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Old 22nd May 2010, 07:24 PM   #1 (permalink)
R32 Combat is in limbo
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MPG

For the record.

I got 570kms out of 58 litres, which is about 27mpg.

This was V-Power fuel.

Thats driving at 80mph with the AC on.
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Old 22nd May 2010, 09:09 PM   #2 (permalink)
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you are the man!!!! I never got more then 22 mpg
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Old 22nd May 2010, 10:54 PM   #3 (permalink)
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never had better than 17mpg....????
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Old 22nd May 2010, 11:40 PM   #4 (permalink)
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never had better than 17mpg....????
I should check your O2 sensor I can get that from mine
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Old 23rd May 2010, 08:39 AM   #5 (permalink)
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never had better than 17mpg....????
Your lucky l get 12 to 15 mpg but lm fully loaded most of the time.
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Old 23rd May 2010, 08:42 AM   #6 (permalink)
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put in new 02 sensor a while back, just the state of tune i think, car was covered in loads of s.w.a.t. stickers when imported, ran a 14.3 at thorny island, thats good for a skyline r33 gts25t, car is defo not stock!!
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Old 23rd May 2010, 06:14 PM   #7 (permalink)
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put in new 02 sensor a while back, just the state of tune i think, car was covered in loads of s.w.a.t. stickers when imported, ran a 14.3 at thorny island, thats good for a skyline r33 gts25t, car is defo not stock!!
Then I would say your tune is off...becouse both Brain and mine are not stock...
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Old 23rd May 2010, 06:15 PM   #8 (permalink)
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Your lucky l get 12 to 15 mpg but lm fully loaded most of the time.
how much wieght is that...James
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Old 23rd May 2010, 06:18 PM   #9 (permalink)
R32 Combat is in limbo
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Where as mine is standard bar air filter.
The higher octane fuel helps too.

I run about ˝ bar vacuum at 80mph, which is nice.
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Old 23rd May 2010, 09:01 PM   #10 (permalink)
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27mpg at 80mph with the A/C on!!
Tell me what your secret is.
I should be so lucky!
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Old 23rd May 2010, 11:37 PM   #11 (permalink)
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Well r32combat does have a manual series 2 with a neo engine,

Being a manual gearbox helps a lot which is why nearly all series one Stageas seem to drink the petrol
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Old 24th May 2010, 08:15 AM   #12 (permalink)
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how much wieght is that...James
Not sure on the total weight l carry an electric wheel chair 178LBS two 6ft metal ramps three dogs my partner and on occasions the parrot with cage, so its heavy, perhaps l shouldnt moan about the MPG l get
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Old 25th May 2010, 04:37 PM   #13 (permalink)
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put in new 02 sensor a while back, just the state of tune i think, car was covered in loads of s.w.a.t. stickers when imported, ran a 14.3 at thorny island, thats good for a skyline r33 gts25t, car is defo not stock!!
Stagea Web Advanced Tune by any chance????
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Old 28th May 2010, 10:19 AM   #14 (permalink)
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For the record.

I got 570kms out of 58 litres, which is about 27mpg.

This was V-Power fuel.

Thats driving at 80mph with the AC on.
I managed something like 27mpg out of my Series 2 tiptronic when I first picked it up. It was standard tune back then and I was doing 65-70 on the long drive home because I didn't know the car yet.

I recently made an attempt to calculate the mpg from the injector duty cycle and speed. Here are the results.

At 50mph 3.6ms = 5.85% duty cycle
22.23cc/min,133.38cc/min total=8002.8cc/hr
1.76 gallon/hr at 50mph=28.4 mpg

At 30mph 3.3ms = 4.26% duty cycle
16.18 cc/min,97cc/min total=5824.8cc/hr
1.28 gallon/hr at 30mph=23.4 mpg

At 60mph 4.3ms = 7.88% duty cycle
29.94cc/min,179.6cc/min total=10778cc/hr
2.37 gallon/hr at 60mph=25.3mpg

From standing start to 70mph foot down hard 16ms = 85.3 % duty cycle
324cc/min,1944cc/min total=116640cc/hr
25691 gallon/hr at 70mph=0.0027mpg !!!!

These were taken with 2 on board and half a tank of juice on a reasonable day, neither particularly hot nor cold weather. At the time the car was running induction kit, cat back, silenced de-cat and using Tesco 99.

I often use tiptronic mode around town because I think that the auto probably changes up too quickly and hangs onto the higher gears too long. Certainly by using lower gears I see a lower injector duty cycle on my informeter and also on the over-run the fuel is cut down much more in a lower gear than if I let the box decide to keep it in a higher gear.

None of this is by any means proven since I haven't taken guaranteed fuel useage measurements by using the fill up and zero trip meter method. I only made those calculations on a whim after being bored one day.
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Old 28th May 2010, 09:10 PM   #15 (permalink)
R32 Combat is in limbo
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Can you go through your calculations?
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Old 28th May 2010, 09:24 PM   #16 (permalink)
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This is what I worked out.

Example. Injector is 380cc/min

So at 9% duty cycle that's 9% of 380 = 34.2 cc/min
Multiply by number of injectors, 6x34.2=205.2cc/min
Multiply by 60 to get hourly consumption 205.2x60=12312cc/hr
Convert to litres ,divide by 1000, 12312/1000=12.312
Convert to gallons, divide by 4.54, 12.312/4.54=2.71 gallons per hour.
Divide 60mph by gallons per hour to obtain mpg. 60/2.71=22.14mpg

If you want a quick way to calculate IDC from IPW at any given RPM, look here Stealth 316 - Injector Duty Cycle Calculation

Alternatively rpm x IPW / 1200 = IDC %

I did post these details on another forum and asked if anyone could confirm the validity of my calculations, but no-one did.
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Old 28th May 2010, 09:45 PM   #17 (permalink)
R32 Combat is in limbo
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Looks spot on.

There is a variable, the fuel pressure. It could swing 20psi. Thus varying the fuel volume a 20% or so.
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Old 29th May 2010, 11:55 AM   #18 (permalink)
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Looks spot on.

There is a variable, the fuel pressure. It could swing 20psi. Thus varying the fuel volume a 20% or so.
Hmm, yes. I had considered that, but without a fuel pressure reading there's not much I can do about factoring it in.
In an ideal world I would have fuel pressure and fuel flow readings, but this was just something I was thinking about when I was bored one day.
The inspiration for it was from thinking about some of my old cars that had "mpg" displays in them and how they had calculated it. Certainly, it's clear that there are too many variables for a truely accurate calculation. I did even consider going about making a box of tricks to display the values, but that's a little beyond my capabilities and probably taking things too far really.

Thanks for confirming my thoughts though. When you look at the figures, they're not too bad for a big old Datsun estate !
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