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Light Tough 9" Options


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#1 _LXSS350_

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Posted 04 August 2011 - 02:42 AM

I am looking at opinions and feedback for all options in building a light tough 9" for an LX Hatch.

Manual gearbox with around 700 RWHP.. (sunday street and track car)

Thinking of something like these for the housing and tubes (obviously to suit Torana)

http://www.extremedr...p?page=products
http://www.pro9.com....SV=Primary&CDO=

Moser Billet Axles
http://www.mcdonaldb...illetaxles.html

Romac Floater Kit?? (not sure if I will float)
http://www.pro9.com....SV=Primary&CDO=


Strange Case
http://www.pro9.com....SV=Primary&CDO=

Truetrak Diff
http://www.eaton.com...etroitTruetrac/

330mm slotted vented disc with AP 4 piston calipers

#2 wot179

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Posted 04 August 2011 - 06:45 AM

10 points for going with a manual with lotsa neddies.

Use Mark Williams for everything.

Edited by wot179, 04 August 2011 - 06:47 AM.


#3 _rob350hatch_

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Posted 04 August 2011 - 07:59 AM

win lotto first imo

#4 _LXSS350_

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Posted 04 August 2011 - 09:39 AM

win lotto first imo

Not wrong but the diff is the cheapest and easiest part of the driveline. Buying a good A9X makes stuffing around with SL's bloody cheap.

#5 _rob350hatch_

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Posted 04 August 2011 - 09:42 AM

just out of curiosity what do you really want all that rwh for?????

#6 _LXSS350_

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Posted 04 August 2011 - 10:14 AM

just out of curiosity what do you really want all that rwh for?????

Actually its just for fun and will be as streetable as any current HSV. I needed a fun project and so have picked up an SL, certainly dont want to cut up my A9X or SS. Reality is I am single old and want to take 40 years off my body clock ..... LOL

#7 _LXSS350_

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Posted 04 August 2011 - 07:32 PM

Because its to run sundays on the street and park in shopping centres I am not a fan of spools or noisy lockers. I have regular LSD's and Trutracs that are at least quiet, but power handling and 31 spline may be borderline. It has been recommended I use 35 spline and a Wavetrac.

I have no experience with a Wavetrac, anyone know about them?

http://www.wavetrac.net/

#8 _rob350hatch_

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Posted 04 August 2011 - 08:45 PM

yeah lsd 's are the go but if your power is tractable then why not.

#9 _LXSS350_

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Posted 04 August 2011 - 09:31 PM

yeah lsd 's are the go but if your power is tractable then why not.

With such big sticky tyres and a manual its important that I keep reliability. Weight is a really big issue on this build and keeping upsprung weight to a minimum is also important for the handling goals that I want to eventually achieve on the skidpan. Its not built to be a drag racer it will be built for very fast corners.

#10 Lima31

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Posted 04 August 2011 - 10:08 PM

I have no experience with a Wavetrac, anyone know about them?


A wavetrac 31 spline on my wishlist. I read that an alternative to it is a Quaife QDH1R, but I think it is more expensive?

#11 _LXSS350_

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Posted 04 August 2011 - 10:30 PM


I have no experience with a Wavetrac, anyone know about them?


A wavetrac 31 spline on my wishlist. I read that an alternative to it is a Quaife QDH1R, but I think it is more expensive?

Thanks I will look at the Quaife as well. Everything you buy seems to be more dollars as the thirst for a better mousetrap continues. A 35 spline Wavetrac looks like getting the gig at the moment.

#12 myss427

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Posted 04 August 2011 - 10:42 PM

I have pretty much the combo your looking at, Strange alloy case, 31 spline Moser axles, Chrome Molly pinion support and tail shaft and billet yolks Cost around $5,500 if I remember correct, did it in sections. No dramas so far, and its behind a manual with the horses your after and the car weighs about 1350kgs. My mate just put a 35 spline slippery thru bolt Strange alloy diff in his 2 door HQ with Romac floaters and Commodore brakes, cost $8,500 all up, rated for 1000 horses.

#13 _LXSS350_

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Posted 05 August 2011 - 12:00 AM

I have pretty much the combo your looking at, Strange alloy case, 31 spline Moser axles, Chrome Molly pinion support and tail shaft and billet yolks Cost around $5,500 if I remember correct, did it in sections. No dramas so far, and its behind a manual with the horses your after and the car weighs about 1350kgs. My mate just put a 35 spline slippery thru bolt Strange alloy diff in his 2 door HQ with Romac floaters and Commodore brakes, cost $8,500 all up, rated for 1000 horses.

Nice, that's about the dollars. Yours looks bloody nice. Is your mates floated HQ used for drag raceing? It takes time to research the right combo. Do you run LSD,Positrac,Wavetrac or one of the lockers or spools? What rotors,calipers,handbrake setup, wheel size? Its not really the HP ...... its the torque and those sticky 13.5" tyres that kills my driveline. That's why I am thinking I am better to go to the expense of 35 spline and wavetrac than to float the axles. Your car is heavier than my aim, but it remains to be seen just how much I can shave off the old girl without it being seen as a seat, engine and 4 wheels. No luxurys or noise deadening in this one, but from the outside it will just look like a stock,neat torana except for the bloody big boots which are hard to hide. Even the under 3000rpm exhaust note will not scream hoon like some of mine have in the past. I am too old to get hassled by the fuzz, as most are younger than my own kids.

