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Old 10-11-2012, 10:26 AM   #1
Vlad
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Default FIA and Group N regulations help needed

I am coming to this forum, to ask for your help with some work that I am doing, for the benefit of the EJ207 community.

Although I was oftenly checking the Sti of Japan site, recently a bunch of information was brought to our attention, under the chapter called Group N homologation.

There is a good ammount of technical information, that I want to compile, to help myself and others better understand these awesome cars.

But before I begin, I want to make sure that this information is applicable.

And here is my question:

When a company like Subaru, decides to hommologate a car for Group N, how much leeway do they have, to deviate from the stock vehicle that is sold to the masses and who's engines we swap in?

What about group A?

How much would they be allowed to tamper with and in what areas?

This would allow us to assess which of the drawings shown and dimensions presented can be taken as applicable to our engines.

Here is a link, so you can better understand:

http://www.sti.jp/e/competitor/n_hom...5676/a5676.pdf
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Old 10-11-2012, 10:38 AM   #2
Hyper
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well GrN motors is pretty much stock RA motor, that's the idea, minus different inlet hose, restrictor and retuned ECU
GrA is like open class, do whatever you want, just don't forget to put a restrictor in there

then there are occasional "factory freaks" motors that have different heads/pistons etc. made for R&D, but you don't see those often
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Old 10-11-2012, 10:51 AM   #3
Vlad
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So then the wastegate actuator is stock, right?
The ports in the head are stock too ...
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Old 10-11-2012, 11:17 AM   #4
Jard
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If you look at the tech doc you posted, it goes so far as to indicate the maximum diameter of both the intake and exhaust valves.
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Old 10-11-2012, 11:28 AM   #5
Vlad
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Yes, but it shows the radiuses of the inlet ports. These could be ported more or ported less.
If the regulations are that Subaru is not allowed to enlarge the ports, then this is the first time we have a document from the factory, that has dimensions and radiuses for the port.

I'm reading so far that when FIA took over for Group N, they made changes, but did keep the engine internals stock, require restrictor for the turbo and the flywheel has to retain diameter and weight.

Does this sound right?
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Old 10-12-2012, 09:14 AM   #6
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Quote:
Originally Posted by Vlad View Post
Yes, but it shows the radiuses of the inlet ports. These could be ported more or ported less.
No, they can't be ported more or less. The GroupN rules state very specifically what you are allowed to do, and which parts are legal to use. That's it. If it doesn't say you can do it, then you can't.
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Old 10-12-2012, 09:27 AM   #7
Vlad
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Sounds like if you're looking at engine internals and components specs of a Group N car, you're looking at a production car's specs.
This is what I was looking for, thanks.
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Old 10-12-2012, 06:36 PM   #8
Hyper
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precicely
which makes it impossible to rebuild if it goes
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