130,000 mile car??? I am really thinking about getting one. Just need some advice.

 

The main side effects will be a slight loss of midrange torque and a gain of about 25 horsepower at redline.

 

Just make sure your engine is in good condition. To make use of the VI you have to redline the car. If you don't want to take chances with redlining then don't get it. You may lose some low end power so you would need to redline to make up for the low end loss if racing.

 

there will be no ill effect at all.

 

ummm...

ok a mevi is worthless without a ecu
if you do it without the ecu your making your car slower
only do it if you can afford both

if i were you i'd buy a VB mod and an underdrive pulley...which is about the same as a mevi(in price $$$) and will actually make you faster instead of slower(mevi with no upgraded ecu)

thats what i would do...btw your car is hot mod on brutha!!!

 

wait mevi gives 25hp??
is this on a S/c maxima or something. Or is that at like 7500 rpm with ecu or something crazy.

 

no thats mevi gives 25 hp on a stock car, add ecu and u make more

 

how bout with spraying what will th3e mevi do with no ecu?

 

ok here's how it worksapprox. hp #)

Stock max:
160whp @ 4,500rpm
130whp @ 6,500rpm

Max w/Mevi:
145whp @ 4,500rpm
160whp @ 6,500rpm

Max w/Mevi and ECU:
170whp @ 4,500rpm
165whp @ 6,500-7,500rpm


Again these #'s can be off a tad but you get the idea. You really need both the ECU and the Mevi to get the full benefit.
-Paul

 

wow i really didn't know the benefits of a VI with an ECU. I always thought that there would be a really big loss with the mods. But approx. you would only loss a small percentage of hp at mid range. The high end hp is way more promising than the loss of mid range.

I WANT ONE!!!!!!!

 

just curious...does it make a difference between automatic and 5speed with the MEVI? are the gains the same with both trannys?

since i have an automatic, i would assume that the MEVI would help the auto more since the rpms takes alil bit longer to rev each gear, since its 4 speed (right?) so on that note, the mod would be perfect for auto racers.

and one more thing. ive heard theres some sort of shift switch or something. do you still need this for an auto?

 

Yes and no - depends on skill of driver in a 5spd.

The short shift switch - dont worry about that....O/D is good enough

 

So you have a VI? You ran your car at the track before your VI and you were slower after it? Then you got an ECU with an extended redline and deemed the VI worthless without it?

Why are you misinforming members? A VI will not make a maxima slower. It just drasitcally changes the power curve. A VI will not make 1/4 mile times slower and it will pull much harder after 60 or 70 mph then a maxima with a stock manifold.

 

The Max95,

Do you know what causes the power (HP) to drop at the lower RPM'S if you don't have an upgraded ECU. Can a fuel controller be used instead to cure such a problem. I'm planning on getting the Apexi VTEC fuel controller to control the activation of the MEVI and fine tune the fuel lean/rich conditions before and after the activation of the MEVI.

Eric

 

i have the usual bolt ons (y-pipe, intake). Because i have mods that allow air to free more freely, will i see more than a 25 hp increase since i'm better than stock?

 

He's just never heard of a POWERBAND that's all.

 

Maybe the actual runners on the MEVI are a bit shorter than the stock 4th gen runners.

TK

 

Yea I don't know for sure but that's what I was thinking the reason was for less hp in midrange.

Let's get some guys with mevi's to help us out. Any Mevi Pro's out there?
-Paul

 

I don't have a mevi. im repeating what I’ve read on here and from the dynographs I’ve looked at, a max with mevi and no ecu upgrade it seemed pointless to lose so much midrange...also as a daily driver loosing midrange sucks imo. But it sounds like you have more experience so preach on. Haters.

 

sorry to ***** the thread but sense a mevi won't hurt a car with 130k , but when i get a ecu will shifting at 7,500 hurt it bad. I got almost 140k and my car sees reline at least once each time i drive it.

Also if i have afew bolt on like exhaust and intake and pulley, will i still loose as much hp if i dont get an ecu right away.

 

I would not rev out a VQ30 with stock valve springs and retainers to 7500. 7200 is pushing it a bit but I have not had any problems yet.

 

Not hating, just correcting your misinformation.

 

The reason it looks like they lose "so much" midrange, is because the MEVI flattens out the torque spike that seem to be consistent with stock 4th gens. Try overlaying the graphs and look at losses from 3k-5k. Its definitely less midrange with the MEVI, but the peak numbers are deceiving. That little spike in torque, makes it seem like the MEVI is causing the engine to lose ~20ftlbs to the wheels, when in reality its closer to like ~10ftlbs.

TK

 

Correct me if I'm wrong but from experience, short intake runners equals higher HP, or does the MEVI just retunes the whole engine to have an increasing HP as the RPM's increases....

 

Longer intake runners will give you more torque at a lower rpm, and shorter intake runners will give you more torque at higher rpms. More is in respect to each other. Meaning you may lose low end and gain top end, or vice versa. Ideally, you would want a variable intake system, with 2 separate runners, long and short, uses the long runners for more torque down low, and then switch to the short runners for more torque up top. Unfortunately the MEVI, isn't designed that way. It uses the 'dynamic supercharging' method. It has chamber(s) measured to a certain length, so that when air goes into the engine, the air hits the valves when they shut, and travel 'backwards,' and go into the chamber, and then bounce back into the engine when the valves open again, so in essence you send the air that was bounced back with the next wave of air. The size of the chamber, the length, is designed to reflect the air back at a certain rpm, and this is where the MEVI gives more top end. The chamber(s) opens only at a set RPM, so until the chamber(s) open, the manifold will act as any other single stage manifold. Anyone feel free to jump in and correct me, but this is my understanding of it thus far. But since the MEVI acts like any single stage intake runner until the chamber(s) open, thats why I guessed that maybe the runner lengths themself were shorter than the ones found in stock 4th gens.

TK

 

So does it matter which Chip I get?? Are yall saying get the JWT(with redline pushed to 7500) chip instead of the Technosquare?

 

it not a chip. it is a replacment ECU.

 

This has been talked about too much, our MEVI does NOT have shorter runners, kinda like our rear suspension, not independent, yet not a solid axle, just one of those things, read up on it a few posts up.. SkylineGTR pretty much summed it up for you guys. The MEVI also seems to benifit the auto more because of its longer gears, so most if not all auto people would not be slower with MEVI, actually faster.