Yes i am scared by your questions!! i probably wont get any sleep tonight. Damn you!Quote:
Originally Posted by dimviii
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Yes i am scared by your questions!! i probably wont get any sleep tonight. Damn you!Quote:
Originally Posted by dimviii
so how much you pay per word?Quote:
Originally Posted by Donalduck
here everybody wants to know something he dont know or understant.If you dont bother to explain,dont waste this topic please.
I found the above a bit interesting as a mechanical engineer myself and after a bit of google search I came across this:
Dual-circuit cooling system for SSP 491 Audi 1.4l TFSI Engine With Dual Charging
(Scroll to page 31)
From what the document says it is used in 1.4l 136kW TFSI and 1.2l TFSI Engine from Audi.
thanks makinen fan!
Just a tiny point. If I'm not mistaken the 1.2 TSI engine is product of Škoda supplied to other brands of VAG.
What an interesting and informative discussion! I'll try to sum up what I found so far about the topicAll of the previously mentioned cars, namely Peugeot 207 S2000, Ford Fiesta S2000, and MINI John Cooper Works 1.6T 2000 (not sure about WRC) use electric water pumps produced by Pierburg (=KSPG), to be exact the model CWA200, which can be found in many BMWs produced since 2004 under different part numbers such as 11 51 7586925 or 11 51 7604027, depending on the motor model (M54, N52, N53, N54, N55 among others). I haven't found how sophisticated control of the pumps in rallye application is, but you can find how BMW does it here on page 75 (add the www, I can't send links yet):Quote:
...I was wondering about manufacturers switching from mechanical to electric water (coolant) pumps...
.1addicts.com/forums/attachment.php?attachmentid=586998&d=1317333814
So to me it seems like there IS a thermostat, but it's a somehow electronically controlled one plus the revolutions of the pump are controlled as well. Again, I didn't find how rallye cars do it.
Apparently there is a new model of Pierburg pumps called CWA400, which according to its name and the following plot should be about twice as powerfull: Attachment 3103. But as of now I wasn't able to find any production vehicle or motorsport car using it. Only this article mentiones several high-performance cars premiering 2013 and possibly using it (add http):
://presse-center.kspg.de/no_cache/en/press-kits/pm-single/article/sieben-top-ten-motoren-fahren-mit-kspg.html
I also wasn't able to find the relationship between Pierburg and Continental who also produce electric water pumps and call them Smart coolant pump. Sometimes I found contradictory information about which car uses which, such as here:
.conti-online.com/generator/www/com/en/continental/pressportal/themes/press_releases/3_automotive_group/powertrain/press_releases/pr_2013_01_16_best_engines_en.html
where both Pierburg and Continental claim that the new BMW 135is 3.0L uses their pump...well they are similar indeed, but can it be some sort of a cooperation? Anyway I hope this post wasn't completely uninteresting and thank you for comments.
It might be possible that BMW uses Pierburg and Continental ones for different markets. I admit I have no clue about that but I can see it as a possibility.
I want to raise a question about that dreadful understeering the Polo gets when entering corners. Where it comes from - is it a construction defect in the chassis? If yes - when they can homologate a new one? If no - which components of the transmission they can improve and which are from supplier?
understeer can create just suspension,suspension+allignment,front diff settings+suspension,or with a little help from driving style,or some combinations of themAlso you can have understeer from wrong balance between from front/rear suspension.No understeer can t be created from chassis,maybe from a wrong mounted engine(just beside the bumper like subarus) but again there are solutions to ''hide'' it,but not to reset completelyQuote:
Originally Posted by SlowSon
I think that is very hard to answer without being an insider. I'm no expert at all but in my opinion some understeering is natural for all AWD cars without central differential. If You watch closely You can see it present with all current WRC/S2000 cars (I started to notice that when first Peugeot and than Škoda found centre diff useless and stopped using it). You can play with diffs, geometry, weight balance (not much under current rules), suspension etc. but for me it remains a question what works the best with these cars. In the ideal world You prefer neutral handling but look at Loeb, he is much more understeering than most of others and he is mostly faster.