Thanks Finn

I was just reading again a note from Tracy in the EC3 manual and this may well work in tandem, with the 8 table code/setup which I am using on my EC2.

See below:

——— 

Program Mode 7  (Cold Start on) Set  Manifold Pressure threshold for using RPM mixture correction table

When mode 7 is selected and the Cold Start switch is placed in the up position (On), Mode 7 will have an alternate function.  

Most users will not need to adjust this Mode but it is included for unusual engine configurations.

Pressing the store button will set the manifold pressure below which the EC3 will use the RPM mixture correction table.  This function was added to enable use with widely varying propeller loads at low throttle.  

This would include the use of variable pitch or constant speed  propellers.  

As with the other programming modes, this only functions while the engine is running.   

The suggested method of setting this mode is to run the engine on the ground (with prop installed) at low throttle and advance the throttle until the engine is running at around 2500 rpm and press the store button with Mode 7 selected and cold start switch on.   You may have to experiment with different prop settings when making this adjustment.  

———

I’m trying to get my head around how to implement this!!!

Steve Izett

On 27 Jun 2021, at 9:11 am, Finn Lassen finn.lassen@verizon.net <flyrotary@lancaironline.net> wrote:

The latest EC2 and EC3 software (CL8 -- Closed Loop 8) sort of addresses this problem with 8 RPM/MAP tables, I think:

 Table for 8-TABLE ROTARY ENGINE CONTROLLERS
 EC3 __ SN ____ MAP TABLE     DATE   _____________
       
0    ______      _____    <=  600 RPM  PG 0         _______
1    ______      _____           
2    ______      _____    0 – F USED WHEN MP
3    ______      _____    BELOW  13" Hg
4    ______      _____
5    ______      _____    0 – 1600 RPM
6    ______      _____    RPM DETERMINES
7    ______      _____     TABLE ADDRESS
8    ______      _____
9    ______      _____
A    ______      _____
B    ______      _____
C    ______      _____
D    ______      _____     
E    ______      _____   
F    ______      _____     1600 RPM_________________
10    ______      _____    8"          PG1   
11    ______      _____    USED ABOVE
12    ______      _____    13" Hg MP  AND RPM   
13    ______      _____    IS LESS THAN 1600
14    ______      _____
15    ______      _____    MANIFOLD PRESS
16    ______      _____    DETERMINES
17    ______      _____    TABLE ADDRESS
18    ______      _____
19    ______      _____
1A    ______      _____
1B    ______      _____          PRIMARY INJECTORS ONLY
1C    ______      _____              BELOW 20" Hg.
1D    ______      _____
1E    ______      _____           
1F    ______      _____      19.6"   ____________
20    ______      _____      8"           PG 2
21    ______      _____
22    ______      _____
23    ______      _____   
24    ______      _____       
25    ______      _____    USED  WHEN RPM
26    ______      _____    1600 – 2300
27    ______      _____         
28    ______      _____    MANIFOLD PRESS.
29    ______      _____    DETERMINES
2A    ______      _____    MAP TABLE ADDRESS
2B    ______      _____    IF MP < 20" Hg
2C    ______      _____
2D    ______      _____
2E    ______      _____
2F    ______      _____    19.6"_________________________
30    ______      _____    8"             PG3
31    ______      _____       USED WITH
32    ______      _____       RPM  2300 - 4000  AND
33    ______      _____       MP < 20" Hg
34    ______      _____
35    ______      _____
36    ______      _____
37    ______      _____
38    ______      _____    MP DETERMINES
39    ______      _____    MAP TABLE ADDRESS
3A    ______      _____
3B    ______      _____
3C    ______      _____
3D    ______      _____
3E    ______      _____
3F    ______      _____    19.6"            ____________________    

