[Diy_efi] Projects

[Clair Davis]

David,
Thanks, it feels like I've been on the steepest part of the learning curve
for the duration of this project.  It doesn't help that "real" life keeps
getting in the way, but at least nothing is spoiling while it waits in the
garage for some more attention.  I don't have any video, but I might have
some data logging files - tied  up on my near-dead laptop.  I don't know how
useful they would be.

The feel of the problem is like an abrupt loss of fuel - the car bucks and
acts like a stall, and because it's a 4-speed car the feel is pretty severe.
AF ratios are also going very lean when this happens.

I'm in the process of removing any "extra" bits in the fuel system - I have
a small surge tank that may be contributing, but I don't need that piece
until I get in to a high-G + low fuel situation.

I'm also going through the code and trying to switch off everything that
doesn't look absolutely necessary to run the engine.  This is where my
unfamiliarity with the code and the sophistication of the GM tuning effort
are making things difficult.  They really did a great job and this novice is
a little overwhelmed...

I'll see if I can dig my EFI files from the old laptop and get things
running on this new machine so I can talk more intelligently now that the
list is humming along again.

Clair


-----Original Message-----
From: David Allen [mailto:davida1 at hiwaay.net] 
Sent: Thursday, October 18, 2012 12:32 PM
To: diy_efi at diy-efi.org; clair.davis at charter.net
Subject: Re: [Diy_efi] Projects

Your engine setup looks very good. Nice 4-BBL throttle body setup.
I've found out, as you, that part throttle is the worst part of it. Multiple
ECU's and different engines and the part-throttle is always the pain to
tune!

As for the part-throttle drivability, what is it doing? Do you have any
videos of the drivability problem?

Sincerely,
David





----- Original Message -----
From: "Clair Davis" <clair.davis at charter.net>
To: <diy_efi at diy-efi.org>
Sent: Wednesday, October 17, 2012 10:55 PM
Subject: Re: [Diy_efi] Projects


> Probably a good refresher for me to think about this again.  I've talked a
> bit about my project with some of you in the past, most likely on the 
> GM-ECM
> list.
>
> My project is installing a GM TPI-based MPI on a 1969 Plymouth Valiant
> sedan.  The car was my daily driver for years, and I've been setting the 
> car
> up as a fun cruiser and SCCA auto-cross / road racer as it becomes more of

> a
> toy.  I started the swap to EFI after fuel and oil control issues became 
> the
> limiting handling factors.
>
> The system is based on a 7730, and includes a number of GM and
> Chrysler-based parts.  I'm tuning with TunerProRT and Moates' APU1, and I
> have some version of AUJP in the car now.  I have been able to drive the 
> car
> some, but most of my tuning progress was made just before and shortly 
> after
> my 1st son was born - 7 years ago.  I really need to get this car back on
> the road and enjoy driving it again, and the tuning is all that is
> preventing that from happening right now.   Idle is nice and WOT is
> surprising, but that bit in the middle is trouble...
>
> I'm hoping that over the next few months I'll be able to sort out the part
> throttle cruise problems enough to be able to drive it to a local dyno 
> shop
> and do some more detailed tuning off the highways and side streets.  I'm
> also seriously considering a move to a different control system if it will
> significantly ease my tuning chores, but I've got quite a bit invested in
> this OBD-I setup, so the benefit/cost has to be there.
>
> Here's some eye-candy for sticking with me so far...
>
> The car as she was right before the EFI project started, all the 
> suspension
> goodies in place:
>
http://www.moparfins.com/clairdavis/webimages/69sedan/In_The_Park2-PS-Clippe
> d.jpg
>
> And here's the engine after getting all the hard parts bolted down for
> keeps:
>
http://www.moparfins.com/clairdavis/webimages/69sedan/upgrades/efi/TB_Serp_O
> n-small.jpg
>
>
> Thanks,
>
> Clair
> DFWTX
>
>
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