Torque vs kW

[Dolby]

Well if you're contantly getting in the 6s and 7s with your Polo, it stands to reason you'd take a 132kw GTI. Hell! I'd reckon you'd you give an Audi S3 a decent run up to 230km/h!

 

[I am Penguin]

Just to add,

A car's weight will also depend how fast you will be able to accelerate. Having high torque in a big / heavy car won't always mean it can accelerate fast.

Therefore I used to like seeing a Power to weight ratio value in reviews/magazines.

 

[Gnome]

So you think its all about revs huh
http://www.autoexpress.co.uk/carreviews/grouptests/226926/mercedes_cclass.html

Well look at the 0-100km/h time 6.5 seconds, that's not exactly impressive, standard for just about every modern petrol hot hatch with a turbo engine.

Secondly they compare a 2.8 N/A Petrol to a 3.2 Turbo Diesel and you are confused why the Turbo Diesel is faster? It's got 400CC and a Turbo on the Petrol engine.

You know alot about the inner workings of cars even in another thread about the cluth, you a mech?

No not really, didn't know anything about engines about 3 years back, then my previous Corsa had some engine trouble and I started trying to fix it, basically learned from the internet and a few helpful Opel guys, rebuilding my cars engine, did modifications, helping other people with Opels, etc. Which is why I'm more of a Opel guy, but the theory is the same if you slap a Opel logo on it or a Mercedes logo.

So you can call me a hobbyist

 

[Dolby]

I've learnt last night that an S2000 beats me quite convincingly :/

The 190KW remapping doesn't seem so bad now ...

 

[blaaislaai]

Therefore I used to like seeing a Power to weight ratio value in reviews/magazines.

+1

A 1.6 golf have beaten my 1.8i jetta. the golf is almost half the weight!

 

[Timken]

TurboDiesel or TurboPetrol? Big difference in driving styles and maintenance care required.

I can only comment on TD:

1. Regular oil changes. If your maintenance plan says service intervals at 15Kkm, change the engine oil every 7.5Kkm. Find out what oil they use and stick to it.

2. Always let your turbo spool down after a long/hard run by letting the engine idle for a few minutes.

how many of us drive long distance for the summer holidays, need to pee and pull into a petrol station and switch off to run to the loo? Don't

3. Fit an EGT if you can to prolong the engine.

4. Use low sulphur diesel

5. Remove the catalytic converter and/or middle silencer box and replace with a straight through pipe.

This will help reduce EGT, turbo will spool up faster and performance will increase.

best bang for buck performance upgrade on any TD

I drive a 1.9TDI A4. Any idea where I can remove the catalyst converter and who can fit an EGT for me? Wouldnt mind a bit more bang for buck, and an extra gauge in the car will make me feel like a boy racer. I stay in JHB, Alberton btw.

BTW, only diesel I use is Sasol, any other make and my car changes the weather from sunny to overcast on pull aways.

And what the guys say about turbo spinning down is correct. With the engine oil, the oil pump lubricates the shaft in the turbo. Since turbo spins under load and from about 1800rpm, it is safe to assume that standing still the turbo winds down.

When u kill the engine after hard drive, oil pump switches off since it is a mechanical pump, and the turbo no longer gets lubrication, causing the shaft to overheat, scratch, bend, u name it, it does it till it breaks.

 

[JK8]

I've learnt last night that an S2000 beats me quite convincingly :/

The 190KW remapping doesn't seem so bad now ...

Standard S2000? You have to be kidding... which model 2001?? Any S2000 after 2003 you should take easily.
Lol please race a Type R...

I drive a 1.9TDI A4. Any idea where I can remove the catalyst converter and who can fit an EGT for me? Wouldnt mind a bit more bang for buck, and an extra gauge in the car will make me feel like a boy racer. I stay in JHB, Alberton btw.

BTW, only diesel I use is Sasol, any other make and my car changes the weather from sunny to overcast on pull aways.

And what the guys say about turbo spinning down is correct. With the engine oil, the oil pump lubricates the shaft in the turbo. Since turbo spins under load and from about 1800rpm, it is safe to assume that standing still the turbo winds down.

When u kill the engine after hard drive, oil pump switches off since it is a mechanical pump, and the turbo no longer gets lubrication, causing the shaft to overheat, scratch, bend, u name it, it does it till it breaks.

Check out the VW club forum, Id recommend a downpipe and decat.

 

[xrapidx]

Standard S2000? You have to be kidding... which model 2001?? Any S2000 after 2003 you should take easily.
Lol please race a Type R...\

Cause you can beat a S2000 with your ptdi? I stock s2000 is around 7s up there if I recall correctly.

 

[Dolby]

Cause you can beat a S2000 with your ptdi? I stock s2000 is around 7s up there if I recall correctly.

