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Discussion Starter · #1 ·
http://my350z.com/forum/showthread.php?t=146774

For all you Z owners who are familiar with Tony's (from Motordyne Engineering) work with plenum spacers and his latest isothermal upgrades, he will be releasing shortly a new mod for the Ann 300hp spec engine, dubbed M-REV, that has proved to show gains of at least 17rwhp......yep you read right, 17rwhp......at least!! Making this the single highest hp bolt on mod currently available.

Tony dyno'd his plenum spacers on the 300hp engine and it delivered zero gains because the stock plenum already is airflow balanced. So for us 300hp owners he went back to the drawing mod and developed a mod specifically for us. This mod is being kept a secret until release date shortly. Tony has mentioned price incl. the isothermal upgrades will be around USD $500

Im a huge fan of Tony's work, his plenum spacers on the 287hp engine have showed positive gains, and his isothermal gaskets and copper throttle body mod significantly reduces the temp inside the plenum enough to be luke warm to the touch after hours of driving

Im going to be buying this mod when its released, however due to the weight of the item, shipping is going to be around USD $110. If there are any other Melb 300hp owners interested in this mod, we could split the shipping costs

Tony is currently updating his website, so i will update this thread with M-REV info once it's released

Sounds very very promising guys
 

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I just read thru alot of that link you supplied!

Wow, that guy knows how to hipe something up, but all it is as far as I can see is hipe, without any 'real' details.

Like someone wrote in one of the posts - 'It is a great mod for a newb!'

BTW before you get too excited, the latest so-called power increase stated was 17 hp and 19TQ and I would suspect it was at the flywheel?

Just trying to save you some money.

cheers
 

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I have a set of iso-thermal kit on my car.... and it does work!!! I was one of those guys who helped Tony tested these products... I did gain some power across the entire RPM range though... but the gains for my car isn't much as much because I already have a set of wild cams doing those intake jobs... but the gains are there... and also the iso-thermal gasket and coolant controller do work too... they are GREAT and beautifully designed for our cars! I am very impressive with the results!

cheers,

richie
 

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Discussion Starter · #4 ·

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Discussion Starter · #5 ·
ok guys Tony has finally released info on this mod

from what i make of it, it looks to be a modified 287hp lower plenum with the longer intake runner. The 300hp has shorter intake runners, thats why it loses torque over the 287hp. It also has a spacer which helps to make the extra power up high just like what happens when u put a spacer on the 287hp plenum

there has been another 300hp dyo'd with this mod, and just like all the dyno plots, there is a good 15-20hp gain through the low-mid range, then a small loss past 6300rpm





im not sure this would be such a good idea. The last thing id want is for the power to drop off at high revs like the 287hp, but would you seriously feel a 7-8hp loss past 6300rpm? And im a bit confused, because the 300hp lower plenums on 287 engines dyno'd with gains, but now 287 lower plenums on 300hp gets gains too??? :doh:

here's what Tony has to say about the MREV mod.....after the my350 guys twisted his arm for more info

I knew what the results would be before I even dynod it... It knew the moment I saw the REVUP 300HP collector dynod on a 287 engine.

The REVUP collector on a 287 engine showed a significant loss of power everywhere except the last several hundred RPM where it produced a only blip of ~10HP at the end of the RPM spectrum. Upon seeing the results I asked myself "Why would Nissan do that?" It looked like such an unfavorable compromise.

Even a 1/4" plenum spacer could easily produce greater gains above 5K and have no absolutely loss of HP and TQ everywhere else in the curve.

It seems the new REVUP collector was more of a marketing decision rather than a engineering decision. It does allow the REVUP engine produce a higher peak power and allows Nissan to legitimately advertise "300 HP". And this is what led me to believe it is more of a marketing decision. HP is what matters most to sales and the marketing department. Peak HP is what gets advertised in the magazines. Particularly when all the car companies are in a HP war. The old adage is true. HP is what sells cars. TQ is what wins races.

Nissan is in the business of selling cars. Winning races may be nice but its not Nissans primary objective.

I give special credit to [email protected] NISSAN. He was the first to post an A/B comparison of the 287 HP lower collector against the 300 HP collector on a 287 engine. That is when I saw the TQ and HP on his pre/post plots. I found that if you extrapolate the plots out to 7000 RPM, the compromise between the 287 collector and the 300 collector becomes more even in terms of total area under the curve because HP is rapidly diminishing above 6K... But I also know that adding a spacer to a 287 collector rapidly increases HP with RPM. See the attached plot below.

The question is. What if a 287 lower collector was dynod on a REVUP engine? You could expect more TQ and less HP. Would that be a desirable feature?... Only if it were a daily driver. There would be too much loss on the top end for tracking or drag.

But knowing that a spacer with a 287 collector rapidly increases HP above 5K. (see attached plot below.) At 6.5K it shows a spacer is increasing HP almost exponentially! If you extrapolate it out, it would produce nearly 18HP at 7K RPM. So this led me to questions what would the result be if a 287 collector and a spacer were combined and bolted to a REVUP engine?... This is where it gets interesting.

