[Vwdiesel] Quantum Mileage Pre and Post Re-ring

[mark shepherd]

Update to my  'new' Quantum wagon. All MPG's  UK man-sized ones ;o)



The trip last Saturday, was 137 miles long. All but about 10 miles were on 
the highway, travelling between 55 and 60mph.

http://img84.imageshack.us/f/rotationofimgp0034.jpg/

I have plotted three values for the trip's mpg, because I did what I 'never 
do' and put more fuel in after the first click. I paid for 10.15 litres of 
fuel giving me a good result of 60.9mpg. This is the best I have done with 
this car [engine], and, note when I bought it  perhaps 3 years ago, in the 
gold car only did 36mpg[uk]  Accurate gauge timing improved that up to the 
somewhat stubborn 45mpg  .region.

The other 2 black splodges on the graph represent differing amounts between 
the fuel pump click off. I've guessed 0.3litre and 0.5 litre as a safe 
range. This gives me a fantastic 63.6, or an unbelievable 65mpg.

Either of the two estimates, exceed anything I've ever had in 15 years of 
driving 7 Quantae.

I've not marked it in, but the most economic Quantum; which is the Fastback 
1.6n/a, only does 64mpg at 55mph according to the handbook.



So, what can I do to improve things?

1)     I could take out the 30kg of tools, which I obsessively carry around 
in the back..

2)     I could try a pure highway run, and maybe drop cruising speed down to 
50mph

3)      I could try driving with a disconnected LDA.

4)     My injectors are old, and the nozzles have wear marks from erosion; 
they were out of a Ford, and break pressures are low, 125bar for 3 and 
130bar for 1. However, they do not have leak off, but they could be matched 
better, to avoid pistons fighting each other around the flywheel.

5)     As previously mentioned a lightweight trailer could assist too.

6)     A rebore, and $2000 spent on new parts might get me something. ;o)



I shall keep adding to the graph from time to time,



Interestingly, I don't think all my gains have been down to the rering. I 
have recently created a new method for finding the 'best' timing, that I 
think always gives the optimum economy, and has also increased my power, 
[whether or not this is optimal power for any setting I'm not sure, but it 
is an improvement.]. I'll keep quiet about it until I'm more sure about the 
results.

----- Original Message ----- 
From: "mark shepherd" <mark at shepher.fsnet.co.uk>
To: "vw fans" <Vwdiesel at vwfans.com>
Sent: Tuesday, September 21, 2010 3:53 AM
Subject: [Vwdiesel] Quantum Mileage Pre and Post Re-ring


>
>
> http://img153.imageshack.us/img153/8340/imgp0006z.jpg
>
> It's early days yet, but  note the improvement in economy of 10 to 15%.
> Also note the early pre rebuild good and bad results. These were due to 
> towing. The first two over 50 was the only time this engine had done so, 
> and was down to steady driving at about 55ish , and  towing a little 
> trailer of 3ft by 4ft by 2ft deep, which seemed to reduce drag on my Q 
> estate. How do I know it reduces drag? Well, in the driver area I have a 
> boost gauge,that shewed less boost when cruising with the little trailer, 
> than normallly without. The next result that was conversely only 35mpg, 
> that was due to towing a 4 birth caravan, which in that case was pretty 
> good I think.
>
> THe final measurement  that hit 59.4mpg was done over a continuous journey 
> of 35miles, traveling mostly 55 to 60, but also several miles over 70mph, 
> and hitting 80mph  for a mile or so. It was my first journey not including 
> 2/3  mixed town driving as well.
> Now I think about it, during the first four new measurements , I was 
> regularly pushing the engine, to bed in the rings, so now I can expect the 
> average mpg to increase further :o)
>
> Mark
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