1.4 TSI vs 1.8 TSI (Manual) on the road
- Thread starter J400uk
- Start date
You must be absolutely ragging the 1.4 TSi to get only 35 mpg. My average for the 6 1/2 months I have owned has been a true 45 mpg, the dash says almost 50 mpg but that is a liar.
Oh, wow... I am so sorry, so many different units that measure the same thing. I use the metric system so it got confused. Thanks for correcting me.
Don't worry! I have never really understood exactly what torque is, let alone how you measure it!
Someone once said, When driving into a wall the bhp defines how fast you will hit the wall, the torque defines how far will you carry the wall with you.
That's a good way of putting it, I always think of torque as world's strongest man and horsepower as Usain Bolt. Torque is ability to push weight and horsepower is ability to spin quickly. That's why diesels can have higher gearing and lower revs at high speed.
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The 1.4 is a great engine, I remember test driving it and being hugely impressed by its abilities. In the end I still went for the 1.8 though. I wanted a step up in terms of driving fun from my previous car, and the ride felt better in the 1.8 also.
If you have time, would be great if you'll share you fuel consumption stats
showthread.php?t=390716&page=7
To put it as simply as I can.
Before engines were invented everything was measured in horsepower (or manpower). If you had one horse you had one horsepower. Some horses were bigger and stronger than others but lets not get hung up on that.
When steam engines were invented the torque they produced was measured by seeing how much weight could be lifted at the end of a bar a foot long, that is why torque is expressed as lbs/ft.
But then as now no one could understand what that really meant, they understood horses thus the formula
lbs/ft of torque x rpm where the torque is produced = BHP
5252
(5252 is a constant that applies to all engines)
So to apply that to the 1.4 TSi and calculate the bhp produced at 3500 rpm where 184 lbs/ft of torque is produced
184 x 3500 = 122.6 bhp
5252
From that calc we can see that the new 1.4 TSi actually has the same bhp at 3500 rpm as the old 1.4 TSi had at peak rpm, that is why it feels and is so quick.
Since both the 1.4TSi and 1.8TSi have exactly the same max torque up to 3500 rpm they both produce exactly the same bhp. Only above 3500 rpm does the 1.8 TSi have an advantage, by 4000 rpm the 1.8 TSi is producing 140 bhp which is the same as the 1.4 TSi produces at its peak.
Thanks for that - quite the best explanation I have ever seen particularly as it links HP to torque which I had not previously considered.
That was a good explanation, I never knew they used torque to calculate horse power. So can you work it back the other way and find out how much torque the 1.4 and 1.8 produce at peak power?
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According to the brochure I was given when i bought my car the 2 cars (1.4 TSi and 1.8 TSi) have exactly the same gear and diff ratios.
Even if the didn't it would be irrelevant since we are talking about flywheel bhp and torque figures.
Just had a quick look myself and the ratios are indeed identical...
http://web1.seat.co.uk/static/brochures/SEAT_Leon_range_brochure.pdf?trid=SC (Page 21)
Although HP, torque and gear ratios don't tell a full story regarding performance comparisons.
Just downloaded current brochure. The gear ratios for the 1.4 TSi and the 1.8 TSi are still the same as they were 7 months ago and are identical.
See page 21 in the link, bottom left hand corner.
http://web1.seat.co.uk/static/brochures/SEAT_Leon_range_brochure.pdf?trid=5DR
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