Bob,
Put that into an excel spreadsheet...it's a bit hard to read in text...but I
understand what you're trying to do. Am I the "expert" (as you claim) on
the APEXi boxes? By no means...but i'll give you some phone numbers of the
tuning "experts" if you want them (heck, APEXi is in Orange, CA...call them
if you want).
The shop we're going to has been using the APEXi boxes on SD and MAF
vehicles for quite some time now (several years) and have proven it at the
track as well on various vehicles. Are they the "best shop" out there in
all the land...no. Thinking that would be silly as every shop specializes
in different ways of "tuning" a vehicle.
NO BOX out there will be 100% accurate in tuning examples as each vehicle is
different as are the modifications and conditions for each vehicle.
On the criticism, you're the one who started it as you seem to know the most
about all the different tuning boxes out there. Being opinionated is one
thing, criticizing every tuning option (offered as an option...not as a
"this is the ultimate fix" solution) is not the correct way to look at
things.
I know you're not running any of the SS (or other) tuning boxes as you're
waiting on testing the new offering to directly reprogram the PCM.
All things aside...sit back, relax, enjoy the conversations, and wait until
the results are final.
- Bernd
----- Original Message -----
From: "Bob Mankin" <bob@coralfarms.com>
To: <dakota-truck@dakota-truck.net>
Sent: Thursday, April 03, 2003 9:38 AM
Subject: RE: DML: #24 FMS Injectors
>
>
> Tim, here's an attempt to better explain the problem:
>
>
> 2500 2700 2900
>
> S1 S2 S3
> | | |
> | | |
> V V V
> ^ ^
> | |
> | |
> M1 M2
>
> 2600 3000
>
> Let's hope this carries through the email formatting. This is to show the
> granularity problem of the stock map versus the mod points of your SAFC.
> Let's say that your stock map value at S1 is 3% off the mark in trying to
> achieve proper A/F on your brand new 408. Let's also assume that at point
S2
> you are 8% off on the rich side, then 12% off at the point S3. The top
most
> and bottom most are the rpm point at which values change on the stock
> mapping(top) and bottom correction by the SAFC(bottom)
>
> S1 = stock fuel setting at 2500 rpm, 3% lean
> S2 = stock fuel setting at 2700 rpm, 8% rich
> S3 = stock fuel setting at 2900 rpm, 12% rich
>
> M1 = fuel trim in % modified at 2600 rpm by Apexi
> M2 = fuel trim in % modified at 3000 rpm by Apexi
>
> Now if Bernd wants to step in here and stick to the topic at hand rather
> than deflecting the criticism of the box by talking about mysterious 11
sec
> trucks and 10 sec Vipers, then maybe we can all actually learn something.
>
> He appears to be the resident expert on this Apexi box, so please provide
> the M1 and M2 values, as percentages since that is the way this box seems
to
> work, that will bring the values S1 thru S3 all down to zero. Keep in mind
> that a 3% miss from your target can result in A/F readings that are .5 off
> the mark. Dunno what you consider acceptable or "tuned", but that would be
> less than desirable in my book.
>
> This is a hypthetical scenario, but nonetheless a scenario that very
> accurately illustrates the problem of mismatch between the Apexi box and
the
> stock maps. If anything the hypothetical values I've given(and the
resulting
> difficulty of the tuning problem) may be on the CONSERVATIVE side for
anyone
> attempting to tune for a 408, as you soon will be Tim.
>
> And just to clear the record, Bernd you're about 10 months behind on
current
> events if you think I'm using a tuning box of any type and a few behind if
> you're vaguely referring to Scott using a S/S box on his 11 sec truck.
>
> Bob
>
>
>
This archive was generated by hypermail 2b29 : Fri Feb 06 2004 - 11:46:09 EST