I've been lucky enough to get the chance to try out a genuine Mugen N1 ECU for a couple of weeks (4700rpm vtec x-over and 9100rpm rev limiter).

I currently have a VAFC connected to my stock ECU. I have a couple of questions regarding that:

1.
Should I reset the VAFC after changing ECU, or will it reset itself?

2.
Will the VAFC automatically detect the 4700rpm vtec x-over?

3.
Will I now be able to alter the vtec x-over and fuel settings with the VAFC with no problems (as with the stock ECU)?

 

Ive been running the same Mugen N1 ecu in my JDM B18cR hybrid civic for 8 months and all i can say is i hope you like filling up with gas !

The ECU is for fuels of 98 RON or higher or forget using it. Also, its very thirsty and id recommend a new fuel pump if u havent already and get ur fuel pressure up to 50PSI

But apart from that, The VAFC is useless with the N1 ECU. it wil only interfere and **** it off.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mugen Civic Type R &raquo;</TD></TR><TR><TD CLASS="quote">
The ECU is for fuels of 98 RON or higher or forget using it. Also, its very thirsty and id recommend a new fuel pump if u havent already and get ur fuel pressure up to 50PSI
</TD></TR></TABLE>

We get 98 octane here in Europe so no problem. From what I've read numerous people have used this ECU with stock fuel pump with no problems. So I don't think I'll bother getting a FPR or a new fuel pump.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mugen Civic Type R &raquo;</TD></TR><TR><TD CLASS="quote">
But apart from that, The VAFC is useless with the N1 ECU. it wil only interfere and **** it off.
</TD></TR></TABLE>

How do you know that? Have you tried using a VAFC together with the Mugen ECU? Be more spesific please.

 

i used a spoon ecu with the vafc. the vafc will not automatically detect the mugen ecu, it will put the vtec crossover point at the default 5700 rpm point. you will have to reset the vafc vtec crossover point to the lower mugen rpm point, assuming you want it that low

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by an2ny888 &raquo;</TD></TR><TR><TD CLASS="quote">i used a spoon ecu with the vafc. the vafc will not automatically detect the mugen ecu, it will put the vtec crossover point at the default 5700 rpm point. you will have to reset the vafc vtec crossover point to the lower mugen rpm point, assuming you want it that low</TD></TR></TABLE>

Thats a roger .

If I do change the vtec x-over to say 5000rpm, will that cause any problems for the ECU? I mean, does it know what timing and fuel settings to use from 4700-5000rpm when running on the low cam?

 

i'd suggest going to a good tuner in your town and have them tune your vafc to run in harmony with the fuel/timing curves of your chipped ecu..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Pompiuses &raquo;</TD></TR><TR><TD CLASS="quote">

Thats a roger .

If I do change the vtec x-over to say 5000rpm, will that cause any problems for the ECU? I mean, does it know what timing and fuel settings to use from 4700-5000rpm when running on the low cam?
</TD></TR></TABLE>

I would imagine that the Mugen ECU would not skimp out and still have a low cam map passed their preset vtec crossover in the case you are past it but aren't "on it" with the throttle. Like how OEM does not crossover into vtec if your engine is cold or you are at low throttle.

Of course this is adjustable with the VAFC too... it is the one that decides when the vtec signal is sent... If you set the VAFC to have VTo and VTi displayed, you have a way to compare what the Mugen ECU wants and what the VAFC is giving...

edit: for some of your original questions posted, yes, you would probably want to reset the VAFC (after writing down the old settings in case you ever need to go back) for the new ECU since the "fuel settings" are based on tricking the ECU it is connected to into applying more or less fuel in relation to the ECU's own map (i.e. it is not injector duty setting, so it changes with ECU). The old settings will not be correct for the new ECU. yes, you will be able to change fuel, but likely will need a new tune/settings.

 

I have a Mugen N1 ECU for sale (B16b CTR). See my For Sale thread in my sig. Price is OBO. You should not have any problem at all using a VAFC w/ that ECU.

