Im thinking of getting an SA dirt stock, and thinking of spending no more than $1,500. What would be the best bang for the buck performance wise and what power figure am i looking at.
Just a rough idea would be great guys.

 

Welcome to the forum. This subject has been covered and covered and covered.
Are you saying that you are going to spend $1.500.00 for your mods?

 

He's also in Australia, so the blokes over there would be better able to give him a real answer...

 

When I was over there I did not see 1 Rx7. That's because it was back in 1980,lol. Alot of Holdens.....

 

For 1500, you'd be close to getting a full exhaust and aftermarket carb/intake. Not sure of pricing for parts down under. If done and tuned right, near 140 hp tops.

 

At the flywheel or the rear wheels?

 

At the flywheel.
A 44phh Mikuni with a good header/exhaust system will dyno at approx 146BHP.
A weber will probably get you another 4-6 depending on jetting.

 

with an after market carby and exhaust, id be at the wheels.

 

it would be 140* at the wheels. depending on the carb

 

Redo your math there amigo. You are 100% wrong on your at the wheels statement.

 

140 rwhp would be about 165 HP at the flywheel...impressive...my RP big street port with the bone-stock, unported Nikki was at an est 135 HP at the flywheel with the above mentioned exhaust AND a working air pump...IOW, it also passed emissions legally.