Out of curiosity what would be the best carberator/manifold for a S4 13B for maximizing low end torque while still having something up top.

 

I meant, Carb + manifold. Off the shelf products.

 

Don't know what set-up but look for something that has long runners and seperate runners for the primary and later opening secondary ports to keep the intake velocity high at low rpm's. Joining both runners together (like some manifolds do) will slow the intake velocity at low rpm's. This causes less fuel/air mixture to be drawn into the engine at lower speeds. Less fuel/air means less kabang meaning less power down low. Get it?

 

 

Off the shelf a RB holley 600.
It's the only choice besides two barrels and will make good low end.

Got one on my SE and it's quite torquey down low (for a rotary)

 

Thanks alot!

 

Racing Beat Modified 48 DHLA Carburetor. You can find them for sale periodically on the various forums, including this one. The carbs came with 39mm chokes/venturis, but you may want to go a little smaller, say 37mm, for better low end without sacrificing too much top end.

 

www.gruntled.com is a great web site for information on the Racing Beat Dellorto.