Top Speed In A 1.8Tdci Mk2?

[ben1191]

Driving down the autobahn today,I hit 125 (on sat nav)and still had more to give in the rev limiter,I thought they were electronically limited to 119?

What's the fastest You've been in one?

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[Stoney871]

70 ;)

[salsheikh]

125? what were the revs showing? on private track ive not even touched 110 as I wasn't too keen on high revving the diesel engine.

my Leon Cupra did 125 easily on the same track.

[ben1191]

125? what were the revs showing? on private track ive not even touched 110 as I wasn't too keen on high revving the diesel engine.

my Leon Cupra did 125 easily on the same track.

They were on around 3500,do you reckon it's been remapped then,I couldn't see it myself as the last owner was a vicar lol

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[Jockstar]

Vicar?!

I've never been above 80 to be honest as it's not the type of car that inspires me to drive fast (coilovers and a remap might change that!). If mine did a genuine 125mph I'd be over the moon because I'm not sure mine would be able to!

[salsheikh]

wow 3500 rpm. i'll have a look at my rpm next time Im doing 110 when I have a chance on the track

[ben1191]

I'm curious as too how fast it can actually go now lol

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[mixmasterlooney]

It will hit 130. When you've reached the limiter back off the gas and then hit it again do it about 3 times and the car will go beyond 110

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[FOCA]

I'm curious as too how fast it can actually go now lol

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Depends on the conditions - if it is a downhill or even a slight gradient, it can make a big difference, same with a slight tailwind - thats why record-breaking speed runs have to be on flat ground and have to go one way, then turn round and go in the other direction within a certain time to count

The distance/ time taken to reach the speed is important and many speed runs are done over a certain distance (like 2 miles) what is the point if it takes 20 miles to reach a top speed? its the speed that it reaches in a short (ish) distance that counts

edit - typo

[mixmasterlooney]

Btw the limit is there for a reason. A blow out at 120 will not end well

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[ben1191]

Btw the limit is there for a reason. A blow out at 120 will not end well

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Yeah that's a scary thing to think about,a blow out at any speed is dangerous though.my tyres are rated for 150mph though

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[TDCiST]

My old 1.8 TDCi Mk1.5 I hit about 116-7 on a trackday.

Havent been able to track the mk2.5 yet, so no figures :(

[footfistart]

You should be able to work out how fast it will go by seeing how fast it goes per 1000 rpm so for example my 1.6tdci does 33mph in 5th at 1000rpm. so in 4th gear my car accelerates to about 5k. so if tour good at math then you can work out what the theatrical. when car remapped car will have same top speed you just worked out but it will be able to have more of a chance to reach it due to more power and being able to over come the aerodynamics of the car originally if you get me. I can't think of another way to explain. at 100mph my car is doing just over 3k in 5th. hopefully this gives you an idea.

[footfistart]

You should be able to work out how fast it will go by seeing how fast it goes per 1000 rpm so for example my 1.6tdci does 33mph in 5th at 1000rpm. so in 4th gear my car accelerates to about 5k. so if tour good at math then you can work out what the theatrical. when car remapped car will have same top speed you just worked out but it will be able to have more of a chance to reach it due to more power and being able to over come the aerodynamics of the car originally if you get me. I can't think of another way to explain. at 100mph my car is doing just over 3k in 5th. hopefully this gives you an idea.

[FOCA]

You should be able to work out how fast it will go by seeing how fast it goes per 1000 rpm so for example my 1.6tdci does 33mph in 5th at 1000rpm. so in 4th gear my car accelerates to about 5k. so if tour good at math then you can work out what the theoretical. when car remapped car will have same top speed you just worked out but it will be able to have more of a chance to reach it due to more power and being able to over come the aerodynamics of the car originally if you get me. I can't think of another way to explain. at 100mph my car is doing just over 3k in 5th. hopefully this gives you an idea.

It does work like that, exept -

The peak power is at approx 4.1K, it may rev past that (especially in the lower gears,) but no more power is produced above tis, and at higher revs (than approx 4.1k) the power drops off

the higher the gear, the higher the load and the lower the tractive effort the gearbox acts as a torque multiplier so there is more torque available in a lower gear than a higher one (progreaively- the most in 1st, the least in top) - so there is less torque in 5th than there is in 4th, on top of this, the aerodynamic drag increases with speed - and it is the square of the speed, so if the speed doubles, the aerodynamic drag quadruples, -

So although the engine might rev to 5k in 4th, its unlikely to rev past its peak power in 5th (4.1k) unless the load is reduced (downhill, or a tailwind) , or the power is increased (remap etc- but the revs peak power is produced may not be raised- see link) - other factors come into it too like the final drive gearing, whether top is an overdrive, etc etc

http://www.mybluefin.co.uk/curves/focus16tdci110bhp.pdf

In fact, if you also change up at 4.1k rather than 5k, you will accelerate quicker as you are revving the engine past its peak power, + it is less liable to drop into the torque band (i used to do this all the time on my diesel, as a long time petrol owner (honda v6 vvt, no less with a statospheric redline, its hard to change old habits ))