Formula dynamics I think

Cliff

Member
Messages
174
Had a good look around under the dash put no box found.
Thanks to all of you for all the help and info.
I have noticed a couple of wires that are not connected in the FD loom, is there a wiring diagram anywhere as I would like to go though all connections pin outs to make sure thay are correct before plugging in an FD box when I find one. I have seen the You tube video but isn't that clear.
 

Cliff

Member
Messages
174
Looking at the youtube vid again I think the 2 wires hanging down which I think where FD#17 and FD#20 could be for when wiring for the ecm power module not for the DBW
 
Messages
342
Looking at the youtube vid again I think the 2 wires hanging down which I think where FD#17 and FD#20 could be for when wiring for the ecm power module not for the DBW

That would make sense as the DBW is one of the first mods people do to these cars.



——-\|/——-
2004 CC “Siluro” the Italian Torpedo
2011 Audi A4 “mafia mobile”
 

Cliff

Member
Messages
174
Pictures of the 2 wires
 

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Messages
342
Pictures of the 2 wires

Yep, that confirms it. This car has only the DBW installed. Which is excellent! Saves you the labor of the harness work if/when you decide to get one.
I strongly recommend it, to get the advantage of firmer shifts that save clutch life and improve sport driving.



——-\|/——-
2004 CC “Siluro” the Italian Torpedo
2011 Audi A4 “mafia mobile”
 

Cliff

Member
Messages
174
Yep, that confirms it. This car has only the DBW installed. Which is excellent! Saves you the labor of the harness work if/when you decide to get one.
I strongly recommend it, to get the advantage of firmer shifts that save clutch life and improve sport driving.



——-\|/——-
2004 CC “Siluro” the Italian Torpedo
2011 Audi A4 “mafia mobile”
Thanks for all help
 

MattWill

Junior Member
Messages
67
Does it really make the CC gear change quicker? I was talking to Nareman at Nuvolo who said, having driven one, that he couldn’t tell the difference.
 

CatmanV2

Member
Messages
48,539
Does it really make the CC gear change quicker? I was talking to Nareman at Nuvolo who said, having driven one, that he couldn’t tell the difference.

Not really. It makes the box shift as fast as it can at a different set or parameters. So it'll be shifting quicker if you're not pushing on, but if you're already in that >5k (I think) >3/4 throttle (again, from memory) then it's not going to make any difference

C
 

MattWill

Junior Member
Messages
67
Great, that makes sense. Driving without this yesterday at low speed in town the changes are slow but perhaps I’m just not used to it yet. So the DBW would quicken up these changes? Is that what they did with the GS model (think CC speed increased by 35%)?
 

mjheathcote

Centenary Club
Messages
9,033
Not really. It makes the box shift as fast as it can at a different set or parameters. So it'll be shifting quicker if you're not pushing on, but if you're already in that >5k (I think) >3/4 throttle (again, from memory) then it's not going to make any difference

C

Per the owners manual, >7k and full throttle.
You therefore have to ask yourself, do you really need a faster shift if not really "going for it"?
 

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Wanderer

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5,791
Does it really make the CC gear change quicker? I was talking to Nareman at Nuvolo who said, having driven one, that he couldn’t tell the difference.
TBH I cant tell the difference between normal and sports.........
 
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342
Per the owners manual, >7k and full throttle.
You therefore have to ask yourself, do you really need a faster shift if not really "going for it"?

Yes, the shift improvement is important. Well, for those of us who would rather not change out our clutch as often.
The DBW, as far as I can tell, tells the TCU to shift as if the car was at higher throttle demand, resulting in a firmer shift. Less time spent partially engaged. This significantly increases clutch life, delaying what is perhaps the most expensive recurring maintenance on this car.



——-\|/——-
2004 CC “Siluro” the Italian Torpedo
2011 Audi A4 “mafia mobile”
 

mjheathcote

Centenary Club
Messages
9,033
Yes, the shift improvement is important. Well, for those of us who would rather not change out our clutch as often.
The DBW, as far as I can tell, tells the TCU to shift as if the car was at higher throttle demand, resulting in a firmer shift. Less time spent partially engaged. This significantly increases clutch life, delaying what is perhaps the most expensive recurring maintenance on this car.



——-\|/——-
2004 CC “Siluro” the Italian Torpedo
2011 Audi A4 “mafia mobile”

Yes quicker shift, as per >7K, but not so sure on the partially engaged comment.
You have the time for the mechanical gear selection, faster or slower, but can't imagine the time for the clutch engaging will be any different. When driving normally when moving there is no advantage to slowing this down and allowing any slip especially with the rev matching too?
 

tulit

Member
Messages
110
If you look at the parts of the harness that the DBW is connecting to, it's simply changing the throttle position sensor value based on RPM. It can't be do anything else...

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Twinspark

Member
Messages
460
Yea what the DBW does is make it shift as if its on or very near WOT every time. It should help in theory at lower speeds but when you’re on WOT it wouldn’t be any different from my understanding.
 

mjheathcote

Centenary Club
Messages
9,033
If you look at the parts of the harness that the DBW is connecting to, it's simply changing the throttle position sensor value based on RPM. It can't be do anything else...

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Yes, to simply trick the gearbox ecu you are over 7K and full throttle.
Whether the original gearbox ecu has variable clutch engagement times at lower rpm's I don't know, apart from low speeds when taking off, when a bit of slip is actually necessary.
 

tulit

Member
Messages
110
I'm actually surprised it works as well as it does. It's feeding those modified throttle values into the ECM (which then sends the torque request to the TCM). I'd therefore expect the car to be jerky like you actually were flooring it.

If anyone has a obd tool and a DBW I'd be interested in seeing what the throttle position sensor value datalog looks like during shifts.

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tulit

Member
Messages
110
Yes, to simply trick the gearbox ecu you are over 7K and full throttle.
Whether the original gearbox ecu has variable clutch engagement times at lower rpm's I don't know, apart from low speeds when taking off, when a bit of slip is actually necessary.
It's not tricking the RPM. That's read only based on the harness tap ins.

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mjheathcote

Centenary Club
Messages
9,033
It's not tricking the RPM. That's read only based on the harness tap ins.

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It's got to tell the gearbox a higher rpm than actual or it won't make a faster change at lower rpm levels?