so who wants to take the lead on this ultimate-plenum-mod shootout? someone knowledgeable needs to lead/organize it so its done right/scientifically. oh yeah, they need to not have a dog in the hunt, too.

 

When I was calling around today SP said they were doing one this weekend... I am a instant gradification customer my self

I guess I can go about arranging one again?

 

Hmm, maybe we could get Sport Z magazine out there to cover this, that way NO ONE would miss out!!!

 

ill be doing a step by step of the install of the lower plenum...

plus video taping the dyno runs on wednesday...

I may even go tomorrow if we can get the plenum installed earlier enough...

but TONY wants to have his headlights checked out...

POLL: Check out tony's head lights, or install plenum so we can dyno tomorrow

heheh (just kiddin tony... )

 

Haha...

I have a strange...yet strong feeling, that Tony's headlights are going to be put on hold...





...j/k

 

Nice thread, am very curious to see if the new plenum is contributing to the drop in torque for '05...

 

Just saw that VQ35DE makes 298HP. 298?!? They couldn't have squeezed out 2 more lousy HP...WTF?

 

Some people have questioned me on the dyno graph why it said I had 400 something HP and 200 something torque...

The scale on the left was for HP and is scaled up to 500HP.. .the Right is for TQ and is scaled to 300...

that is why the torque curve looks soo much higher...

I put my photo chop skillz to work and put together this graph that isnt exactly accurate but a better idea so it can be compared to other dyno charts...

i tried getting them to print one like this for me but they couldnt :-/

 

hey,my headlight is probably a warranty issue, would only take a few minutes.... Geez, want me to crash at night with no headlight on? I see how it is........

I really want to try and get Jason out to the dyno today so that we can see the gains, because I really want to put this on my car too.....

 

Now you're talkin!

As far as getting an unbiased, objective, intelligent and experienced moderator... that is a very good idea. We need somebody from Sport Z Mag and/or the Nissan Motor Corporate headquarters (NMC) to come out and be the moderator(s). Both Sport Z and the NMC headquarters are local to the area.

I bet even NMC would be interested in the results (if they haven’t already done it). For Sport Z and forum members this would make "The Ultimate Plenum Mod Shoot Out!!!" .... For Nissan and other manufacturers, its a damn good research project.

It would also be a good idea to have at least one representative from each manufacturer to oversee every mod installation on the test vehicle. With the ability to inspect and make sure there are no hidden/selective tweaks on the car, it would make everyone feel more comfortable with fairness of testing.
This must be done fairly, objectively and scientifically.

It would be preferable if the reference vehicle was completely or predominantly stock. Most of us aren't completely stock but it would eliminate any other possible influencing variables that could alter results.

Testing of this magnitude could take many hours if not the whole day. ...I'm in.

 

Got that one. See the last couple of pages of;
https://my350z.com/forum/showthread....hreadid=108468
for my dyno data.

I'd need to get ahold of a new lower, Kinetix, Crawford, and Motordyne kits to do a complete flow-bench comparison test. Don't forget, 350EVO is working on a complete new plenum design (ala Top Secret???)

While I agree, you can't replicate the pulse flow characteristics on a flow bench, you can't replicate all the permutations of mods and mfg. deviations on a dyno either.

That means we need to do both (a dyno shootout and a flowbench day) to more completely understand the differences with all these options.

 

Im only teasing tony... We have pleanty of tech's to take care of us all...

Im on my way now... Going to put my car in service as soon as I get there...

 

Roark,

Could you give a description of your flow bench, flow pressure, flow volume, pressure sensor accuracy/repeatability and so forth. If its a leaf blower connected to manometers, pito tubes, and a plenum that's cool too. What ever works.

I'm not doubting you can do a good job, its just that having done this sort of thing myself on rocket and jet engines (and now plenums), I'm curious about the test set up.

Thanks,
Tony

 

we don't need nissan USA or etc... to moderate dynos.
Otherwise, all other dyno talk about plenums to this point may as well be tossed out the window. and then while we're at it, dyno sheets for exhausts, and basically all other aftermarket parts lol.
I think we're getting WAY too into it here. let's just have fun, and see what happens..........
Also flow bench testing would be really cool to see some specs on, but isn't it really hard to duplicate the characteristics of an engine, in a test like that? I mean under different load condition, etc... the air flow will change accordingly etc....

I think that the main part here is the dyno. I'd love to see all the plenums and spacers put to the test, to resolve alot of talk. I think it would be good for the Z guys.....

 

Oh, I also emailed David, the editor of Modified Mag, (the one who's gonna feature my car), to see if he would be interested in doing a feature article on a plenum dyno shootout.
I'm waiting to hear back from him........

would be nice to test out.....

 

so any news on the second dyno from Jason yet?

I skimmed through, did not find anything.

Btw - glad to see the site back up. I like it!

 

Jason has given us a full review here: http://www.350zmotoring.com/forums/s...ad.php?t=23423



Gains above 6,250 rpm. Loss at mid range. I think the part would work well with Technosquare rev limit removal. Would be great at the strip or on straight-aways at the track. However, probably not the best for daily driving or for people unwilling to go beyond preset rev limits (something I just discussed with someone in the know that said this remains a bad thing to do).

Have to wait to see if things change after flash and if that gain keeps going up beyond 6,700 rpm. And, I can see why the 35th has gains in peak horse power and loss in torque. This part has a lot to do with it. I kind of wish Nissan didn't mess with the tq/hp. I really think the 300 hp track is marketing and that the older setup has more usable power for everything short of pure track/strip.

 

can you comment on why increasing the rev limit is a "bad thing to do"?

 

I have been told that the Z is well tuned from the factory and that Nissan engineered the Z close to the limits of the engine. Detonation, engine break down are the risks of going beyond the rev limits.

I believe the fact that there were significant part changes with the pistons, rods and other parts when Nissan raised the limits on the 35th to 7,200 rpm is an example of Nissan doing what's necessary to prevent a problem with the increased revs. I believe, someone like Jason who is installing all the proper parts is less likely to have a problem with raising his revs. Ditto anyone who does an engine build for FI who is also bumping the revs.

When I eventually do an ECU mod, I'll probably ask Tadashi to get rid of the speed limiter but, I'll follow the advice I've been given and keep my rev limits where they are because the source of this information is a reliable as it gets.

 

The only reason the rev limiter is where it is at for the non-REV-UP 350z's is because the engine just doesnt make power above 6700RPM...

With this REV-UP mid-plenum it will automatically make it so your peak power is around 6850RPM making a redline of 7200 worth while...

Now... there is ANOTHER VQ35 plenum that there is only one of in the states that is used on motors that will go make power at 7800RPM... We are working on building a motor using this mid-plenum...

I will be installing a crawford cast plenum with my REV-UP mid plenum and dyno'ing the same...

My car since the dyno is alot more responsive then how it was when I first installed the plenum...

I really wish My rev-limiter was removed and I can go up to 7200RPM if not higher... Once the car hits 5800RPM you feel it really start to pull... the top of 2nd gear is now like the top of 1st gear...


Still very happy with this mod... Just wish I could raise my rev limiter sooner...


My plans have changed since I put this on my car...

My goal is a 350-370 RWHP NA motor built with the 46CC heads, the mid plenum, crawford plenum...

The stock connecting rod bolts are perfect... just needs stronger bolts (use NISMO Bolts)... ANy forged or even the REV_UP connecting rod bolts are heavier... I also looked into other pistons... but the other pistons are heavier which is a no no even for stock compression... so why bother... the stock pistons are actually really good and have a good coating on them...

so...

parts are on order just waiting for them to get here now