| Author | Topic |
|---|
Location:
adelaide
Registered:
August 2003
|
|
info on irs and lsd set-up for purpose built hillclimb chassis
|
Fri, 12 September 2003 12:21
|
 |
Hi, I'm gathering together the parts for a space frame special using a supercharged 2t motor running 20lbs boost on methanol giving around 280 to 300 hp plus.
I need to finalize my choice of irs. On my short list is the series 4 mazda lsd at around $450 - diff & housing, which seems cheap enough, but it would be better to keep it all toyota if I can do it at a reasonable price or it is better setup. I have searched the forums...must posts were going lsd into live diffs.
Can somebody in the know, advise me what is available for my purpose ( preferably lsd high 3's low 4's :1 )...I did have a quick look at the irs in the ma70 supra ..perhaps there is a similar setup in a sedan etc that is easier/cheaper to get with lsd?
I would be looking to use the diff & housing, cv's and half shafts, uprights and disc brake setup and custom build the locating arms.
thanks, kevin
|
|
|
Location:
Lost in the K hole
Registered:
May 2002
|
|
|
Location:
Newcastle
Registered:
April 2003
|
|
Re: info on irs and lsd set-up for purpose built hillclimb chassis
|
Sat, 13 September 2003 20:16
|
|
Hi there.
What class rules allow cars to run on methanol,i thought i read in the cams manual that all cars must run on pump unleaded.
Anyway from what you have asked i think the MX83 setup would be what you need or a MS123 crown rear diff and arms,also 4.3:1 in the Crown diff.
I wouldn't go any lower than that as the clubman is powered by an 18RG with the steel case 5SP box and uses a 4.6:1 diff (not toyota) and first gear is now no longer needed to launch off the line.Dial up 4000-4500 RPM select second,pop the clucth and away you go.
Enough rambling from me,go with a MS123 Crown or MX83 Cressida i reckon.
Good luck and let us know how you get on.
|
|
|
Location:
Brisbane
Registered:
May 2002
|
|
Re: info on irs and lsd set-up for purpose built hillclimb chassis
|
Sun, 14 September 2003 00:40
|
|
I'd go with the RA65/MA61 trailing arm setup if weight is a concern; the MA70 double-wishbone IRS is superior but also VERY heavy. If you've ever had a peek under an MA70 you'll understand why!
|
|
|
Location:
Montrose, VIC
Registered:
May 2002
|
|
Re: info on irs and lsd set-up for purpose built hillclimb chassis
|
Sun, 14 September 2003 02:33
|
|
Had a look at the Nissan stuff yet? I'd say an S13 rear end could be almost what you're looking for. Plenty of LSDs available (factory+aftermarket), it's multi link, and from what I remember, if you get the subframe etc. it wouldn't be THAT hard to mount up. I daresay it'd be a bit lighter than a Crown rear end 
|
|
|
Club Member
Location:
sydney
Registered:
May 2002
|
|
Re: info on irs and lsd set-up for purpose built hillclimb chassis
|
Sun, 14 September 2003 02:41
|
|
|
If youre serious about doing it properly youre better off skipping the toyota and nissan in favour of the WRX rear end with an aftermarket ratio from Middleton Motorsport.
|
|
|
Location:
Montrose, VIC
Registered:
May 2002
|
|
Re: info on irs and lsd set-up for purpose built hillclimb chassis
|
Sun, 14 September 2003 03:18
|
|
|
Hell, if the cash is flowing, why not fabricate something from scratch
|
|
|
Location:
adelaide
Registered:
August 2003
|
|
Re: info on irs and lsd set-up for purpose built hillclimb chassis
|
Sun, 14 September 2003 08:47
|
|
Hi ..thanks for the replies...
I can use methanol in the formula Libre class in speed events ( hillclimbs ).
I plan to only use the diff, axles, uprights ( with the brakes ) and fabricate the arms, and the mounting system setup will be part of the space frame....I will not use the subframe...must save weight where possible.
The work on this car will start in the next 2 - 3 months and will be finished by March or April...hopefully, ready for next season. Will post details when it is done.
regards, kevin
|
|
|
Location:
Madrid - Spain
Registered:
August 2002
|
|
Re: info on irs and lsd set-up for purpose built hillclimb chassis
|
Mon, 15 September 2003 00:24
|
|
I'm with IRA11Y, the WRX diff is a good thing, Not too sure about reliability with that much power going through it, but they are nice and light and there is plenty of aftermarket parts for them....brakes, suspension, centers etc.
|
|
|
