Author Topic: A TDi to trash all petrol Golfs on earth!?!?!  (Read 10177 times)

Offline S11EPS

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Re:A TDi to trash all petrol Golfs on earth!?!?!
« Reply #30 on: 11 February 2004, 16:52 »
 ;D

Not me, would never aim those sorts of comments at anyone in particuclar, that would break JV's 'keep the peace' request.

It was a general comment posted to anyone who'll listen to my rantings ;)

But if a certain owner of a certain Golf wants wants to take note, that would be good  ;D

The greatest leveller of them all - the Carousel

golfvr6

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Re:A TDi to trash all petrol Golfs on earth!?!?!
« Reply #31 on: 11 February 2004, 16:55 »
What ya on about, a mk3 8v will piss all over your pd 150  :D

Offline mk3tdi

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Re:A TDi to trash all petrol Golfs on earth!?!?!
« Reply #32 on: 11 February 2004, 18:50 »
having opened the can of worms i'd like a word on durability

someone said that tuning will drastically affect the durability of the TDIs, not necessarily...

i'll see how my car goes, but the aforementioned Golf John drives runs 150bhp on the road and 190bhp in extensive track use, from an original stock 90bhp engine on a Mk3 which had done over 210k miles a year ago

so I think maintenance and sympathetic modifications are the major factors in durability, not final power output per se

however, the law of diminishing returns applies, the more you mod them the more you spend to counter the knock-on effects, and gains are finite... i think 150bhp is about optimum for the old 90bhp engine

glad to see the debate raging on... and GolfVR6 is far more open-minded than i thought!  ;D

golfvr6

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Re:A TDi to trash all petrol Golfs on earth!?!?!
« Reply #33 on: 11 February 2004, 19:02 »
Thanx
I do think the new diesel engines are impressive performance wise. However , how much more can you get out of an already very high compression engine?
This will always be the limiting factor on a diesel, it is the high pressure injection systems in use that have made these engines as powerful as they are.

Offline iball

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Re:A TDi to trash all petrol Golfs on earth!?!?!
« Reply #34 on: 12 February 2004, 07:37 »
I've never had the opportunity to drive a PD Golf of any shape or form unfortunately, but I figured it would be quicker in gear than the 16v, though Evo quote the 16v 0-60 time as 7.9, but that's beside the point. I'm a growing diesel fan, the latest engines are very impressive, my dad has always been a petrol head and for about the last 25 years has not had a car with less than 6 cylinders mainly because of the noise and performance, but even he has been swayed and just put an order in for a Merc E-class 320CDI!

If I was in the market for a Mk4 golf I have to admit I wouldn't even bother considering the petrol engine versions (unless it was an R32) as the diesels just make more sense from every angle, never mind, due to circumstances I'll just make do with my 16v, though I must admit I do love it to bits, and that's coming from a tuned Astra Coupe Turbo that I had before, the torque on it was amazing 4th gear at 30 mph and it would out accelerate most other cars you see on the road everyday and 4th would take you on to 130+ if I remember correctly. The beauty of the engine was that the peak torque came in at 1900rpm and stayed all the way to 6500 ish I think. In the real world torque matters more than bhp I think.

What is it they say, bhp is pub talk, torque wins races or something like that.

Offline jdro1978

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Re:A TDi to trash all petrol Golfs on earth!?!?!
« Reply #35 on: 12 February 2004, 08:31 »
The figure that most performance parts manufacturers quote is brake horsepower (BHP) increase. This is probably the most widely used term for describing how well (or not) that an engine is performing. While the BHP figure is a good basis to determine how well an engine is performing, it is not the best to indicate how strong the engine is. BHP indicates the rate at which an engine will produce power, i.e. the more BHP the quicker you can move through the rev range while on the road. The other (and ultimately more important) figure to know is the torque output. Torque is a measure of energy transmitted at an angle perpendicular to a point of origin, or turning force generated at the crank.

          So, what is the difference? Well, the more torquey an engine, the easier it will be to tow heavy loads, overtake at motorway speeds and drive uphill, etc.. The more BHP, the quicker you will be able to accelerate or change speed. One of the lesser know facts amongst the automotive world is the difference between petrol and diesel engine cars. What you will normally find with petrol cars is that the power (BHP) and torque (lb/ft) figures follow each other quite closely. For example, an Mk2 GTI 8V Golf has a stock power output of 112BHP and torque of about 120lb/ft. Diesel engines however, follow a different trend. The process of burning diesel produces more energy than petrol, but has been deemed somewhat less desireable because of higher emission levels (until recently) and higher noise levels. Diesel cars can usually produce torque figures that are around double their power figures. For example, the new Passat 2.0 TDI produces 130BHP and over 200lb/ft torque. What you tend to find is that a petrol engine will have more power than a diesel engine of similar displacement and aspiration, but the torque delivery is totally the other way round. This is why the Mk4 TDI kit car caused so much of a stir in the WRC, where its 300lb/ft engine was a cause for concern amongst its predominantly petrol based competition. Uphill, there was no stopping it.

Diesel technology has progressed over the last couple of years, meaning emissions are now at an all time low and in some cases lower than some petrol engines. But they are still quite noisy. Manufacturers seem to be stuffing their diesel cars full of sound proofing, which only reduces the power to weight ratio of their cars. Modern cars are getting heavier, not lighter, but a lot of this is due to ever changing laws meaning more and more safety features. Safety is a big seller of cars. Fortunately, car manufacturers are making their engines more powerful to cope with the extra loads, and this seems to be an even bigger seller!

So, when the time comes for you to buy a new car (you won?t be selling the GTI though, right?) would you consider a diesel? Just think of the bags of torque at your disposal. Improved fuel economy. ARE YOU MAD? IT?S A DIESEL! Get back in your GTI and go for a long drive.



