pod97654

iTrader: (13)

I am looking for someone to help me understand the difference between the two different intake set-ups. i have a line on a full MEVI intake setup but i want to know if it's worth the money. i curently drive a almost stock 98se with a short ram intake, and stillen y-pipe. i heard i will loose mid-range power? if it even worth my time and money, or should i only worry about geting The 00VI set-up? someone help me PLEASE!!!

Puppetmaster

iTrader: (48)

Have you read through the Stickies yet? Plenty of info there that will help answer your question.

pod97654

iTrader: (13)

Well i can see the slight difference in horsepower. but i would like to know a few other things. like the difference in driveing the car with each setup? do i have can ecu's for the MEVI. more importantly will i loose midrange power from stock with the MEVI without a ecu upgrade? What future upgrade make more power because of the upgraded intake?

Ceasars Chariot

iTrader: (16)

from what i understand, with mevi you lose low end power vs USIM, but to counter the loss you upgrade your ecu with JWT ecu with extended rev limiter.

pod97654

iTrader: (13)

What is the cause of this loss of power? is it because of lack of air? or to rich of a mixture? i sure hope it is not becasue it's geting lean. does any one know? and a reporgramed ecu does not reclaim your lost midrange, just adds a higher redline to compensate?

NmexMAX

iTrader: (22)

It's probably more related to resonance physics than anything else.

No, it adds midrange power, which evens the playing field AND extends rev limit/fuel cut.

My redline is the same the ECU just lets the needle travel further ..

pod97654

iTrader: (13)

Corect me if i am wrong, but the MEVI & 00VI are both just upper manifolds.
Would porting and bench-flowing the lower clean up the mid-range powerband with out the need to the ecu upgrade?

motocross416

iTrader: (6)

you are making WAY too big of a deal out of the mid range loss. chances are that if you are a person who doesn't push your car hard and drive normally, you won't even notice the midrange loss. You can barely feel it and after a week, you won't even notice it.

NmexMAX

iTrader: (22)

No one has yet to find a way to get better midrange with the MEVI besides an upgraded ECU.

So whatever you do, it'll be the first. There have been a few members that have wanted to try something but it never got completed.


Where have you found a MEVI? From my understanding these things are becoming quite rare, therefore the 00VI is a more attractive choice.

I can honestly say that my A32 felt better from 6k+ than my stock A33B.

zander

iTrader: (2)

Since I have a MEVI I'll talk about that. Midrange is the only noticable loss, I noticed quicker response from a stop, but then its just smooth till redline, where I feel a decent pull. I have a stock ecu so no extended rev limit, but you can really tell the thing is about to explode at redline. What you loose is the power "boost" feeling you get with the USIM in the midrange. Without the extended rev limit you will be just as fast, maybe a little faster at high speeds. The car likes to rev out 2nd and 3rd alot more now

chillin014

iTrader: (67)

i just dont like the fact that you have to pay more money to MAKE UP for lost horsepower. that just seems like the wrong direction to me, or sort of a back-track. i mean, if you lost horsepower and you buy an ecu to gain it back, your really not that much more powerful than you were stock, right? just how it seemed as i pondered it.
maybe its just a preference thing as far as where you want your strong point to be in the power band?

btw anyone know where the 00vi how to sticky went?

NmexMAX

iTrader: (22)

Try 40+ Whp at and above 6.5k.

chillin014

iTrader: (67)

oh wow....i just wish you didnt have to pay the extra 500 to get there (for the ecu).

