[Gmecm] TBI for 455 Olds

Sun Jan 27 18:46:28 UTC 2013

Wade...

I have a setup to reprogram the C3 ECM that you have (1227747).
All I need is for someone to either send me the 454 Chevy file you want in it, or tell me where to find it on the web or forum.

BTW, is your throttle body the large bore 454 version, and what are the size of the injectors in it, as that will need to be changed from a stock 454 calibration if different.

Hank

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From: gmecm-request <gmecm-request at diy-efi.org>
To: gmecm <gmecm at diy-efi.org>
Sent: Sun, Jan 27, 2013 1:00 pm
Subject: Gmecm Digest, Vol 16, Issue 11

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Today's Topics:

   1. Re: TBI for 455 Olds (Wade )

----------------------------------------------------------------------

Message: 1
Date: Sun, 27 Jan 2013 08:44:36 -0600
From: "Wade " <wades at mountainmanmotors.com>
Subject: Re: [Gmecm] TBI for 455 Olds
To: <gmecm at diy-efi.org>
Message-ID: <034a01cdfc9c$d462b9b0$7d282d10$@mountainmanmotors.com>
Content-Type: text/plain;	charset="us-ascii"

Thanks Joe.  I live in zip 37367.  Could we calculate shipping to that zip
please?

Also, does anyone have the setup to take my existing ECM (I have the 7747
from a Truck - 1/2 ton Chevy and 350 engine) reprogrammed to the 454 specs
or to the 455 modified specs someone else referenced?

I'd appreciate it.  My wife is really wanting to have a smoother running
engine in our Olds.

Thanks again to everyone's shared knowledge.

Wade.

-----Original Message-----
From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On Behalf
Of Joe Vitek
Sent: Friday, January 25, 2013 4:01 PM
To: gmecm at diy-efi.org
Subject: Re: [Gmecm] TBI for 455 Olds

I have two 80's Olds 7-pin distributors that I could send ya. I really only
need shipping plus a few bucks for gas. Cheap money.

Dang, this is the first time I have posted the list in like 10 years.

Then again, I am a die hard Olds guy... :)

--
joe
1988 Hurst/Olds 455ci. BBO EFI
1978 Olds Salon 350ci. SBO Olskool carb

On 1/25/2013 12:14 PM, Aaron wrote:
> First I should mention, all my experience comes from installation and 
> some light tuning on two KITS sold for the 73-78 GMC Motorhomes.
>
> Howell EFI and Turbo City.
>
> http://howellefi.com/tbi-kit-455-gmc-motorhome-1973-78.html
>
> Turbo City may be out of business.
>
> They used GM part with the GM 7747 ECU. It made finding parts on the 
> road easier than customer EFI.
>
> That Motorhome community is still very strong and active.
>
> http://www.gmcmotorhomes.com/clubs/directory.html
>
> Here is a Tech. webpage from the Eastern States GMC Club. It includes 
> two articles on TBI for the 455 in these motorhomes.
>
> http://www.gmceast.com/technical/
>
> The good news about the distributor is the size. The 455, 403, 350 and
> 307 all used the same distributor shaft dimensions. The only 
> difference that I ever noticed was the cap clocking position. Meaning 
> the HEI cap has a tab that fits into a notch on the aluminum distributor
housing.
> Some Olds had the notch on the passenger side, some on the driver side.
> The housing can be notched to make the cap "clock" to the position 
> that fits your needs. On the Motorhome, the HEI module to coil wires 
> were longer than normal to reach the other clock position. This was 
> the case in both the standard HEI and EST (Electronic Spark Timing)
distributors.
> We would buy rebuilt distributors from Napa or AutoZone or Rock Auto 
> for a mid to late '80's Olds V8 that had the 7 pin module.
>
> The bad news is the Distributor to ECU wiring harness does not come 
> with the rebuilt or new parts. We always searched the junk yards for
those.
> V6 or V8 HEI distributors with the EST system all had the same harness.
>
> Page 131 - 133 on this PDF shows the pictures of what I'm talking about.
> http://www.gmceast.com/technical/Waters_Howell_TBI_Installation.pdf
>
> As mentioned by another post, BEWARE of the Quadrajet to TBI adapter.
> One of the rear bolts in under the IAC passage AND it LEAKS !!!  A LOT 
> !!!! AND I spent way too much damn time looking for it !!!!
>
> Page 47 on this PDF shows the location.
> http://www.gmceast.com/technical/Waters_Howell_TBI_Installation.pdf
>
> As for the code, I think it started as the '89 Chevy C2500 .
>
> But I've can't research it any more now.
>
> Aaron
>
>
>
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