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Brock's Speed down Conrod in 1979 ?

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#26 REDA9X

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Posted 31 July 2013 - 03:42 PM

Not harsh at all, true. Peter was a human being not some god like people seem to think, he made mistakes. As for harsh and being misquoted, check out his reply in AMC about the 05 VK. It has the edited version, the original had to have the several F words and other colourful language removed.

I don't think thats being misquoted or misinterpreted.

Bit harsh, especially since the guy ain't here to defend himself.

You got to remember too that ANYONE can be miss quoted or misinterpreted.

I personally have more faith in someone who was hands on over someone collecting magazines and reviewing interviews from BITD.



#27 Neils LX

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Posted 31 July 2013 - 05:58 PM

Brock never told lies. The VL Director was one top example. I also belive real 05 is at bathurst and the Peter Champion car is 25 car reshelled (have a look at damage it copped in england)



#28 Uncle Chop Chop

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Posted 31 July 2013 - 09:14 PM

You really think he told the truth about the energy polariser?



#29 _Lazarus_

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Posted 31 July 2013 - 09:20 PM

I think he probably believed he did.

 

He was a vego wasn't he... ? That takes commitment to an ideal, especially in Australia.



#30 TerrA LX

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Posted 01 August 2013 - 10:11 AM

You guys are unreal, tell me you never kept a secret (told a lie when put on the spot), done so much with your life you've forgotten trivial bits and fudged it or simply just didn't want someone to know the "truth" behind a story and given "your" account OR simply did not want to get dragged into SOMEONE ELSE'S SHIT FIGHT.

 

Never forget... never let the truth get in the way of a good story.

RIP PB.


Edited by TerrA LX, 01 August 2013 - 10:11 AM.


#31 _Lazarus_

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Posted 01 August 2013 - 12:16 PM

I don't know the full story TBH.

 

But why fit it in the first place... ?

 

What did he gain from that ?

 

 

Hippies don't buy V8 Commodores...


Edited by GTR - U9X, 01 August 2013 - 12:20 PM.


#32 _Mint_

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Posted 01 August 2013 - 05:48 PM

ok...just getting back to one of the original questions "Brock's speed down Conrod in 1979" ive watched all the video's and dvd's i have and not one mention of it

 

it would be good if there was a piece of film or something written in a book or magazine to confirm the toranas speed just for interests sake

 

the hunt continues


Edited by S.S., 01 August 2013 - 05:49 PM.


#33 N/A-PWR

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Posted 01 August 2013 - 08:27 PM

Just worked out from the first video link here:-

 

http://www.gmh-toran...79/#entry766363

 

that when P.B was talking while Racing

( he was very good at doing both )

down Conrod Straight, he stated 6500rpm in top,

( and by the sounds of the Engine he was at top speed )

So 6500rpm with 26" diametre tyres and a 3.08:1 diff = 263kph which is close to the said speed.

In my considered opinion, I believe it was a 3.08:1 Diff. Dave I

 

p.s. if anyone knows the real tyres used I can do a better calculation 


Edited by TORYPOWER, 01 August 2013 - 08:41 PM.


#34 _Lazarus_

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Posted 01 August 2013 - 08:46 PM

A 26" tyre would bring it up near 2.78.

 

I had 27" tyres with a 3.08 with 2.78 speedo gears in the gearbox and it was probably closer than factory with standard tyres and proper speedo gears.



#35 N/A-PWR

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Posted 01 August 2013 - 08:56 PM

A 26" tyre would bring it up near 2.78.

 

I had 27" tyres with a 3.08 with 2.78 speedo gears in the gearbox and it was probably closer than factory with standard tyres and proper speedo gears.

 

Sorry Mark,

But that would make it 291kph with 26" tyres at 6500rpm with 2.78 gears



#36 N/A-PWR

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Posted 01 August 2013 - 09:26 PM

Although Mark, if the tyres were only 24" in diametre with 2.78 gears at 6500rpm the speed would be 269kph,

so an Official Tyre Diametre will determine the diff ratio and speed. Dave I


Edited by TORYPOWER, 01 August 2013 - 09:29 PM.


#37 N/A-PWR

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Posted 01 August 2013 - 09:46 PM

Good Read - http://www.gmh-toran...t-this-weekend/



#38 _Mint_

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Posted 01 August 2013 - 10:02 PM

i just had a flick through my "Holden The official racing history" book..it lists the L34's top speed as 252 kph with a 2.78 diff(3.08 and 3.36 avail) no revs stated

 

rim width f-9.5in r10.0in..and no mention of the A9X's speed


Edited by S.S., 01 August 2013 - 10:03 PM.


#39 _Lazarus_

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Posted 01 August 2013 - 10:03 PM

That's what I'm saying. A standard tyre is 24". A 27' tyre takes you up one ratio. So with a 3.08 diff and 26" tyres he was closer to a 2.78 diff with standard road tyres in overall gearing.



#40 N/A-PWR

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Posted 01 August 2013 - 10:08 PM

That's what I'm saying. A standard tyre is 24". A 27' tyre takes you up one ratio. So with a 3.08 diff and 26" tyres he was closer to a 2.78 diff with standard road tyres in overall gearing.

 

Excellent,

Thank-you Tim and Mark - now do you really think Racing Tyres are Standard. Dave I


Edited by TORYPOWER, 01 August 2013 - 10:09 PM.


#41 Toranamat69

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Posted 01 August 2013 - 11:11 PM

There used to be a video with highlights of the 77 to 80 races and I was sure they mentioned the speed down conrod in that - I don't know where you would get a copy - I used to have it on VHS about 20 years ago.