#14 wot179

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Posted 05 August 2011 - 07:45 AM

I think you would be crazy to use an alloy carrier on a street car.

They flex and wear out gears very quickly,and are advertised as such.

Perfect for a strip only car,I dont even think it would be wise to use one in a weekend club circuit car unless you are planning to replace the gearsets every couple of thousand kms.

#15 _LXSS350_

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Posted 05 August 2011 - 08:16 AM

I think you would be crazy to use an alloy carrier on a street car.

They flex and wear out gears very quickly,and are advertised as such.

Perfect for a strip only car,I dont even think it would be wise to use one in a weekend club circuit car unless you are planning to replace the gearsets every couple of thousand kms.

I have not had any issues in the past, however this is the most power/torque that I have put into one. Will talk to people about it, and I guess myss427
will give his feedback as he runs a alloy Strange. Nothing is ever perfect but sometimes priorities dictate choices, and for me that's excess weight which as Jenny Craig knows is all too hard to shed.

#16 myss427

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Posted 05 August 2011 - 11:41 AM

My mates is a street car with the 35 spline diff, but he has over 700 horses so he just wanted it bullet proof (overkill). Im running 17 inch wheels with 315 wide Nitto drag radials, very sticky. So far its a strong enough, and I think the combo is pretty light for what it is, put it in by my self. The centre is a shure grip slippery, my mate is running a 35 spline worm gear style slippery centre. My rear brakes are ford vented disks but if I did it again would go late model Commodore rears, my handbrake was a bitch to get right with the callipers on the front of the diff, had to remake brakets to get the angles and geometry right. Also about the Alloy centres being fragile, we have guys here that have drag raced there street cars for over 5 years that have had no problem so far with not replacing gear sets etc. Yes would probably go Cast steel centre with a daily driver but realy how many k's are you going to do in a year? Don't forget the supercar guys use Alloy centres and never seen one fail at bathurst, and they are NOT changing them every couple of meetings.

Edited by myss427, 05 August 2011 - 11:48 AM.


#17 wot179

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Posted 05 August 2011 - 12:03 PM

Im not implying that ally centers are weak,just that due to their abililty to flex ,the lapping patterns of the gearsets are exposed to constant variation causing the gears to wear out a lot quicker than normal.

This may be more noticable in a car set up with a spool for dragracing as opposed to a limo setup.Others may know more about this than me.

It is also a condition specifically noted in Stranges' sales literature(or used to be),I havent checked it recently.

Im not having a go,I understand your point of saving weight,we come from the same school in that regard,just commenting on something you may be unaware of.

#18 _Liam_

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Posted 05 August 2011 - 06:10 PM

Yes but a diff in V8 Supercars cost more than the engines do. Approx 50K. According to Mr. Lowndes' mechanics via some bloke I worked with.

How the hell are you going to get 700RWHP? That is extreme. What gearbox you running?

#19 _LXSS350_

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Posted 05 August 2011 - 08:10 PM

Yes but a diff in V8 Supercars cost more than the engines do. Approx 50K. According to Mr. Lowndes' mechanics via some bloke I worked with.

How the hell are you going to get 700RWHP? That is extreme. What gearbox you running?

Have a large amount of hot motors (chev,holden,dodge) to choose from in the shed. Power is from $$$,cubic inches,forced induction,good electronics and very good breathing work. Gearbox/clutch is still an enormous area of contention but a brand new highly modified T56 Magnum is currently being built in the USA for the car. However the end aim is something that I have been thinking about for a long time and that setup is far different (some say radical) than anything thats ever done on a Torana. Of course its longer term and might end up being a money pit which is why this is the viable intermediate step.

#20 _Bomber Watson_

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Posted 05 August 2011 - 08:17 PM

Just to elaborate on Craigs comments, at the end of the day the avearage gearset is good for over 400,000kms. My Landcruiser has that many kays, i recnetly pulled the rear diff and rebuilt it the gearset was still fine. So even if you halv that apparently low max km's number thats still 200,000kms with a alloy center. Hell 1/10th is still 40,000km's, a lot to rack up on a weekend only car!!!

Just my 2c.

Cheers.

#21 _LXSS350_

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Posted 05 August 2011 - 08:35 PM

For me its not a car that likely to do more than 800-1000kms a year. So even if an issue at $300 a gearset is not expensive.
Fuel economy on the other hand is dubious.

#22 wot179

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Posted 05 August 2011 - 08:43 PM

All good,mate.

Im a big fan of lightweight pseudo-legal streetcars.Absolutely love the concept.

Id drill a hole in my head to let the air out if I thought it would make me go quicker.

#23 _LXSS350_

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Posted 05 August 2011 - 08:53 PM

All good,mate.

Im a big fan of lightweight pseudo-legal streetcars.Absolutely love the concept.

Id drill a hole in my head to let the air out if I thought it would make me go quicker.

LOL

Sad to say .... but I would too.
Love speed which is why I shouldn't watch motorsports then go for a drive in anything other than a corolla.
I lost my license in my SS hatch in 1979, the exact same night after Brock won Bathurst (go figure). I was young then.(my excuse)




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