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 Post subject: Re: Clutch Coupler?
PostPosted: Thu Aug 06, 2020 10:27 am 
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Joined: Tue Dec 31, 2013 10:40 am
Posts: 468
Location: Huntsville, AL
Why do you have the 1in spacer between the block and trans? You changing the angle of the trans? Why not space the clutch pack/etc further out towards the input shaft?

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Brett W
Huntsville, AL


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 Post subject: Re: Clutch Coupler?
PostPosted: Thu Aug 06, 2020 10:33 am 
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Joined: Tue Aug 20, 2002 10:01 am
Posts: 2663
Location: Belmont, CA
I think that was done to allow clearance for the hydraulic throw-out bearing assembly, which doesn't exist on the stock VW clutch / tranny setup.

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Tim Linerud
#95 GTL VW Rabbit GTI
2014 Runoffs Sunoco Hard Charger - GTL
2016 Western Conference GTL Champion


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 Post subject: Re: Clutch Coupler?
PostPosted: Thu Aug 06, 2020 11:43 am 
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Joined: Fri Dec 23, 2011 6:59 am
Posts: 1389
Location: Spring Hill, FL.
Pretty car.
Also not sure why the spacer. There should be room to mill the trans face to fit the tO bearing.

Normally . The flywheel is custom and the disc surface is raised to coincide with the trans shaft.

I looked a t ways to do this also. I found very little weight savings over a small OE style setup adjusted with preload and careful lathe work. On top of that,the Tilton disc is solid center only and will break the 5th gear over about 160HP. The stock style sprung center disc seems to reduce the 5 th gear issues. May work fine with a 4 spd. I see a 5 speed fitted.

I dont see any thing good with the extension. Big vibes, broken input bearings.
I would start over . IMHO.

FWIW the axles needing to be custom length. Read the rule. Measure max track, find the OE axle that places the wheels where you need them. Make control arms . There are at least 3 options for axle lenght . Mk1, Mk2 Mk3 , all gain about 1 in.

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Mike Ogren/Protech Racing, http://www.FWDracingguide.com http://www.ogren-engineering.com/ 352.428-8983 mogren@tampabay.rr.com


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 Post subject: Re: Clutch Coupler?
PostPosted: Thu Aug 06, 2020 12:39 pm 
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Joined: Tue Mar 23, 2010 9:56 am
Posts: 116
Thanks again for some useful comments...

The spacer (between engine and trans case) is indeed a bit of a question mark, but trying to see if I can make it work, otherwise as Mike eluded to, there is a long list (longer than Mike's) of things that will need to be bought, replaced and/or modified. May need some careful balancing of parts....

Mike, I'm unaware of the 5th gear issues in this trans that you refer to when HP over 160. ....especially with the Tilton solid center disk. Is this a common issue for 5-speed VWs?

Neil


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 Post subject: Re: Clutch Coupler?
PostPosted: Thu Aug 06, 2020 1:03 pm 
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Joined: Fri Dec 23, 2011 6:59 am
Posts: 1389
Location: Spring Hill, FL.
Yes, for stock 5 th gears, esp the .89.

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Mike Ogren/Protech Racing, http://www.FWDracingguide.com http://www.ogren-engineering.com/ 352.428-8983 mogren@tampabay.rr.com


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 Post subject: Re: Clutch Coupler?
PostPosted: Thu Aug 06, 2020 1:58 pm 
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Joined: Tue Mar 23, 2010 9:56 am
Posts: 116
just to complete the conversation... I believe (according to notes that came with the car) I have a close ratio gear set with 4th and 5th gear from HOER

1st 2:50
2nd 1:79
3rd 1:42
4th 1:14
5th 1:03
with a 4.20 or 4.25 Quaife limited slip

Hopefully these are a little stronger...

Neil


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 Post subject: Re: Clutch Coupler?
PostPosted: Thu Aug 06, 2020 4:22 pm 
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Joined: Tue Aug 20, 2002 10:01 am
Posts: 2663
Location: Belmont, CA
Mike, this is a GTL car. Track is 60" front and rear

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Tim Linerud
#95 GTL VW Rabbit GTI
2014 Runoffs Sunoco Hard Charger - GTL
2016 Western Conference GTL Champion


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 Post subject: Re: Clutch Coupler?
PostPosted: Thu Aug 06, 2020 6:14 pm 
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Joined: Fri Dec 23, 2011 6:59 am
Posts: 1389
Location: Spring Hill, FL.
The gear set sounds like the VW motorsports Ralley set. 100MPH ish.
If the car spins to 9000 RPM the gears may work . My customers that use the 425 final do so to utilize SM 15 in tires. I dont think it can work withe 20.5 tires. I use either the 3.94 or the tall set of 3.67. @ 7000.
The speed chart is here; http://www.scirocco.org/gears/
If the mission for this car is GTL, the SIR shuts them off about 6200.
If it was mine, I would sell this trans and find the proper gear set . The trans should be worth about 1200$ MOL
Yes the 103 5th gear is stronger .

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Mike Ogren/Protech Racing, http://www.FWDracingguide.com http://www.ogren-engineering.com/ 352.428-8983 mogren@tampabay.rr.com


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 Post subject: Re: Clutch Coupler?
PostPosted: Thu Aug 06, 2020 7:55 pm 
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Joined: Tue Mar 23, 2010 9:56 am
Posts: 116
Mike,

Again, thanks for the info and link...I'll look further into the gears (and spares) and confirm what I got...

Neil


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 Post subject: Re: Clutch Coupler?
PostPosted: Fri Aug 07, 2020 4:55 am 
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Joined: Wed Oct 28, 2009 9:24 am
Posts: 931
My take re the clutch fwiw is to go back to a stock(ish) arrangement on the clutch. It works.

Your setup can most likely be made to work but will involve considerable expense and likely a few failures along the way. Save that project until you have everything else maxed out and working smoothly.

Re gearing - definitely do the math speed vs RPM vs ratios vs tire circumference. This is one area where simple math will get you really close.

Re 5th - What displacement is the engine? It's torque not power that breaks transmissions, at least mostly. I think that the stock 5th can be fairly reliable if it is a nice firm press fit and the engine isn't too big. And you shift gently into 5th! (I'll doom myself by typing this)


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