Read my thread above

golfvr6

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Re:A TDi to trash all petrol Golfs on earth!?!?!
« Reply #36 on: 12 February 2004, 15:47 »
Yep torque is what you feel, but torque at low rpm won't make you go fast, at high rpm it will.
High rpm and high torque = high bhp.
So i would go on that figure.

Offline tornadored

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Re:A TDi to trash all petrol Golfs on earth!?!?!
« Reply #37 on: 17 February 2004, 00:15 »
Power to the Diesel  8)

Who loves paying an outrageous 70%++ tax on fuel ?

No spark plugs, distributors, timing issues ...

As for that Torque  ;)
All Torque and no Traction ?



golfvr6

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Re:A TDi to trash all petrol Golfs on earth!?!?!
« Reply #38 on: 17 February 2004, 10:39 »
No timing issues? how about pump timing?
diesel engines are unlikely to outperform petrol engines because diesel simply isn't as combustable as petrol.
Sorry lads  ::)

Offline Bodhi

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Re:A TDi to trash all petrol Golfs on earth!?!?!
« Reply #39 on: 17 February 2004, 19:35 »
Pimpster has it bang on (I know I'm bound to say that, I've got a PD150)

The 0-60 time is a useless indicator to everyday performance. Once I leave for work in the morning, I don't stop for an hour and fifteen minutes before I arrive at work. So what relevance does the 0-60 time bear on my journey? Answer, none at all.

 What indicates real-world performance is your ability to overtake in-gear, in which the PD cannot be beaten by any standard golf unless its running a VR6 lump, because of its torque.

Bodhi, whether you like having to change gear at 4k rpm or not doesn't make it a slow car, its still fast. OK, so you don't find it as pleasurable as hanging onto the revs and bouncing off the limiter at 7000 rpm, but that's subjective, not objective. Objective is which is faster, which is the PD

Additionally, whilst the 8.6 second 0-60 time is what VW publish for the PD, pick up any mag that has done an independant test and you'll see 8 seconds dead for the PD and some have managed high 7's.

As for the 0-60 time you  quoted for the 16 valve, where did that come from? As we learnt form an earlier post, the VW claimed 0-60 for a Mk3 16v is 8.7 not 8.0 seconds. Thats in the handbook. This makes it slower than the PD150 across that benchmark. I also doubt whether a Mk3 16v (of which the youngest is now getting on for 6 years old) is still capable of re-producing the times it was capable of when new. They may loosen up as they get older, but that doesn't automatically equate to quicker.

Frankly, I'd put money on which was faster over any performance benchmark, and if you turn up to a meet with a strip, then I'll show you by just how much.

Alternatively, if you want to come on a track day, I'll be happy to demonstrate just how 'poor' the brakes are and how the 'soggy' handling affect a lap. Just bring your Bi-noc-ulars mate, you'll need them to see which way I go.

Speaking just for myself, I think you are one of the many blinkered people that can't stand to be driving a car that can be beaten by a lowly diesel. But please, don't feel bad, there's lots of you out there. Join a self-help group and together you can discover that the Mk3 16v isn't at the top of the pile anymore. Not saying the PD is, but it is faster.


I don't feel in-gear acceleration times are a good reflection of a car's performance taken on their own tbh, they only indicate short bursts of acceleration, and give very little idea of how the performance is sustained, unless you look at every gear between every speed. 0-60 covers a much larger speed interval, hence gives you a better idea of the spread of the performance (as do 0-100, 0-125 and for proper quick cars, 0-180). Now I will admit the diesel will give much better in gear acceleration than the 16v, yet by the time the 16v gets to 60 it's ahead (Evo quoted 7.9 for the 16v and 8.7 for the PD150). I'm willing to bet that's because the 16v has a wider rev range to work with, hence requiring less gearchanges. Whilst a diesel does really rip between 1500 and 3000rpm, its doesn't rip for very long, at which point is becomes asthmatic and weezy. But then of course you can always slot another gear. But why should you have to? A powerful petrol engine will whip round nearly is quickly (I'm using a 325i/328i as a benchmark here - I'm sure something such as a Clio 172 or an R32 will be similar) and then keep on going, sustaining the performnace for longer without a break for a new gear.

Anyway vr6 has hit the nail on the head, diesel engines will never be more powerful than petrol - it's a simple fact. I also doubt we'll ever see a diesel Lambo or Ferrari (we may see a diesel Porsche - after all, they built a bloody SUV), or a diesel Formula 1 car (I doubt Williams Massey Ferguson would have much success).

S11EPS, I fail to se how you can try and take the high ground, as you essentially tried to turn the debate round into a "My car is better than your car" debate, which is not only extremely childish, but also not even close to my original intentions. They aren't even in remotely the same class tbh, being an ever so slight price difference between a PD150 and a Mk3 8v. Strange then, that I consciously chose to buy an 8v, yet I can never ever see me doing the same with a PD150. There are far too many better and indeed faster cars availible for a similar price point (sorry to dissapoint you tho, they don't have VW or indeed BMW badges on the front). Oh and you won't need to demonstrate the poor handling and soggy brakes, I've already experienced plenty of those in the Bora. Which tragically enough is supposed to be a better drive than the Golf. Dear oh dear Volkswagen, you really stuffed up the Mk4 Golf. Luckily it looks like the Mk5 is going to undo some of the damage, the GTi in particular, is looking awesome.
1997 Tornado Red GTi 8v - The Fastest HotBox on Fife's roads.

Modifications -

1 x Kenwood KDC-7024M
1 x Dull Aluminium Golf Ball Gearknob. Clearly worth about 10bhp on its own.