Not sure what year that discussion was though, migh not have been talking about the 79 race.



#42 N/A-PWR

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Posted 01 August 2013 - 11:18 PM

Good Point - I do have "the Great Race 1960 to 2001" Bathurst VHS 6 off boxed Set, but is unopened.

 

Great%20race%20-bathurst%201960-2001.jpg in the 3rd one - 1975 to 1985


Edited by TORYPOWER, 01 August 2013 - 11:22 PM.


#43 76lxhatch

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Posted 02 August 2013 - 07:48 AM

Can't 100% make it out but at around 6:55 the commentator says either 150 or 160 "mile pers hour plus" (I think its 150 which doesn't help much)



#44 REDA9X

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Posted 02 August 2013 - 10:17 AM

I think you have just proven the point that we can't all be expected to remember details over long periods of time.

 

Thats excellent work working out the speed and tyre diametres. Whilst the L34 used the 2.78 diff at Bathurst, Holden then felt with the A9X they should homologate the 2.60 diff as they knew they would be able to achieve greater HP and ulimately expect higher top speeds. What wasn't realised though was that the A9X also allowed a larger rear tyre to be fitted, which meant increased rolling diameter. With an increased rolling diameter, you would need to adjust the gearing to achieve the same result. Now if you look at the L34's racing at Bathurst, then look at the A9X's, particularly those from 1979 on the HDT cars you see a massive difference in rolling diameter. With those bigger tyres the cars were not able to achieve the speed up the hill or out of the corners with the 2.60 diff. BoB Morris once told me they tried the 2.60 diff in practice and realised the problem and changed back to the 3.08. HDT did the same thing and swapped the diff out of the promo car into Harveys car which ultimately had diff failure. One would assume the promo car had a spare race ready diff fitted as a time saving measure as they swapped the whole unit out. I was lead to believe it was an issue with the breather on the diff that lead to the failure.

 

You guys are unreal, tell me you never kept a secret (told a lie when put on the spot), done so much with your life you've forgotten trivial bits and fudged it or simply just didn't want someone to know the "truth" behind a story and given "your" account OR simply did not want to get dragged into SOMEONE ELSE'S SHIT FIGHT.

 

Never forget... never let the truth get in the way of a good story.

RIP PB.



#45 _threeblindmice_

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Posted 02 August 2013 - 10:30 AM

Also remember , the truth will set you free !



#46 TerrA LX

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Posted 02 August 2013 - 10:35 AM

^ Or put you in jail...



#47 REDA9X

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Posted 02 August 2013 - 11:18 AM

We need a like button. Never a truer word spoken. The number of fakes floating around is bound to get someone in trouble.

^ Or put you in jail...



#48 _Lazarus_

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Posted 02 August 2013 - 11:21 AM

Excellent,

Thank-you Tim and Mark - now do you really think Racing Tyres are Standard. Dave I

 

That's not the point. I am saying there is a difference between the diff ratio and the final drive ratio when bigger tyres are used. I have had a 3.55, a 3.08, a 2.78 and now have a 3.36 in my V8 HZ. So when I think of a 3.08 ratio then I think of how it revs with standard tyres.

 

So if you say he was running a 3.08, that may be technically correct but in reality he was running closer to a road cars 2.78 final drive ratio.



#49 Redzone

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Posted 02 August 2013 - 01:15 PM

But if he's working it out considering the tyre diameter into the equation then we don't need to talk about theoretical equivalent diff ratios..

#50 RallyRed

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Posted 02 August 2013 - 02:14 PM

I think you have just proven the point that we can't all be expected to remember details over long periods of time.

 

Thats excellent work working out the speed and tyre diametres. Whilst the L34 used the 2.78 diff at Bathurst, Holden then felt with the A9X they should homologate the 2.60 diff as they knew they would be able to achieve greater HP and ulimately expect higher top speeds. What wasn't realised though was that the A9X also allowed a larger rear tyre to be fitted, which meant increased rolling diameter. With an increased rolling diameter, you would need to adjust the gearing to achieve the same result. Now if you look at the L34's racing at Bathurst, then look at the A9X's, particularly those from 1979 on the HDT cars you see a massive difference in rolling diameter. With those bigger tyres the cars were not able to achieve the speed up the hill or out of the corners with the 2.60 diff. BoB Morris once told me they tried the 2.60 diff in practice and realised the problem and changed back to the 3.08. HDT did the same thing and swapped the diff out of the promo car into Harveys car which ultimately had diff failure. One would assume the promo car had a spare race ready diff fitted as a time saving measure as they swapped the whole unit out. I was lead to believe it was an issue with the breather on the diff that lead to the failure.

 

You guys are unreal, tell me you never kept a secret (told a lie when put on the spot), done so much with your life you've forgotten trivial bits and fudged it or simply just didn't want someone to know the "truth" behind a story and given "your" account OR simply did not want to get dragged into SOMEONE ELSE'S SHIT FIGHT.

 

Never forget... never let the truth get in the way of a good story.

RIP PB.

 

Re tyre sizes as per Red's post above...

 

Not 1979, but from a road test of Garth Wigston's Roadways A9X hatch.............."front tyres were 23" rolling diameter, rears were Dunlop 418s , 12" wide, 24.2" rolling dia., ...the latest wheel arch flares will accommodate up to 25" if necessary....."

 

No date on the mag, but it has a full page ad for the new UC Hatchback with RTS on the back cover...so assuming its mid '78.






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