Competition gear and diff setup 131 Abarth (replica)
Posted: October 27th, 2009, 1:30 pm
Need guidance and advice :
I am expecting my new GC engine will be ready soon. With expected 180 + BHP. I am facing a totally new driving setup, which required adjustments to the gerabox/diff setup.
The car practically will not be used for other purpose than rallying and racing , but on rallies there are often 20 km of special (rally) stages and 300 km on regular roads between the special (rally) stage. It will not be driven just "for pleasure" ( except on very short distances )
Here is the key technical data.
CAR TYPE = 131 MODEL = Abarth (replica)
on 8 valve engine and two Weber 45's , original Abarth independent suspension and AND original Abarth differential.
ENGINE: PEAK POWER Kw = ca. 185 bhp rpm = 7200
PEAK TORQUE Nm = ca 200 Nm rpm = 5500
DIFFERENTIAL RATIO = 7/43 or 8/43
ROLLING RADIUS IN METERS =
a/ version 1 = 13 inch wheels ( Cromodora CD 66)
rolling circumference : 1.757 m
static ROLLING RADIUS: 0,261 m
dynamic ROLLING RADIUS 0, 280 m
b/ version 2 = 15 inch wheels (Cromodora CD 68)
rolling circumference : 1.757 m
static ROLLING RADIUS: 0,267 m
dynamic ROLLING RADIUS 0, 280 m
WEIGHT ON TRACTION WHEELS IN Kg. =1150
In this context I need expert advise:
Question one : should the gearbox be dog clutch or helical synchro type ?
Question two : I have a choice of going for Duo Block or Copia Frenata differential (from Colotti) or the Bacci diff type DAE03.
Anybody knows of any other choices for original Abarth differential ?
Anybody as experience with any of these ?.
Collotti offers the following :
Transmission kits:
T.247 – synchro gear 15/31 18/27 21/25 23/24 20/26 ,the 4th speed is direct
T.251 - dog clutch straight teeth with these ratios:
16/30 19/28 16/20 21/23 24/23 and the 5th speed is direct
LSD :
T.157 – Coppia Frenata differential for Fiat 131 Abarth
T. 196 – Duo Block differential for Fiat 131 Abarth
Bacci Transmissions option is reflected in the following data sheets (attached below) sheets:
Also please look at the following thread:
viewtopic.php?f=6&t=1787
Miro
I am expecting my new GC engine will be ready soon. With expected 180 + BHP. I am facing a totally new driving setup, which required adjustments to the gerabox/diff setup.
The car practically will not be used for other purpose than rallying and racing , but on rallies there are often 20 km of special (rally) stages and 300 km on regular roads between the special (rally) stage. It will not be driven just "for pleasure" ( except on very short distances )
Here is the key technical data.
CAR TYPE = 131 MODEL = Abarth (replica)
on 8 valve engine and two Weber 45's , original Abarth independent suspension and AND original Abarth differential.
ENGINE: PEAK POWER Kw = ca. 185 bhp rpm = 7200
PEAK TORQUE Nm = ca 200 Nm rpm = 5500
DIFFERENTIAL RATIO = 7/43 or 8/43
ROLLING RADIUS IN METERS =
a/ version 1 = 13 inch wheels ( Cromodora CD 66)
rolling circumference : 1.757 m
static ROLLING RADIUS: 0,261 m
dynamic ROLLING RADIUS 0, 280 m
b/ version 2 = 15 inch wheels (Cromodora CD 68)
rolling circumference : 1.757 m
static ROLLING RADIUS: 0,267 m
dynamic ROLLING RADIUS 0, 280 m
WEIGHT ON TRACTION WHEELS IN Kg. =1150
In this context I need expert advise:
Question one : should the gearbox be dog clutch or helical synchro type ?
Question two : I have a choice of going for Duo Block or Copia Frenata differential (from Colotti) or the Bacci diff type DAE03.
Anybody knows of any other choices for original Abarth differential ?
Anybody as experience with any of these ?.
Collotti offers the following :
Transmission kits:
T.247 – synchro gear 15/31 18/27 21/25 23/24 20/26 ,the 4th speed is direct
T.251 - dog clutch straight teeth with these ratios:
16/30 19/28 16/20 21/23 24/23 and the 5th speed is direct
LSD :
T.157 – Coppia Frenata differential for Fiat 131 Abarth
T. 196 – Duo Block differential for Fiat 131 Abarth
Bacci Transmissions option is reflected in the following data sheets (attached below) sheets:
Also please look at the following thread:
viewtopic.php?f=6&t=1787
Miro