J N's MiniRam backfire

[timsiford at hushmail.com]

Walt,

There is a full Excel spreadsheet with much more data in it.  If interested 
let me know.  Somehow I ended up with a copy ;-)

Tim

At Thu, 9 Nov 2000 19:15:29 -0800, "Walter Sherwin" <wsherwin at home.com> 
wrote:

>
>Backfire when exactly.  During throttle opening or closing maneuver? 
> The
>short burst of data below is a bit inconclusive.
>
>Walt.
>
>
>
>> Jason sent me an XLS spreadsheet with data from a scantool that shows 
>a
>> backfire happening when he blips the throttle.  Car = 1987 Vette w/
>MiniRam.
>>  Its pretty interesting.  (Jason, I am posting here because I can't 
>find
>> your e-mail, thirdgen appears to be down, and I also want to share 
>this
>> info with others here).
>>
>> The data clearly shows Jason 'blipping' the throttle from off idle. 
> There
>> are 4 data points on the throttle blip and you can clearly see the 
>O2
>volts
>> going from the switching behavior at idle (TPS=0.53V) to 0mV on a 
>Throttle
>> blip.  The data is below.  This appears to be a fueling issue (expecially
>> when viewing the SA in relation to the throttle blip and LV8).  Its
>undetermined
>> as to whether or not it is a PROM fueling issue or a mechanical fueling
>> issue.  What do you guys think?
>>
>> RPMs,TPS, O2, AFR, Knock, SA, LV8
>> 875, 0.530, 836, 14.7, 0, 25.4, 57
>> 875, 1.630, 712, 11.7, 0,13.8, 189
>> 875, 3.310, 292, 11.7, 0,15.9, 177
>> 1300, 2.94, 0, 11.8, 0, 28.2, 175
>> 1725, 0.90, 13 ,14.7, 0, 45.5, 124
>>
>> Jason - quick question for you.  The MiniRam has ZERO provisions for 
>EGR.
>>  What PROM are you running?  Are you running $6E code, $32B code? 
> Is your
>> PROM image based off an original TPIS image or did you start with 
>the
>stock
>> image as a base?
>>
>> A separate issue is that IMHO, knock -should- be detected and isn't.
>>
>> Tim
>
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