Alfa Romeo Forums banner

1 - 13 of 13 Posts

·
Registered
Joined
·
1,230 Posts
Discussion Starter #1
Morning,

it's 2018 and as i write this, options for our cars seem to be narrowing a bit. I'm wondering what's out there, available on the market right now for close ratio boxes (Synchro or dog tooth). Esp. for high powered 2.0l's where some of the current "hybrid" close ratios are at or near their limit from a torque capacity standpoint.

The giken / nissan gear sets seem to have all but dried up and are unavailable.
 

·
Registered
Joined
·
1,025 Posts
There are a couple of Euro suppliers, including Alfaholics, as well as Australian-made sets that sell on Ebay. Centerline sells a European-made example.

https://www.alfaholics.com/race-parts/105-series/transmission/alfaholics-gta-close-ratio-gear-kit-117/

https://www.ebay.com/itm/Alfa-Romeo-105-GIULIA-GTA-CLOSE-RATIO-GEAR-SET-FULL-SET-NEW-PRODUCTION/132168909264?_trkparms=aid=222007&algo=SIM.MBE&ao=2&asc=52473&meid=e8a9d3e10a814a45b65a3a01fd2654b0&pid=100005&rk=3&rkt=8&sd=142217359930&itm=132168909264&_trksid=p2047675.c100005.m1851

https://centerlinealfa.com/catalog/gta-close-ratio-gear-set

Most seem to be in the $3-5k range.

Alfaholics also sells a Quaife sequential manual adapted for Alfa use if you are willing to shell out $9k.
 

·
Registered
Joined
·
1,230 Posts
Discussion Starter #3
i think the quaife (alfaholics) set still uses the stock OD input shaft which seems to be the week link in high torque applications.

same with the GTA type sets
 

·
Registered
Joined
·
1,143 Posts
I have somewhere a link on ZF dog leg box (montreal, Fiat Dino type), modified to be plug and play in 105 chassis . Used in Italy much for hill climbs.
some ratios to choose from, italians opt for 5th 1:1 I think, that is how it is advertised. I try to find the link , is a company in France. But: very expensive...(last price I seen was around 6000,- euro, for refurbished boz incl mods for 105 chassis and adapted bellhousing)
Since it is a box used in 105 chassis (montreal ) depending on rules it may be legal.
due to the 1:1 on 5th it may need a longer diff ratio.

edit , did find him: https://www.motorsportmarkt.de/show/rennsportteile/rennsportteile/zf-s5-18-3-getriebe-alfa-romeo-giulia.html
even 6500,- euro...
But maybe possible to do it yourself.
Tried once to kontakt but no effort on that...

But : I do still drive my original box with 230 Nm on it, no problem so far (did drive a lot at Spa Francorchamps early this month, no problems ). My mecanic says the box can handle it. Problems he has seen so far with torquey engines came from bad rebuilds or servicing too late. He does service cars with AH TS engines too.
 

·
Registered
Joined
·
432 Posts
kpc655- check out TRE (Taylor Race Engineering) agents for Quaife and other 4 and 5 -speed transmissions with customer chosen ratios allegedly available for a custom build. Obviously not cheap, but stateside and seemingly willing and able to build to suit with some choice of bellhousings, bolt patterns, etc.
 

·
Registered
Joined
·
1,393 Posts
Who still has a good relation with OS Giken? How many gearboxes need to be ordered to have them make another batch?
 

·
Registered
Joined
·
2,789 Posts
Eliseo, i had a deposit with Spruell on a gearset for nearly a year. I believe he had an order for 5-6 in to Giken, but couldn’t get them to produce. I should’ve bought yours, but was short of cash at the time!
 

·
Richard Jemison
Joined
·
7,075 Posts
Shafts

i think the quaife (alfaholics) set still uses the stock OD input shaft which seems to be the week link in high torque applications.

same with the GTA type sets
No so. Even the lond small diameter input shafts on the transaxles will handle over 300 HP.
 
1 - 13 of 13 Posts
Top