well, i came to the car this morning and my VAFC reset for some freakin reason. I would be ok with it but I didnt write down my settings when I got it back from the dyno so all that work is gone . I know the basics of its setup, but do not know proper way to tune. For the time being I just wanna street tune it and want to get some help. Motor: b18c1

I have these mods:

IHE
Crower Stage 2's (402) with stock rev limit
some stupid underdrive pulleys
a fuel pressure reg set to about 48psi
and I think the cam gear timing has been modified


My past vtec point was at 5500 and the fuel map I kind of remember and mimicked it for now. I have no 02 wideband so its kind of hard. I dont want to cause damage to the motor.

WHAT should I do???

 

bump

 

Did a tuner tune the car for you? If so, I would check with the tuner first, hoping that he might wrote down the setting for the VAFC. If not, then going back to the dyno and retune the car is the best thing to do.

If you are planning to street tune, I would first set the fuel setting all the way up (running rich), then work your way down with the wideband you have. Since you don't have large aftermarket injectors, you don't have to worry about washing out the rings. By tuning the car this way, you don't risk your motor from running lean and start melting and detonating the motor.

But before you do any of this, please check your wiring on the VAFC. The VAFC shouldn't reset by itself. It's either faulty poor wiring or the VAFC iteself is faulty.

Hope this helps.

 

wow thank you, now in terms of the graph, it is set at a flat line at the wide throttle setting. There is a HVT and LVT settings and I kind of mimicked the LVT but not HVT from the past setup. When you tune, where is most fuel added, what happens aroudn VTEC???

Eddie

 

It's very hard to describe how to tune the car with the VAFC, but the general idea is to tune the fuel first, then the VTEC crossover. When you finish tuning your air/fuel to stoich across the rev range (including VTEC crossover), then fiddle around with the vtec crossover point. There's no way of telling what the optimum VTEC crossover is if your fuel map is all over the place.

Once you've dialed the air/fuel properly, if you feel a big rush of power at VTEC crossover, then VTEC comes on too late. Meanwhile, if the car bogs at VTEC crossover, then the VTEC comes on too early.

So the sequence is:
1. Tune your air fuel to stoich across the rev range
2. Feel the VTEC crossover (rush of power or bogging)
3. Set VTEC crossover.
4. Tune air fuel to stoich
5. Repeat 2-4 until you feel the power is linear and the air/fuel is at stoich

Hope this helps.

 

wow that is the exact response I was looking for, hahha, your amazing.

Thanks,

Eddie:

Anymore info would be great . Think I can rent a wideband 02 to watch my fuel haha.

 

Now, if I change the VTEC cross over, then I need to change fuel maps to compensate the rush of air from the switching over of the high lobs. As well, there are ne4000, ne5000 corrections which I dotn know. I want to run it safe for now you know.

Eddie

 

and finally haha,

My controller wont let me go fromt eh low cam to high cam vtec engagment lower than 5400 which is confusing me???


Eddie