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Old 23 November 2010, 16:32   #11
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DO NOT PUT BIO DIESEL into the car.

It will ruin it.......and be careful, most diesel includes a portion of bio diesel which will still ruin it.

This is particularly true for the PD or "Pumpe Duse" engines the more recent common rail ones are supposed to be OK.

Chris
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Old 03 December 2010, 06:30   #12
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Personally I'd steer clear of petrol versions unless you like garage forecourts!
That's very true, but then the fun you can have between the petrol stations with a petrol turbo isn't to be missed IMV
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Old 06 December 2010, 14:59   #13
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VWs 4-motion system is not the same as Audi's quattro system. The Audi S3, A3 quattro and TT use a Haldex system (same as VWs 4-Motion). Basically it's 2-wheel drive when on the straight. Any loss of traction and the haldex unit engages the rear wheels. The quattro system on the other hand is permanent four wheel drive. More details here. http://forums.audiworld.com/showthread.php?t=1986343

I've got a 2001 A4 (B5 model) 2.5 TDi avant quattro sport. The AKN V6 engine generates 153bhp. This is more than ample for pulling the RIBcraft 4.8m. It hauls like a locomotive, due to over 300Nm of torque available on tap, most of which can be utilised from a standing-start to 3,500rpm from the 6-speed box. The later A4 2.5 TDi models came with 180bhp and if chipped could be taken to over 220bhp, although I've heard a few horror stories about them running rough.

The VW Passat 4-Motion is a very nice car. Probably closer to an A6 in size. Roomier than the A4 for starters, (especially for rear seat passengers) and with a load bay that would put a transit to shame. Uses PD engine technology (130bhp), for cars up to 2005. Newer models with 2.0 litres gained another 10bhp. Personally I'd steer clear of petrol versions unless you like garage forecourts!
It depends on which way round the engine is - transverse engined cars have the Haldex system. Longitudinal engined cars have the Torsen centre diff permanent 4WD.

Don't know which way round the engines are in the Passat - but would suspect the diesels will be the same as the A4?

Plenty of fun to be had in a petrol A4. Especially if it's got a turbo. Or two
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Old 23 December 2010, 14:38   #14
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DO NOT PUT BIO DIESEL into the car.

It will ruin it.......and be careful, most diesel includes a portion of bio diesel which will still ruin it.
How?

Any more info?
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Old 23 December 2010, 15:28   #15
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A Haldex with Elsd is better than older Haldex, i know saab have it atleast.

Electronic something To give better grip on rearwheels...
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Old 23 December 2010, 17:43   #16
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How?

Any more info?
I believe there is a lack of lubricity in bio-diesel which is a problem when starting an engine from cold. It also can get past piston rings and start to polymerise the engine oil. There is also something to do with some rubber o-rings drying out. This is all web-info rather than personal experience I hasten to add. Some of the more advanced bio-diesel systems/conversions use a twin tank to allow the warm up cycle to be run on normal derv.
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Old 24 December 2010, 05:55   #17
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I believe there is a lack of lubricity in bio-diesel which is a problem when starting an engine from cold. It also can get past piston rings and start to polymerise the engine oil. There is also something to do with some rubber o-rings drying out. This is all web-info rather than personal experience I hasten to add. Some of the more advanced bio-diesel systems/conversions use a twin tank to allow the warm up cycle to be run on normal derv.
Just wondered as that's all we use on our works fleet.....
Will dig a little deeper
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Old 27 December 2010, 05:58   #18
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Just wondered as that's all we use on our works fleet.....
Will dig a little deeper
As far as I know diesel has 5% bio-diesel in it anyway. But I know PD engines can't run on pure bio-diesel, although some older injection pump diesels could (Audi 80TDi 1Z engine) for example would happily run on the stuff.
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Old 27 December 2010, 06:19   #19
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I believe there is a lack of lubricity in bio-diesel which is a problem when starting an engine from cold. It also can get past piston rings and start to polymerise the engine oil. There is also something to do with some rubber o-rings drying out. This is all web-info rather than personal experience I hasten to add. Some of the more advanced bio-diesel systems/conversions use a twin tank to allow the warm up cycle to be run on normal derv.
I mix 2 stroke oil in with my diesel at about 200:1 never done any harm and keeps everything lubircated nicely, engine runs a bit quieter too.
Have done this on my A3 tdi, 200tdi Disco and my brother runs it in his 300tdi Disco.
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