300rwkw/18psi,bathurst sp ht12 twins on pump98
01-04-11, 01:36 AM
#1
Full Member
Thread Starter
300rwkw/18psi,bathurst sp ht12 twins on pump98
hi guys
its taken me 1 year to complete my project , manufacturing the Bathurst sp covers
and larger sp compressor wheel onto brand new set of Hitachi twins.
back in 1995 Mazda Australia released a rx7 Bathurst sp these cars went on to win the 12hour endurance production race in 1996.
there where 38 street cars released they had the standard ht10 on them.
but the race cars had a special set of twin turbo s put together by Hitachi engineers which had larger a/r compressor covers and larger compressor wheels and the exhaust housing and turbine wheel were the same.
because of the larger a/r cover and comp wheel these allowed for more flow at higher rpm allowing the stock engine to rpm to 8000rpm instead of 7000rpm from standard comp covers.
i have had the cover manufactured to same specs as the original one with some added improvements.
and had adaptors made so they can fit to a new set of ht12 and i made factory fit high cracking presuure actuators so i could run factory boost control to 18 psi.
factory actuators cracking pressure were too low which were only good for 15 psi.
i had tested them on the same dyno back to back on the the same car with pump 98 octane fuel.
standard twins max on 15psi/7000rpm made 238rwkw(65 degrees f)
Bathurst sp ht12 on 15psi 7800rpm made 258rwkw (room temps degrees 84 f)
when i ran the Bathurst sp ht12 on 18psi they really came alive and it made
297rwkw /7800 (room temp were 92 degrees f )
its taken me 1 year to complete my project , manufacturing the Bathurst sp covers
and larger sp compressor wheel onto brand new set of Hitachi twins.
back in 1995 Mazda Australia released a rx7 Bathurst sp these cars went on to win the 12hour endurance production race in 1996.
there where 38 street cars released they had the standard ht10 on them.
but the race cars had a special set of twin turbo s put together by Hitachi engineers which had larger a/r compressor covers and larger compressor wheels and the exhaust housing and turbine wheel were the same.
because of the larger a/r cover and comp wheel these allowed for more flow at higher rpm allowing the stock engine to rpm to 8000rpm instead of 7000rpm from standard comp covers.
i have had the cover manufactured to same specs as the original one with some added improvements.
and had adaptors made so they can fit to a new set of ht12 and i made factory fit high cracking presuure actuators so i could run factory boost control to 18 psi.
factory actuators cracking pressure were too low which were only good for 15 psi.
i had tested them on the same dyno back to back on the the same car with pump 98 octane fuel.
standard twins max on 15psi/7000rpm made 238rwkw(65 degrees f)
Bathurst sp ht12 on 15psi 7800rpm made 258rwkw (room temps degrees 84 f)
when i ran the Bathurst sp ht12 on 18psi they really came alive and it made
297rwkw /7800 (room temp were 92 degrees f )
Last edited by mar3; 01-06-11 at 03:53 PM.
01-07-11, 12:20 AM
#4
Full Member
Thread Starter
hi guys
its taken me 1 year to complete my project , manufacturing the Bathurst sp covers
and larger sp compressor wheel onto brand new set of Hitachi twins.
back in 1995 Mazda Australia released a rx7 Bathurst sp these cars went on to win the 12hour endurance production race in 1996.
there where 38 street cars released they had the standard ht10 on them.
but the race cars had a special set of twin turbo s put together by Hitachi engineers which had larger a/r compressor covers and larger compressor wheels and the exhaust housing and turbine wheel were the same.
because of the larger a/r cover and comp wheel these allowed for more flow at higher rpm allowing the stock engine to rpm to 8000rpm instead of 7000rpm from standard comp covers.
i have had the cover manufactured to same specs as the original one with some added improvements.
and had adaptors made so they can fit to a new set of ht12 and i made factory fit high cracking presuure actuators so i could run factory boost control to 18 psi.
factory actuators cracking pressure were too low which were only good for 15 psi.
i had tested them on the same dyno back to back on the the same car with pump 98 octane fuel.
standard twins max on 15psi/7000rpm made 238rwkw(65 degrees f)
Bathurst sp ht12 on 15psi 7800rpm made 258rwkw (room temps degrees 84 f)
when i ran the Bathurst sp ht12 on 18psi they really came alive and it made
297rwkw /7800 (room temp were 92 degrees f )
its taken me 1 year to complete my project , manufacturing the Bathurst sp covers
and larger sp compressor wheel onto brand new set of Hitachi twins.
back in 1995 Mazda Australia released a rx7 Bathurst sp these cars went on to win the 12hour endurance production race in 1996.
there where 38 street cars released they had the standard ht10 on them.
but the race cars had a special set of twin turbo s put together by Hitachi engineers which had larger a/r compressor covers and larger compressor wheels and the exhaust housing and turbine wheel were the same.
because of the larger a/r cover and comp wheel these allowed for more flow at higher rpm allowing the stock engine to rpm to 8000rpm instead of 7000rpm from standard comp covers.
i have had the cover manufactured to same specs as the original one with some added improvements.
and had adaptors made so they can fit to a new set of ht12 and i made factory fit high cracking presuure actuators so i could run factory boost control to 18 psi.
factory actuators cracking pressure were too low which were only good for 15 psi.
i had tested them on the same dyno back to back on the the same car with pump 98 octane fuel.
standard twins max on 15psi/7000rpm made 238rwkw(65 degrees f)
Bathurst sp ht12 on 15psi 7800rpm made 258rwkw (room temps degrees 84 f)
when i ran the Bathurst sp ht12 on 18psi they really came alive and it made
297rwkw /7800 (room temp were 92 degrees f )
its comes with 2 piece carbon fibre ducting ,ast stainless steel bracket, silicon hoses and hose clamps.
01-07-11, 05:47 PM
#7
Full Member
Thread Starter
mod list of my car to achieve the 297rwkw:
apexi pfc ecu
sard 280 l fuel pump
primary injectors 550cc ,secondary injectors 850cc high flowed to 1200cc
autoexe intake
3inch exhaust turbo back.
my premium u type inter-cooler kit that i make.(limited number of sets to be sold)
special type Bathurst sp ht12 Hitachi twins that i make too.(limited number of sets to be sold)
these twins come brand new in the original Hitachi box.
pump mobile/bp 98 ron fuel ,18 psi and i tuned the car myself .
the rest of the engine/car is untouched and stock standard .
apexi pfc ecu
sard 280 l fuel pump
primary injectors 550cc ,secondary injectors 850cc high flowed to 1200cc
autoexe intake
3inch exhaust turbo back.
my premium u type inter-cooler kit that i make.(limited number of sets to be sold)
special type Bathurst sp ht12 Hitachi twins that i make too.(limited number of sets to be sold)
these twins come brand new in the original Hitachi box.
pump mobile/bp 98 ron fuel ,18 psi and i tuned the car myself .
the rest of the engine/car is untouched and stock standard .
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01-08-11, 03:08 AM
#9
Full Member
Thread Starter
05-02-12, 09:30 PM
#14
Junior Member
What did that set you back. We have a street SP that's been sitting 12y however it had a single turbo installed but I can't tell if the SP had a special suspension or shocks and as its Been sitting. For 12y you might be the expert to suggest modifications and extra checks this model might benefit from. I have see a list of recommended changes a new owner need to make immediately but do they all apply to this model
Best regards. Yvonne. WA
Best regards. Yvonne. WA
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