NmexMAX

iTrader: (22)

You don't, you'll still be making 40 whp more than USDM... @ 6500


If there's any question, just get the 00VI and call it good.

chillin014

iTrader: (67)

my mistake.
well i'll toy around with maybe both if im fortunate enough.15 second track times will not fly with me.

pod97654

iTrader: (13)

well i am going to be spending around 400 for the MEVI kit, and if i have to spend another 500 for the ecu to make power, that 800+ for this mod. what is the going rate for the 00VI swap? and is it a more involved instlation wise?

chillin014

iTrader: (67)

I would do the ecu first, as long as you don't have to get it reflashed for changing intake manifolds.
I have seen the 00vis go for not much more than mevi's on the org.
But either way I think you could get an 00vi hooked up for well under 800 and not feel obligated to get an ecu to compensate for the lost power.
You have seen the dyno comparison, right?

s0ber

iTrader: (7)

the power up top at 6.5 with just the VI is sufficent, the ECU would be a big bonus for the 7200rev limit and whatever timing advance you might get...

I'd <3 the 7200rev limit with my VI right about now.

chillin014

iTrader: (67)

Do you have mevi or 00vi?
I think if I found a cheap mevi I'd go ahead and jump on it.

pod97654

iTrader: (13)

it's not cheap if i have to rev the **** out of it to make the power, or if i have to spend the extra $500 for the ecu. I have seen the dino comparison, but to be honest their very close and I think it would be hard to say which is better after alot of motor mods are done. I know why the MEVI makes more power, but i don't think anyone has ever explaned the 00VI to me. i don't know what it does to add power, let alone more power then the MEVI.

chillin014

iTrader: (67)

i agree. i meant without the ecu.
on the dyno, the upper end is just way above the usim, kinda has the same line parallel to the 00vi.

zander

iTrader: (2)

The car feels alot better with the MEVI, I don't regret getting it one bit, and besides the MEVI I am completely stock. 800 bucks for 40-50 hp at redline? not worth it! Are you kidding me? Try getting that much hp out of any other mods and find out what it costs. What does a supercharger give you, a hundred? and costs... upwards of 3000, so each hp costs 30 bucks, where the 50 hp for 800 is 16 bucks per hp. And if you get the ecu have fun struggling to your new redline.

chillin014

iTrader: (67)

wher would you say the main power increase is without an ecu? 5k+ ?
and then you lose some midrange...
would you say that OVER ALL, taking the midrange advantage of the USIM into consideration, the mevi is a better intake manifold?
cause the power besides the peak (called under the curve, right?) is important too.

zander

iTrader: (2)

With the extended rev limit you will have more power under the curve. The ecu upgrade compensates for the "loss" of midrange that you notice when you go from a USIM to a MEVI. So with an ecu your car *should* pull as hard as the USIM in the midrange but instead of dropping off it will continue to pull to your now extended rev limit. And your shift will drop you higher in the midrange so you will be making more power after every shift. Which is the main reason I want the extended rev limit. Right before it shifts there is a consderable spike in power and just after it switches its kinda slow for a couple hundred rpm, if i can avoid this "dead spot" I think the car will pull like a bat out of hell. Right now top end is alot of fun. The MEVI opens at about 80-85 in 3rd and the sucker takes off. I guess I am just really impressed with the top end of this car as opposed to my last car, which would probably hang 0-60, if not pull a little

chillin014

iTrader: (67)

So the 00vi does as much and then some compared to the mevi+ecu
So the 00vi is a good 50 hp gain at top end and still gains at mid range too.

pod97654

iTrader: (13)

I am just starting to think now that the 00VI is the better way to go, judgeing by the dino test you gain more horsepower with less cost. i am still looking for someone to explane why the 00VI makes power over the USIM. and to give me an idea of what it takes to install the 00VI. And a general idea of the cost of the 00VI.

chillin014

iTrader: (67)

Alright sorry for the thread "*****".
I agree, 00vi is lookin good.
I'm also curious if gains are different if you use just the top end or both the bottom and top of the 5th gen intake mani.

DandyMax

iTrader: (7)

00VI = better runner/plenum design, smoother material (better air flow)

Not trying to be a jerk, but honestly there have been many threads on the 00VI swap in this forum so don't expect anyone to re-post all in detail now. Read back through some of them and you'll have a very good idea of what has to be done. You don't even need to be able to search, most of them are on the first few pages going back to last summer/spring.

