Hi Kris.
On the MS I had a internal map sensor rated at 250 kpa - 1 atmosphere = 22 psi limit approx, you know what i mean.
Just wired up a gm 3 bar, so have to re do the ve tables again ..
The MS gave good fuel, around 25 mpg, with light use far better than the denso ever did.
Was only the problem with knock sensor system that made me switch over to the denso, after doing this, I get error codes on denso, this was 02 & knock, knock sorted now, o2 via the wideband on an1
The denso is the get me home unit, it amazes me; I want to hack it for complete control.
I had to go though all the systems on the gt4, this its self takes time, as I have 2 complete ecu’s to check out , a mobile lab.
Took this time to update the ms firmware, and install 3 bar map sensor, this will increase the working limit to 28 psi, also further improvement to the dizzy inputs, and further air temps sensors modifications etc, always something else to try out.
Hopefully I will get out this afternoon; it always takes longer than you give it, it’s the calibration that’s timely on the bench, before any tuning time can take place.
I data log every time I use the car, but recently I have stopped reviewing the logs, as time has been short, until this.
Does the MS have the capability for fuel overrun cut off/deceleration cut off?
Answer=Yes, the MS has full control over this ,the stock denso barrel washes compared to the ms, I have done many tests on decel/overrun, from na to boosted run etc.
You need fuel on over run / deceleration for cooling, etc, but linking temps to a value bin allows varying degrees of this as and when required, the denso waits 3 seconds before running its routine, does not sound much but on a few thousand miles starts to add up.
The ms will run its routine down to the 3rd engine cycle on over run/deceleration before implementing it routine, a balance of cooling to wash out has to be met.
Are you using feedback from the O2 sensor to correct the fuelling?
Answer = Yes Using wideband, have two outputs, 1 narrow band analogue 1, 1 wideband analogue 2. the ms runs with both, the denso on an1.
The MS can be set to enter closed loop at idle, it does not need to run in this mode, as the ve tables allow 14.7 to be maintained, I run closed loop on events that last longer than 15 seconds on constant tps feedback as well as other inputs.
For tuning I turn off all o2 feed back & routines, start the table tuning, once happy, turn 02 on and its all working, the ms has a little of everything available, just needs to grow in size a few times.
the denso without 02 will run, but once the internal map area limit has been breached, with out feed back from o2 it will continue to run very rich, by resetting the denso, using a different o2 sensor the denso will learn, but only to a point.
On the ms I use auto tune with the wideband, this then reworks the tables from what I have, to presets for what I want, go for a drive, after that, I run vexit for new table to be generated, then burn the table to rom, & save to drive, then start again.
the ms is great if you load new tables for what you have in mind, so town driving map1, motor way map2, flat-out map3.
Preparing for a turbo upgrade shortly, hopefully slide some new pistons in, and away we go for another 3000 miles.
My original aim was to hit 300 bhp using the stock bottom end, then stop at that, but I can’t stop, i have max 185 & 205 injectors to 99% with increased fuel rail pressure too, i am shortly going to try a pwm dc to dc converter, giving fuel pump power full control from 6 volts to 20 volts, should increase fuel pressure and flow a little more.
Ok its time for me to head out to install some new bits, and some running repairs to the 4 will hopefully know more soon of improvements
DJ
_________________ Black UK 96 205 shed with heater full on telemetry.
project six million dollar 185, faster, stronger, lighter than before.
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