Rally Cars tech stuff

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Originally Posted by OldF

What is WOT?
Alternator stops, why?

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wot=wide open throttle(butterfly at intake)
alternator =few more power due to less friction at alternator.

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Originally Posted by OldF

A car has a basic group A homlogation where the cars dimensions, weight and all those parts which must be original in group A (e.g. intake manifold, exhaust manifold etc.) are described. By a VO (Variant Option) a manufacturer homologate the parts that are allowed to be homologated in the groups A and N and modified parts in the other groups (R, S2000 & WRC). VO is also used when a modified part replaces the previous one. VK is a kit which includes all the parts homologated for use in rallying. ER (erratum) is used when there is an error in previous homologation. ER is also used when homologating modifications to the engine. Little easier to homologate only the modification and not the whole engine for every modification.


Parts that must be homologated varies in different groups. For example dampers are free in groups A and N but but must be homologated in the other groups.


Everything begins with a group A homologation. In group N there is a complementary homologation form where are all the parts that must be original in group N but didin't had to be original in group A. All the other parts allowed to be homologated in group N (brakes, clutch etc.) are homologated with a VO.


In the other groups (R, S2000 & WRC) the basic rallying parts are homologated in a VK and all the modifications with a VO or ER.


The explanations for the other ones you can find here


Homologations you can find here


R1A/B = VR1A/B, R2B/C = VR2B/C, R3C = VR3C, R3T = VR3T, R3D = VR3D, S2000 = KSR (VK-S2000 rallyes or SUPER 2000 1.6 turbo), WR = WRC parts (bigger rear wing, fly wheel etc.)


Here you can find homologation forms for different Mitsubishi evolutions. Citroen used to have the homologation forms for the C2 R2 on their web site but they're not there anymore.


Hope this help and hope I got it all right. :)

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Thank you very much for your answers!

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Originally Posted by dimviii

wot=wide open throttle(butterfly at intake)
alternator =few more power due to less friction at alternator.

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Thanks Dimviii!

ok.... thats great when its going flat out.. we have these big things called road sections on rallys and we do use interior heaters. what happens then???

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Originally Posted by dimviii

haven t see such a system,but as the ecu controls the pump speed,can t find a reason for working pump at cold engine.
except if it turns the pulley slowly just to prevent from extreme heating near cylinder head? and after a point of degrees ie 70 c turns faster?

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Ok, we use interior heaters on cold rallys.. there are long slow road sections...

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Originally Posted by bubbaontour

Ok, we use interior heaters on cold rallys.. there are long slow road sections...

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on cold rallies we use heaters also, but water temp have to raise a little bit to make it heating.
in "normal" conditions we use only blower, rarely even no blower.

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Originally Posted by br21

on cold rallies we use heaters also, but water temp have to raise a little bit to make it heating.
in "normal" conditions we use only blower, rarely even no blower.

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If you turn the pump off because the engine water is cold whats going to happen to the heater?? also how are you going to control the circulation between the rad and the heater circuit?

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Originally Posted by bubbaontour

If you turn the pump off because the engine water is cold whats going to happen to the heater?? also how are you going to control the circulation between the rad and the heater circuit?

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of course the pump is not stopped for minutes, or sth. just some seconds, so no such problems as above.

Doesnt the WRCars have electric heaters? Just wondering?

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Originally Posted by Donalduck

Doesnt the WRCars have electric heaters? Just wondering?

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WRC I don't know, but I don't think so...
S2000 have simple heater (which uses coolant fluid) plus simple blower.