This summer's project was to change my 13b 6 port Street Port over to the S5 intake from the Weber 48 IDA that I had on it. All the work was done by RPM (Rotory Performance Motorsports) in Denver.

When I first had the 13b with the Weber installed, it was a great improvement in power over the 12a. Other westerners will understand that at 5200 feet, the 12a is weak at best. With sticky tires, there was no hope for breaking the rear end loose just by engine torque alone. The car with the 13b and Weber definitely had some more low end torque but it really took off when the tach passed 6000. No more getting dropped by Camrys and Accords for sure. But I wasn't happy with the steady-state driveability of the Weber, the annoying open to closed throttle backfiring and the general grouchyness.

Enter the S5 intake. I bought all the intake parts off a junked 89, a Porsche 944 fuel pump and a Haltech F10. I had the injectors blueprinted and an A/F probe installed on the header from the front rotor. The secondary sleeves were removed and the dynamic chamber is activated by the Haltech and a Solenoid.

My most conservative evaluation of the improvement would be: HOLY CRAP! The car isn't really even tuned in yet, it's running really rich, but there is a HUGE difference in low end torque. This car can spin the rear tires from a stop at 2500 rpm. I've driven 3rd gens that don't feel as lively. It doesn't feel like it's lost anything on the high end either. The car still feels like it wants to rip the tach off over 6000 rpm where the dynamic chamber switches over. I've got the redline set at 8500 rpm but the car feels like it wants to keep going.

The Haltech is also alot of fun to play with. The software is logical and it makes the car fairly easy to tune. It's got a cool data logging feature that lets you collect engine data as you drive. Then you can bring it home and do analysis and tuning.

I'm going to do final tuning on the dyno in a few weeks, weather permitting, and I'll have power numbers to share. My guess is it'll be at least 190 rwhp peak, probably around 140-150 lb-ft of torque.

 

That's VERY cool. That's what I'm thinking about doing eventually. Those Haltechs get expensive fast though, I've heard. I've got an 84 SE, and I'm thinking about going with a Weber. Are there any differences between the 48IDA and 48DCOE that would have to do with drivability, etc.? What kind of power would a stockport 84 6-port 13B make with a 48IDA?

You looking to sell that carb? Shoot me a PM!

Zac

 

The F10 was a little over $900 from Haltech USA, which doesn't exist anymore. I've seen it go on ebay recently for $610.

I'm not sure on the power differences between the IDA and DCOE, but for some reason the IDA is typically preferred by racers.

Power? I don't know, 150-160?

The carb is sold.