40    ______      _____  8"   PG 4_____________________
41    ______      _____
42    ______      _____
43    ______      _____
44    ______      _____
45    ______      _____
46    ______      _____
47    ______      _____    USED WHEN RPM
48    ______      _____     BETWEEN 4000 - 5000
49    ______      _____     AND MP <  20" Hg
4A    ______      _____
4B    ______      _____
4C    ______      _____
4D    ______      _____
4E    ______      _____   
4F    ______      _____ 19.6"________________________
50    ______      _____  8"       PG 5
51    ______      _____
52    ______      _____
53    ______      _____           
54    ______      _____
55    ______      _____           5000  - 7500 RPM
56    ______      _____         AND MP < 20" Hg
57    ______      _____
58    ______      _____          MANIFOLD PRESSURE
59    ______      _____          DETERMINES
5A    ______      _____         MAP TABLE ADDRESS
5B    ______      _____
5C    ______      _____
5D    ______      _____
5E    ______      _____    
5F    ______      _____  19.6" _________________________   
60    ______      _____  20"        PG 6
61    ______      _____
62    ______      _____       NO STAGING ABOVE 20"Hg
63    ______      _____   (SECONDARY INJECTORS ON)
64    ______      _____
65    ______      _____        USED BELOW 5000 RPM
66    ______      _____         AND MP > 20"  Hg
67    ______      _____           
68    ______      _____
69    ______      _____
6A    ______      _____
6B    ______      _____        MP DETERMINES
6C    ______      _____       MAP TABLE ADDRESS
6D    ______      _____
6E    ______      _____ 
6F    ______      _____  37" __________________________
70    ______      _____  20"       PG 7
71    ______      _____
72    ______      _____   
73    ______      _____    (SECONDARY INJECTORS ON)
74    ______      _____
75    ______      _____
76    ______      _____   
77    ______      _____      USED ABOVE 5000 RPM
78    ______      _____       AND MP > 20" Hg
79    ______      _____
7A    ______      _____
7B    ______      _____            MP DETERMINES
7C    ______      _____            MAP TABLE ADDRESS
7D    ______      _____
7E    ______      _____   
7F    ______      _____     >=  37” Hg MAP

Staging point    ______    (4-3)    (ROW – COLLUMN) ON
SECDIF        ______    (3-5)    ENGINE INFO SCREEN.
R1DIF        ______    (3-3)    Hold 4 & press 1 to
IPW RNG        ______    (4-6)    access.
IGNADJ        ______    (4-4)    Values are in HEX format
INJ FLOW    ______    (3-7)    on ENGINE INFO screen
MPTHRESH           _______   (4-7)

Don't know if that helps.

Finn

On 6/25/2021 7:54 AM, Matt Boiteau mattboiteau@gmail.com wrote:

With a fixed pitch prop and somewhat slippery plane. I have to bring prop RPM back to ~1300 to slow down. MAP is around 45kpa (13inhg). With my oversized and inefficient intake, it definitely makes the area hard to tune.

Do we know what the default timing is for Tracy's renesis programming? Has anyone debugged the code and created a RPM vs MAP spreadsheet? I have the RX8 tables from the car's ECU, but I have no clue if the plane is different. Especially at the landing configuration (high rpm, low map). Do we treat it like we are coasting down the hill, bump up to 35-38degree timing and lean it out. Or because we are still turning a prop, or the wind is turning the prop now, do we keep normal timing and best power afr?

- Matt Boiteau

On Thu, Jun 24, 2021 at 7:17 PM Stephen Izett stephen.izett@gmail.com <flyrotary@lancaironline.net> wrote:

Matt

On down wind we set:

Prop to full fine. 

AFR at best power 0.9 or 13.3

Same as Bobby, finding this area of the map very difficult to tune 

I have to manually adjust mixture as it tends to go very lean as we reduce airspeed.

I havn’t changed timing from default for Tracy’s Renesis programming.

Steve Izett

Renesis 4 port RD1-C EC2

On 24 Jun 2021, at 9:33 pm, Bobby Hughes BHughes@qnsinc.net <flyrotary@lancaironline.net> wrote:

With the CS prop at 2300 rpm and MP below 20” I found F/A between 15.8 and 14.5 worked well. I found this area very difficult to tune. Possibly because staging was set at 20”.  I have no idea what the EC3 time is in this area. 

 

Bobby

 

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] 
Sent: Thursday, June 24, 2021 8:25 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Timing / AFR landing

 

What AFR / spark timing are you guys aiming for on downwind / landing ?

 

- Matt Boiteau

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