changing gear at the correct tyme

31st January 2006, 04:29

to get the best out my 1.4 furio at wa rev should i change from 1-2,2-3 and so on.......

thankss

31st January 2006, 04:39

does it pull all the way to limiter? if it does find out what it limits at and change just before the limiter

31st January 2006, 05:11

peak power at around 5200 not much point revving past that as your not making anymore power.

31st January 2006, 06:31

5200!!!!

omg the highest ive ever put my furio thru is 4k

even then the engine was screaming to change gear!

if someone drives like this alot what do you think will happen to the car? blown engine?

31st January 2006, 17:17

ma furio pulles to about 5500rpm then change well in the lower gears at least!

31st January 2006, 18:19

my VTR was good up to 6000 in 1st and 2nd but after that it died at 5000 so I changed then...guessin a furio is quite similar

31st January 2006, 19:10

Quote:

Originally Posted by b0t13

5200!!!!

omg the highest ive ever put my furio thru is 4k

even then the engine was screaming to change gear!

if someone drives like this alot what do you think will happen to the car? blown engine?

thats what the limiter is there for. obviously you will have more of a chance of blowing it if you do it all the time but you just won't do it all the time! just do it if you got a purpose!

31st January 2006, 19:18

Not much point going over 5500 if that's where the power is .... It won't do it any harm to keep it buzzing around 5-6000rpm as long as it gets a regular service. My limiter is set @8000rpm but peak power is @7600rpm , not much happens after 7600rpm

31st January 2006, 23:24

My furio is good up to about 5.5-6k not much more happends after that apart from the engine telling me "change gear u dick"

Sounds nice though at about 3.5k taking off to 6k in second and third with the induction kit and twin exhaust

1st February 2006, 01:06

ah ok, mines gonna get a basic service when i got the money, need to pay for a new bloody head gasket!!

1st February 2006, 01:09

just screw it till you hit the limiter,haha. just make sure you change the oil ofter and you will be fine, mine is now on 91,000 and ive never had a engine problem (touch wood) and it ment to be running 133bhp

1st February 2006, 01:14

wkd !

loving the intake on ya pic ^^

1st February 2006, 02:12

You should aim to shift so that the engine rpm lands in the peak torque region, around 3,500rpm depending on model.

Torque is what determines the rate of acceleration not power.

1st February 2006, 06:12

so hows ur 1.5D hehe

sorry but i find it funny

1st February 2006, 11:25

acceleration is off the scale, lol.
Just out of interest is there anyone else with a mighty 1.5D?

1st February 2006, 16:51

whats the peak on a vts seen as this subject is up

1st February 2006, 17:50

around 6600 i think, cant remember exactly might be wrong

1st February 2006, 18:06

1.1

60bhp @ 5500rpm
69lb.ft @ 3500rpm

1.5D

58bhp @ 5000rpm
70lb.ft @ 2250rpm

1.4

75bhp @ 5500rpm
88lb.ft @ 3400rpm

1.6 8v

100bhp @ 5700rpm
100lb.ft @ 3500rpm

1.6 16v

120bhp @ 6600rpm
107lb.ft @ 5200rpm

1st February 2006, 18:08

may sound thick here but whats the diffrences mean! i mayaswell learn now

2nd February 2006, 01:31

Yeah no worries man,

Ok geek mode time:

TORQUE:
The only useful 'thing', if you like, that an engine produces is torque nothing else, an engine does not produce power.

When you mash the accelerator to the floor and start to increase in speed that feeling that you experience is due to the torque produced (or force applied) by the engine.

The more torque (force) produced by the engine, the quicker the rate of acceleration.

If you remember science at school...
F=MA
force = mass * acceleration

so if your mass remains constant, the acceleration increases the more force applied.

POWER:

Power = Torque * RPM

Power is a function of torque and RPM - hence why most reciprocating engines have power towards the end of the rev range.

If you look at rolling road figures you'll see that torque peaks at roughly half way along the rev range on a non turbo engine and then slowly trails off.

F1 car engine despite having loads of power (+900bhp) actually have relatively very little torque, around the same as ferrari (which 'only' has around 350bhp) but because they can rev like a bastard to 19,000rpm is why the power figures are so high.

So....

Torque determines your acceleration (depending on gearbox set up)

Power determines your top speed (again depending on gearbox set up)

I CANT BELIEVE I KNOW THIS SHIT... im off to shoot myself. Any other questions then fire away.

2nd February 2006, 01:34

Nice

2nd February 2006, 01:35

so what does all this mean

lol

2nd February 2006, 01:45

i'll just take the 12bore out of my mouth, lol...

