STM Phasar 750
Posted: December 26th, 2006, 4:34 pm
Hi All,
I've now given up on my old racecar (viewtopic.php?t=357) as the chassis is far too old and... well bendy! After some post season analysis, I¢ž¢ve found that the suspension pickup points have more movement than the shocks and the chassis is also showing some rather alarming signs of stress.
My first thought was to build a car from scratch, but in all honesty I'm no chassis designer and would probably end up with a white elephant!
So, after much research, I've just put a deposit down on a Stuart Taylor Motorsport Phasar package. The reason I went for the STM is first and foremost because it's the only car of this type that uses a laser cut chassis, the torsional strength is apparent from it's (and it's sister's 'The Pheonix') success in the 750MC RGB series.
Other lesson's learned from the previous car are...
1. Use a proper gearbox. The old Reliant unit although very light just couldn't cope with the torque of the Fiat engine. A Ford Rocket gearbox with Quaife main case and TranX gear set is going in the new car. More info here http://www.racingaspirations.com/galler ... ketgearbox.
2. Use components that are still available! A lot of the components were BMC based and very hard to source nowadays. The new car will be using Ford (based) front uprights, rear axle, prop shaft, steering rack etc.
3. Less weight = more speed! Because the old car was an evolution of an evolution, parts kept being added, without (too much) thought for the consequences. Not so with this car - use the shortest route for oil/water hoses, no panelling that will then be covered by another panel, don't use so many fibreglass layers for bodywork.
4. Make components as accessible as possible.
On a good note though, the ground-effects worked a treat, the high speed stability was awesome. I'll definitely be refining this area on the new car.
I've attached some pictures of the standard car, but, expect the finished product to sit a little lower with some (maybe) different cooling architecture + a rear wing of course.
I'll keep updating as the build progresses.
Thanks for looking,
Huw
I've now given up on my old racecar (viewtopic.php?t=357) as the chassis is far too old and... well bendy! After some post season analysis, I¢ž¢ve found that the suspension pickup points have more movement than the shocks and the chassis is also showing some rather alarming signs of stress.
My first thought was to build a car from scratch, but in all honesty I'm no chassis designer and would probably end up with a white elephant!
So, after much research, I've just put a deposit down on a Stuart Taylor Motorsport Phasar package. The reason I went for the STM is first and foremost because it's the only car of this type that uses a laser cut chassis, the torsional strength is apparent from it's (and it's sister's 'The Pheonix') success in the 750MC RGB series.
Other lesson's learned from the previous car are...
1. Use a proper gearbox. The old Reliant unit although very light just couldn't cope with the torque of the Fiat engine. A Ford Rocket gearbox with Quaife main case and TranX gear set is going in the new car. More info here http://www.racingaspirations.com/galler ... ketgearbox.
2. Use components that are still available! A lot of the components were BMC based and very hard to source nowadays. The new car will be using Ford (based) front uprights, rear axle, prop shaft, steering rack etc.
3. Less weight = more speed! Because the old car was an evolution of an evolution, parts kept being added, without (too much) thought for the consequences. Not so with this car - use the shortest route for oil/water hoses, no panelling that will then be covered by another panel, don't use so many fibreglass layers for bodywork.
4. Make components as accessible as possible.
On a good note though, the ground-effects worked a treat, the high speed stability was awesome. I'll definitely be refining this area on the new car.
I've attached some pictures of the standard car, but, expect the finished product to sit a little lower with some (maybe) different cooling architecture + a rear wing of course.
I'll keep updating as the build progresses.
Thanks for looking,
Huw