[Gmecm] TBI conversion

Fri Dec 1 01:18:27 UTC 2006

 -----Original Message-----
 From: dunvegan at sbcglobal.net
 To: gmecm at diy-efi.org
 Sent: Thu, 30 Nov 2006 11:59 AM
 Subject: Re: [Gmecm] TBI conversion

Painless VSS Adapter 60115 (gets 2PPM from mechanical speedo cable), car may 

have an acceptable feed already since CCC may require one

Speedo cable spins 1000 rev per mile.  Speed sensor on back of speesometer 

produces 2 pulses per cable revolution, or 2000 pulses per mile.  Output should not need buffering for 7747.

ThrottleBody from same size engine or modify cal on PROM to change inj size

PROM from same size engine (I can modify to suit)

Sensors/inputs: Knock, TPS, Temp, MAP, Spark, Speed

   I would intend to make a plate to mount fuses, relays, MAP, etc onto to make 

installation clean

   * Knock sensor exists

   * TPS should be part of the TBI

   * Coolant sensor (this is still an outstanding question, will the existing 

one suffice - I think so, if not acquire correct one)

Early CTS used a different form.  The connector looked similar to a knock sensor.  

These sensors were not terribly reliable, although if you have one it has probably 

proven itself by now.  Either the new or style will work with both carby and efi ecm.

   * MAP sensor (this is still an outstanding question, will probabally have to 

acquire correct one) My sources show a valid 90 TBI 305 P/U part # as  OEM to be 

16137939 but the parts houses show it to be 16137039, so am a little puzzled 

here.

You almost have to try to get a wrong MAP sensor.  Any of the TBI V8 vehicles will 

supply one which will work.

Zaphod

   * Vehicle has large HEI dizzy, so Painless harness should plug right up

   * VSS will be from the Painless VSS adapter or the existing speedo output to 

CCC

The last area that I'm not yet sure of is EGR and AIR (not A/C):

* I'm hoping the existing EGR controls will adapt to the new ECM w/ little or no 

changes.

* AIR, haven't spent much time under the hood yet, so I don't know what is there 

in this area if any, may not need to go here at all. We'll wait to figure this 

one out when I see if the hardware is ther now.

----- Original Message ----

From: "BNRVL at aol.com" <BNRVL at aol.com>

To: gmecm at diy-efi.org
Sent: Thursday, November 30, 2006 9:43:02 AM
Subject: [Gmecm] TBI conversion

Hello , I have a print of an  article from  January 1994 issue of Street 
Rod , written by Doc Frohmader who  outlines some details for  a Low Budget 
Injection system for Mike Moeller's 1939 Chevy Sedan .

The parts are from a 1988-92 Chevy Truck , salvage yard variety . I want to 
follw this recepie for my 1933 Dodge Pickem-up Truck .It has a 1969 Corvette 
350 CI engine ,Sig Erson can, numbers unknown but a nice  smooth 800-1000 rpm 
idle , factory alum intake ,  Carter 4 Bbl. carb. 350 automatic trans.. and at 
3500 rpm it will jump one lane when opened up to 4200 rpm , so I do not need 
any more speed for a daily driver , just improved gas mileage which now is 15 
mpg highway .

Ihave not been able to locate an email for Mr. Frohmader nor Mr. Moeller , 
so a follow up for current info on the project is not possible as of today .

  Can any one help me  ?, in  that I am ready  to begin  a parts list and 
begin to accumilate  pieces for this endeavor  now. 

Thank you

Bob Norville
  Memphis,Tn. area
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