From what I hear, they're pretty tight with a Golf 5 GTI ... and remember, those are pretty much nothing for a Polo GTI

Polo GTI > Focus ST (166kw)
Polo GTI > C30 T5 (169kw)
Polo GTI > Fiesta ST (112kw)
Polo GTI > Civic Type R (147kw)
Polo GTI > Honda S2000 (177kw)
Polo GTI > Golf 5 GTI (147kw)
Polo GTI > Golf 4 (GTI 132kw)

What can I add? You are aware you're 110kw, right? You're also aware that no test - coast or reef -has not been under 8 seconds ever?

JK8 - you have your figures way, way off. Are you sure anyone has actually been racing you? :/

 

[JK8]

From what I hear, they're pretty tight with a Golf 5 GTI ... and remember, those are pretty much nothing for a Polo GTI

Polo GTI > Focus ST (166kw)
Polo GTI > C30 T5 (169kw)
Polo GTI > Fiesta ST (112kw)
Polo GTI > Civic Type R (147kw)
Polo GTI > Honda S2000 (177kw)
Polo GTI > Golf 5 GTI (147kw)
Polo GTI > Golf 4 (GTI 132kw)

What can I add? You are aware you're 110kw, right? You're also aware that no test - coast or reef -has not been under 8 seconds ever?

JK8 - you have your figures way, way off. Are you sure anyone has actually been racing you? :/

Polo GTI > Focus ST (166kw) - I never said im faster than that...

Polo GTI > C30 T5 (169kw) - Its close, small cigar.
The rest are correct, except MK5 BWAs give me a hiding.

 

[koeks]

JK8 is the man

 

[xrapidx]

Polo GTI > Focus ST (166kw) - I never said im faster than that...

Polo GTI > C30 T5 (169kw) - Its close, small cigar.
The rest are correct, except MK5 BWAs give me a hiding.

You're kidding right? you think a pgt is faster than an S2000?

An S2000 is faster than everyone of those cars at the coast. At the reef a pgti would be no contest.

 

[Hogrod]

Polo GTI > Focus ST (166kw) - I never said im faster than that...

Polo GTI > C30 T5 (169kw) - Its close, small cigar.
The rest are correct, except MK5 BWAs give me a hiding.

How the stuff can a Polo GTI be anywhere near a C30 T5. Torque, kw, 0-100, top speed are way way below the T5

 

[koeks]

that's because it's JK8 driving it

 

[Dolby]

He can launch correctly

Even if we take 0-100 out of it, the Volvo will literally slaughter you beyond the 1st gear ...

 

[alpine]

Well look at the 0-100km/h time 6.5 seconds, that's not exactly impressive, standard for just about every modern petrol hot hatch with a turbo engine.

Secondly they compare a 2.8 N/A Petrol to a 3.2 Turbo Diesel and you are confused why the Turbo Diesel is faster? It's got 400CC and a Turbo on the Petrol engine.

maybe but what about power/weight ratio, the petrol is lighter which should give it the advantage ( 1575 vs 1700kg)

 

[alpine]

guyz the argument here is that diesel engines have improved in leaps and bounds, they produce a decent amount of kw and a lot more torque compared to their petrol counterparts

 

[alpine]

i mean have you seen the speedo on a merc(C) 220 cdi ... 240, for such a heavy car... now thats very decent

 

[Paul_S]

guyz the argument here is that diesel engines have improved in leaps and bounds, they produce a decent amount of kw and a lot more torque compared to their petrol counterparts

The basic diesel engine hasn't changed much over the last 10 years.
All that's changed is that they now slap a turbo onto a diesel.

If you want to compare petrol engines to diesel engines then you need to compare a turbo charged petrol engine to a turbo charged diesel engine.
i.e. Golf GTI vs Polo 1.9 TDI

2007 Mercedes-Benz C 220 CDI
Kerb mass : 1585 kg
Engine capacity : 2148 cc
Power : 125.3 kW @ 3800 RPM
Torque : 400Nm @ 2000 RPM
Total drag Cx : 0.59
0-100 km/h : 8.50 s
Top speed : 229km/h


2007 Mercedes-Benz C 200 Kompressor
Kerb mass : 1490 kg
Engine capacity : 1796 cc
Power : 135kW @ 5500
Torque : 250Nm @ 2800-5000 RPM
Total drag Cx : 0.59
0-100 km/h : 8.60 s
Top speed : 235 km/h

The petrol powered Merc with 352 fewer CC's is 0.1 second slower in the 0-100 sprint and has a higher top end speed than the diesel.
Almost 10kW more power with a considerably smaller engine.
The only thing the diesel has in it's favour is better drivability at low RPM and lower fuel consumption. Other than that the engine is heavier and maintenance more expensive.

 

[kkza]

As per the original topic:
KW is how fast you were going when you hit the wall
NM is how far you dragged the wall after you hit it
Understeer is when you hit the wall with the front of your car
Oversteer is when you hit the wall with the back of your car.