A little SCAN GAUGE II help...

[gsfent]

Recently added SCII. With the help of info here, I have programmed the lean burn gauge. Thanks!

I want to make sure the gauge is properly set. My TPS at idle reads "9". I would have guessed "0", but everything seems OK. Is "9" or so the proper number?

Fuel cutout is supposed to be 4 above the idle TPS number. It defaults to 24. If 9 is correct, then I need to set the fuel cutout at 13?

Lean burn works as 0, also seems to work around a reading of 20 or below based on the dash display. It is a little hard to confirm because there is a 2-4 second delay between engine and SC II readout. I have tried slow, fast and normal, and slow actually seems to work best (I would have thought fast).

Engine load always seems pretty high, even at light throttle openings. I see 80's and occassionally 90's. Downhill or lean burn cuts the number way down, so it seems to be operating correctly. Is the load on the engine always so high because of the relative lack of torque?

Finally, it seems I can get lean burn up to just under 70 mph. From other reading here, it seems lean burn should work up to about 72 mph. Is this correct?

I am working on moving the SCII to a Blendmount under the mirror, just need to scounge up some additional bushing material to take up the slack. Project for the weekend.

Regards,
Jerry

[elperepat]

All you say here is in line with what I get on mine. I personally set Fuel cutoff at 10, but as I don't really use the SGII for fuel consumption (I prefer the FCD on the dash), so I can't confirm the precision of this. However, the cutoff seem to happen only when I get my foot completely off the pedal, so a 9-10 TPS value.

Lean burn is only when value is 0. All other values are not a lean burn condition. I get 100+ values when the engine is cold. After warmup, I get values in the 80-90. 0 is lean burn. All other conditions seem to be transcients when going into or out of lean burn (because of the slow refresh rate).

Rate: Slow is what I use. Fast seem to miss some values from time to time.

Load is indeed high, but that's in this condition an engine is the most effective. So I guess it's by design. I don't see a change in load when going into lean burn. Can anyone else confirm that lean burn affect their load value?

[Insightful Trekker]

Originally Posted by gsfent

Finally, it seems I can get lean burn up to just under 70 mph. From other reading here, it seems lean burn should work up to about 72 mph. Is this correct?

Can't help with the other parts of your question, but yes, 72MPH is the _absolute_ maximum limit for lean burn in the Insight. Variation of engine load can reduce the maximum achievable MPH as well as _any_ modifications to the driveline that effects the MPH / RPM relationship as designed (i.e. tires).

HTH!

[RobertSmalls]

I have achieved lean burn at 72mph, but only under optimal conditions: RE92's @ 47psi, IMA off, the atmosphere not too dense, intake temperatures hot, and everything running smoothly. If your car only does it up to 69mph, you're probably using a little more energy per mile than some of us.

The ScanGauge doesn't directly measure fuel consumption. Because the onboard computer is good enough at that, I ignore the fuel consumption report from the SG (and therefore its TPS-based DFCO guesstimate).

The lean burn gauge actually reads one of the O2 sensors. When the sensor is cold, it reads 127. When the sensor reads rich, it says 80-95. When you're running sort of lean, it's between 5-35, and when you're in lean burn mode, it reads 0.

Congrats on your purchase.

[MN Driver]

Thanks for the information about 72mph being the max. I assume that is point in top gear where the vtec solenoid locks, right? I've always wondered what MPH that this happens at, I just knew the 2500rpm(or was it 2400) was when VTEC kicks in.

I've been able to hold 65mph at about 75mpg with the occasion of pulling the 65mpg when encountering slight inclines. Does your lean burn pop out with the FCD at 65mpg right about the point where you are feeding gas and it would normally drop to 60mpg? I need to get a Scan Gauge to help with getting the right throttle position to engage lean burn, driving down the highway trying to hold the car at 100mpg waiting the 3-5 seconds for lean burn to kick in and slowly feeding throttle back in loses a good 5-10mph sometimes. I figure it's much better with the SG, right?

[elperepat]

Even though I have a SGII, I use the FCD to engage lean burn. The refresh rate of the OBD II is not really fast and the FCD is much more responsive. I use the SGII to confirm that I'm in lean burn in low-loads condition when it's not that clear on the FCD. To go into lean burn, I release lightly the gas pedal to about 90mpg, wait for the mpg reading to abruptly raise, then press slowly the gas pedal until I'm back at 75mpg. Then I look at the scangauge to see my TPS. If it's 30-31, I release pressure a bit to make sure a bump in the road (and on the gas pedal) doesn't get me out of leanburn.

Depending of speed (I drive slowly: 55-60mph) lean burn disengages when going from 70 to 65 mpg. The conditions with the SGII are a TPS greater than 32 or load greater thand 92%. There's also a low speed limit and by memory, it's around 30mph in 5th gear.

[MN Driver]

Yes, it seems to be around 30mph but it makes sense considering that is the point where you are at about 1000rpm and really can't develop anything for power in a 3 cylinder anyway. If I know I'm going to be around 35mph I'm usually in 4th gear if there won't be any traffic or inclines as it seems gas mileage is better than 5th where if speed drops off a little and I want to catch up, it will sit at 65mpg for a long time and I'll get no added speed but in 4th gear I get more speed from 75mpg depending on the conditions. If I'm around 30 I'll be in 3rd gear. I don't drive enough at 30 or less to know too well but it seems this car likes being close to 2000rpm or a little lower when cruising for the most ease of driving and economy mix. On the highway if I'm above 60 I can get to 65 quicker in lean burn in many cases than going from 45 to 50.

[gsfent]

Thanks for all the good info.

It seems like the SC II is working fine. I agree the refresh rate is slow, and the FCD is much more helpful in determining lean burn. I can maintain with TPS in the low 20's it seems. I will have to double check the SC II mpg meter to see if it registers lean burn economy after the 2-4 second delay in refreshing.

I also get better indicated economy using a lower gear at low speeds. 1000 rpm is lugging the car. My car isn't too happy below 1500, but seems very happy at 2000 or a little above.

Although I cleaned my plugs a couple of months ago (65k miles), I have fresh set ready to go in, see if that helps the low speed lugging any.

Regards,
Jerry

[faxe]

Originally Posted by gsfent

I am working on moving the SCII to a Blendmount under the mirror, just need to scounge up some additional bushing material to take up the slack. Project for the weekend.

Regards,
Jerry

Did you succeed with the Blendmount. ?

Any photos of the installation.?

I am also working on a proper way to mount my SG. and the Blendmount
looks good, but i would like to have the SG. above the mirror...

[nickatnite]

Check out Leo's mounting idea for a ScanGauge. I did the same on mine and love it. Very easy to see and you can pull it our easily if you want to use it on another car to read codes.

Scangauge - Cool way to mount in the Insight