Anybody have BSFC d16y7? (96-00 civic dx lx)

[California98Civic]

So basically, if serialk11r is right, the answer to the OP's question is ... "no" (nobody here has a d16y7 BSFC map, still). lol

[hayden55]

Tried it today since it's my first day to use the scan gauge. Going to hot springs I used the 75-80% load shifting at 2250, engine off down hills. 45mpg vs the 38mpg i typically get. Not too bad. Seems to work. 10 miles at 70mph, then ~50 at 55mph, ~10 at 25-35mph.

[serialk11r]

Originally Posted by California98Civic

So basically, if serialk11r is right, the answer to the OP's question is ... "no" (nobody here has a d16y7 BSFC map, still). lol

The real answer is it doesn't matter, because gasoline piston engines are remarkably similar.

One look at the specs of the engine (no VTEC, bore, stroke, rev limit fall within typical range) tells you 240-250g/kWh is probably as good as it gets, and generally there's an island of peak efficiency somewhere in the 2000-3000rpm range at 80+ Nm/L load.

The peak efficiency doesn't even really matter, because it only varies 5-10% within a several thousand rpm range above 1500rpm most of the time. When you drive a car, the engine speed is going to be changing all the time, so you can never be that precise.

[California98Civic]

Originally Posted by hayden55

Tried it today since it's my first day to use the scan gauge. Going to hot springs I used the 75-80% load shifting at 2250, engine off down hills. 45mpg vs the 38mpg i typically get. Not too bad. Seems to work. 10 miles at 70mph, then ~50 at 55mph, ~10 at 25-35mph.

Keep a fuel log here at the site, so you can chart your numbers. Using this technique your averages will start to climb right away. Is you scan gauge calibrated?

[hayden55]

Originally Posted by California98Civic

Keep a fuel log here at the site, so you can chart your numbers. Using this technique your averages will start to climb right away. Is you scan gauge calibrated?

I don't have a GPS but I used a Tremec gear calc and heres what's odd:
Speedo and RPM read ~74-75mph and ~3150ish rpm which is clearly wrong as im traveling 70mph.
From tremec's website the car should spin 2960rpm at 70 and sure enough with no offset, the scan gauge read 70mph @ 2960rpm. So goofy gauges, but the obd2 signal to the scan gauge is 100% correct.

[California98Civic]

Originally Posted by hayden55

I don't have a GPS but I used a Tremec gear calc and heres what's odd:
Speedo and RPM read ~74-75mph and ~3150ish rpm which is clearly wrong as im traveling 70mph.
From tremec's website the car should spin 2960rpm at 70 and sure enough with no offset, the scan gauge read 70mph @ 2960rpm. So goofy gauges, but the obd2 signal to the scan gauge is 100% correct.

You are saying that Tremec told you 75 mph and the OEM speedometer read 70mph and the scan gauge read 70 mph? If so, you have your Scangauge speed reading calibrated, but the car might be giving your gauges incorrect information because of tire/wheel size. What size wheels/tires are you running?

[hayden55]

[QUOTE=California98Civic;515741]
The reverse. Speedo read 74.5 ish and rs read like 3150.
But scangauge zero offswt read 70 at ~2960, and calculated speed was 70 at 2960 even.
The gauges read incorrect, but the scan gauge is spot on with the distance it should be covering.

[mwilliamshs]

I just got a 98 Civic LX and my speedo is about 6-7 mph high. 77 mph on GPS was just a bit under 85 on gauge.

It's an automatic.

[Ecky]

In my 94 Del Sol, I had to take the cluster apart, pull the speedo needle off, and put it back on adjusted slightly. If the speedometer had been reading off by a percentage, that would have suggested the wrong tire size, but it was about 6mph high at 20mph, and 6mph high at 80mph, which suggests to me that the spring inside of it was just getting tired. After pulling the needle off and adjusting it, the speedometer, GPS, and odometer all agreed.

[hayden55]

Here what I mean. The needles are just literally off.
Pic:
https://drive.google.com/file/d/0B1A...w?usp=drivesdk