Quickest diesels?

[AstraOiler]

Alright, so i was told to post in here to get a bit more interest

Hey guys!
As the owner of an Astra diesel, i've seen and put into place some simple but effective tuning to completely transform the car, (162kw, 480nm at around 28psi, 0-100 in around 6.5 seconds)
But i was wondering what the tunability is like on the vdub oilers...as it's always in the back of my mind as a future car...
So who here has put some work into their diesel (even if it's just a tuning box) and what sort of figures are you getting?
Cheers guys(and girls)!

EDIT: Oh yeah, and as we all know power isn't everything, what sort of 0-100 and quarter mile times does this lead to?

[scotty1991]

Would also be interesting to find out what a chipped Audi A4 3.0TDI could do =o

[Logzy]

Alright, so i was told to post in here to get a bit more interest

Hey guys!
As the owner of an Astra diesel, i've seen and put into place some simple but effective tuning to completely transform the car, (162kw, 480nm at around 28psi, 0-100 in around 6.5 seconds)

What was the simple but effective tuning you did to the Astra?

[AstraOiler]

What was the simple but effective tuning you did to the Astra?

DieseltuningUK CRD-T tuning box (have it as a pre-release for testing, think it's just been released now) gave me 52kw and 160nm. Just basically adjusts the pressure in the commonrail and ups the boost. Other than that the only other performance mod is a simota carbon induction kit.
Don't know what it's like on the vdubs, but an exhaust gives absolutely no gains, nor does a FMIC on mine, so it'd be interesting to hear your experiences.

[Greg Roles]

Just so this makes sense, if you follow this dudes Diesel section thread, the Astra has the three advantages of the GT17 sized turbo ( GT size ) common rail ( FAR better fuel mixes ) and no DPF. An "ideal" for a VW!

[AstraOiler]

Just so this makes sense, if you follow this dudes Diesel section thread, the Astra has the three advantages of the GT17 sized turbo ( GT size ) common rail ( FAR better fuel mixes ) and no DPF. An "ideal" for a VW!

I'm not that mechanically minded. Can understand the differences, but not the specifics of the differences...Is the turbo considerably larger? what does the VW run if not a commonrail? and is the DPF really that much a restriction?
Cheers

[Greg Roles]

Seems your car has the hi po GT VW sized turbo, whereas the 1.9 and 103kw VW's have a 15 size (smaller). The DPF is an immense restriction, has NO straight through route, all gas has to pass 90 degrees through "walls" of platinum coated honeycomb, which makes the power output achieved stock simply amazing. Until the MK6, all VW's were PD mechanical injection, which doesn't allow as good a charge mix, and thus is less accurate, especially off boost. A lot more power gain is possible with common rail, but so too is it less tolerant of fuel quality issues. I'd hate to try and run bio through common rail just quietly.

Engine wise you have a lot of upside. Car wise.....well....

[Logzy]

The VW PD is NOT mechanical injection, it uses piezo electric injectors.
The injector pump pressurizes the fuel to a certain pressure into the injectors then the injectors pressurize it again.

Whilst they are great figures youre getting with the tuning box on the astra, id be a bit worried about the affect/life of the engine.
Tuning boxes just modify the signals from the sensors to the ECU to basically trick it by giving it false information. i.e telling it the pressures are not what they should be so need to increase.
But like i said, great figures nontheless. That must really fly.
All i need to do is get rid of the DPF

[Transporter]

Astras 82mm cylinder bore is one of the reasons why you can achieve good performance upgrade results very quickly with just tuning box. Its biger bores assure better breathing.
That compares with 79.5mm of the VW 1.9TDI
Also compression ration is good on Astra 17.5:1 so you can pack a lot of air with bigger turbo.
VW 1.9TDI has compression ratio 19:1, which limits its quick tune capability.
Longer stroke is not always advantage, since you get parasitic losses.

So, naturaly some engines have better tuning potencial right without too many internall modifications.

I thought that some of you might be interested.

http://findarticles.com/p/articles/mi_qa4078/is_200509/ai_n15614621/

[poyta]

The DPF is an immense

So is there anyway that we can just remove the thing? Anyone out there made a kit to remove this and modify the ECU to think its still there? I assume there would be issues with the car trying to regenerate itself.

Mine is really me - not so much from the potential power loss but the constant regenerations runs I need to do to keep it from clogging.

[Logzy]

Astras 82mm cylinder bore is one of the reasons why you can achieve good performance upgrade results very quickly with just tuning box. Its biger bores assure better breathing.
That compares with 79.5mm of the VW 1.9TDI
Also compression ration is good on Astra 17.5:1 so you can pack a lot of air with bigger turbo.
VW 1.9TDI has compression ratio 19:1, which limits its quick tune capability.
Longer stroke is not always advantage, since you get parasitic losses.

So, naturaly some engines have better tuning potencial right without too many internall modifications.

I thought that some of you might be interested.
http://findarticles.com/p/articles/m.../ai_n15614621/

How do bigger cylinder cores assure better breathing. Its the inlet and outlet ports, size of valves and opening travel of the valves that determine how well it breathes.

[Transporter]

How do bigger cylinder cores assure better breathing. Its the inlet and outlet ports, size of valves and opening travel of the valves that determine how well it breathes.

Bigger bore fits bigger valves, hence better flow or potential for better flow.

I know what you going to say but.. no cause
4 valves will have more losses due to friction.

I suggest that you read that article in previous post. It will explain it to you in greater depth and with more details.

[AstraOiler]

Whilst they are great figures youre getting with the tuning box on the astra, id be a bit worried about the affect/life of the engine.
Tuning boxes just modify the signals from the sensors to the ECU to basically trick it by giving it false information. i.e telling it the pressures are not what they should be so need to increase.
But like i said, great figures nontheless. That must really fly.
All i need to do is get rid of the DPF

The tuning boxes have been run on cars in the UK for upwards of 80,000miles...never been responsible for a fault
Easiest way to tell how quick it is...come on the combined vic cruise

[Greg Roles]

Sorry Logzy, you are indeed right, PD is "kinda" mechanical with the secondary pressure being cam driven. My bad. I am not up to speed with the older brethren and thus pure mech injection.

Poyta, it's an easy physical replace with a dump pipe, the trick is tricking the sensors and will need electronic buggery. There's already kits out there, but they aren't common over here as yet. Me thinks when the current crop totally clog, and people get quoted $5k, it'll become rather popular.

[Greg Roles]

How do bigger cylinder cores assure better breathing. Its the inlet and outlet ports, size of valves and opening travel of the valves that determine how well it breathes.

Put a 17 sized turbo on a 1.9 and I reckon it'd respond in a remarkably similar fashion. Seems the Astra is set up well stock, but hey, it's still early days for whats possible with the current VW's...