Ok, so I know the pros and cons of each for the most part....MEVI gains about 30-40 whp over USIM while you loose 8-12 wtq. 80% of my driving is city and I get on the highway about 1-2 times a week.

Those with the MEVI, is the torque loss really noticeable? I have just purchased one, but I am still contemplating on whether or not to install it. Since all the links on the MEVI FAQ are down....and yes, I have tried replacing "show" with "old" and all that crap....just let me know what you would do. Thanks.

 

You're 5MT and have a USDM and do a lot of city driving. Seems as if USDM is for you. Kinda like SteVTEC

 

Seems like the MEVI would be a good choice, but I dunno, I've heard that the only real gains you get is if you raise the rev limiter, just what I've heard though.

 

Yeah, personally unless you do ALL freeway driving MEVI + No ecu isnt worth it. But if you do MEVI + JWT i would definatly take it over usim even in city driving.

 

Gotta have the JWT and 5speed. World of difference in the city

 

yea dude 96blkonblkse and Nismo have a vaild point

 

my mevi didnt work well until i got ecu - now it hauls over a usim any day.

mevi ftw :P

 

dude i was runnin mevi with no jwt and it wasnt bad at all....there is a little decrease but its not enough to hold you back or anything. i used to shift around 6000rpms though

 

I feel the MEVI shouldnt be put on unless you are going to get a JWT....Otherwise it is not as a good as the USIM.....IIRC the MEVI has a little less peak torque over the USIM....

 

I thought the 00vi was better then the mevi...

 

Nobody said it wasn't. ^^^^^^^^^^^

 

30-40 whp?

 

^^^^^^@ 6550 ^^^^^^^^^^^^

 

this is such an old topic :P

I have actually owned a Cefiro 3L VQ30DE before - they come from the factory with a MEVI and it had heaps of power.

I also got a Nissan Maxima which came with a USIM - i got a manifold off a wrecked cefiro and bolted it on and it still didnt have the top end power the Cefiro did. I had a summit rpm switch activating it at 5,300 rpm (apparently the optimum setting).

I had to tune the car with an emanage to tap the MEVI's potential. I'd assume that the Maxima is tuned for the USIM and not the MEVI - I found that by stock the Maxima runs too lean at the bottom end and too rich at the top end for the MEVI. Once I corrected these factors the car started behaving more similar to my Cefiro.

Under inspection of my JDM cefiro ECU the ECU's are COMPLETELY different - even the wiring loom is different - i'd also assume the map to different too.

Here's a few pics of a Cefiro ECU for a VQ30DE if you're interested...

 

Awesome information, can you be so kind and share the AF grahs and CF's(correction factors)?

Also, you state that the continental maps are different, is this WRT to IPW times, or AFR in general?

Sweet info man.

 

I see the start of a nice thread .. I am looking to see the corrctions also.

I know a jwt ecu will help with a mevi but I am looking at a em cause I run nitrous and do not want the advanced timing but would love the raised rev limiter

 

Just plain AFR. I must warn everyone though - this map is not just a generic accross the board map. You could maybe use it for a base map to work from but I advise getting it dyno tuned.

My mods are only a MEVI and HAI so far as far as engine goes - so everything else is stock.

 

Wow, great information Jordan. Too bad I cant reprogram the USDM ECU for less than $500.

I am seriously considering selling the brand new MEVI I just purchased from Courtesy. It comes with everything minus the RPM switch, but then again, the more I think about it, the more I just want to slap on the new manifold because its already all paid off. My main point of concern is the torque loss....and how noticeable it actually is.

 

the MEVI literally hauls over a USIM. You wont notice the torque loss.

A stock Cefiro vs a stock Maxima - the Cefiro will run circles right around it.

The Cefiro is more aggressively tuned than a maxima as well - and i believe this is the only way to fully utilise the MEVI's potential.

 

God damnit now I HAVE to get an EU.....

