Safe lean cruise.

[Beastlee]

I run mine, with my mods, at 15.2 closed loop. This has had no detrimental effects on the knock or EGTs as far as I can see, even during slow traffic, it passes MoTs wihtout the thrashing previously needed too. I just did 265 miles to 45L of fuel with mostly 80mph motorway driving so mid 20s mpg, no lack of power either as the BMW 5 found out during my one moment of weakness.

[foxdie]

I just did 265 miles to 45L of fuel with mostly 80mph motorway driving so mid 20s mpg

Okay.. I'm running 15.2 AFR and exactly the same as you I've just got over 300 miles to 45~ litres (around 30 MPG)

[Beastlee]

Jase it all depends on the driving style, road types and overall combined consumption though. The last 65 miles of mine was stop/start and round camp so will have dropped the overall economy drastically at that point.

[lateshow]

I'm doing about 9.2 litres/100km on 80-100km/h, nice. Beastlee. have you monitored you EGT?

[Shtiv]

I ran open loop everywhere for a while and was runninng about 15.5 at really low loads (20%ish), 15.2 at around 40% load and 14.7 by 80%, it ran O and I got some fuel benefit, about 5%....

[Beastlee]

Lauri, I unfortuanately don't have the facility to monitor them.

[lateshow]

Lauri, I unfortuanately don't have the facility to monitor them.

so we cant say for sure what the EGT does, because I think my engine runs a little bit hotter now than it used to...

[Nick Mann]

Why do you think the engine is hotter?

Coolant temp is measured by the ecu, quite accurately. Are you seeing a significant change there? It would be difficult to quantify, due to the thermostat still opening and closing at the same temp and the weather having an effect on the cooling of the car too.

[Beastlee]

I noticed yesterday that evoscan can log egt, there was a definite reading but i didn't think a VR-4 had a sensor.

[Nick Mann]

You are right, Lee, the VR4 doesn't have an EGT sensor!

[Beastlee]

Hmm, wonder what it's reading? It's not a constant anyway.

[MackTheKnife]

Been running 15.2 for a few days now, mostly 75 mph (120 kph). Car has been fine even on the steepest of hills. Looking forward to seeing how fuel economy improves next fill. No knock to report, car has been running sweetly.

[lateshow]

Torque convertor seems to do it's lockup faster than it used to, however i've changed the engine mounts at the same time which can have an effect too.

[lateshow]

Been running 15.2 for a few days now, mostly 75 mph (120 kph). Car has been fine even on the steepest of hills. Looking forward to seeing how fuel economy improves next fill. No knock to report, car has been running sweetly.

If you guys are running in closed loop, what kind of formula are you using for narrowband output???

[paulg23]

If you guys are running in closed loop, what kind of formula are you using for narrowband output???

I just set the NB output to 1 volt if the AFR is less than 14.7:1 and set it to 0 volts if the AFR is 14.7:1 or greater. I can move the AFR point from a dashboard control.

[MackTheKnife]

If you guys are running in closed loop, what kind of formula are you using for narrowband output???

I have a Zeitronix ZT-3 wideband hooked up.

I attached the stock O2 to the outside of the exhaust and put the wideband in it's place. The heater wires for the old O2 sensor need to be hooked up, otherwise you may get a check engine light.

I checked the wires on the old O2 plug for continuity to see which two were for the stock O2 sensor heater and then checked the other two wires where the O2 plugs into to see which was earth.

I ended up cutting both the sensor feedback and earth wires on the stock O2 sensor about an inch and a half from the plug. Then I attached the purple cable narrowband O2 emulation wire from the Zeitronix unit to the blue cable of the old O2 sensor (which was the sensor feedback wire on mine). The Zeitronix Unit also needs to be hooked up to switched power & earthed (I picked the ciggie lighter power wire because it's handy to where I mounted the Zeitronix unit).

Then all you need is a USB to Serial cable (which I got with my EvoScan GPS thing) and a Laptop. On the Zeitronix software, there's a menu item to change the Narrowband switching point, change it and you're done.

I believe the bloke who designed the Zeitronix Unit has a Galant VR4, not sure if his is an 8G one though.

[paulg23]

I removed my narrowband completely and don't get an engine check light.

[foxdie]

I removed my narrowband completely and don't get an engine check light.

Not even after 20-30 mins of driving? The ECU won't require a signal for a couple of minutes on startup because it knows the sensor has to heat up first.

[Nick Mann]

I don't think that has much to do with it, Jason? The check engine light would be appearing because the ecu thinks the heater for the sensor is open circuit. The stock sensor won't read accurately if it is not hot enough, if I understand it correctly.

Anyway, if the ecu is getting the narrowband signal where it expects, the only reason for a CEL is because the heater is open circuit.

[foxdie]

My heater circuit is currently open (oh my!), no fault code on my end, but I am inputting a simulated narrowband input from the LC-1 / MTX-L controller.