Zach

 

Interesting that I'd come back from somy dyno and highway testing of a Mugen ECU with a VAFC.
It's also a bit of an eye opener, since I'd just had an AEM wideband installed to get some idea of how everything was working and with which to base some VAFC correction upon.
I've got some mixed feelings about it at the moment since the MMugen has some particular ideosyncrasies which make it go very lean at little or small throttle openings.
Made some defininate prigrass today with Jacks help so I'm good to go at wide open throttle situations like on the track, but I may be looking for a programmable ECU when I can afford it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by zygspeed &raquo;</TD></TR><TR><TD CLASS="quote">Interesting that I'd come back from somy dyno and highway testing of a Mugen ECU with a VAFC.
It's also a bit of an eye opener, since I'd just had an AEM wideband installed to get some idea of how everything was working and with which to base some VAFC correction upon.
I've got some mixed feelings about it at the moment since the MMugen has some particular ideosyncrasies which make it go very lean at little or small throttle openings.
Made some defininate prigrass today with Jacks help so I'm good to go at wide open throttle situations like on the track, but I may be looking for a programmable ECU when I can afford it.</TD></TR></TABLE>

Do you mind telling what settings you got with the VAFC? Like Hi and Low vtec engagement (I was thinking setting Low to 4600rpm??), and at which rpms you add/subtract fuel.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Pompiuses &raquo;</TD></TR><TR><TD CLASS="quote">Do you mind telling what settings you got with the VAFC? Like Hi and Low vtec engagement (I was thinking setting Low to 4600rpm??), and at which rpms you add/subtract fuel.
</TD></TR></TABLE>

I'll go copy down the settings this afternoon and let you know.
Still have an idea or two to try once I figure out how to adjust/use the VAFC myself

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by zygspeed &raquo;</TD></TR><TR><TD CLASS="quote">
I'll go copy down the settings this afternoon and let you know.
</TD></TR></TABLE>

Thanks, that'd be great .

 

I had a similar setup. I used a JUN ECU with a VAFC. The VAFC works just like with the OEM ECU. Basically, whatever mapping and setup your N1 has will be altered by your VAFC. This can actually be to your benefit as I saw +6whp by fine-tuning my JUN with the VAFC. However, if you cannot tune on a dyno, I suggest you re-zero your VAFC and use it as a monitor or to play with the VTEC engagement. Otherwise, you can actually lose power.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by zygspeed &raquo;</TD></TR><TR><TD CLASS="quote">I'll go copy down the settings this afternoon and let you know.
Still have an idea or two to try once I figure out how to adjust/use the VAFC myself</TD></TR></TABLE>

I'm about to install the ECU soon . You've got the settings yet?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Pompiuses &raquo;</TD></TR><TR><TD CLASS="quote"> You've got the settings yet? </TD></TR></TABLE>

I've barely begun to read the VAFC manual yet, sorry.
However, I'll be out in the car in a few hours and see what I can come up with even though its been raining all day so far, this way.

Lastly, the settings Jack came up with were mostly to accomodate some apparent lean-running situations around 4K rpm, at light throttle inputs ... with a correction of about +23% at that point with a rather high fuel pressure setting (I'd guess 65+ psi). So, I'm not really sure I'd recommend the particular settings or setup that I'm running at present.

In either case I'll try and have something for you in a few hours and will IM them to you. Ed

 

I've now installed the Mugen ECU. Just for future reference ; I set vtec in at 4700rpm on my VAFC, and vtec out out at 4600rpm. Seems to work fine .

I don't think I'll mess around with fuel settings. It seem to run a bit richer when in vtec, and about just as lean as the stock ECU when not. My fuel consumption did not increase noticably after installing the ECU.

The car definitively pulls harder now. Low end throttle response has improved a bit, while car pulls harder through vtec. Now I'm shifting at about 8700-8800 (real)rpm (9000 indicated), and it seem to work better than shifting lower. Overall I like the ECU.

My mods are I/H/E and 8,5lbs flywheel.

 

Having done about 600 miles on the highway in the last two days, swapping stock and Mugen ECUs, watching the A/F on the wideband and working with the fuel pressure ... I decided to disconnect the VAFC and left the fuel pressure at about 58 with the hose on.

Tomorrow, cornerweighting out at King Rat Motorsports.

 

I'm about to have a Spoon ECU installed on the newly installed JDM B18C ITR.

So you think the same will apply to installing a Spoon ECU if I get the V-AFC? I'll have a similar setup as Pompiuses.

 

the same would apply to any aftermarket ECU being fitted to a car already running a VAFC.

 

is it possible to rev up to 9,100 with the Mugen ECU with stock internals? maybe just: intake, headers, exhaust and high flow cat?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by old_school_dohcvtec &raquo;</TD></TR><TR><TD CLASS="quote">is it possible to rev up to 9,100 with the Mugen ECU with stock internals? maybe just: intake, headers, exhaust and high flow cat?</TD></TR></TABLE>

I did w/ no problem on my B16b. I only had one header though

 

hi...may i ask more about ecu? it seems to me you are very preparated....if you use yahoo messenger,we can chat there...ty very much

 

The thread is 2 yrs old