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Re: TDI mpg vs engine temp

Posted: 26 Sep 2012, 16:24
by lloydy
from what i have worked out, the 80 degree stat was a VW option for cars with air-con

Re: TDI mpg vs engine temp

Posted: 26 Sep 2012, 21:05
by lhd
Gauge Sits on the LED Clive, doesn't really rise at all unless off road at 3 mph with a few vans in front.
Havn't got any added gauges at the moment though.
Have an oil cooler and as Lloyd says, 80 thermostat is for cars running AC.

Re: TDI mpg vs engine temp

Posted: 28 Sep 2012, 13:36
by HarryMann
leave it alone then?

Re: TDI mpg vs engine temp

Posted: 30 Sep 2012, 10:41
by randolph57
I am using the standard A4/Passat sender but my gauge reads well above the LED so perhaps its time to fit a series resistor or alternatively a different gauge.
Having the Ultragauge means loads of extra info to view and i have coolant temp on all of the gauge pages i have set up so have learnt to 'ignore' the visual reading of needle anyway.
Must say i am more than happy with the ultragauge and well worth the£75 (including import tax/delivery) if data floats your boat. :D


ultra.jpg

Re: TDI mpg vs engine temp

Posted: 30 Sep 2012, 10:53
by lloydy
I fitted the T3 sender for gauge (earlier in this thread I think?) as I didn't like the gauge reading so high. Took 1/2 hour tops. B'werks sell all the bits to do it

Re: TDI mpg vs engine temp

Posted: 30 Sep 2012, 12:37
by keith
randolph57 wrote:I am using the standard A4/Passat sender but my gauge reads well above the LED so perhaps its time to fit a series resistor or alternatively a different gauge.
Having the Ultragauge means loads of extra info to view and i have coolant temp on all of the gauge pages i have set up so have learnt to 'ignore' the visual reading of needle anyway.
Must say i am more than happy with the ultragauge and well worth the£75 (including import tax/delivery) if data floats your boat. :D


ultra.jpg


Hi....where did you buy it from....cheers

Re: TDI mpg vs engine temp

Posted: 30 Sep 2012, 18:24
by randolph57
Hi
Try this link http://www.ultra-gauge.com/ultragauge/index.htm" onclick="window.open(this.href);return false; one bit of advice though is to read their tips to (hopefully) avoid the import duty(which i neglected to do :oops: ) .Gauge can display 41 of 76 possible gauges available in my case-just depends which variant of ECU you are using.
i believe although it can read and display/reset fault codes like the scan gauge it cant do so on the 9141 'circuitry' applicable to early passat/AFN cases (unless you know different). :D

Re: TDI mpg vs engine temp

Posted: 30 Sep 2012, 21:04
by keith
nice one thanks...

Re: TDI mpg vs engine temp

Posted: 01 Oct 2012, 12:57
by Cableguy
Done 561 miles from mine to snowdonia then to Brickwerks.
Mixture of mid Wales wilderness driving to 80 on the m-ways.
Comes out at 38 mpg. got to be pleased with that. Haven't changed my stat yet, wonder if I'll see 40??

Re: TDI mpg vs engine temp

Posted: 08 Oct 2012, 06:54
by lloydy
327470-327926 =456km @ 57.38l = 23mpg? This was mainly run on the drive, fixing stuff or very short drives
327926-328232 = 306km @ 29l = 30mpg? Motorway driving and with the eber running for about 8-9 hours in total in in the evening and morning.
I seem to now get varying results when I fill up to first click, always used to go way over the max mark. Now seems to vary between max line or slightly under.
That last fill (30mpg) is same as normal, but not inc the eber running. (mostly seem to get 300km out of half a tank)
Also I have just replaced the cheap copy MAF with a genuine VW one, makes a MASSIVE difference. Gone from feeling a bit laggy low down to pulling amazingly strong throughout the rev range. So much so that I think I could get the fuelling turned down a bit. Shocked by the difference a MAF can make!

Feel a bit jealous of you longer geared people as 62mph is 3200rpm for me, I'm sure the same speed at 2800rpm would save a bit of fuel too. Now what's the biggest tyres you can fit on 16"-7" alloys on a 16" syncro?.....

Re: TDI mpg vs engine temp

Posted: 08 Oct 2012, 12:05
by HarryMann
I seem to now get varying results when I fill up to first click, always used to go way over the max mark. Now seems to vary between max line or slightly under.

Exactly... this is why I keep banging on to all of you tdi mpg 'ers.. none of these figures are really trustworthy until you start plotting long term consumption over many fillups, using continuous raw data. But I'm about out of breath on this one...

and not forgetting accurately calibrating the odo as well.

They're useful as comparisons for yourselves but not between yourselves on an absolute scale :wink:

Re: TDI mpg vs engine temp

Posted: 08 Oct 2012, 14:38
by Mudlark
I have raised the question before and not got a sensible reply so can i try again?

Would the 'first click' be more relevant to the pressure at which the fuel is being delivered from the pump rather than the fuel level in the tank?

Realise that if you use the same pump week in and week out it may not vary much but i am sure there is a marked difference between delivery pressures from pump to pump.

I only go on brim to brim, literally fuel an inch below the brim of the spout and it is real pita taking upwards of ten to fifteen minutes of dribbling fuel in to get there. Start all trips at that level and for the purposes of calculating mpg finish at that level; take litres used kilometres/miles travelled, % adjustment for tyre size and compute.

Re: TDI mpg vs engine temp

Posted: 08 Oct 2012, 15:56
by lloydy
You could be right mark, my local esso and sainsburys garage seems to let me get the most in on first click. My BP garage is not as good and can be anything from just touching the max line to being 5mm shy of it.
The way you fill up is obviously the most accurate and is the way I should do it. I just don't think I could keep to it, I just don't have the patience.(will just have to try to use same garage/pump) I think my economy will settle between 30-35mpg, which to be honest, with the amount of power I now have is good. I know on this last journey I think my mpg was a bit better than recorded due the variance, on the fill up before leaving it didn't get a full tank in and on return the fill up has taken it right off the gauge.

Re: TDI mpg vs engine temp

Posted: 08 Oct 2012, 16:44
by HarryMann
The way you fill up is obviously the most accurate and is the way I should do it.


It just doesn't matter....

first, click, last click any click in a storm as long as its nominally brimmed, IF

you follow the proper procedure outlined, which is:-

Long term plotting using uninterrupted raw data and continuous odo readings

Certainly I wouldn't entertain anything else for the Wiki :wink:

Re: TDI mpg vs engine temp

Posted: 08 Oct 2012, 17:59
by ninja.turtle007
Clive,you keep saying that it should be recorded by the Odo. I checked my trip meter against mine over a distance of around 480k and it was within 2/10 of a kilometer. Can some be way out?

I have a pile of receipts with the trip readings on that I must go through but I have yet to check my Odo against the satnav since having a different crown and pinion fitted. It read 7% under with 4:57 but it is now 4:86. I presume this makes a difference?

Without making adjustments for the Odo I get between 29 and 32mpg on most fills. Sometimes I get around 36mpg but on the next fill I will get mid- low 20's which puts it back in the 29-32 range.

I calculate my mpg at 4.54l to the gallon.

I'll put up proper figures once I go through the receipts.