[Gmecm] PE lean issues on a ?747 TBI

[WopOnTour]

Depends on which BLM cells I would think! (pretty good times though)
I had a 305 Spider in 1979-80 and the best I could do stock was high 15s
WopOnTour

----- Original Message ----- 
From: "Frank McCracken" <frankmccracken at shaw.ca>
To: "Per Lonnborg" <perlon at passagen.se>; <gmecm at diy-efi.org>
Sent: Wednesday, July 06, 2005 6:25 PM
Subject: Re: [Gmecm] PE lean issues on a ?747 TBI


> WOW!
> Is it common to have such good BLM readings??
>
>
> ----- Original Message -----
> From: "Per Lonnborg" <perlon at passagen.se>
> To: <gmecm at diy-efi.org>
> Sent: Wednesday, July 06, 2005 8:40 AM
> Subject: [Gmecm] PE lean issues on a ?747 TBI
>
>
>> Hi,
>>
>> I run a Monza with a stock 350TBI with the 747 ECM from a ?88 Van, the
> only
>> modifications so far is headers into a 3" single free-flowing exhaust.
>> I haven?t made any bigger mods in the chip more than lower the Main fuel
>> Tables a bit because nearly all BLM values where on the rich side.
>>
>> I have made 2 trips to the strip with this setup, the first time approx
> one
>> month ago I did a 14.64/95 run.
>> Last Sunday best ET was slower, 14.98/94 despite the fact I had switched
>> to a lower gear rear end and with POSI!
>>
>> Last Sunday the weather temperature was much higher(=lower density).
>>
>> I logged the runs with WinALDL,(I?ve attached parts of the data) and 
>> after
> analyzing
>> the values one can clearly see that the car goes lean on WOT, especially
>> last Sunday.
>>
>>
>> Now to the questions:
>> ---------------------
>>
>> 1. How does a 747 ECM compensate for air density changes in PE mode? Or
> maybe
>> it can?t?
>>
>> 2. Is there a way to see when this ECM is in PE mode?
>>
>> 3. If you look in the attached file, you can see that the battery voltage
> was
>> about 0.5V lower the slower run, can that be an issue? But I guess the
> fuel
>> pressure regualator should take care of that part...
>>
>>
>> Oh, I should also mention that the knock sensor is disconnected, the 
>> cable
> to
>> it broke, and now I can?t reach the knock sensor due to that the headers
>> are to close!
>> In other words, I guess I?m a bit on the dangerous side with this engine
>> in PE!
>>
>> Any suggestions would be appreciated.
>>
>> thanks,
>>
>> /Per
>> Stockholm, Sweden
>
>
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