The 287 collector on a REVUP engine by itself would decline rapidly above 6K, but seeing that a spacer rapidly adds above 5K, it was surmised that positive and negative trends would tend to negate each other. But the only way to really know what would happen is to put it on the dyno and test it.

This is where Klumzyee and his REVUP G35 came into the scene. (Motivated by an offer of a "Free MOD" if he got it dynod.)

His baseline dyno was done for reference at the beginning of the day.

The First experimental test was simply a 287 collector on the REVUP engine. No other mods.
Results: Exactly as predicted. Much more power below 5.5K and a significant loss of about 20HP above 6K.

The Second test was a 287 collector and 5/16" Iso Thermal Plenum Spacer on the REVUP. No other mods.
Results: Much more power below 6K and a loss of about ~6HP above 6.3K. It was interesting to note that TQ was down very slightly from the 287 collector alone but HP in the high end was up substantially.

The Third test was a 287 collector and 1/2" Iso Thermal Plenum Spacer on the REVUP. No other mods.
Results: A mixed surprise. Yes, it produced about 2HP more peak HP in the high end than the 5/16" spacer but it also produced less total area under the curve than the 5/16" spacer. It lost quite a bit of TQ across a wide range of RPM.

Conclusion: Of the 3 configurations tested, the 5/16" spacer clearly produced more area under the curve than any other configuration. Its max TQ was only slightly less than no spacer at all and its max HP was only slightly less than the 1/2" spacer. Despite the fact that it didn't produce the highest peak TQ or the highest peak HP, 5/16" produced more power across a wider range than anything else. And it produced a lot more power than the stock REVUP collector. When you consider the trade of power loss above 6300 Vs the power gain below 6000, the modification produces a 12:1 gain in TQ and a 7:1 gain in HP. (a really good trade.)

If the 5/16" spacer produced more overall power than either configuration, it is indicating there is an optimum point for spacer heigth.

This observation is what indicates how plenum internal volume (and not just total flow area above runners 1&2) are important to the REVUP engine. Plenum internal volume has an optimum point. More volume isn't necessarily better. This observation also suggests engine performance is sensitive to the plenum internal acoustic resonance frequency.

But then again, I also know that runners 1&2 by themselves can benefit from the added flow area of a 1/2" spacer. So after analyzing and reviewing the data from Klumzyees dynos I thought of other ways to possibly increase power even more.

And this is where a modified lower collector came in.... Its essentially an attempt to try to get the peak gains of the 1/2" spacer and keep all the TQ of the 5/16" spacer.

I think what the engine ideally wants is a minimized plenum internal volume with a maximized clearance above the intake runners. So I tried to move toward this goal by modifying the lower collector.

The modified lower collector with a 5/16" spacer was tested on Alex's car a little more recently. You can see both Klymzyees and Alex's dyno plots on the first page of this thread.

The modified lower collector can be used if you don’t want a spacer at all and want the maximum stealth possible (but it won’t produce quite as much as the spacer). Conversely, the modified lower collector can also used in tandem with a spacer for additional breathing room above intake runners 1&2.

So there you have it.

MREV is a 287HP lower collector with a spacer... with an option to modify the 287 collector to squeeze a little more power out of it, or to just keep it 100% stealth.


price is $487 with the iso thermal gear. Optional gear is the modified lower collector for $100 and copper throttle body for $70........seems like alot of money to me, i think ill wait for pics as im confused as to what this modified lower collector could look like
 

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Sam:

You will need to remember that Jason didn't reflash his ECU with the 05's lower plenum mod... that means, the car could be running lean with all the air rushing in at the mid range and only gain power at high end (factory gives more fuel - rich at high end)... And of course he would have experienced some torque loss due to the shorter runner (thanks for the explanation from nuff), but don't think it is that much more than what dyno curve described though...

After I spoke to nuff and nizmo pete about these, I have ordered a 06 lower plenum, then I will ask nizpro to run dyno on both lower plenum with spacers on my rebuild engine (in 1-2 weeks time) and see how much we lose/gain at mid/high rpm range...

btw, with just my cams+computer, I gained around 2-3rwKW from 3000rpm to 5000rpm, then lost around 2-3rwKW from 5000rpm to 6000rpm, then regained around 3-4rwKW above 6000rpm.

cheers,

richie
 

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Discussion Starter · #7 ·
yeah rich i didnt bother with this mod

i dont want to lose the top end pull of the 300hp engine

i just recieved today the isothermal gaskets and copper throttle body
 

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But sam,

you should feel the torque on the Track model though... I could feel the definitely have more pull than the 35th edition... probably you will like that better because we don't see much of 7000rpm everyday on the street.

cheers,

richie
 

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Discussion Starter · #9 ·
the extra torque would be good, but when im having sum fun, i always rev past 6000, i love the sound and pull up high

when i was buying the Z and test drove the 287hp, i didnt like how the car wouldnt pull past 6200rpm, it felt like it was choking
 
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