DanB93

My turbo Civic is using Apexi as management. It throws the engine light on in 3rd or higher on full boost above roughly 6500 rpm. The light comes on and stays on until I come off the throttle or change gear and drop the revs however Apexi says if the light is a warning it should flash not stay on, is this correct?

Now, I've read that this can be for a few reasons;
1. Knock - It doesn't seem to have a sensor fitted (below the inlet manifold by cylinder 3?) so can't be that?
2. Air flow limit - It has both a standard 1.7-bar and 3-bar sensor fitted.
3. Injector limit - Unlikely since it does it even on low boost and it has 750?cc's.

Anyway here's my question...
It has 2 map sensors fitted, standard 1.7-bar and 3-bar. Is that light being thrown on because the limit of the standard one is being reached/passed? (10.7psi). This would make sense because it's around this boost pressure that the light seems to come on. Or is it for another reason? I'm want to make sure it's safe.

The car is a top fuel turbo b18 running 540 hp at 1.4 bar through an Apexi RX6? turbo.

I've tried reading ECU codes and there's none stored.

Any help is appreciated.

DanB93

Anyone know anything about this?

TheShodan

iTrader: (14)

You're fine. Its not the injector limit. IF you're running over 12psi, its just the light indicating that you're going past the standard MAP sensor's limit of 11psi. (10.7) I have that myself. Its not knock, (you have a knock reader in your commander to show that). It's not an "air flow limit".. you're not a MAF car, so that's not it. Injector limit is based upon your duty cycle. Again, you can also see that in your commander.

I have both the OEM sensor and Denso 3 bar map from the boost kit hooked up. you're good.

Remember, the ECU is based upon the OEM parameters. When you bypass that by setting your boost threshold past what the original parameter is, it just will light up to show that. I've had mine since 2004, still drive it today. nothing to sweat.

DanB93

Cool thanks, as I thought. I just assumed it would've been possible to get rid of it and why whoever built it didn't because it's annoying and worrying to people who aren't sure about it.

TheShodan

iTrader: (14)

The APex'i standalone wasn't originally intended on being used for turbocharger projects that have MAP readings above stock. That's why it was an afterthought. The newer version with its faster processor doesn't have that, from what I remember. I have the newer model going on my car in a month, and will update you on how its configured if interested.

I guess I don't really find it annoying, because the CEL light works for everything else, from an overheating condition to knock warning, etc.

DanB93

Thanks.
Yeah update me when you get it.
So there's no known way of getting rid of a CEL light for individual faults like this with Apexi? I think I've read that you can with Hondata, true?

VegasInvasion

Don't think the PFC lets you do that, however I just tuned an RX7 on a PFC and it had the option to rescale for an aftermarket map sensor, so you should have that capability as well. Not sure why you would ever use a PFC on a chippable Honda though.

TheShodan

iTrader: (14)

I did it because I didn't want to deal with "chips" at all. In addition, at the time, only S200 was available, and was a nightmare to work with on injectors over 750cc for the type of partial throttle I wanted.

I still wouldn't get rid of mine, honestly, as I only need 2 gauges for all of my readouts with the commander pro. Sure, not everyone can tune with it, but that's the point, only the good tuners are selected to work with it with APex'i's blessing to give them the software.

I'm just from an era that just isn't much for Hondata and their type of management, I guess. I really want nothing to do with them, from their management to the MAP sensors. I'm not a fan of their service, equipment, nor would I have to worry about knock-off components like Hondata deals with. If that means that I spend more money on something more robust for my particular Honda needs, then so be it..

Sorry about the soap box sermon, simply my opinion, and that's all..

VegasInvasion

In my humble opinion, Hondata is overrated. Their UI is still just as unorganized as RE3 was.
But technically speaking the PFC's capabilities are pretty limited, more suited for learning than for high end applications. It's tolerable to tune with the Datalogit, and it does have its effective boundaries, but if you can program an aftermarket MAP sensor it'll do the job just fine.
The real test of an experienced tuner is the AEM or Haltech EMS. Nothing is more thorough or complicated than that.
However, there is no application that Neptune can't conquer - it even works on Toyotas. We don't really use chips these days, just emulators.
Happy tuning

TheShodan

iTrader: (14)

You're a bit behind on datalogit. They've upgraded that system since 2005. "Limited" is a subjective term, because many of us that use the system never worried about drag racing or the features that the other popular systems concentrated on. You could make them work in the pfc as well, just want a propriety..
from when I did mine, we didn't have to calibrate anything for neither the OEM sensor nor the denso map sensor. The newer processor and software interface is leaps above the older datalogit from 2004..

I found the pfc easy to work with when you used the commander pro software, and at 530whp max currently for myself, the newer hardware and software interface can only get better...
The ONLY other system I'd consider is Haltech..

But no.. I'll never get hondata either..ever