But if you really need to search go to google, type in your search terms and then add the site tag. For example "00VI site:forums.maxima.org"

pod97654

iTrader: (13)

yea, i would really like to see a comparison between the full 00VI and just the upper plenum. has anyone tryed this?

clive

Like someone said earlier, it's a matter of resonance physics. It looks to me as if the USIM tube lengths are all the same; this will mean that at certain frequencies, notably 2300/4600 there is an adverse effect ('flat spot') and at other frequencies (3400/6800) there is a positive effect. The dyno curves for the USIM vs MEVI seem to confirm this in practice. If you look closely at the MEVI you will see that each tube seems to be a little different in length from the others.
Speculation and may be pure bs.-
I'd guess that the equal length tubes of the USIM are subject to 'organ pipe effect' causing pressure nodes and antinodes to appear in the tubes at different positions according to the rpm (frequency). Actually there are standard formulae available for calculating the resonant frequencies of pipes and it might be interesting to do that and compare the result with the dyno curve.
I'd also guess that the unequal 'variable' length tubes of the MEVI act so as to spread out the resonance effects into a broader range and spread the power more evenly across the rev range. It's not that the MEVI causes a loss of power, it's more that to achieve a wider power band, you have to forgo the extra boost the USIM provides when it hits its resonant spots.

NmexMAX

iTrader: (22)

The tubes that are visible are identical to the USDM, and the chamber where the 'dynamic supercharging' occurs is the only difference, as well as what's in it.

Clive, you need do to a little grunt work in finding OLD, (02 era) threads where this has been explained (how the USDM differs from the MEVI, and how the MEVI gains its high RPM power)

Stop spelling it like that please.

Though it's still the same concept as MEVI (not a true runner either).


I have said this before in this thread and will do it again....with a slight edit.


You need to read the write-ups and study the detials of the install a little bit more closely.

pod97654

iTrader: (13)

Wow thanks NmexMax, that answers most questions i had. but i guess this is going to be a option, but would the 00VI be the best mod for the money, when i comes to maxima's?

scrhale

OMG ... this is not a hard concept people. The 3.5 swap and 00VI are known to be the best bang. You just have to be willing to tear some &^$* out of the engine bay, get dirty, and do the research.

pod97654

iTrader: (13)

Picking up a wrench is not my problem, I have no isues with getting dirty, I consider this research. i know it has been talked about alot in the past, but it is nice to hear the input of people have have done these swaps more recently. plus Theads like this keep this knowledge curent for all the people that have not had their maximas since new. Sorry if theads like this frustrate you i am sorry, but the simple solution is not read them. But but i would like to thank all the long time maxima guys that are willing to repeatedly share their experance with the new guys.

zander

iTrader: (2)

Oh and a little tip I found out this last time, take off your IACV! it makes access to the rear bolts alot easier, like egr and the two support bolts. This might be common knowledge but it really cut my time down in switching manifolds. You have to take it off anyway.

boostlogic

iTrader: (2)

The 00VI owns. You don't feel a loss of power over stock, but when that baby opens it feels like a runaway train.

MaxGordon7

iTrader: (36)

damn i want your 300z that thing looks bad asssssssssssssss

nismology

iTrader: (8)

You seem to know the theory inside and out but in this case you're kinda way off.

nismology

iTrader: (8)

Stop putting so much stock into the 40 HP at redline business. That means nothing. What you should be looking is the average HP gain and area under the curve. Mod for mod and with equal drivers, a USIM maxima will spank a MEVI maxima til about 80-ish or so, where the MEVI maxima will pull. Because the MEVI makes less power than the USIM until about 5500 RPM. I'd get the 00VI just for that fact alone.

And the supercharger upgrade gives you more area under the curve than any n/a mod combined.

nismology

iTrader: (8)

The loss of mid-range torque is due to where the butterfly valves are positioned. They don't sit flush with the runner and the space between the runner and valves causes there to be a pocket of turbulent air. If someone could make the valves flush the mid-range characteristics would be much improved, im sure.