Introducing George

[320touring]

Certainly getting this thing together-good work!

Sounds like you're still climbing then..

As for the P&G i feel that such a small lump is probably so small as to be almost inconsequential in its consumption?

A good thing to do is to plot out what each tank would have cost at the published MPG figures, then work out what you saved..

That gives you an idea of what you can write off as "modding money" for the car

My iS with no mods has still spanked through £2300 inc purchase/roadtax parts and fuel in the last 9000 miles and 7 months the fuel would have been nearly £250 more

[Arragonis]

Latest update.

I did a trip to Glasgow and back after the last fill and it looks like George is not liking motorways much with my weak technique.

The first bar on the fuel gauge went at about 112 miles (120 is the the baseline) and the SG2 (adjusted after the last tank) "predicted" MPG (fillup now vs miles) is only around 55 MPG (imp), so I think this tank may pull me down a little.

I need to work on the technique for motorways (aka freeways) or any road with a speed of over 55. I did this trip with a constant throttle and a speed range of 55-65 but with the main motorway in Scotland being limited to only 2 lanes there is no quiet period to try P&G or DWL - I tried to find a truck and then followed it - not close enough to draft, just close enough so that traffic passing would know there was something slow there.

So this tank will be low unless I can refine techniques to get MPG higher before I fill up next week.

On the plus side this trip was for business which I can claim back from work at 45p a mile... Which will go to other expenses.

[Arragonis]

Latest tank is slightly lower as I thought the motorway driving would do. Need to work on speed technique.

[320touring]

Awesome work on the 45p a mile!!

They took our car user allowance away here..

As for Motorway driving, using constant speed and DWL in the iS saw me approx 50 miles LESS than P&G..

[Piwoslaw]

I took my Grandma's Corsa for a short ride today and I have another question regarding your 1.0 engine: After pulsing and throwing it into neutral, does it take its sweet time to get back to idle rpm?
Maybe it's the engine itself, or maybe all gassers compare similarly to turbodiesels, but my 1.6HDi goes from 2000rpm down to 800 in about 1/3-1/4 the time
When driving the 1.0 gasser today, on a few occasions the engine would still be above idle rpms when I was ready for another pulse after a shorter coast. And it didn't even have that many rpms to lose since I kinda kept it in the diesel range (1500-2500, instead of 2000-3500).

[Daox]

I've noticed newer cars do this. My Paseo idles right down to 750. My 2003 Matrix I had slowly idled down to ~1200 and wouldn't drop down to 750 unless you were nearly stopped. My Aveo idles down to 750, but it takes its sweet time getting there.

[Arragonis]

Originally Posted by Piwoslaw

... After pulsing and throwing it into neutral, does it take its sweet time to get back to idle rpm?...

Yep - I think I posted this on your 307 thread - you notice this more when switching from Diesel to Petrol. The opposite is also true - people used to Petrol also notice the way Diesels die back to idle very quickly.

I think it is down to compression - diesel engines have higher CRs so they have more resistance even when no fuel is put in. They also have heavier flywheels but that is only meant to keep them going at idle.

For older engines I think they still had a heavier flywheel plus more internal friction - e.g. OHV vs OHC and different cam follower / bearing designs.

I do notice it the most when trying P&G - I go to the dizzy end of 6K+ rpm and it takes ages to drop down again.

[Arragonis]

Some aero thinking - P&G would be nice but the G bit is lacking at anything over 60, so after re-reading PWs 307 thread I wondered about adding something like he has to the rear - I pause before calling it a Kamm back, more my feeble attempt. I also imagined covering the rear wheels.



I don't know how to attach this as the rear tailgate is a glass hatch as seen here



I also looked at the front. George is quite clean there, only the green bit in this pic is open, and the radiator behind is super tiny.



Underneath, I don't think there is a belly pan in there.

[320touring]

Dem is some 1337 paint skilzorz!

Could mount the kammback onto the boot hinges- as they're external to the roof?

ANd that underside is helluva messy

[Piwoslaw]

Originally Posted by Arragonis

Now that's finally starting to look good!!

I wonder if it can be attached to the rear glass somehow? I'm not sure exactly where the pivot points are, but I can imagine two possiblities:

1. The Kamm is just stuck to the rear glass.
2. The Kamm has its own set of hinges, higher up than the glass's pivot point, and swings up to allow the glass to open. More complicated, I'm afraid

Of course, the Kamm wouldn't be flush with the outer edges of the glass (as in my P307's case) but would need a 'front wall'.