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Old 05-11-2011, 09:38 AM   #11 (permalink)
1999 Honda Civic HX 5MT
 
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*BUMP*

Good Morning Everyone! =D

I bought ScanGauge II -- too many variations when not realizing that VTEC-E went into second stage.

I *REALLY* need to tap my MPGuino into VTEC-E...

Anyway - I am thinking about adding VTEC-E indicator. Do anyone have a layout of ECU for 1999 Honda Civic HX VTEC-E engine? That way I can add 2 LED's indicating that VTEC went into next stage.

So far my last actual TANK mpg was 69.412 mpg @ 542.8 miles, 7.82 gallons (204.15% of combined EPA of 34).

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Old 05-11-2011, 06:27 PM   #12 (permalink)
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As I said the civic's in europe came equipped with the "eco-light".
I do have a electric diagram, with the wire-colors etc.
I will scan it for you friday.
I suspect that the wire's are already present, wire looms are often the same, nomather if its a base modell or a luxery modell.

The econ light really helps, you really got to keep low throttle to stay in lean-burn.
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Old 05-12-2011, 07:29 AM   #13 (permalink)
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I'm definitely interested in the wiring for the "eco light" for Gen 6 HX.

I've seen notes for building such a light for the older VX, which also had lean burn. But I haven't tried to understand them or figure out if that design can be used on the Gen. 6 HX.
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Old 05-13-2011, 06:06 PM   #14 (permalink)
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As promised:
The electrical diagram, the partlist is in dutch so I didn't bother to scan that page.
In the 1st image I colored the econ light green.
In the second image I highlighted the wire connection on the ecu in green.
The wire-color you must search for is white/red.
If you can't find it I'm willing to make a (in car) picture of the ecu connection location.

(Beware the US electrical diagram may differ from the europe ones.)

If you zoom in you'll see a little referance "star" (*) left above the symbol, the translation;
* niet op alle modellen aanwezig = *not present on all modells


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Old 05-14-2011, 10:27 PM   #15 (permalink)
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A vacuum gauge & the dead peddle zone in lean burn is where I found the trick to better mpg.I can maintain 60mph in lean burn with vacuum at 8", let off gas to about 15" & still maintain speed.completely different from conventional peddle habbits on non lean burn engines.and hard to do if im not thinking about it.
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Old 05-15-2011, 03:22 AM   #16 (permalink)
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So what can I do in my situation?
I plan on putting a 92-95 VX motor in my 91 crx dx.. Can I do a light such as this?..
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Old 05-16-2011, 06:09 PM   #17 (permalink)
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I found the layout of the ecu, as you can see in the picture below there 4 connectors, you'll need the one with 32 connections.
The one were the measering pins are connected in the picture.
The white/red wire connects to no.30 (econo), and has or 0 volts or 12volt.






There are also other ways to connect a lean-burn indicator light, in the HX and for sure the d15z6 the engine usses a narrow-band lambda, if its in lean-burn it signal dissepears becouse its out of its measering range.
It's calculating its AFR with a rpm-fluctiation sensor.

The older d15z1 vx had a wideband-lambda, but when it brakes down it's very expensive to replace so the honda engineers thought away around it with the RPM-fluctuation sensor!

Last edited by beer; 05-16-2011 at 06:24 PM..
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Old 05-16-2011, 06:29 PM   #18 (permalink)
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Quote:
Originally Posted by robertsvx View Post
A vacuum gauge & the dead peddle zone in lean burn is where I found the trick to better mpg.I can maintain 60mph in lean burn with vacuum at 8", let off gas to about 15" & still maintain speed.completely different from conventional peddle habbits on non lean burn engines.and hard to do if im not thinking about it.
Yeah it will work, but accuretcy is not as good as directly tapping a signal from the ecu.

Quote:
Originally Posted by wyatta4 View Post
So what can I do in my situation?
I plan on putting a 92-95 VX motor in my 91 crx dx.. Can I do a light such as this?..
As i recall there was a topic about a lean-burn indicator in a OBD1 D15z1 engine.

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