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CAMS Australia and eligible parts for S30z's


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#61 260DET

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Posted 12 August 2015 - 05:18 PM

i don't see it making any more power especially if it's not built for sky high compression.


No personal experience here but using E85 is a popular choice for those who want more power. Obviously the engine has to be retuned, is there any reason why compression can't be increased on a Sc spec engine?

#62 d3c0y

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Posted 12 August 2015 - 05:20 PM


You don't see the gains with N/A cars that you do with Turbos was more my point I guess. I doubt it's worth all the messing around for the small increase you get.

#63 PZG302

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Posted 12 August 2015 - 09:22 PM

Yup biggest advantage for turboed cars, but then you have other problems like the extra 20-25% fuel you will burn compared to 98 or avgas. For sprint races not too much of an issue, except for maybe the extra bit of weight. For longer distance races like the 25 lapper at SMP, you may find the 60 litre tank of the Zed not enough.

Plus if you have an old n/a car with huge compression you would be using 120/130 avgas rather than 105 or so E85.

#64 hmd

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Posted 12 August 2015 - 09:27 PM



Plus if you have an old n/a car with huge compression you would be using 120/130 avgas rather than 105 or so E85.


Is there different grades of avgas?

#65 PZG302

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Posted 13 August 2015 - 01:11 AM

Yep, the race fuel from bp or shell commonly called avgas was rated at 110 octane and real avgas used in real planes that you bought from the local small plane airport was ratedvas a minimum of 120 and maximum of 130 octane iirc.

My old zg loved a drink of avgas, as did my sports 1300 3k corolla motor and my 2.2l L18 needed 110 at the minimum to not ping it's head off literally.

#66 Enzo

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Posted 13 August 2015 - 09:04 AM

Back in the early 80's when I was racing Avgas was sometimes hard to get so I used a mix of super fuel and Methol Benzene. Kept the engines happy. Turbo and normally aspirated.
David

#67 PZG302

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Posted 13 August 2015 - 11:33 AM

Lots of jungle juice was used in the 80's and 90's, Toluene was another favourite additive to boost octane as well.

I hate to think how dangerous and carcinogenic these homebrew fuels were, knowing how bad unleaded is when it doesn't go through a catalytic converter.

#68 dat2kman

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Posted 13 August 2015 - 08:40 PM

Motorsport is dangerous? I don't think it's fair to give zeds better brakes on that basis. Isn't the onus on the driver to drive in a safe manner and pick an appropriate car based on the rules?

I disagree strongly on that viewpoint.
Why?
The "workplace" for the driver, with its better tyre technology, along with the recently granted approval to use a 15" tyre, higher horsepower engines, drivers who are prepared to race, rather than "tour with vigour", the increased amount of safetywear to the driver, better traction surfaces being utilised at tracks, woth better track safety margins now employed,,,,
The lack of the Sporting Authourity to address a known "at their limits" issue (s30 chassis brakes), which has been raised by quite a few individual competitors, only to be dsregarded, and told " you must drive within the limits" etc etc, s clearly NOT addressing the "safety in the workplace" issue.

#69 d3c0y

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Posted 14 August 2015 - 08:54 AM


Obviously I don't have any vested interest in this as I wont be racing a zed in Sc for these very reasons. If you are looking at it in terms of the last viable way to get bigger brakes for zeds then, yeah i can understand that.

This seems like a step against what everyone already complains about in terms of Australia being a nanny state. You want a governing body (who everyone seems to say don't know what they are doing,) to take the onus away from the competitors who can decide what is safe for themselves, with a variable they have complete control over. This seems contradictory to every thing you hear about motorsport/modified cars where people want to take the onus back.


At the end of the day, it just seems like the zed doesn't fit the class as well as other cars and you have to take that for what it is (if you want to win, buy the best car for the class). If CAMs want to maintain a good variety of marques in the class, maybe it's time for them to update the rules? I mean the chances of find original dealer documentation after 40 years are pretty much nil and from what i've heard that the items that went through in recent past were probably forged anyway?

#70 260DET

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Posted 14 August 2015 - 09:03 AM

If Historic racing is to be treated seriously by the viewing public then it needs to provide actual racing which involves more than just allowing an improvement for one car on the basis of a historic anomaly eg like one dealer fitting wider wheels to cars he sold. Brakes obviously can confer a racing  advantage so any improvements should be carefully considered but perhaps allowing the use of same diameter front vented rotors to replace solids would be reasonable.

