I'm trying to work out what the differences are between the 70 and the 80 1.4 TDi. (and other higher power variants in the Audi A2, for instance)

Do they have slightly bigger injectors, or other more complex arrangements?

I presume there are unlikely to be differences in braking or running gear...?

I'm trying to work out what the differences are between the 70 and the 80 1.4 TDi. (and other higher power variants in the Audi A2, for instance)

Do they have slightly bigger injectors, or other more complex arrangements?

I presume there are unlikely to be differences in braking or running gear...?

nobody?

They do have different turbos, I've discovered. The 80 has a variable vane - but I'm not sure if the 70 is too, or is an earlier wastegate turbo. Can anyone throw any light?

Hi

Welcome to Briskoda.

The questions are too technical for me so cant give any answers, I think a remap would be advisable if you need more power. The roomster is a good choice and its good not to be driving a run of the mill car.On a trip from northern England down through two thirds of France last year I only saw one other roomster. Funnily enough I was thinking the other day that if I didnt need the roominess I would maybe try a Panda 100hp.

Hi pondweed,

Mechanically these engines are identical, save for the variable turbo charger, as you've already said.

Initially there was only one - 75 bhp - version of this 3-cylinder engine, as in the A2. However, upon discontinuation of the naturally aspirated 1,9 SDI diesel (which also had 69 bhp/51 kWt), VW needed a substitute for this engine to take the place of an entry-level diesel. So they have introduced two versions of the 3-cylinder 1,4 TDI - 51kWt and 59kWt. The engine with the power limited specifically to 51 kWt addresses also the demands of certain markets where higher taxes apply to engines with power exceeding this threshold.

Generally, the difference between the engines is in the software (this becomes particularly obvious if you compare the torque curves of the two engines - that of the less powerful engine is "cut" at 155 Nm, so you get an even line from 1600 to 2800 rpm). For this reason, remapping this engine to get 80-90 bhp will hardly do any harm.

brilliant answer Rahab. thanks.

I've just had the thing delivered 30 mins ago and I' m impressed at how torquey it is for what it is, in the same way as the old SDi Golf was too. Cutting off the peak means in many ways that it is even more even in its power delivery!

So is the turbo on the 70bhp the old Garrett one, or a less powerful variable?

Great, enjoy your new car!

The 70 bhp version uses a simple turbo with a by-pass.

A strong point of this series of diesel engines is they have a cast-iron cylinder block (just as the 1,9 TDI on which it is based), so, unlike all-aluminium motors, these ones are much more likely to survive overheating.

Another point that would be good to be discussed here is the Dual Mass flywheel and which 1.4 models (if any) have them. I'm presuming the 70 does not, but what about the 80?

I also notice the 70 is definitely free of a particle filter - - are there any on 1.4s of higher bhp?

Basic is best....

Another point that would be good to be discussed here is the Dual Mass flywheel and which 1.4 models (if any) have them. I'm presuming the 70 does not, but what about the 80?

I also notice the 70 is definitely free of a particle filter - - are there any on 1.4s of higher bhp?

Basic is best....

on the issue of DMF's they seem to be two plates with a spring round the outside to cushion the torque as the engine starts, call me old fashioned but i thought that was the reason for the springs in the middle of a clutch friction plate so why do we need these expensive fault prone DMF's?

peter

on the issue of DMF's they seem to be two plates with a spring round the outside to cushion the torque as the engine starts, call me old fashioned but i thought that was the reason for the springs in the middle of a clutch friction plate so why do we need these expensive fault prone DMF's?

peter

Reduce vibration at lower revs or idle. if you didn't have one fitted, tickover would cause a lot of vibration in the cabin. The reliability of them seems in question but then it would on here as this is the place people come to post their faults especially after they ahve remapped and seem astouded when one component doesn't like the extra demand placed on it. I doubt 1.4 is never really going to trouble the standard DMF even remapped.

so Decron, are you confirming they (1.4) all do have DMFs?

I have deliberately avoided them on the PSA HDi 90 variants and the Fiat/Vauxhall 1.3 Multijet 70bhp - both also avoiding the DPF in these low bhp versions!

Edited 12 January, 201016 yr by pondweed

Reduce vibration at lower revs or idle. if you didn't have one fitted, tickover would cause a lot of vibration in the cabin. The reliability of them seems in question but then it would on here as this is the place people come to post their faults especially after they ahve remapped and seem astouded when one component doesn't like the extra demand placed on it. I doubt 1.4 is never really going to trouble the standard DMF even remapped.

having potential DMF issues on my wifes fabie vrs , unmodified as delivered from factory, ford focus diesels suffer lots of dmf issues as well

peter

Another point that would be good to be discussed here is the Dual Mass flywheel and which 1.4 models (if any) have them. I'm presuming the 70 does not, but what about the 80?

I also notice the 70 is definitely free of a particle filter - - are there any on 1.4s of higher bhp?

Basic is best....

Yes, that's a good point - the 80 bhp version has a DPF filter (as an option in certain markets), and this is certainly best shunned in a car that is mainly driven in town.

This comes from a personal experience - in our family we have another VAG diesel car with the DPF (2.5 TDI R5), which is a great car all around, but a nightmare in town because the particle filter gets clogged in traffic jams, and it is a race against time to get to a motorway to clean the filter.

Edited 12 January, 201016 yr by Rahab

you've made me a very happy man saying that! Boy, am I pleased with this car. Its as basic as a basic thing after coming back from advanced basicness training. And it feels so lively in an early MG Midget sort of way . Just a pity I cant get any radio channels...

having potential DMF issues on my wifes fabie vrs , unmodified as delivered from factory, ford focus diesels suffer lots of dmf issues as well

peter

Thats bad news there

so Decron, are you confirming they (1.4) all do have DMFs?

I have deliberately avoided them on the PSA HDi 90 variants and the Fiat/Vauxhall 1.3 Multijet 70bhp - both also avoiding the DPF in these low bhp versions!

Nope, I would have to look at Elsawin and the discs have been packed up :(

any further thoughts anyone?? I'd like to know about the dmf thing on the 1.4, for the longer term!

I posted on the FAbia side... answer...."1.4's have solid flywheel but a separate balancer as they are three cylinder."