S300 Cranking Ignition Timing

Johnny_9 · Post by **Johnny_9** » Sun Jan 08, 2012 4:21 am

What is the cranking ignition timing for the S300? Mine reads -4 at 31 celsius. Is that normal

Pic below is for the Flash Pro for reference.

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Johnny_9 · Post by **Johnny_9** » Mon Jan 16, 2012 2:30 am

Some info from Hondata (S300) on this would be appreciated. There seems to be more limited info on this in the S300 vs Flashpro.

I read some where else that from a blog on a hondata seminar that cranking igniton does NOT use the ignistion tables.

Interested and need to know more about this.

Post by **Spunkster** » Mon Jan 16, 2012 5:12 pm

Are you having trouble starting the car?

Johnny_9 · Post by **Johnny_9** » Mon Jan 16, 2012 10:57 pm

I was comparing the stock P72 map which has a timing of "negative 4" (i.e 4 ATDC) at 500 rpm/3kpa.

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I used a another after market ECU before and the timing at 500rpm/3kpa is way different 8 degree BTDC.

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I just want to understand or confirm that in S300, that on firing (500 rpm) does the S300 ECU use a hidden cranking timing table* or is it using the ignition map at 500rpm/3kpa. At what point does the ECU switch to the main ignition map (from the hidden cranking map)

* I changed timing at 500rpm/3kpa and the engine still cranked at -4.SO ia m wondering what are those cells for and what should be the range of acceptable values

From my S300 datalog I can see that immediately after firing at 500 rpm the ghost traces the 500 rpm.3kpa cell.

I also want to know - does the cranking timing vary with ECT and if so that is the hardcoded values is cranking retarded 4 degree across all ECT?

As I using race cams i cant get the distributor/timing using "set timing" at 16 degrees

i also read this - Some programmable engine management systems have a default cranking advance of 15 degrees, a value about midway through the range of appropriate cranking advances. Smaller engines with faster cranking speeds need a greater ignition advance (up to 20 degrees), while slower cranking speeds of a high compression engine will require less advance (down to 10 degrees). The compression ratio of the engine will also determine the likelihood of kickback on starting. Engines with a low static compression ratio of 8:1 will accept an ignition advance of anything from 0-20 degrees without kick-back. A 10:1 compression ratio will reduce this to 15 degrees, 11:1 to around 10-12 degrees, while race engines using very high compression ratios of 12-13:1 can sometimes tolerate no cranking ignition advance at all.

Can cranking ignition be changed by rotating the distributor?

The above is from Flash Pro...guess you would change it is you radically upped the compression.

Johnny_9 · Post by **Johnny_9** » Tue Jan 17, 2012 4:45 am

Is your distributor is incorrectly set. would that affact crank timing, or can the ECU/sensor adjust for that?

Johnny_9 · Post by **Johnny_9** » Wed Jan 18, 2012 10:16 pm

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Posted earler, but i have clarified and simplied my question

1) The above is from Flashpro. What is the cranking timing for the S300 - hot and cold. I have data logged mine and would like to know what is the range

2) Does advancing/retarding the distributer have any affect on crank timing, or does the S300 compensate for that?

Johnny_9 · Post by **Johnny_9** » Tue Jan 24, 2012 8:36 pm

For reference

http://www.pencomputing.com/rsx/HondataSeminar.html

Hondata K-Pro Seminar March 13, 2004, Torrance, CA

"Cranking ignition values are in the first two rows, columns 8-10 in the table. Note that ignition is actually retarded there"

Question - is this applicable to S300?

Johnny_9 · Post by **Johnny_9** » Sun Feb 05, 2012 2:30 am

Johnny_9 wrote:For reference

http://www.pencomputing.com/rsx/HondataSeminar.html

Hondata K-Pro Seminar March 13, 2004, Torrance, CA

"Cranking ignition values are in the first two rows, columns 8-10 in the table. Note that ignition is actually retarded there"

Question - is this applicable to S300?

I just datalogged

Cranking timing is -4. at ECT 32 Celcius

Post cranking, just after the engine fires, at 500rpm load 103Kpa the ecu traces the ignition map.
Engines seems to like -4 timing there also

Next the engine goes to about 700 rpm and load 6-7, whatever the timing is there

Johnny_9 · Post by **Johnny_9** » Sun Feb 05, 2012 2:40 am

Spunkster wrote:Are you having trouble starting the car?

Got a new ported head. Engine fires, gets up to 1,000 rpm then stalls.

Do i need to tune the
-Fuel Comp. ECT Open loop low load?
-Fuel Comp. ECT CLOSED loop low load?

or post start fuel trim for the first 20 sec after engine fires?

Johnny_9 · Post by **Johnny_9** » Sun Feb 05, 2012 7:18 am

Is the answer Open Loop ECT Fuel trims, as the HO2 has not warmed up?

Hondata