The 13B NA Power Thread.

Roen · 03-11-2009, 11:12 PM

I was running about 26 BTDC on my stock port FC, made about 161 whp @ 7500 rpm. The car really started taking off north of 5500 rpm.

I think at one point in my timing curve I was at zero or negative split, forgot which.

K&N Drop-In
Rtek
Racing Beat Header, Pre-Silencer, Catback.

Took the same ECU to another FC, but with a weak compression motor. Exhaust was changed to an RB True Dual. Made 140 whp @ 6500 rpm. Power was lost most likely solely due to the motor being weak. Power just dropped off like a cliff after 6500 rpm. None of that taking off feeling was felt on this motor.

My guess for a good recipe for a high powered NA.

Cone filter getting ambient air.
Ported or Aftermarket Throttle Bodies
Intake Manifold with straight shot runners, Port-Matched, Extrude Honed, then Ceramic Coated
ECU that adjusts both fuel and timing
Making sure you have enough fuel with an aftermarket fuel pump and 4 x 720 cc's. If you have an ECU that can compensate for that much fuel at idle, no reason not to go bigger.
Large, Aggressive Streetport on a freshly rebuilt engine, with good dynamic compression. Get even crazier by re-balancing the rotating assembly and using lighter rotors to spin the engine even faster, with a matched intake manifold
Ceramic Coated Headers, with Header wrap
Expansion Chamber Collector
Pre-silencer and dual mufflers if you care about noise or straight pipe and single muffler if you don't care

As an anecdote, when I bought my latest FC, it's aux ports were frozen open. Thing was such a mule in the low end, you really had to step on it for it to go anywhere. I will never forget that feeling, since all my other FC's had working aux ports. I was like WTF????

03-11-2009, 11:12 PM	#11
Roen Evil Club Mod Join Date: Feb 2008 Posts: 183 Rep Power: 18	I was running about 26 BTDC on my stock port FC, made about 161 whp @ 7500 rpm. The car really started taking off north of 5500 rpm. I think at one point in my timing curve I was at zero or negative split, forgot which. K&N Drop-In Rtek Racing Beat Header, Pre-Silencer, Catback. Took the same ECU to another FC, but with a weak compression motor. Exhaust was changed to an RB True Dual. Made 140 whp @ 6500 rpm. Power was lost most likely solely due to the motor being weak. Power just dropped off like a cliff after 6500 rpm. None of that taking off feeling was felt on this motor. My guess for a good recipe for a high powered NA. Cone filter getting ambient air. Ported or Aftermarket Throttle Bodies Intake Manifold with straight shot runners, Port-Matched, Extrude Honed, then Ceramic Coated ECU that adjusts both fuel and timing Making sure you have enough fuel with an aftermarket fuel pump and 4 x 720 cc's. If you have an ECU that can compensate for that much fuel at idle, no reason not to go bigger. Large, Aggressive Streetport on a freshly rebuilt engine, with good dynamic compression. Get even crazier by re-balancing the rotating assembly and using lighter rotors to spin the engine even faster, with a matched intake manifold Ceramic Coated Headers, with Header wrap Expansion Chamber Collector Pre-silencer and dual mufflers if you care about noise or straight pipe and single muffler if you don't care As an anecdote, when I bought my latest FC, it's aux ports were frozen open. Thing was such a mule in the low end, you really had to step on it for it to go anywhere. I will never forget that feeling, since all my other FC's had working aux ports. I was like WTF???? Last edited by Roen; 03-11-2009 at 11:21 PM.