vafc setting for dc2 r

[brucelee]

hi does anyone got the vafc setting for dc2 r?? I have change the vtec crossover point (Lo>>Hi) at 5200rpm and (Hi>>Lo) at 4800rpm, but it still doesn't change the kicks in point. I still kicks in at the factory setting which is around 5600rpm. also, does anyone got the good setting for the Wide Thr and Narr.Thr?? and what's the difference between them?? can anyone help?? thanks

[McChook]

have you wired it up or just stuck it on your dashboard??

[brucelee]

I surely wired it up coz it gives the response at revs, fuel enrichment or pressure..etc but just can't change the vtec point dunno y!!

[BLKCRX]

How are you testing is vtec is engaging or not, remember just because you lower the VTEC point dos’t mean you will lower the “kick” you feel, setting the vtec point correctly needs to be done on the dyno, every engine is different and can require complete different settings, I see this every day in the many Honda’s I tune.
Like wise with your air fuel settings, there’s NO general setting, and I would highly advise agaist coping any settings off anyone, this could do massive damage to your engine.

The VAFC is a interceptor device, it changes the out put signal of the ECU to either supply more or less fuel at 6 different RPM points. The only problem with this is the ECU has a self feed back mode where it can detect a small change in the fuel output measured from the o2 sensor before the cat and can alter the fuel settings directly form the ECU and so called “reset the car back to how its ment 2 be running from factory” using someone else’s AFC settings might be way off compared to your settings do to the long term or short term oxygen settings in your ecu.
In summary you need to get your car dyno tuned to find out what your engine is doing, but yes even your ECU after a while will adapt and change and revert what ever you tune into you AFC back to stock.

Regards James

[McChook]

when the engagement point is "changed" it turns on HiCam at a lower RPM, but the HiCam doesn;t make any more horsepower, infact the HiCam makes less horsepower until 5500RPM. There is no point changing the Crossover point, as hicam will make less power until 5500RPM, when it reaches optimum efeciency

[BLKCRX]

not always the case there's not magic limit such as 5500 sometimes i set the vtec point as low as 3000rpm and sometimes as high as 6100 so every engine is different.

Regards James

[brucelee]

I checked the vtec engagement point via the vafc. Coz when the vtec kicks in, the vafc's VTi will show 'ON' from the screen. but the point here is even i changed the vtec crossover point, the vtec still kicks in at 5600rpm. Here is my vafc setting see can make any difference:
the vtec crossover point: Hi<<Lo 5300, Lo<<Hi 5000
The wide thr: 1000rpm - 3000 rpm = -3
3000 rpm-4000rpm = -2
4000rpm -4500rpm = +1
4500rpm - 5500rpm = +2
5500rpm - 9000rpm = +3

The narrow thr: 1000rpm - 3000 rpm = -3
3000 rpm-4000rpm = -2
4000rpm -4500rpm = +1
4500rpm - 5500rpm = +1
5500rpm - 9000rpm = +2

The vtec unmatch both in Hi<<Lo and Lo<<Hi = 0

any suggestion on these??
but the point still dunno y is vtec corssover point doesn't change

[UR2L8]

Did you put it in yourself? Id recommend you go to a tuning specialist place to get it done right. And stock Vtec engagement is 5800rpm Low-High for the dc2R.

[VTEC16]

.....most of the settings iv seen with a VAFC have been leaned out at above 5500 (on full throttle)...rather than richened.....not saying that this is right for your engine...but make sure its tuned properly.

[IRI]

Factory setting Hi>Lo at 5600rpm? Something must be wrong with mine cos my Vtec doesnt engage until about ~6400rpm.....

[UR2L8]

Just remember, if you got a stock motor and exhaust then Vtec engagement isnt that noticeable, its more of kind of a smooth trasition into Vtec, Aus spec ITR will engage at 5800rpm but you will prob feel it around 6100 or so. So dont panic:)

[IRI]

But its definantly noticeable, as soon as it hits 6400-6500rpm the front wheels just about break traction....

[UR2L8]

Yeah in 1st. Just get it fitted by specialist who got a dyno thats all. You will spend more but at least you got peace of mind and you wont run the risk of damage to your engine.

[brucelee]

thanks for the reply from u guys. my vafc was firstly installed and tuned up by the specialist. I then read tons of mags and technical staff. I then had little knowledage or I can say tricks for setting this up. hope u guys can correct me if I'm wrong. I knew that for more general setting (mainly for street use and street race) u can reduce fuel supply from 1000rpm to 4000 rpm as increase the low end torque or foucus on saving pertol, but while the vtec's in, u need to enrich a bit (around +1) for the vtec starts period, I mean the high cams starts in. when the high cams fully in, then it's better off to give more fuel ( as I set it up +2) to increase the vtec performance. however, what I'm saying here is for street use. But when ya go for race, then it would be full throttle, then the fuel supply would be a bit more then half throttle, that why I set it as + 3 (the vafc indicates this as narrow throttle). but I am still trying to make the point here. I had no idea y I can't change the vtec crossover point. also, even I read some mags and technical, but I still dunno what;s the function of vtec unmatch point, or I can say I made confuse in this part. anyway, all above just what I think. still lookin' any good one around to correct all this.

[BLKCRX]

To cut a long story short leave your car tuning to a professional, with the correct tuning tools, lambda meter, there is NO SUCH THING AS A GENERAL RUEL FOR A ENGINE, that’s the largest load of crap iv ever hurd.

Every engine works performs differently, your ECU will automatically lean off or richen your fuel for ANY settings you make, and you can not stop this from happening, ie you car will ALWAYS go out of tune and you will always need to add more or less fuel, but unless you have the correct tools knowledge and understand everything 100000% don’t try this at home ! you most certainly can not use settings or recommendations from others, others posting information like that don’t understand the fundamental differences between every engine and even every Stock ecu.

Regards James

[vti-2]

Why do you want to change the VTEC point?

[brucelee]

coz the optimum performance point for vtec is around 5200, I'm not sayin' the factory setting is no good but just same as the example like why ppl change their sussy, it doesn't mean factory sussy is no good but just wanna get better performance or result.

[ATSE]

Who says the optimum performance point is 5200???? Unless you dyno it... you cannot determine which point is optimum or not.

[vti-2]

Who says the optimum performance point is 5200???? Unless you dyno it... you cannot determine which point is optimum or not.

Exactly what i was getting to. I've never understood this fascination with changing the VTEC crossover point. VTEC engines come out of the Honda factory optimally tuned anyway, so unless you are careful with the modifications you do, you don't really gain that much in performance, in particular with changing the VTEC crossover.

Either way, good luck in your quest.

[brucelee]

as I said from the beginning of this post, my vafc was installed by the specialist at that time and dyno my r after that. I know every cars different but the dyno result did show the optimum point was around 5200rpm. and that y I wanna change the crossover point but the problem is I can't change that via the VAFC.

[vti-2]

Are you in Melbourne?

[brucelee]

Are you in Melbourne?

no i'm from syd. what's up?

[vti-2]

If you're in Melbourne, could have suggested some workshops. Nevermind.

Let us know how it all goes. I'm interested to see the results.