So with your 80% load VTEC activation at 3900-9500, if you come down to say 4500 at 50% load will VTEC then be disengaged?

 

Yes, under 5500 RPM (irrespective of load) it will disengage the high cam after it's been engaged.

Under 6000 RPM, VTEC follows the minimum TPS threshold.

The idea of this feature request was to enhance VTEC operation - not to make it worse.

 

I've decided that 2 months worth of trimming is enough. I've spent so much time on this now and I'm finally satisfied with the performance. The drive feels fantastic under WOT and daily driving. VTEC changes by ME have been the missing touch that was needed to truly make this an all around package that's better than OEM. It's there now.

I'll post the map when I'm back home (in London this week) for others to reap my efforts. Narrowband will be reinstalled and needing to drive will become the sole purpose of driving - not driving to mess with the ECU!

 

I made some final tweaks to the ignition table and got a little knock ~3400 RPM. Timing dialled back and it knocks no more. The new column at 1800 RPM has made a big difference down low by not relying on interpolation between the 1500 RPM and 2000 RPM columns (1500 RPM column was replaced with 1800 RPM). Otherwise, the overall final adjustments have been taking place. With the disablement of LTFT, I have re-enabled acceleration enrichment and this has required a little tweaking from the base map values. I've got it going pretty damn smooth, though. I've also been running with lambda control disabled to test the accuracy of VE tables (to ensure lambda control isn't masking something) and it's performed flawlessly.

Next steps will be driving the car for a week or two in various conditions. If all goes well, I'll be re-installing the narrowband and having many happy miles of driving.

You can map/tune your own ECU; don't let anyone tell you otherwise!! The difference between the "tuner's" map (which took an hour to do) versus my own map (which has taken about 20 hours) is insurmountable. I drove them back-to-back and must say that I feel a great sense of pride having not only done the deed but having also done it better.

 

Good job
But why are you changing back to the narrowband?

 

The wideband has a lifespan. I would like to keep the sensor for future projects or needs rather than let it sit on the car running in "simple" mode (which isn't all that different to narrowband functionality) until it eventually burns out. Then I have to buy another one and the cycle continues. The narrowband I removed was working just fine and likely has many years left in it.

I don't see the benefit of the wideband in normal driving/track scenarios. I'll know something is wrong before I see it on my device which I won't have connected 24/7... Cars are for driving, not for staring at gauges.

 

A new genuine narrowband sensor is more than double the price of a Bosch LSU 4.9 and I don't see why the wideband would burn out any faster?
If you want to do a quick check or alter the tune due to whatever reason it's pretty neat to have the wideband already connected.
I've been running on just the wideband for a few years now without any problems, so just a suggestion

 

You make a good point but if I need to alter the tune without making any changes then I haven't done it very well to begin with... (And I'm not planning any further changes).

I can get a Bosch LSF 4 narrowband for £20 or so on trade discount. Simply cut and crimp the Honda harness connector onto it and I'm off again. Can't get the widebands cheap, unfortunately.

Of course, there's no certainty that the wideband is going to die anytime soon; I just don't want the unnecessary cost of replacing it from usage when it was no longer serving a purpose.

 

Hi guys,

Been a while since I've last checked the forum. The enhanced VTEC has been a long time coming and happy to hear it's doing its job. Any question or feedback you might have, feel free to PM us or drop it here.

Cheers,
Alex

 

Sending you a PM