More torque = quicker acceleration (generally)
More power = higher top speed (generally)

I should have just said that shouldn't i? fook.

2nd February 2006, 01:49

Ohh right yeah why didnt you say that! lol

2nd February 2006, 02:06

Quote:

Originally Posted by GreenSaxo

1.1

60bhp @ 5500rpm
69lb.ft @ 3500rpm

1.5D

58bhp @ 5000rpm
70lb.ft @ 2250rpm

1.4

75bhp @ 5500rpm
88lb.ft @ 3400rpm

1.6 8v

100bhp @ 5700rpm
100lb.ft @ 3500rpm

1.6 16v

120bhp @ 6600rpm
107lb.ft @ 5200rpm

Any one know what it is for my little 1.0i lol

2nd February 2006, 02:07

I believe he has already said m8..

1.1

60bhp @ 5500rpm
69lb.ft @ 3500rpm

2nd February 2006, 02:08

no mate thats the 1100cc im after the 954cc 1.0i

2nd February 2006, 02:09

Doh im so fkin thick.. I thought you said 1.1 and not 1.0

2nd February 2006, 02:37

1.0

50bhp @ 6000rpm
54lb.ft @ 3600rpm

2nd February 2006, 03:05

Quote:

Originally Posted by Ant_Jackson

Not much point going over 5500 if that's where
the power is .... It won't do it any harm to keep it buzzing around 5
-6000rpm as long as it gets a regular service. My limiter is set
@8000rpm but peak power is @7600rpm , not much happens after
7600rpm

Always handy to have a resident rally driver handy!!

2nd February 2006, 03:18

So after all that talk( no pun intended)

, why does the 1.1 with less torque pull away faster than the diesel?

2nd February 2006, 04:27

so for my 1.4 sax with 88lb/s of torque,

so i should change gear at 3400 revs to get the most out of my car?

2nd February 2006, 22:48

Quote:

Originally Posted by Chris_Mcj

So after all that talk( no pun intended)

, why does the 1.1 with less torque pull away faster than the diesel?

I assume you mean my diesel?

lol
Yup, this is because a petrol engine has a higher rpm than a diesel engine, diesels are limited to around 5000-5500rpm with between 1500-4000rpm actually any use as the torque tends to die off pretty rapidly after 4000rpm. Petrol engines on the otherhand usually have a much wider rpm range, on a 1.1 it goes up to a useful rpm of 6200.

This is where is can get a bit OTT so sorry in advanced, also I'm just guessing mph @ rpm for the example below. Basically is boils down to the ratios of the gearbox...

So lets say 1.5D and a 1.1 had 1st gear reaching say 20mph at their max revs for each, so 4000rpm (1.5D) and 6200rpm (1.1). If they had the same gearbox in them the 1.1 would end up going to a higher speed in first because it can rev higher. so what happens is the engineers have shortened the ratio(s) on the 1.1 in order to have 20mph @ 6200rpm whatever.

Now this is the nasty part...
Now each gear in a gearbox acts as 'Torque Multiplier'. As i said in the previous post More torque = more acceleration, so first gear is obviously the highest multiplier (greatest acceleration) and 5th is the lowest multiplier (slowest acceleration). So in actual fact at the wheels of a 1.1 will have more torque than the wheels of a mighty 1.5D hence why it will accelerate at a higher rate.

With an F1 engine, like i said before they have the roughly the same torque as a road ferrari, but because the engine can rev to 20,000rpm the ratios on the gearbox can be MEGA short and thus have a huge torque multiplier which gives the massive acceleration.

Also you'll find that a 1.5D would be better at overtaking than a 1.1, so 30-50mph and 50-70mph would be quicker as the higher ratios tend to become similar.

AND also a 1.5D engine is heavier than a petrol engine of similar power thus the increase in weight will so the bugger down.

Dont beat me up if you ever meet me please

2nd February 2006, 22:58

Quote:

Originally Posted by b0t13

so for my 1.4 sax with 88lb/s of torque,

so i should change gear at 3400 revs to get the most out of my car?

no mate, you want to change gear so that the revs land at peak torque (usually), it depends on how the gearbox has been setup.

I would say aim for change that lands the revs at about 3500-3800rpm, without ever driving a 1.4 i can't really give you a 100% correct answer.

I could give you a massive (like the ones above) explanation on how to get the best acceleration through the gears but i really would have to shoot myself then.

3rd February 2006, 01:53

lol ok thnx