scan tools and WOT

[Bruce Plecan]

-----Original Message-----
From: Terry <thartman at gte.net>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Wednesday, October 14, 1998 9:47 AM
Subject: Re: scan tools and WOT

No mode select for recording?.  Or what was it set at?.
Generally ET, is about the overall combination, and MPH, is about HP.
Kinda like running a 13.5 at 106 mph.  Basically ya got a 12 sec ride on
13 second tires, or some other malidy...
Pardon my ignorance on the record ain't been there yet.
Bruce


>Andrew F. Gunnesch wrote:
>> That's interesting...  my TPI car, when the Diacom puts it into ALDL mode
>> (I haven't been able to get it to link in diagnostic mode) everything
works
>> just fine.  I can watch the timing being varied too.  It drives normally.
>> Maybe that's because this is a TPI ECM?
>I made an interesting observation while at the track this past Saturday.
>I made 4-5 runs with Diacom recording data.  Then I made 5-6 runs with
>the Diacom disconnected.  Guess what?  I was both quicker and faster
>by .1-.15sec and 1mph with the Diacom disconnected....
>Wonder why????  This is on any '87 TPI/MAF motor.  Is the ECM that slow
>that it can't optimally control the motor at WOT while transmitting
>data?
>thanks,
>T.