Mazda Rx7 FD Race Car
09-30-14, 12:58 AM
#1
FD Racer
Thread Starter
Mazda Rx7 FD Race Car
Hi All,
We are building a new car to run in the Kerrick national Sports Sedan series in Australia.
I used to run a Fiat sports sedan and then a Calibra with a v6 twin turbo but my dream had always been to run a 4 cylinder turbo car and to try and win the title against the big 6L v8's.... so here i am spending all my time and money!
A Sports sedan for you guys in the states is basically like your trans-am category. Tube frame cars with composite body shells and powerful engines. Our lap times would be a bit quicker than the gt cars in a series like the Tudor series.
Basic's
The car uses a series 6 Mazda Rx7 FD body shell. It is wider by 100mm both sides than standard. The shell including doors, roof, sills, front and rear clips etc weighs in at only 65kgs. The top of the roof at its finished sitting height is just over a metre (3 feet) off the ground.
The chassis is a tube frame chassis utilizing push rod suspension. We have designed the chassis in cad and have put it through fea analysis. The results in cad are quite good, it will be interesting to see how they compare to the real world tests we will perform. The chassis around the driver has been designed a little heavy as i wanted to make sure im safe. The engine sits as far back as we could get it. I can reach out
from my seat and place my fingers in the back of the rocker cover.
The engine we decided to use is the Honda K24. We will be turbocharging the engine and power plans are around 700 RELIABLE horsepower. The engine needs to be run hard for 25-30 mins at a time which is our race lengths so there will be no 1000bhp time attack style turbo's going on it as it would blow up quite quickly having to run those kinds of durations.
I guess you all want to know why no rotary? Well many have tried and no one has had any great success with them. If you run a triple rotor turbo in the category you have to be the same weight as the 6L nascar powered cars which is 1125kg's or 2480 pounds. if i run a 2.4L turbo 4 cylinder i only have to be 975kgs or 2150 pounds. A 13b turbo will just never make enough USEABLE power to have the drive etc in a circuit car of this speed. There are about 20 in the category over the country and all are mid field at best.
The driveline consists of a Hewland SL 6 speed sequential transaxle. It is rated for 600ft/lbs of endurance racing and allows us to quite quickly change ratio's at the track if need be.
Brakes are 375mm rotors at the front with 6 pot AP calipers, the rear is 343mm rotors with 4 pot performance friction calipers. We are using a tilton pedal set.
We are currently in the process of machining the suspension pieces and also putting the engine together.... ALOT of work ahead
Hope you like it...
https://www.facebook.com/Fdsportssedan16?fref=ts
We are building a new car to run in the Kerrick national Sports Sedan series in Australia.
I used to run a Fiat sports sedan and then a Calibra with a v6 twin turbo but my dream had always been to run a 4 cylinder turbo car and to try and win the title against the big 6L v8's.... so here i am spending all my time and money!
A Sports sedan for you guys in the states is basically like your trans-am category. Tube frame cars with composite body shells and powerful engines. Our lap times would be a bit quicker than the gt cars in a series like the Tudor series.
Basic's
The car uses a series 6 Mazda Rx7 FD body shell. It is wider by 100mm both sides than standard. The shell including doors, roof, sills, front and rear clips etc weighs in at only 65kgs. The top of the roof at its finished sitting height is just over a metre (3 feet) off the ground.
The chassis is a tube frame chassis utilizing push rod suspension. We have designed the chassis in cad and have put it through fea analysis. The results in cad are quite good, it will be interesting to see how they compare to the real world tests we will perform. The chassis around the driver has been designed a little heavy as i wanted to make sure im safe. The engine sits as far back as we could get it. I can reach out
from my seat and place my fingers in the back of the rocker cover.
The engine we decided to use is the Honda K24. We will be turbocharging the engine and power plans are around 700 RELIABLE horsepower. The engine needs to be run hard for 25-30 mins at a time which is our race lengths so there will be no 1000bhp time attack style turbo's going on it as it would blow up quite quickly having to run those kinds of durations.
I guess you all want to know why no rotary? Well many have tried and no one has had any great success with them. If you run a triple rotor turbo in the category you have to be the same weight as the 6L nascar powered cars which is 1125kg's or 2480 pounds. if i run a 2.4L turbo 4 cylinder i only have to be 975kgs or 2150 pounds. A 13b turbo will just never make enough USEABLE power to have the drive etc in a circuit car of this speed. There are about 20 in the category over the country and all are mid field at best.
The driveline consists of a Hewland SL 6 speed sequential transaxle. It is rated for 600ft/lbs of endurance racing and allows us to quite quickly change ratio's at the track if need be.
Brakes are 375mm rotors at the front with 6 pot AP calipers, the rear is 343mm rotors with 4 pot performance friction calipers. We are using a tilton pedal set.
We are currently in the process of machining the suspension pieces and also putting the engine together.... ALOT of work ahead
Hope you like it...
https://www.facebook.com/Fdsportssedan16?fref=ts
09-30-14, 06:42 AM
#3
Rotary Freak
I still think a 20B turbo is the way to go ,I was the first to do it in sports sedans and was very quick compared to the V8's with a very low tech full steel body RX7 , Your car with a 20B T would blow them away if done properly .
09-30-14, 07:18 AM
#4
FD Racer
Thread Starter
What car did you build?
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09-30-14, 10:02 AM
#8
Rotary Freak
10-29-14, 07:39 PM
#9
FD Racer
Thread Starter
So we had the chassis on display at world time attack in Australia. The guys who were running the mazda 767b came over and loved our car and wanted to buy one haha.
Crazy funny guys, he drifted the car all over the place haha.
Unfortunately i disagree WJM, quite a few have tried to do it and the most successful by far was Trent young, but yet it was never good enough. As i said before if you run a 20b turbo you have to be 1125kg's where as i can be 975kg's..... thats a huge advantage compared to 100bhp max
Crazy funny guys, he drifted the car all over the place haha.
Unfortunately i disagree WJM, quite a few have tried to do it and the most successful by far was Trent young, but yet it was never good enough. As i said before if you run a 20b turbo you have to be 1125kg's where as i can be 975kg's..... thats a huge advantage compared to 100bhp max
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