Julian B
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 posted on 22/3/07 at 06:44 AM |
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gearboxes
Hi All
Before i built my 7 clone that i have just finnished i was going to build a v8 powered mid engine "somthing". I keep coming back to the
lovely GD Lola T70 replica , but its way out of my price bracket.
So i have decided to do the whole thing myself this time.
My starting point before i get to chassis design will be the power plant . I am going with the trusted Rv8 but i intend to turbocharge it taking the
power output upto about 350bhp
My question is this where do i obtain info on suitable gearboxes. I know that i can purchase a race spec hewland box and i know the the renault UN1
can be used but i dont think the renault will take the power. Does this only leave porche and audi? If so where do i get them from?
Many thanks
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Fred W B
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| posted on 22/3/07 at 08:05 AM |
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Best place on the net I've found for transaxle info is an America site called
www.gt40s.com
Wade through the "engine and transaxle" section. .
The "web wisdom" I have seen says the usual Audi 016 is a bit suspect once you get up to +/- 350, but I can't really be more
specific than that.
See some discussion HERE
Cheers
Fred W B
[Edited on 22/3/07 by Fred W B]
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cymtriks
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| posted on 22/3/07 at 08:41 AM |
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Audi or Porsche
The UN1 is fine if you can find one!
At the power level you are aiming at the Audi will be at it's limit.
The Rover V8 is not light weight by todays standards, it's actually only very slightly less weight than the much more powerful, and more
tuneable LS1. LS1 to Porsche is a fairly well known combination so it be easier to start here.
There's also the Lexus V8 engine which is very tunable.
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v8kid
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| posted on 22/3/07 at 01:03 PM |
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its quite tricky to mate the rv8 to the uni. you need an 18mm adaptor plate to bolt the bellhousing to the block. this makes the box input shaft short
so you have to extend the input shaft spiggot to support it. the uni bellhousing is too small for the rover flywheel so you need a smaller dia fly
which is no bad thing cos its too heavy for a sports car anyhow. you now needan offset starter to line up with the new fly. as if that aint enough
even using ap nested plates in a twin plate clutch the splines dont fully engage anf you need to machine 5mm off the bellhousing. there aint much room
for release hydraulics even with the most compact one you have to grind the max off the back.
then theres the gearchange.
handles power no prob hewland costs 15k plus so no competition.
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v8kid
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| posted on 22/3/07 at 01:03 PM |
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its quite tricky to mate the rv8 to the uni. you need an 18mm adaptor plate to bolt the bellhousing to the block. this makes the box input shaft short
so you have to extend the input shaft spiggot to support it. the uni bellhousing is too small for the rover flywheel so you need a smaller dia fly
which is no bad thing cos its too heavy for a sports car anyhow. you now needan offset starter to line up with the new fly. as if that aint enough
even using ap nested plates in a twin plate clutch the splines dont fully engage anf you need to machine 5mm off the bellhousing. there aint much room
for release hydraulics even with the most compact one you have to grind the max off the back.
then theres the gearchange.
handles power no prob hewland costs 15k plus so no competition.
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gttman
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| posted on 22/3/07 at 06:10 PM |
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buy an Audi V8 with a manual box.... if you get a later engine it will have over 300bhp as std and then get a modern A6 tdi fwd box (handles
4-500bhp).... whole lot bolts together for a lot less than almost any other solution with that kind of power..
Its also much lighter and very short, although its a wide engine.
Andygtt
Please redefine your limits
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goodall
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| posted on 22/3/07 at 07:04 PM |
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i have the workshop manual for the audi 100/200 and it says that all uk models with a 5 pot engine have the 016 gearbox but the book i have for the
audi 80/90/coupe says that it was never fitted with the 016 so if you want the 016 box find an audi 100 with the 5 in it, i have one already but its
not for sale
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Julian B
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| posted on 22/3/07 at 07:12 PM |
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Thanks for all the info
Can i just ask what the Lotus Esprit used to us. Wasn't that a RV8?
I would do as you said about the Audi V8 but the idea is to spend a moderate amount over a fairly long build period. Rover v8 engine parts are still
dirt cheap and readilly available I know how extortionate Audi prices are having owned a few.
The Audi 100 gearbox however looks interesting but is this as difficult to get hold of as the UN1?
Cheers again , its all very interesting stuff
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goodall
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| posted on 22/3/07 at 07:17 PM |
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i'd say the audi box will be a very simple to find, you can buy old audi 100's for next to nothing. its the same box as that used in the
924 and 944 if i remember right
the esprit used a un1 and one the things that stop its production was the end in supply of the un1 gearbox
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locost_bryan
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| posted on 23/3/07 at 04:30 AM |
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The Lotus Esprit used the Lotus 907 2.2l slant-4 for most of it's life. Then Lotus joined 2 together to make their own V8 - that went in the
later cars.
Bryan Miller
Auckland NZ
Bruce McLaren - "Where's my F1 car?"
John Cooper - "In that rack of tubes, son"
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gttman
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| posted on 24/3/07 at 09:05 AM |
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380bhp with box for £1k....
http://cgi.ebay.co.uk/Audi-RS4-engine-gear-box-gearbox-2-7liter-bi-turbo_W0QQitemZ280096874883QQcategoryZ9888QQrdZ1QQcmdZViewItem
You'd need to check this is the right Audi box that can handle the kind of power (you need the deisel one I beleive)...
http://cgi.ebay.co.uk/audi-a4-6-speed-manual-gearbox_W0QQitemZ160098190805QQcategoryZ10372QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
[Edited on 24/3/07 by gttman]
Andygtt
Please redefine your limits
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Julian B
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| posted on 24/3/07 at 07:26 PM |
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Hi Andy
Yes i am watching the 01X box on ebay but i dont know if its any good, as its not what i understand to be the prefered 01E box. I'll keep an eye
on it though and maybe take a chance
Cheers again
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goodall
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| posted on 24/3/07 at 09:03 PM |
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thats a quattro box and engine that ebay link
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gttman
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| posted on 25/3/07 at 08:47 AM |
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yep its a 4wd box with the engine.... thats why I put that other box up, as you can sell the 4wd box that comes with the engine and buy this 2wd unit
to use which should just bolt up.
Andygtt
Please redefine your limits
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