I installed the Mrev2 and 5/16 iso thermal at the same time and i did feel a little more kick in the top end. It also did add a nice grumble to the sounds. i got both for 640 and it was more cost effective than any exhaust(paid $1000) to which i felt no difference.

 

There have been many people who said it improved their milage and a couple who said it made it lower.

Either way, I havn't measured it. It would be a tricky test to precisely measure with absolute certainty.

My guess is that it will have some slight benefit but only when at high RPM @ WOT. Gas milage is bad at WOT anyways so its probably of no real consequence either way.

Tony

 

I have decided to get the 5/16 spacer for my non-revup(man am i sick of that word) and that's it. However, which one should I get...ISMO thermal, Basic or copper. I live in the Phila area. Doesn't really snow here much in the winter. Any suggestions?

 

i'll receive my MD 5/16 spacer this week!
can't w8 to c the result with vortech

 

Sorry about the name "NON-REVUP". Its to help minimize confusion for all the different variations of engines that Nissan puts out.

For the NON-REVUP:
G35 sedan rated at 260HP
G35 coup rated at 280HP
350Z rated at 287HP

For all the differences they put in their marketing brocures, if you were to dyno all three of these cars on the same dyno, the three plots would all lay right on top of eachother. Despite the marketing ratings, the engines are all exactly the same.

Hence when each different customer with a different car asks me what they can or cant use on their 260HP, 280HP, 287HP car I have to explain each time that they are identical.

Its not the consumers fault for asking. Its Nissan's and Infiniti's fault for trying to make people think there are three different engines in them.

Then they invented the REVUP engine. And they pulled the same nonsense on all three vehicles again. So it triples the confusion.

It seems the best way to describe them is its either a "REVUP" or a "NON-REVUP" engine. Plain and simple.

Thanks Nissan and Infiniti marketing!

Tony

PS - If it doesn't get very cold in your area, I recommend the regular Iso Thermal.

 

Thanks Tony!

 

same engines tuned differently.

 

In all the dyno testing I've done, they aren't even tuned differently.

If they have a difference in throttle response time, different speed limiter or other minor things, I will believe it. But on a dyno you could look at the three plots and not be able to tell a difference. ...Particularly with all the ECU variable that always move around. There is enough variation from pull to pull that they all look the same if on the same graph.

Even with a marketing difference of 260HP Vs 287HP (delta 27HP) I've overlaid the plot of a G35 Sedan and a 350Z and there is no significant difference as measured by the dyno.

There should have been a huge difference if there really was a difference of 27HP.

I wonder if they will pull the same trick with the new HR engine comming out in the new cars?...

 

So your saying there is more HP with the G35 sedan than the 260? Or less with the 287hp 350z? hmm this worries me, I expected the results stated from Nissan to be ACCURATE, shame on me!

By the way, I just sent my lower collector core back to the San Remo place address....

 

No, I'm saying they are all exactly the same engine with the same power.

Its good from the standpoint of mods that work for all the vehicles, but it makes it difficult for the consumer to know what parts are or are not interchangable.

 

If they are all exactly the same engine, the only thing that brings out more or less power are for example the stock intake, exhaust differences, etc?

 

i dunno if i believe the 260 hp G sedan dynos exactly the same at a 287 Z. I have my doubts about that due to my boy dynoing sig less in his G then my stock 287 when i had her. There are differnces in throttle aswell as other minor differences mostly intake muffiling abit more restirctive, but i guess we would have to see a dyno plot of all models and plot them in contrast. Im not
saying u a lying but driving in both cars. Theres a huge difference in 2nd gear from what i seen. Its really hard to tell due to the weight etc which plays part aswell. But i have a really hard time believing the 260 tune is the same at all to the 287 becasue u would want to market the G at that hp to compete and surpass bmw which where showing less hp. Then again, with the new SAE standards its gonna be really hard pressed for anyone to lie about numbers or inflate without underratting i guess. However one major difference i did see at the dyno was the revup vrs the 287. peak hp was def improved drastically over the 287 tune uptop. But of course tq is decrese sig aswell. I guess until we have the concrete evidence maybey we will know for sure. especailly since everyone has diff dynos diff corrections factors.,lmao

 

The dyno data attached is from two different 2004 350Z's and G35 Sedans.

The overlaid plots are all on the same dyno, same dyno day.

Can you say with certainty which if from the Z and which is from the Sedan?
I assure you the only difference here is the daily mood of the respective ECU's.

Dont read beyond this point without first looking at the plots and making a decision

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PS - the plot on the top is the Sedan. The only reason they have even a slight difference is the ECU temperment. They could just as easily switch roles the very next day.

 

would it be worth it for my Z (2k4 Touring A/T)?? i got the spacer....but would the Mrev help me out?...

 

Attached is another dyno plot different day same dyno machine.

This is my G35 Sedan with nothing but a Greddy single exhaust. The exhaust sucks BTW. Its no better than the stock exhaust. The only reason I have it installed is because I welded in a O2 sensor bung behind the Y pipe. ...I didn't want to hack into the stock exhaust or the Stillen dual exhaust I had.

Compare my G35 sedan results to the results of the stock 350Z dynod for the Sport Z Magazine Plenum Mod Shoot Out. Essentially identical.

Compare the 350Z plot from the post above to the 350Z plot from the Shoot Out. They are within the normal variability of the ECU. So you can be sure the two 350Z are within normal range of eachother.

This isn't an overlay, but you can still compare them. Different day, but the same dyno machine. There certaintly is no indication that the Sedan has 27 fewer HP.

EDIT --> The link is a Z dyno. The attached picture below is from a G35 Sedan.

http://www.motordyneengineering.com/...tAnalysis1.gif

 

Do you know your A/F ratio?

If your A/F ratio is at or below 13.5, then yes.

 

i dont know my A/F ratio...all i have it intake and exhaust...i didnt even put the spacer in yet...but once i do...will it change much?....

 

If you don't know your A/F I generally don't recommend doing both. it could run lean and not make much gain.

Wired24/7 (a moderator) recently did a complet write up with dynos, tune and more dynos.

 

but, since Zs are tempermental at dynos considering i have seen Zs (287) dynoing 220 to 240 , isnt this not entirely accurate. But i do see that both vqs are tuned rather similar , though i would have to say that the ecu is deff more agressive in a Z then any other vq35de based platform. But i do see ur point. Greddy catback looks like it harmed u more then benefitted u lmao. I still to this day have not found a ehaust that give gains aswell as sounds good lol. HKS already seen many dynos of a wopping 5hp. So im confused lmao. Nice charts. Gotta love the line of a VQ though either way in its class def very linear.

 

It is. Assuming they are all done on the same machine, the G35's and 350Z's all have this variability and the same degree of variability.

The variability is driven by the ECU shifting all kinds of operational variables around. But in any case, its the same for all three vehicles.

If all three vehicles (G35S, G35C & 350Z) were blind tested on the dyno, there would be no way to distinguish one from the other. I'm sure it would be possible to reliably measure a difference in controlled laboratory conditions, but under real world conditions (a typical dyno day) they all make the same power.