What kind of gearing
06-17-08, 08:56 AM
#1
Rotary
Thread Starter
What kind of gearing
well first, I am going to try to build an 11sec FB, with a 85 gs rx7, not sure if I should weld the diff instead but I dont know what I am doing when it comes to diffs lol.
what gearing can I use and where do I purchase the gearings, this is all new to me.
thanks guys, I appreciate everything, and I apologise if this is a stupid question.
what gearing can I use and where do I purchase the gearings, this is all new to me.
thanks guys, I appreciate everything, and I apologise if this is a stupid question.
06-17-08, 04:57 PM
#3
Administrator
Do you have a target HP that you know is attainable? In order to select the best 1/4 mile gearing you need to work backwards.
Figure out what type of power you can make, then work the numbers backwards to figure out how to build a a setup that only requires the 1-2-3 shift instead of the dreaded 1-2-3-4 shift. That would be the start.
You might consider buying the parts from Mazda Competition Parts aka Mazdaspeed Motorsports Development or consult with a shop with a well known/successful RX-7 drag racing history such as Mazdatrix, Rotary Performance etc.
Figure out what type of power you can make, then work the numbers backwards to figure out how to build a a setup that only requires the 1-2-3 shift instead of the dreaded 1-2-3-4 shift. That would be the start.
You might consider buying the parts from Mazda Competition Parts aka Mazdaspeed Motorsports Development or consult with a shop with a well known/successful RX-7 drag racing history such as Mazdatrix, Rotary Performance etc.
06-18-08, 09:04 AM
#4
Rotary
Thread Starter
Do you have a target HP that you know is attainable? In order to select the best 1/4 mile gearing you need to work backwards.
Figure out what type of power you can make, then work the numbers backwards to figure out how to build a a setup that only requires the 1-2-3 shift instead of the dreaded 1-2-3-4 shift. That would be the start.
You might consider buying the parts from Mazda Competition Parts aka Mazdaspeed Motorsports Development or consult with a shop with a well known/successful RX-7 drag racing history such as Mazdatrix, Rotary Performance etc.
Figure out what type of power you can make, then work the numbers backwards to figure out how to build a a setup that only requires the 1-2-3 shift instead of the dreaded 1-2-3-4 shift. That would be the start.
You might consider buying the parts from Mazda Competition Parts aka Mazdaspeed Motorsports Development or consult with a shop with a well known/successful RX-7 drag racing history such as Mazdatrix, Rotary Performance etc.
06-18-08, 09:15 PM
#6
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optimal gearing depends on the hp/torque curve of the engine, and the track you're racing on.
if you wanna use a STOCK trans, they have a wide spread between gears, so the engine needs a wide power band.
www.yawpower.com has a nice calculator
if you wanna use a STOCK trans, they have a wide spread between gears, so the engine needs a wide power band.
www.yawpower.com has a nice calculator
06-25-08, 07:13 PM
#7
www.grannysspeedshop.com
ford 8.8 with many gear choices. and lighter than a 9 inch. and plenty strong enough.
gears are the least of your worries right now...12a, 13b? full bridge, half bridge, P-Port, NA, turbo, nitrous??? full interior, gutted, street legal, carb, fuel injection???
get your motor ideas in order first... gears will not push you down the track...
ford 8.8 with many gear choices. and lighter than a 9 inch. and plenty strong enough.
gears are the least of your worries right now...12a, 13b? full bridge, half bridge, P-Port, NA, turbo, nitrous??? full interior, gutted, street legal, carb, fuel injection???
get your motor ideas in order first... gears will not push you down the track...
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