MiVec Controllers

[Muad_dib77]

Lads - I'm considering getting a MiVec controller..

does anybody know if all the Apex-I models will work with Mivec engines..
I see manufactures Like Buddy club and RS-Racing specialise in Vtec only.. Their products look to be inferior anyways (box with dial on it...could just be a varialbe resistor for all I know )..

Anybody with any info?

[Myfeckin FTO]

Don't see the benefit of one TBH - money better spent on other mods. The mivec point is already set at optimum - moving it around is more likely to negatively effect performance.

[Muad_dib77]

Now are you talking Performance as in Power regardless of fuel consumption..or as in power per unit of fuel consumed?

My understanding of the MiVec & Old (proper) vTec system was that it was a Performance optimising measure..in that it only lets the engine give out full whollop when it's needed..(as in over a set number of revs) - but surely if one was to change the number of revs at which to engange full whollop - one would get more bang going on....

I do appreciate that on a daily run one of these lads wouldn't have much use (other that disabling your restrictor) - I also understand that there may be issues such as part wearing out faster and stuff...

But surely if one was to have say an economy setting for sitting in traffic - and a boyracer setting for cruising up and down my private track (u remember the one I have in my back garden here ) - it would be a bit of crack...

It mightn't make too much sense, but hey - could be fun....

Have done a bit more reading on the topic apparently you're lucky to get 5bhp increase from one of these yokes... Dammit anyways...

Also saw CJs post in a different thread about remapping the ECU..

Its not possible to get the standard ECU remapped, you have to get something likes a Mines ROM that will set up back over a grand, its unlikely it will net 20bhp though. I had a Racelogic VSAM on the GPX, its a piggy back unit, on the rollers the power was actually down with the thing in place. Remappable ECUs are only worth getting if you've a turbocharged car, theres very little gains to be had on an NA engine.

CJ

Back to the original question - does anybody know which of these controllers will definately work with a MiVec engine...

[soc]

Russ has a mivec controller AFAIR

[Myfeckin FTO]

.........Back to the original question - does anybody know which of these controllers will definately work with a MiVec engine...

Most of the Apexis seem to suit the VTEC signal as opposed to Mivec but you can get a mivec adaptor - some like the Apexi S-AFC will work out of the box for the mivec - see here for options on controllers -

http://www.mitsubishi-fto.org/parts/ele ... index.html


However just to elaborate on the previous point - it will work in that you will be able to move the mivec point around a bit - but whats the point in that - if you reduce the mivec point to say 4000rpm then yes I would imagine you'll have more power at the 4000-5500 power band but you'll have a lot less top end power in the 6000-7500 power band and thats where you'll want the power most if you're looking for max performance.

If you increase the mivec point to say 6000 then the engine will have a very short max power band and you'll have a noticeable lull on gearchanges while waiting for the mivec to come back on song.

As for fuel economy - well unless you're living in the 5500-7750 rpm power band then its not going to make any difference and if you're living in the mivec zone then economy probably isn't going to be an issue for you anyway.

Leave well enough alone - sort out basic mods first like induction,manifold and downpipes - decat SS exhaust, Iridium plugs, fuel pressure regulator and maybe upgrade the fuel pump and then it might make sense to get an Apexi S-AFC or similar so that you can adjust air/fueling etc.

[RussMan]

Hi there... Soc's right i've a mivec controller on mine...
To be honest i've played around it for ages and it has made no positive inmpact on fuel consumption regardless of where i get the mivec to "kick in" as such.

The cool things however are being able to get it to kick in at 3K RPM just for crap and giggles .. the noise is pretty crazy...
Other cool options with mine are a digital speedo and tach... i.e You could view over 180 Km/h if you were on a track for instance.

If you want a look at mine let me know sure.

Russ

[Muad_dib77]

Hey man - that would be absolutely awesome..
Where abouts are you based?

Any chance of a bunch of pictures...
&
Did you test the delimt on (of course the track or closed road) ?

[sp8ced22]

the New Apexi Neo is a good option especially for getting the car set up perfectly and allows adjustments afteryouve made mods to the car, and does allow you to change mivec point but as directed not worth doing as its at the sacrifice of power the only time ive seen the mivec point moved was in a turbo application if i recall it was moved to sumik like 2000rpm

[CJ]

Personally, I wouldn´t bother with a controller, there are minimal power gains to be had if you move the MIVEC point UP the rev range to approx 6.5k rpm (if you move it down, you lose power), gains have been recorded in the range of a couple of bhp. Digital tacho and speedo would be useful alright. I played around with a controiller a few years ago (had to manually splice it into the ECU, tricky work) but ended up sticking it on ebay soon afterwards...

CJ

[RussMan]

Live near where you work Muad..... sandyford area. More than welcome for a look in 2 weeks when i get her back fresh with new alarm + remote start!!! yaaay.. will post some pics soon... car has done over 210 km/h not sure what limit is.. perhaps less than that????

[Muad_dib77]

Limit is 200kph so if yuo've been past it - the ypu it's working

Awesome With a bit of luck I should have my baby back on the road in two weeks time as well., YAY!!!

[Bernard]

Limit is 200kph Smile so if yuo've been past it - the ypu it's working Smile

I thought it was 180?

Bar the obvious, how can you tell if it's de-restricted?
Not that it makes a difference to me but just out of curiosity.

[sp8ced22]

it goes faster dont know what it is in KPH but in MPH it hits the limiter at 112mph and then yopu loose all power, mine is delimited and ive had mine up too 143mph (on a race track ov cource) on my standard rims and speed was verified by sat nav

[Muad_dib77]

In some FTO there's a even a kick from the pedal - I know first time I hit the limit in mine I was quite shocked - a very unpleasant feeling if you're not prepared for it..

Car kinda goes.,., "RumbleRumblesplutterrumble" while shaving off speed.. A real pisser if you're bombing it downhill somewhere private..

If you put your mind and foot to it - you can be on the limit faitly quick in - and there's definately power to spare.. I'd love to see what sort of speeds the FTO is capaable of with nothing to hold it back...

[sp8ced22]

In some FTO there's a even a kick from the pedal - I know first time I hit the limit in mine I was quite shocked - a very unpleasant feeling if you're not prepared for it..

Car kinda goes.,., "RumbleRumblesplutterrumble" while shaving off speed.. A real pisser if you're bombing it downhill somewhere private..

If you put your mind and foot to it - you can be on the limit faitly quick in - and there's definately power to spare.. I'd love to see what sort of speeds the FTO is capaable of with nothing to hold it back...

on my 4 speed tip i got to 143mph and ran outa road i still had 1.5k left till red line and speed was still increasing allbeit slowly gestimate would be 160mph (in a tip - longer gearing) and this was when my car was standard

[stevec]

Just did the maths on this:

standard 205/50R16 = 1921mm / rev

F5M42 manual geabox, 5th = 0.820
Diff final ratio = 4.312

works out at 0.543m / rev in 5th

8000RPM = 480,000 revs / hour x 0.543m
= 261000m/hr = 261kmh = 162mph



havent a clue if I worked this out correctly but the figures seem to match the max performance in lower gears - however the ratios in the book for the tip box don't make sense, there must be something I'm missing.

Calculated@8000rpm: FTO Handbook:
1st- 60kmh 55kmh
2nd- 110kmh 105kmh
3rd- 155kmh 145kmh
4th- 208kmh 180kmh