1994 Mazda miata, (99' cylinder head and idle valve) 1.8l 4cyl...COP igniton, MSPNP gen 1,
42lb RX-8 Hi-imp injectors...naturally aspirated until my supercharger & meth-injection kit goes back on this weekend
...So for the first time in forever I finally have a good steady idle...but only when the car is perfectly warm
when warm* idle values are:
-900-1000 rpm - idle duty cycle @ 30%
-VE is at 37 - AFR: 13.2 - 14.0!!
- 8.0 req-fuel (425ccinjectors)
- pulse width: 1.8-2.0
- MAP:24-29 kPa
Air Fuel Ratio is around 13.3-14.0, very rich but if i take my idle VE cells
and cut every thing by -1 its in between 14.6-15.2....and it oscillates a bit more...good or bad? should i try to get it a little more lean?
Now the first start of the day is pretty rough, if im not blipping the throttle the second it starts to run, it dies.
also once I surpass that time period where I dont have to hold the throttle, it oscilates like crazy, until warm.
The second issue happens when I start the car again after its warm, but has been setting a few minutes
It cranks up just fine, but RPMs get low...like 700's-800's and the AFR gauge is crazy lean....I see AFR's of 17s, 18.0 + and it will go on for some time until i start to throttle it ...
please take a look at my tune and my data log
** the data log was taken after the car had been ran, but then set in the parking lot for about 3 hours... so CLT temps were 90* degrees
this data log does not reflect the SECOND issue that im talking about. just the cold/ warm up issues...i can post a second datalog If you would like to see that.
Good warm idle, but issues when cold, ASE, WUE
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Re: Good warm idle, but issues when cold, ASE, WUE
Are the temperature sensor readings accurate?
If so, it may just need some tweaks to the cranking pulse width and afterstart enrichment.
If so, it may just need some tweaks to the cranking pulse width and afterstart enrichment.
Matt Cramer -1966 Dodge Dart slant six running on MS3X
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Re: Good warm idle, but issues when cold, ASE, WUE
So from what I understand ASE is just added into warmup enrichment but only for the first ~30 seconds once the engine has started running.
- its strictly time based and only adds fuel related to that set time.
- from there on, its just warm-up enrichment when the car is idle (cold or CLT <160)
- until the throttle is moved, which then its using the VE table only?
When the car is still cold (CLT <160*) and I take off / drive anyways.. its pretty rich AFR's are like in the 12's
And I still just dont understand Cranking pulse widths... these are just extended fuel spraying times only while I'm starting the car?
SO, should I just add a few +1 or +2 to the ASE table values and a few 0.1's to the CPW's or do they need to stay linear to the base maps layout?
- its strictly time based and only adds fuel related to that set time.
- from there on, its just warm-up enrichment when the car is idle (cold or CLT <160)
- until the throttle is moved, which then its using the VE table only?
When the car is still cold (CLT <160*) and I take off / drive anyways.. its pretty rich AFR's are like in the 12's
And I still just dont understand Cranking pulse widths... these are just extended fuel spraying times only while I'm starting the car?
SO, should I just add a few +1 or +2 to the ASE table values and a few 0.1's to the CPW's or do they need to stay linear to the base maps layout?
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Re: Good warm idle, but issues when cold, ASE, WUE
Not quite. The warmup enrichment is applied across the board until the temperature reaches the point on your WUE curve where you have 100% WUE.deathtrapmiata wrote:So from what I understand ASE is just added into warmup enrichment but only for the first ~30 seconds once the engine has started running.
- its strictly time based and only adds fuel related to that set time.
- from there on, its just warm-up enrichment when the car is idle (cold or CLT <160)
- until the throttle is moved, which then its using the VE table only?
When the car is still cold (CLT <160*) and I take off / drive anyways.. its pretty rich AFR's are like in the 12's
And I still just dont understand Cranking pulse widths... these are just extended fuel spraying times only while I'm starting the car?
SO, should I just add a few +1 or +2 to the ASE table values and a few 0.1's to the CPW's or do they need to stay linear to the base maps layout?
MS1 cranking pulse widths are raw pulse widths used when RPM is below cranking RPM.
Matt Cramer -1966 Dodge Dart slant six running on MS3X