Quote Link to comment Share on other sites More sharing options...
Dynamic Turtle Posted September 5, 2014 Share Posted September 5, 2014 I have a H-Dev plenum spacer now on my car, the difference is immediately noticeable.. Highly recommend it. Without having an uprev done after fitting it?! Quote Link to comment Share on other sites More sharing options...
benjy88 Posted September 5, 2014 Share Posted September 5, 2014 Yes, I felt an immediate difference. It's not massive, but it's basically like having a bit of extra 'oomf' sat there waiting as soon as you press the throttle. Quote Link to comment Share on other sites More sharing options...
KyleR Posted September 5, 2014 Share Posted September 5, 2014 I think you'll find the "extra oomf" you are experiencing is a change in the tone of the intake noise. Quote Link to comment Share on other sites More sharing options...
Wasso Posted September 7, 2014 Share Posted September 7, 2014 You'll get roughly 25 miles of added benefit before the ECU has learnt and mapped the increased airflow. Engine noise/growl is there all the time which is a bonus. Quote Link to comment Share on other sites More sharing options...
Dynamic Turtle Posted September 7, 2014 Share Posted September 7, 2014 You'll get roughly 25 miles of added benefit before the ECU has learnt and mapped the increased airflow. Engine noise/growl is there all the time which is a bonus. Sorry does that mean you need an uprev to see any power gains? Mine is already uprevved, so would I need to remap the car again? Are these best done in conjunction with airbox upgrades? Are they worth the hassle expense (always struck me as a bit pointless but there you go) How much power would this add to a DE? +5bhp / +5lbft ? Quote Link to comment Share on other sites More sharing options...
Wasso Posted September 7, 2014 Share Posted September 7, 2014 Motordyne claim 11-13hp which is I've not heard of being achieved. 5-9hp is more realistic with TQ following just behind those numbers. ANY air in, air out mods need a remap to reward the gains. The standard airbox is supposed to give slight gains over aftermarket. Best to build a small list of mods and get the remap done all at once. To be fair though there's no harm in having an Uprev done, say with a spacer or exhaust. Then going back further down the line with decats and maybe a mrev2. The second tune is only charged at Dyno and Mapping time. The licence cost is during the initial Uprev tune and installed on the ECU. Quote Link to comment Share on other sites More sharing options...
longsh07 Posted September 7, 2014 Share Posted September 7, 2014 (edited) Had a chat with Mark at Abbey about this and he basically said the same thing as Wasso. The MREV2 is simply a modified DE lower plenum and the high cost is because they start with a brand new DE lower plenum. Combined with a spacer you'll see some nice gains. If it helps, my car is a 2005 GT4 (RevUp DE) and has been regularly serviced. Its also got the following intake/exhaust mods. Motordyne 5/16 plenum spacer Berk HFC's Milltek Y pipe, centre pipe and back box. HKS Super Hybrid panel filter. The RevUp engines airbox is also slightly modified from the DE airbox in that it has a velocity stack installed which helps funnel the air more cleanly into the intake pipe (after filter) After the RevUp she is producing 261 Hp at the hubs which equates to roughly 296 Hp at the flywheel. My car was supposed to have 296 Hp at the flywheel from the factory however time/wear will cause Hp to drop so its not bad for a nearly 10 year old car. Based on dyno sheets I've seen for stock RevUp 350's I've gained roughly 20Hp after ALL the above mods so I wouldn't expect the plenum spacer to give you a massive boost on its own (and I doubt you'll get any gain without a remap) In all honestly the only way you are going to see any noticeable Hp gains is by going forced induction (supercharger or turbo). That said, to keep the engine running sweet I'd suggest getting the UpRev tune done once you've finished making your changes. There's not huge difference in power but extra midrange torque and better throttle response are a plus for me. Edited September 7, 2014 by longsh07 Quote Link to comment Share on other sites More sharing options...
Wasso Posted September 7, 2014 Share Posted September 7, 2014 Also the published book figures for ALL 350's is wrong. Take it from manufacture to a dyno and you'll never see the book figures. I think mine was 245 at the hubs when just two years old. 1 Quote Link to comment Share on other sites More sharing options...
longsh07 Posted September 7, 2014 Share Posted September 7, 2014 Also the published book figures for ALL 350's is wrong. Take it from manufacture to a dyno and you'll never see the book figures. I think mine was 245 at the hubs when just two years old. This makes me feel a lot better about my 261 Quote Link to comment Share on other sites More sharing options...
Wasso Posted September 7, 2014 Share Posted September 7, 2014 Also the published book figures for ALL 350's is wrong. Take it from manufacture to a dyno and you'll never see the book figures. I think mine was 245 at the hubs when just two years old. This makes me feel a lot better about my 261 If you look at the "dyno results thread" everyone is super unhappy with their stock or tuned results because Nissan told big fat lies. Quote Link to comment Share on other sites More sharing options...
longsh07 Posted September 7, 2014 Share Posted September 7, 2014 (edited) Also the published book figures for ALL 350's is wrong. Take it from manufacture to a dyno and you'll never see the book figures. I think mine was 245 at the hubs when just two years old. This makes me feel a lot better about my 261 If you look at the "dyno results thread" everyone is super unhappy with their stock or tuned results because Nissan told big fat lies. Yeah I had seen that. Already set myself up for numbers lower than expected (if Nissan were to be believed). Still, its not about numbers at the end of the day. Love my car to bits and the modifications were totally worth it in my book (even if just for the noise ) Edited September 7, 2014 by longsh07 Quote Link to comment Share on other sites More sharing options...
Wasso Posted September 7, 2014 Share Posted September 7, 2014 Agreed and to be fair there's a lot more to the numbers, looks, appreciation, drivability, and of course the forum 1 Quote Link to comment Share on other sites More sharing options...
Dynamic Turtle Posted September 8, 2014 Share Posted September 8, 2014 Thanks for the explanation. Quote Link to comment Share on other sites More sharing options...
Karl92 Posted May 1, 2015 Share Posted May 1, 2015 Has anyone had experience with the SKunk2 plenum spacers or what is the best option for perfomance to go for ? thanks Karl Quote Link to comment Share on other sites More sharing options...
MarkZZZ Posted May 2, 2015 Share Posted May 2, 2015 (edited) Would something like a K&N version 2 induction kit help on the uprev or would i be better sticking to the modified air box and upgrading the filter inside? Would I be better leaving the engine alone, putting Cobra HFC on and having a Remap once fitted? Only mods i have so far are Cobra rear, centre and Y Black 350Z GT4 Edited May 2, 2015 by MarkZZZ Quote Link to comment Share on other sites More sharing options...
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