Blown Diffuser??

[Richard]

Bar555 has done a really good analysis of the Ferrari exhaust configuration in the F10 thread...

viewtopic.php?p=186732#p186732

[mx_tifoso]

...

Mercedes haven't improved, Williams made steps forward without the EBD and without the EBD providing anything extra yet, and Force India have just bolted theirs on and don't seem to be doing so well. Who else is there? I've probably missed a team or two. ...

Could it be due to the Mercedes engine that the EBD has trouble working properly?

...
Couple that more difficult design with the vastly more complex diffuser that McLaren have then it's not so surprising it's taking a couple of races to perfect. Last race they ran it and have a good base line, hopefully the data from then and this race will give them what they need to take a good step forward in Spa (although isn't the factory shut for a couple of weeks? Or is that later in the year?).

Yes, the factories will be shut down for the summer break.

[gridwalker]

Could it be due to the Mercedes engine that the EBD has trouble working properly?

That is a very good point ... but what kind of characteristic could lead to reduced performance in this area?

[mx_tifoso]

I'm thinking the power/torque curve? Along with it not reacting well to the ignition retardation, if at all. Has the Merc engine even been fitted with the retardation programme?

[segedunum]

Could it be due to the Mercedes engine that the EBD has trouble working properly?

Well, when Newey was at McLaren he was told by Ilmor and Mercedes to stop routing the exhausts to blow directly into the diffuser. It might not be relevant but it's possible that Mercedes engines might be built with a certain philosophy in mind.

[jwielage]

I'm thinking the power/torque curve? Along with it not reacting well to the ignition retardation, if at all. Has the Merc engine even been fitted with the retardation programme?

I read a post the other day regarding an "engine mapping" issue for Q3, is this similar to the ignition retardation point you make. I understand what ignition retardation is per se, but I am unfamiliar with how it relates to the thread.

In sum:
1. Are the Q3 mapping & ignition retardation issues the same thing?
2. Can someone please explain this issue, or direct me to a good explanation?

Sorry if these issues are discussed elsewhere and I am just not finding them. Any help would be greatly appreciated. Thanks.

[mx_tifoso]

Yeah this has turned more into EBD talk than about the MP4-25, I think I will soon move some posts to the 'Blown diffuser??' thread (where you will find the Q3 mapping info).

The Q3 mapping and the ignition retardation are the referring to the same thing; they basically keep the engine "blowing" even during breaking/no throttle as to allow the EBD to do it's job constantly.

[jwielage]

The Q3 mapping and the ignition retardation are the referring to the same thing; they basically keep the engine "blowing" even during breaking/no throttle as to allow the EBD to do it's job constantly.

Great, thanks for the explaination.

[forty-two]

Interestingly, it seems that Adrian Sutil has perhaps confirmed the idea of a special Q3 engine map specifically to feed the EBD:

http://www.f1sa.com/index.php?option=co ... Itemid=157

You do notice the difference (of the blown diffuser), especially with the different engine mappings," said Sutil.

OR is Adrian Sutil merely a reader of this forum!