DRAC for 730 to 749 conversion

[Bruce]

Since you can flip a 730 to read the tranny reluctor,  or optical, I just
would guess that you can do the same thing with a 749.
If you visit www.syty.org, and look around at the code stuff I'd bet the
answer is there.

CAC, syclone uses a air to water Intercooler, this is the fan control for
the I/C fan

Bruce



----- Original Message -----
From: "Dan Plaskett" <dynastydaniel at home.com>
To: <gmecm at diy-efi.org>
Sent: Monday, September 03, 2001 11:54 AM
Subject: DRAC for 730 to 749 conversion


> In changing from 730 ECM running 1991 Corvette AXCN code to 749 ECM
running
> SyTy code I've run into a couple of questions.
>
> First, in the Corvette code there are two VSS inputs high and low that run
> from the VSS sensor mounted on the transmission.  The Pinout diagram for
the
> SyTy does not use VSS inputs but instead uses a DRAC signal on pin C6.
> After searching and reading the archives my conclusion is that I need to
> obtain the DRAC to get the vehicle speed information into the ECM.  I am
> running a mechanical speedo so I am not really concerned about the VSS
> outputs that normally drive the speedo but it seems that I still need the
> DRAC.  Without it the engine would have the problems associated with
running
> no VSS, potential for stalling, incorrect idle speed when moving, etc.  Is
> my analysis correct?
> Second, pin E8 in the SyTy code is labled CAC control.  Is this a cooling
> fan control?  I can't seem to find anything else on the SyTy that looks
like
> the cooling fan relays on pin E8 and D12 of the Corvette code.
> TIA
> Dan Plaskett
> 61 Corvette TPI w dual Paxton superchargers


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