Interesting about the VTP needing to be active. On every run, the moment VTS engages, VTP drops off (disables) and when VTS disengages, VTP reactivates (enables). You are saying they both need to be simultaneously active? If so, that's not the case at all from the datalogs. The plot thickens for sure. VSS looks good, though. The datalogs show that it is registering speed signals. What should the minimum speed be set to for VTEC engagement? My understanding is that having the Engage and Disengage Speed set to 0 meant that it doesn't require it to engage VTEC. So, I have it at 0, as you can see from my first post on the 4th image.don‘t know for the Ktuner, but on KPro or Doctronic ECUs for the older K20a2, you need a minimum speed for VTEC to engage. VTP also needs to be active for the switch to be triggered. No VSS speed signal, no VTEC. This is until you disable the use of the VSS sensor.
On my K20a2 build, VTP is active from as litte as 3000 rpm. You can log it and it being shown on a graph.
This is true even when TPS is maxed at 80%, though. If you look at the other datalogs I've pasted, VTEC doesn't engage at all regardless if it's WOT or partial throttle. I thought WOT was maxed out at 80% anyway?TPS reading ~20% and no VTEC sounds normal to me, you haven't met the MAP requirement yet. Also, your WOT graph shows TPS only at 80%?
Thanks for the input. If what you are saying is true, I am not sure how to move forward here. VTP is active even at idle but switches to off the moment VTS is engaged. From your info and pairing that up from what I see in my datalogs, this indicates that the moment VTS engages, I lose appropriate pressure, which is why VTP disengages and I hear no VTEC when VTS engages. I'm also on cable throttle. I'm wondering if there is some calibration that needs to be done for that. My TPS itself is at the right calibration voltage on the throttle body itself. I used a multimeter for this and got it dialed in. Not sure if KTuner requires some additional calibration.at least for drive by cable throttle cars, TPS % needs to go to 100%.
for the K20a2, VTP needs to be on (triggered by sufficient oil pressure) for the cam switch to happen. If VTP drops the moment VTEC engages, it will disengage again instantly as indicated by the VTS status. VTP is positive at higher rpm at all times as this just indicates sufficient oil pressure for the VTEC mechanism to work.
In KPro you can disable the VTP switch and it will ignore the VTP signal and engage VTEC at any oil pressure.
From what you have shown in the logs it looks like air is missing, which could be an indication of a not engaging VTEC pin and not proper priming VTEC spooling valve.Tuner also says he's not seeing evidence of VTEC engagement
Here it is set to 0 mph. From what I've seen in the #1 post all requirements are met for an engaging VTEC: temperature limit, engine speed limit and MAP limit. But I assume this are not all to be checked for this manner: VSS, VTS, VTP, oil pressure, and so on.you need a minimum speed for VTEC to engage
Here are the readings after testing:From what you have shown in the logs it looks like air is missing, which could be an indication of a not engaging VTEC pin and not proper priming VTEC spooling valve.
What makes me confuse is why TPS is limited to 80 % opening. Did you calibrate it like this: WOT = 80 % TB opening?
Here it is set to 0 mph. From what I've seen in the #1 post all requirements are met for an engaging VTEC: temperature limit, engine speed limit and MAP limit. But I assume this are not all to be checked for this manner: VSS, VTS, VTP, oil pressure, and so on.
@Teedohs What I am wondering about is why does the VTEC engaging line has no lower pressure limit after the upper engine speed limit is met. Once you are on WOT and go through the gears, every shift you need to lift the pedal and disengage VTEC for a short time (using a normal shift procedure), just causing wear on the pins an the mechanism. Is this setup done intentionally?
Please add always MAP, TPS, engine speed, INJ and Lambda in first prior, these are the vital parameters. In a second order duty cycle of injectors, VSS, VTS and IGN as well as CAM and CAMCMD (commanded and actual VTC). Without MAP you know less about the engine, as you can't see if breathing capacity follows the TB.
Where do you see this or where can I set this? I'm not sure where this is set and what a good starting limit isWhat I am wondering about is why does the VTEC engaging line has no lower pressure limit after the upper engine speed limit is met.
Whatever the current setting is, that was done by the tuner. Unfortunately, I'm completely blind to a lot of the tables because my tuner has them locked and I can't read most of the tables only some feature settings.Once you are on WOT and go through the gears, every shift you need to lift the pedal and disengage VTEC for a short time (using a normal shift procedure), just causing wear on the pins an the mechanism. Is this setup done intentionally?
Thanks for the info. I'll share this with my tuner. I hadn't thought about lowering VTEC either. This is indeed stock cams, intake, etc. Everything is stock inside and out including the exhaust and manifold.On the ktuner it's normal behavior for the VTP light to go off when the VTS/vtec gets activated. I also think that your
vtec is engaging. You running the stock intake,cams ect ?
Tune WOT finish set the higher cam angle to 0 degrees and see if the AFR's has changed also check your cam angles that its then using.You could also try and set vtec lower at 4000 to see if theres a change in the AFR graph before the initial 4800 engagement.
With vtec set so high on stock cams which iam assuming it is you might not be able to hear it engage. With the stock oem cams i usually engage vtec at about 3600 to 4000 rpm depending on the setup.
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I also think it's kinda impossible to get the fueling right on the car using etuning if the car was not going into vtec.
The tuner will be adjusting the high cam fuel tables from the logs you sent surely he would have picked up if something is wrong. Maybe i am wrong but from what you posted that is my take on it.