 

To me it only makes sense - something as major as a manifold imho changes the whole dynamic of the engine

it occured to me because when i swapped the manifold over it literally felt like i'd lost power by swapping the MEVI onto the maxima when I knew in fact it wasnt supposed to.

That map above is only designed to run the highest octane fuel available to myself. I know most of you here wouldnt put anything else but the best in your cars, but I find that if its anything lower than 98 i start to get a little mild pinging on hot days. Runs smooth as on 98 octane - and where I am its not uncommon to have days over 100 degrees F.

Also - dont let that put you off - 98 octane in australia is equivalent to your 91 I believe as we use different measurements...

 

ok so basically this is a formula for premium gas.....sounds good since the max only gets +91....I really have to save some money to get the EU.....I am really excited about what an tuned 3.0 auto can do...

 

Make yourself the Dandy of the AT.

 

How does this correlate with what you just said?


Are you just saying that the only way to fully utilize the MEVI is by tuning it? You would still recommend putting the MEVI onto an untuned Maxima? Just trying to clear things up.

 

30 to 40 WHP? That's a little optimistic, even at redline

 

I am hoping too be with his new numbers.....holy shi*.....I would be very happy to just break into the 13s let alone 12s

 

I have yet to see a DRF that shows less than 40whp @ redline. So yes, hard to believe, but it's true.

 

IIRC there was a dyno that said it did....its because the USIM drops off SO much that it is quite a WHP gain.....hell the Y gains like 30ish over stock y pipe after 6000 RPM....



I was beaten to it...

 

Yeah, i have seen many dynos, and 30-40whp seems to be the average. If you want to see some REAL gains lol ill try find my dyno with bolt ons + jwt ecu and the dyno operator took it to 7200RPM. God i peaked at like 195 at the 5100-5200rpm range, and dropped to almost 105whp at 7200. This was with the USIM lol.

 

I owned an actual cefiro once which come with mevi stock. I was stating that a MEVI on a cefiro will haul over a USIM on a maxima, but a MEVI on an untuned Maxima (I found) was a lot less powerful than a Cefiro - must be the map.

At the 1/4 mile I got a 16.2 with the USIM and everything else stock.

With the MEVI i got a 16.5. This could be atmospherics, or just that I wasnt so quick on the day, but basically what I'm saying is, I really dont think there is much benefit from a MEVI if untuned. That's my opinion.

My cefiro with MEVI and stock ECU, Y-Pipe, B-Pipe, UDP, HAI, VB Mod, TC, LSD, Tranny Cooler, Tranny Computer (Shift Kit), Auto did 0 - 100 in 4.5 seconds - it was great - pitty i had to sell it to move to australia

 

Now is that MPH or KMPH?


Im gonna assume it is KMPH....

 

yeah sorry.. km/h - thats 62 mph.. not that fast lol. I wish... :P

 

heres some pics of the old Cefiro I had - I miss it heaps - cant get Cefiros in Australia, only in New Zealand...







Plus some burnout pics if interested..

 

I'll believe it, but it still seems worthless to me when it's such a tiny area of the powerband you see a gain in with such losses elsewhere.

Then again I am an 00VI guy

 

MEVI with no ECU i can understand what you are saying, BUT mevi with ecu is not worthless. You are making more the same or more power past 5500rpm, all the way to either 7200rpm in my case. Obviously the 00vi is a better choice but people like me who rely on the maxi for daily transportation i cant have my car out of comission for more then a day, so the mevi was the to go for me.

 

Granted the USIM sounds better - i'll give it that...

 

yeah i noticed since i got the mevi on, my intake has gotten ALOT quieter. But i am still using stock intake resonator with jwt pop.

 

yeh.. its more of a refined sound, but the USIM sound MEAANNN... I wish the MEVI sounded like that... but to me power > sound.

 

WTF is a USIM?

Also TP ur car looks almost idenical to mine in the picture... lol.. .Except I probably have more mods.

 

United states issued intake manifold.....

also I am going to call a big B.S on that second comment....lets see a mod list.....