I have used both. I installed the Hallman about a year ago, and ran with it until the the winter when the cold weather generated boost overshoots that caused fuel cuts. I lowered the boost quite a bit. This was with all of the possible intake and exhaust mods, AND with the boost controller connected into manifold pressure, not the hose barb on the compressor housing.

I tried the Hallman with the compressor connection, and I was satisfied with that.

I put the TurboXS HP unit in place late last fall. Same problems. And with its spring and orifice adjustments, it does present a number of variables!

I have the TurboXS connected to the compressor housing as of last weekend, and I am still dialing it in. The Hallman is faster than the TurboXS with the recommended base bleed setting of two turns open. I changed that to 1.75 turns open last night and it is much better in spool up, and is not overhsooting at 55F with 14PSI of boost. Tonite I will try for 15 15.5 PSI of boost.

But the connection at the compressor hose barb does lead to boost pressure drops at high RPM. That is why a connection to the manifold is better. But that leads to time delays that are a major source of the pressure overshoots.

I will be creating a hole in the top return channel of my intercooler and bonding a fitting to it. This should provide a good intermediate response.

I will be getting a run on a dyno this Saturday. I don't know if I will be getting things done and dialed in ny then. I hate deadlines. But a free dyno day is a free dyno day!

The $35US controllers also seem to be working very well, but I have not had a chance to try one, and will not do so unless someone is willing to loan me one. So it is $129 plus shipping or $35 delivered.

For readers with a TurboXS unit, try closing down the bleeder screw and retuning the boost. You might find the throttle response is sharper.

• hallman vs. turbo xs, sean, Thu, 19 Apr 2001 01:21:04
  • Re: hallman vs. turbo xs (long), Dean, Thu, 19 Apr 2001 09:59:05 <-- Viewing This Message
    • It should be interesting to see your dyno #'s n/m, ckpaden, Thu, 19 Apr 2001 13:08:41

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