had some questions regarding the c2 kit vs other options such as the
unless you have input on the above 3, lets just say they are nearing or surpassing the $1000 mark, and as virtual if not complete standalones, require
some heavy tuning and install - with or without a dyno, but of course with a wideband.
now for the c2 kit at ~$450(?)
Jefnes/Collier - Custom chips, which are great according to the setup you have obviously. No need to run an FMU (from what I've heard), but you have to
run 30lb injectors I've been told, for the basic chip that Jeff makes. 4" maf as well. Also, "smooth"...from what people have said here on the boards.
so you got the drop in(?) eprom chip, larger injectors (optional), and larger 4" MAF (optional).
1. how does a MAF (Mass Air Flow) sensor detect boost, assuming its the only sensor involved? basically, how does it work?
afaik a MAP (Manifold Absolute Pressure) is the preferred sensor, as it detects negative (vacuum) to positive (boost) pressure, usually using a linear scale
of 0-5volts as output to the ecu.
2. what is the resolution of the fuel/ignition tables in your chip vs stock (assuming vw uses a table format, and your chip has additional ones)?
3. a.how does it handle closed loop (assuming o2 sensor readout to maintain stoich/14.7 AF)?
b. how does it handle open loop (assuming ecu table lookup during WOT/full throttle and warm up)?
c. mainly, how does it handle the transition between the two in part throttle, and the transition into and out of boost?
4. a. how is one program able to account for different setups? im not familiar with all the sensors involved, but as far as the above two, it doesnt seem
capable of providing enough tuning range (limited maps).
b. i noticed mention of autotune. outside tuners seem to not use this much (even when available) and prefer the manual method. how is yours able to do
this? does it interpolate neighboring cells?
5. a. in the event of a ***** of a problem, ie hesitation, hiccups, off throttle bog, bucking into/out of boost, etc. how would one get this tuned out without
bringing the vehicle to you personally to tune with a wideband? a long distance tune involving a million reburns doesnt seem efficient..
b. how can autotune work without a wideband?
c. what if we have a wideband, can we send you the logs, and if so, do you need a specific format and/or other sensor readouts as well?
6. what if we have an eprom burner, can we tune ourselves?
7. i know obd1 is in development, how is it going? how much of a transition is it from obd2? i know with other cars obd0 to obd1 is enormous and almost
an entirely different project, as is obd2, so most ditch obd2 and just convert to obd1.
8. thank you my good man. i hope i'm not asking you to divulge too many of your secrets. i feel these would help my understanding and trust in your
system. don't know if you can tell, but im mainly from the honda camp and am somewhat involved in the development of homemade software to help us
do-it-yourself'ers tune our obd-0 and obd-1 ecu's without having to buy a full fledged standalone system.
EDIT: oops sorry i just found the standalone thread here http://forums.vwvortex.com/zer...age=1 however this post is more towards avoiding the cost of a standalone and putting the time in to tune yourself.
Modified by XDEep at 8:28 AM 3-4-2004