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Quote: Originally posted by Grampian91 on 16/10/2013

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1800 - 2000 is too high?

Got me curious now. I wonder at what revs does my car hits maximum boost?
Doesnt help that my OBD scanner maxes out at
approx 23 psi.

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On mine the tubo does not kick in until around 1800-2000 then increases the boost up the rev range until around 1.0 bar at 3000 revs then it reaches a point around 3500 to 4000 revs where it reaches max boost of 1.2bar when the wastegate will start to open.

In practice is it best to keep mine around 2000-3000 revs but it can shoot up to 3500 to 4000 if you decide to accelerate and the gearbox decides to change down 2 gears instead of just the one (I know, my heavy foot)

As for what gear/ revs to be in at any speed, I was taught, on the bike as well as the car, to be in the most responsive gear for your speed, ie a gear that if you lift off the throttle gives you engine breaking and if you have to accelerate gives you instant acceleration without having to change gear.

Quote: Originally posted by Grampian91 on 16/10/2013

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1800 - 2000 is too high?

Power will generally keep climbing until just past 4000rpm where it starts to taper and then drop off.

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Quote: Originally posted by Grampian91 on 16/10/2013

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You seem to be confusing more revs with going faster.

When i was learning to drive the instructor told me just because you change gear doesnt mean you have to go faster.

You can do 30mph in 4th as well as 3rd.

Change down a gear and the revs will be in the right spot.

You dont have to go faster.. Change gear.


The torque curve on a modern diesel is very steep. It goes from little to lots in a few hundred RPM.

Ive driven older diesels where they are virtually impossible to stall. Its easy to stall a modern diesel if you want to.

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Quote: Originally posted by listerdiesel on 16/10/2013

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Glad we bought a V8 petrol with a nice conventional Borg & Beck clutch and a solid flywheel .... :)

Peter

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Quote: Originally posted by tango55 on 14/10/2013

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Back in 2004 we had a brand new Vauxhall Zafira 1.8 petrol which in less than 12 months and about 5,000 on the clock had to have a new clutch fitted under the vehicle warranty. We did tow a caravan about half a dozen times a year which had a laden weight of only 1000 kgs. but generally Vauxhalls don't have a good reputation especially for towing. If you do any research on vehicle BHP and torque delivery they are not in the same league as other vehicles of the same engine size etc. and for that reason not that many caravanners use them. The people that do generally tow with them usually don't give a fig about the match or noseweight anyway and will hitch up regardlessly but once you have had a bad experience with a Vauxhall it puts you off for good. Have a look to see how many you see towing with a Ford Mondeo in a like for like comparison to a Vauxhall Vectra and you will find that the Mondeo is far more popular in more ways than one. Don't let the Vauxhall persuade you to opt for an auto just of a bad experience as I have had 2 Ford Focuses with a manual gearbox and now a Volvo V50 also a manual and have had no problems regarding the clutch or DMF.

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