#71 dat2kman

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Posted 14 August 2015 - 09:34 AM

Same allowances as in Group N Historic Touring cars would be the go.
Same diam rotor, but vented, and maximum f a 4 piston caliper, e what the 300hp LC/LJ Toranas have had for many years in Group N.

When the dd one r two Pirsche 911's have been setup as Group N ( Wayne Seabrook) they already comply to the requirements as far as rotors, standard, but fit the allowed 4 piston calioer.
Bit f parity amongst the Historics would go a long way towards fostering more Z's into Prod Sport,,,,
We'll keep trying,,,

#72 hmd

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Posted 14 August 2015 - 12:19 PM

I have a vested interest in these deliberations as, as some of you know, I am currently building an Sc car, however there are consistent mis-directions and redirection by contributors who are not fully conversant with the governing rules and ethos of this class of racing.  This is not a criticism, just an observation. I thought it would be beneficial to all participating in this thread, and particularly those not directly involved in the category or those from overseas familiar with different regulations, to go back to some first principles.  I have taken the liberty to edit out the non-pertinent waffle and also to underline some of the salient points.  Hope this helps us with our goal of identifying eligible parts for Group Sc - S30s.

From the Confederation of Australian Motorsport Manual:

“Groups S are designed to provide a forum for competitors to race production sports cars from the ’50s and ’60s (sometimes known as “Classic Sports Cars”), in a form similar to period club racing. Limited modifications as detailed in the regulations and defined in the Specification Sheet are allowed to these vehicles. Where performance-improving modifications are made, these should be of a period nature and not out of character with the vehicle or group period. To this extent, the modifications permitted are not intended to radically alter the individual vehicle’s character or appearance and will be of an improved performance road car nature, as opposed to making the vehicle totally dedicated to outright competition”.

Pertinent extracts from the Group S Competitors’ Club web page:

“While the CAMS Manual of Motor Sport details the general compliance requirements for Group S, much regarding its history and development has been lost. As a result, many misunderstandings about Group S have developed which confuse not only new entrants but also current competitors”.

(Historically) “Production sports car racing participants were largely owner-drivers who drove their road registered sports car to the track, removed items such as windscreens, bumper bars, and anything that could be easily unbolted, and replaced the road wheels with a set of wheels fitted with treaded racing tyres. At meet’s end, road wheels were refitted, windscreens and bumpers replaced and the cars driven home”…..  “The need to keep the cars in compliance with road registration requirements and to minimise cost ensured that modifications were limited, and largely confined to engine and suspension tuning”.
“Eligible marques for Group S have been decided by the Historic Commission on the basis of production runs and production specifications. FIA homologation is not a relevant factor and plays no part in the rules for Group S – a common misunderstanding.”

“There is also no nexus between Group S and Group N – another common misunderstanding. Each category is unique and has evolved in a different way to meet the needs of differing motor sport communities”.
“A further misunderstanding is that the compliance requirements of both Group S and Group N are similar. They are not because the starting points, concepts and culture of each historic motor sport group are different. Group N racing is meant to reflect the popular Appendix J racing of the period and its rules are based on the period rules. There were no equivalent Australia wide sports car rules of the period”.


Everyone need to re-read Mike comment again regarding eligibility parts for Group S.

It doesn't matter what the factory rally teams, work teams or what some dealer fitted. It's irrelevant.

Think about this Porsche had 3.0 RS, 3.0 RSR with huge brakes and bigger wheels 15x9 and 15x10, also there are documentation from USA dealer fitting 2.8 RSR engine in run of the mill 2.7 cars. None of this apply to group S otherwise you would see Geoff Morgan and Stan Addler running RSR engine, brakes and huge wheels.









#73 260DET

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Posted 14 August 2015 - 03:05 PM

The second last paragraph of what Mike quoted is just not accurate.

Back in the day I fitted a Triumph Spitfire with a Triumph 2000 engine and gearbox and aftermarket six inch wide wheels then got it registered the usual way things were done then ie fill in a form and pay some money. There were no vehicle inspections, nothing. Six inch wheels were relatively big too, much wider than the originals.

Someone with a vivid imagination has come up with a view of how things were, that's all it is.

#74 260DET

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Posted 15 August 2015 - 01:03 PM

Pic of said Triumph

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#75 dat2kman

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Posted 16 August 2015 - 07:16 PM

Were they the ones with the interesting swing back axles?
Hit the brakes going into a corner, and rear end lifts, and wheels go to around 20 degrees positive camber?

What was the fix for that?
I know VW Beetles ( four cylinder Porshes) you could fit a "camber compensator" bar, bit like a single leaf transverse spring, that stopped them from flipping over!




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