BiTDI

[jbanfie]

Very interesting graph, and further evidence that you do want to change gear well before the rev limiter!!!

I'll check the recommended change point on the lap timer green and red bars thing to see where on your curve the recommendation comes. As you can imagine it all happens a bit quick, certainly in 2nd and 3rd, and by the time you are in 4th and the revs are high, you are going fast!

[robbyg]

Assuming the red line on the graph is the before plot? That implies about 340bhp and 700Nm before???

This is very tempting.... dont tell the wife, "yes dear, i just need to nip over to germany..."

My previous chipped turbo cars have all been 5-10% better on fuel after. Win/win.
However, 2 of the 3 had the software wiped during routine servicing, so you always need a free way to re-instate.

[DBLincoln]

Whilst you are correct, it is the graph that is not.

First run was just short of 300bhp.

[jbanfie]

Did a quick test of the change lights on the laptimer in manual mode.

First green bar on around 4000 rpm, by 4800 they are flashing red. I think riding to the limiter is pretty pointless!

[DBLincoln]

[QUOTE=jbanfie;767911]Did a quick test of the change lights on the laptimer in manual mode.

First green bar on around 4000 rpm, by 4800 they are flashing red. I think riding to the limiter is pretty pointless![/QUO

I realise now that VDCS is software based link that runs on a laptop...................would you explain in detail what you can add and how the laptimer shows when best to change gear. Does this also give the facilty to add a turbo boost guage?..............and anything else for that matter.

Thanks

[jbanfie]

DB, here's a link to the thread I put up a couple of months ago

VCDS Laptimer Fantastic

When you select it from the DIS menu and then push the gear lever over for manual, a set of 5 bars appear within the DIS, sadly not the head up display, these light up in turn once the revs are over about 4000, just like Micheal Schumacher gets in F1!!!!!!!

They eventually flash red.

It's a bit of an aid as you can then choose to pull the paddle or the lever when the second or third bar springs into life.

Yes you get a boost gauge, but when you put your foot down, it just rises to the top!

The other cool thing you can add is the needle sweep, where the two dial needles sweep all the way round and light the red led's for the rev limiter as they sweep past!

If you have the head up display this gets speed, oil temp and gear number - but no change lights and I think you loose nav maps in the HUD.

[jbanfie]

Just started to think about a trip to Holland and I find that they have pushed the price for the 313PS engine to 1250 Euros - not happy!

[belly buster]

Any updates on how the remap is going a few months in. Anyone else had a remap? Experiences?

[ukgroucho]

I was really interested in DBlincoln's remapping experience and some of the other discussion on the ZF HP8 gearbox in the A6 BiTdi derivatives (I'm on the brink of ordering an Allroad BiTdi - test drive on Monday). Anyway I started digging around and found a wiki article on teh engine and it got me wondering which specific HP8 gearbox does the BiTdi use. The wiki article (ZF 8HP transmission - Wikipedia, the free encyclopedia) claims the following
List of ZF 8HP variants

name	max. gasoline torque (N·m)	max. diesel torque (N·m)	examples
8HP30	300	300	-
8HP45	450	500	BMW 1 Series (F20), BMW 5 Series (F10)
8HP55	550	550	Audi A4 (B8), Audi A6 (C7)
8HP70	700	700	BMW 7 Series (F01), BMW X5 (E70), Range Rover Sport (2012)
8HP90	900	1000	Rolls-Royce Ghost,[21] Bentley Mulsanne

Transmissions in blue are used by Chrysler.

So the A6 (I assume BiTdi) has the 8HP55 - which is rated for 550N-m in a diesel ... seems odd given that the engine produces a max of 650 N-m. Makes me wonder if remapping the engine is a wise thing to do ..

Anyone got any comments?

[DBLincoln]

Hi Guys

I have now got some serious miles under my belt since the remap.

Car is fabulous although I ran the winter months on 'Cold Weather' tyres and wow what a fantastic difference they made .........particularly when it came to stopping!

So back on normal tyres and the 'bottle topping' on anything less than smooth roads really annoys……….anyone know a cure or do I have to learn to live with it?

Performance of the car still produces the idiot grin, but I have noticed that when ‘drag racing’ there appears to be a slip in the gearbox before it engages and then it really pulls. Have read about DSG gearbox tuning but has anyone had this done and would it cure it.

Best ‘take off’ appears to be in Comfort………..once slip has gone it flies but it is that slip lag that bothers me.

My son has a 535d and has just had switchable water/ethanol injection added……………….big difference.

Currently running a 5ltr Windscreen Washer bottle on 50/50 mix.

Would appreciate some feedback on the gearbox situation…………….anyone else had theirs remapped?

DBLincoln