DBW costs

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Jul 21, 2009 | 09:46 PM

CharlieC

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From: Flower Mound, TX

DBW costs

Looking to add a DBW pedal-TB setup to my LSX-based '57 Chevy. What's the average boneyard cost for a pedal/wiring and TAC? First quote I got was $500 which sounds pretty excessive.

Thanks,
Charlie

Jul 21, 2009 | 10:22 PM

dpd069

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I paid $95 at my door for a PCM, TAC and harness from a junkyard called Carguts in Tenn. It was out of a 2003 Suburban

Try this link and look for 'electronic box' for the year and model you'd like to have-

www.car-parts.com

Sort the result by lowest price and start calling. Look for a yard that has all the components together off the same vehicle that will make you a package deal.

Good luck

Jul 21, 2009 | 11:49 PM

CharlieC

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From: Flower Mound, TX

Does the wiring harness for the pedal go... pedal to TAC to TB? I'm not using an LSx PCM and harness, so hoping the above is correct.

Thanks,
Charlie

Jul 22, 2009 | 05:20 AM

poconojoe

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Quote:

Originally Posted by CharlieC

Does the wiring harness for the pedal go... pedal to TAC to TB? I'm not using an LSx PCM and harness, so hoping the above is correct.

Thanks,
Charlie

It goes pedal to TAC to PCM. The PCM controlls the throttle body. The TAC talks to the PCM on special dual serial communications circuit

Jul 22, 2009 | 10:56 AM

dpd069

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Just a little clarification to poconojoe's note-

The engine harness has a connection to the TAC.

The TAC has its own small harness to the pedal assembly inside the car.

The TAC to pedal harness (I guess it would be better called a jumper) has a grommett on it for going through the firewall. It is about 18-24" long

Jul 22, 2009 | 12:09 PM

CharlieC

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Hmm, since I'm using BigStuff3 for my EFI controller, sounds like I'm SOL on using a DBW TB. Correct? I thought the TB was controlled by the pedal, and the TAC was just an interface between the two.

Charlie

Jul 22, 2009 | 01:40 PM

dpd069

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The throttle body is controlled off of a driver in the GM PCM, and not all PCMs have the driver circuit installed.

I don't know what a 'BigStuff3' is. Is it a standalone like a FAST or Motronic, or a variation of a GM PCM?

I would think you'd have to talk to the manufacturer to see if it was compatable with a DBW.

With the GM PCM being so tunable, supported and cheap, what made you decide to use the 'BigStuff3'? Just curious.