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- Joined: February 11th, 2010, 10:30 pm
The long-term plan is to eventually create a full Prototipo replica but I am short on some specific details of the original still born Group4 Fiat.
I would be grateful if any forum members could fill in the blanks in my knowledge. I have two main queries regarding the original specification: -
What uprights and hubs were used? Given that only the 1300cc X1/9 was in production at the time of the Prototipo development, Fiat was unlikely to have utilized standard items.
I believe the brake set up (at least on the front) came straight from the Group 4 124 CSA Abarth. What specification would this have been? i.e. disc diameter/thickness, caliper manufacture, piston number/diameter etc.
If anyone has undertaken a similar project and would like to share any relevant information this would also be most welcome. I am also seeking particularly guidance on:
Transmission - Fiat used the Group 4 Beta gearbox, the homologated ratios of which had a very effective spread, but given that these are likely to be more rare than the proverbial hens teeth, a Montecarlo box is probably the only choice. Is anyone using a monte box? What is your experience with gear and final drive ratios?
Many thanks in advance for you response.
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- Joined: February 14th, 2007, 4:27 pm
- Location: UK
You may also need to think about your budget if you want to use original spec parts.
Hub carriers - all special steel forgings - basically no chance to find. Not sure what you might be allowed to use instead - At rear 131 abarth Group 4 might be made to fit but they would set you back about Eur750 per corner for hub carrier alone!
Struts and dampers - again all special (Struts with adjustable spring pans - Fixed valve Corte & Cosso Inserts) - You may be able to get away making up some struts with period spec koni (i.e oil filled inserts, not Bilstein gas, and with inserts non adjustable)
Front brakes - same bells as Group 4 124 - 256mm by 20mm vented, but with very deep bells - were unavailable for many years but a small volume has been made recently in Italy - I think they are Eur500 a pair - contact Dirk Marcel at Ricambi Bielstein
Front calipers are two pot alloy - Forged calipers same as RS porsche - you can still find them if you are lucky - try Frances Tuthill
Rear brakes again same as Group 4 124 - 256mm by 10mm non vented but with provision for handbrake in the bell - I had some remade in Uk, and can put you in contact with supplier
Rear brake calaipers - steel ATE - same as period Alfa - Tony at MBG can get them
Rear handbrake parts - Special Abarth - used on late G4 124 and also on early G4 131 - will be hard to find (but they are spectacularly useless anyway)
Gearbox - proper straight cut close ratio internals for Monte Carlo box are still available from Paulo Colotti in Italy.
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I think there may be some of these in the 'for sale' section, from member Miroslaw Miernik in Poland.
Thanks for your very informative post Mick,
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