cold difuser vs hot blown defuser.

[chief350]

can anyone please provide me a link or explain in further detial the cold difuser set up that some of the cars are curently running????

[Mothers Worry]

http://www.jamesallenonf1.com/2010/06/european-gp-the-latest-tech-blown-diffusers-explained/

http://auto.cronews.net/2011/05/21/analysis-f1-front-runners-open-to-diffuser-protest/

http://www.redbull.com/cs/Satellite/en_INT/Article/tech-talk-blowing-hot-air--021243020336426

Hope this helps mate.

[Oldtony]

Well this onehas really blown up this weekend.
In an effort to ban exhaust blow diffusers (Read knobble Red Bull) the FIA announced a change of regulations, effective Silverstone, to limit throttle opening when of the power or decelerating. The idea of this was to stop "Hot blowing" which is the use of fuel reburned in the exaust to expand exhaust gas flow for aerodynamic effect over the rear diffuser. In the case of Renault this year it actually blows the whole floor.
FIA said that throttle body opening should be limited by the engine mapping to 10% on a trailing throttle.
Mercedes and McLaren the decided that would give them a reliability problem and asked Charlie Whiting to be able to revert to their 2009 mapping to "prevent crankcase pressurization". Dispensation granted so it looked as if Mercedes engined cars would in fact be less worse off and in fact because they then gained enough oxygen to reburn they still had some "Hotblown" effect left.
The immediate answer to this was for Renault to tell Charlie that that they had been running cold air, with no fuel injection through their V8 since 2009 for "Cooling reliability" reasons, and if the Merc dispensation was allowed they should get the 50% allowed in that mapping. Charlie was put on the spot, and having granted one dispensation for reliability reasons, had no choice but to say yes to the Renault engine users.
About the only thing you can be sure of is that they FIA shouldn't try to change the rules mid season.
Another case of trying to dumb down F1 which has backfired.
The Ferrari and Cosworth users of course are fuming.

[kevrulezz]

Well this is just making F1 look stupid,

Saturday morning in the UK it was decided that the Renault engines had to comply with the 10% off throttle, probably after a complaint from Mercedes/McLaren in my opinion, then it was announced that their would basically be no further changes to these regulations for the rest of the weekend, then all the teams had a meeting just before Qualifying and some teams made some compromises on how it would all operate from the next race onwards for the rest of the season.

Now after Qualifying the FIA have released the following statement

'The measures which were communicated to the teams this morning by the FIA Technical Department stand for the rest of the weekend.

During Saturday morning’s Extraordinary Technical Working Group meeting, the members discussed the viability of returning to the pre-Silverstone set-ups and strategies.

If the teams are in unanimous agreement, the FIA is prepared to adopt this arrangement until the end of the current season.'

... This is all looking stupid, I don't know if all 12 teams will agree to scrap them, there was talk a few races back of HRT protesting team and I don't think Williams is all that in favour of them to begin with ether. Williams is also the team that looks to have gained the most from these changes.

But ignoring those that have gained from these regulations, Will all the teams agree, to make F1 look to be somewhat sane, and yet in the process back flip on its new/current rules, making it look once again insane? or not all the teams agreeing, this continuing and F1 looking insane anyway.

This whole blown diffuser stuff is making F1 look rather pathetic no matter what happens now, if only the FIA had done one of two things, ether force all the teams to comply with the new regulations, when they are suppose to in a take no nonsense approach, or perhaps what would have been better and smarter, makes these new regulations come into effect from next season to begin with.


Anyway, whats done is done, with the way things currently are, I would vote in favour of all Engines, no matter what, have to have no more then 10% off throttle for the rest of the season, and it would have to be up to the teams to manage their engines properly, doing a back flip on this now is not possible without losing credibility, considering all the thats happened just to get to this point.

[Oldtony]

Agree 100% kev with one little addition.
If the 10% max throttle rule applies there also has to be a rule about injecting fuel to "Hot Blow" the diffusers.

[kevrulezz]

Well all the teams have failed to agree to go back to the pre-Silverstone regulations it is reported that Ferrari and Sauber were the two teams that didn't agree to scrapping the new regulations.

http://www.pitpass.com/44175-Exhaust-rule-change-scuppered-by-Ferrari

[Mothers Worry]

Formula One brings technical 'farce' to end

From AFP via Yahoo!7 Sport:

Formula One brings technical 'farce' to end

July 15, 2011

Formula One brought its technical and tetchy civil war to an end on Thursday with former champion Austrian Niki Lauda declaring the episode as the 'biggest farce ever' in the sport's history and few teams happy with the outcome.

Lauda, as outspoken now as a media commentator as he was brave as a driver, made clear that he had feared a tighter clampdown on the rules surrounding 'off-throttle blown exhaust fumes' would be seen as a move to restrict champions Red Bull's performance advantage.

In turn, any move to restrict Red Bull - following their hugely successful runaway start in the drivers and constructors championships - could be seen as a bid to help Ferrari, a scenario he told N-TV "would be the greatest insolence".

But a statement by the sport's ruling body, the International Motoring Federation (FIA) on Thursday ended the arguments which had included a public row between the McLaren and Red Bull team chiefs at Silverstone during the British Grand Prix last weekend.

There each made accusations and counter-accusations about their respective teams' use of systems designed to make use of exhaust fumes to enhance down-force, and the rear grip and performance of their cars.

"It was the biggest farce ever," said Lauda, of the Silverstone quarrels.

"The crucial thing is that absolutely no-one was protesting -- the practice was tacitly accepted by all the teams.

"But then suddenly the FIA and (race director and technical delegate) Charlie Whiting had the idea to change the rules in the middle of the season. I personally don't understand it.

"I very much hope that this absurdity stops now and that we and the crowd know at the Nurburgring (the venue for the next race) exactly what the rules are."

It was as if by magic that the complaints of Lauda, 62, and many others, were answered with the FIA statement making clear that the Silverstone episode is now history and that for the rest of this year the rules will remain those that were used at the European Grand Prix at Valencia in Spain three weeks ago.

This means the use of '?off-throttle exhaust blowing' will remain legal for the remainder of the season, but that teams will not be allowed to change their engines settings between qualifying and the race.

In the statement, the FIA said it still believed the whole practice of diverting exhaust gases in this way was 'questionable', but conceded the situation was so complicated that it was easier to revert to a known set of rules.

The statement said the FIA had acted because teams were using extreme settings for their engines for qualifying and then changing to less-extreme and more reliable ones for the races.

The FIA wanted to ban all the relevant technology this year, but came up against varied technical arguments related to safety and reliability as the teams fought over the issues and attempted to gain advantages.

In the end, said the FIA, "this was felt to be the most sensible solution to a very complicated matter as the possibility of finding an alternative solution, which would be fair to all engine manufacturers, was becoming increasingly unlikely".
In 2012, all of the teams will have to compete with cars that have exhaust pipes exiting at a higher level on the car so that the gases cannot be used to aid aerodynamic performance in the diffuser, at the rear of the car.

Yep; this whole issue has blown hot and cold.