mS on 2004
#121
Elite Member
iTrader: (10)
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,979
Total Cats: 356
I've done the mods. I'm waiting to place the MS back in the car along with some other mods to see if it works. Just too bysy at work these days.
(Baro MAP, Dual Tables, Launch Control, Shift Lights, EGT)
(Baro MAP, Dual Tables, Launch Control, Shift Lights, EGT)
#122
You show the knock sensor on your wiring diagram. Do you know yet what settings you're going to use for knock retard? Any idea how the stock ECU manages it?
I just got an O-scope this week and I'm going after my engine with a hammer this weekend to see what signals I get. Anyone know the proper way to whack an engine to simulate knock?
Frank
I just got an O-scope this week and I'm going after my engine with a hammer this weekend to see what signals I get. Anyone know the proper way to whack an engine to simulate knock?
Frank
#126
Junior Member
Thread Starter
iTrader: (1)
Join Date: Jan 2006
Location: Ontario, Canada
Posts: 95
Total Cats: 2
I didnt think we could disconnect the MAF doesnt the VVT use that for its operation?
While were talking about vvt does anyone have any ideas oh how timing should be controlled to work well with boost? (low boost high advance, high boost full retard?)
While were talking about vvt does anyone have any ideas oh how timing should be controlled to work well with boost? (low boost high advance, high boost full retard?)
#127
Elite Member
iTrader: (10)
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,979
Total Cats: 356
You can disconnect the MAF, the car will continue to run, however the VVT and the VTCS will not be operating. This means reduced midrange torque (VTCS) and higher emmisions (VVT). Like I said in my previous post, the VVT is controlled by a solenoid valve so you may actually be able to use the boost controller code to contro the VVT! I am still researching into the VTCS to see how it operates, however I am not really looking into doing anything with it, as I will ultimately install individual throttle bodies, therefor no more VTCS.
Jim
Jim
#128
VTCS can be operated by a "simple rpm switch". It only have two modes (thats what i've read at least).
VVT is operated by PID regulating pulse lengths of the binary valve. The CamAS is used as feedback.
If this is anything similar to boost control I don't know. If someone could make code/solutions to tune the VVT things would start to look extremly fantastic.
What would a Double-DIN complete MS setup cost (with a mediacenter+navi it would be a schweet setup )?
Just kidding but you're on to something really nice here.
VVT is operated by PID regulating pulse lengths of the binary valve. The CamAS is used as feedback.
If this is anything similar to boost control I don't know. If someone could make code/solutions to tune the VVT things would start to look extremly fantastic.
What would a Double-DIN complete MS setup cost (with a mediacenter+navi it would be a schweet setup )?
Just kidding but you're on to something really nice here.
#129
Elite Member
iTrader: (10)
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,979
Total Cats: 356
Jim
#130
As far as I've understood the VVT contol it's continously regulated even to keep the cam timing constant. Longer pulses to advance and shorter to retard (or the other way around). The CAS is used to tell the ECU what the cam timing actually is at the moment (in relation to the crank sensor).
There is no simple pulse lenght that will keep the timing constant in a system like this.
But I have not designed the system, only read posts on miata.net about a project trying to control the VVT. It looks like the Mazda solution is a bit different than what other manufactures have used.
There is no simple pulse lenght that will keep the timing constant in a system like this.
But I have not designed the system, only read posts on miata.net about a project trying to control the VVT. It looks like the Mazda solution is a bit different than what other manufactures have used.
#133
Junior Member
Thread Starter
iTrader: (1)
Join Date: Jan 2006
Location: Ontario, Canada
Posts: 95
Total Cats: 2
Anyone know what the maximum advance/ retard is on the intake cam?
I am from a mechanical back ground so a lot of this control stuff is pretty alien to me.
But a friend of mine is looking at ways to filter the stock crank and cam sensors so that they look like the cas sensor outputs. It looks like we have something that works. My main concern is that the intake cam is advanced or retarded so much that the two sensors (crank,cam) do not remain in relative phase, we need to use the intake cam signal as a reset for the crank sensor.
Given that the stock ecu takes timing of these two sensors it seems resonable that the vvt timing range is not great enough to prevent the intake cam to be used as a reset for the crank sensor.
This make any sense to you electrical guys?
I am from a mechanical back ground so a lot of this control stuff is pretty alien to me.
But a friend of mine is looking at ways to filter the stock crank and cam sensors so that they look like the cas sensor outputs. It looks like we have something that works. My main concern is that the intake cam is advanced or retarded so much that the two sensors (crank,cam) do not remain in relative phase, we need to use the intake cam signal as a reset for the crank sensor.
Given that the stock ecu takes timing of these two sensors it seems resonable that the vvt timing range is not great enough to prevent the intake cam to be used as a reset for the crank sensor.
This make any sense to you electrical guys?