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Some help with setting timing 5.0 stroked
Posted: Sun Dec 05, 2010 2:51 pm
by hatchssv8
Gents, I have posted this on another forum as well. The ECM experts here may have a different suggestion. Thanks .
""Got the motor run in yesterday, no problems at all. very happy so far
Of course all is good when you are running between 2 and 3 thousand rpm.
I set static advance at 10 degrees. then fired up straight away.
Today I am looking at tidy up stuff, fitted the thermostat, air box etc etc.
I want to know if I should change the timing (at the dizzy) to assist with a 'smoother' idle
Specs are Holden 5 stroked to 5.7. 9.5:1 comp Crane CD228-88, (retarded by 2 degrees) 228 duration @.050 , total duration 294, 110 separation.
I am running injected with a stock HSV 215 memcal. (Basically a HSV spec motor with Cam and springs changed
OH, total lift about 0.485 in
Any suggestions? ""
Re: Some help with setting timing 5.0 stroked
Posted: Sun Dec 05, 2010 4:23 pm
by Jayme
leave the dizzy at 10 deg and wind the idle spark up to about 25 degrees in the tune. it will help the idle a lot.
i did a 355 with flat tops and a crane 286 ish cam this is the idle spark (100kpa at the bottom)
24.61
24.61
24.61
24.61
24.61
24.61
24.61
23.91
21.45
18.98
17.58
make sure u change it in the main spark map and the idle spark map
Re: Some help with setting timing 5.0 stroked
Posted: Sun Dec 05, 2010 9:05 pm
by hatchssv8
Thanks, I will try that.
When I adjust in the Main spark map, do I change for both 400 and 800 rpm columns or only the 800.
What did you do there?
Re: Some help with setting timing 5.0 stroked
Posted: Sun Dec 05, 2010 11:08 pm
by Jayme
Disclaimer: This spark map was by no means a dyno perfected spot on map, nor have I spent much time smoothing out all the part throttle areas. it was made on the road with hope, gut feeling and a keen ear.
should get you on the right track.
- 355 spark.jpg (166.58 KiB) Viewed 4642 times
Re: Some help with setting timing 5.0 stroked
Posted: Mon Dec 06, 2010 6:50 pm
by hatchssv8
I'll try that.
I was also advised to change the idle speed to about 950 to compensate for the cam.
The same person also thought that if I have not changed the checksum in the bin, I would have problems. I am about to check, but from memory I did not change to $AA but left it at $5B. Is there any issue here?
Re: Some help with setting timing 5.0 stroked
Posted: Mon Dec 06, 2010 7:18 pm
by Jayme
it depends if the xdf you have calculates the checksum correctly, AA just disables the code form checking the checksum. I usually change it to AA just to be safe. youll know if it dont work... engine light straight on and stuck in limp mode.
950 idle sounds about right for a big cam, I think we had it in the 900's in the 355 I tuned from memory
Re: Some help with setting timing 5.0 stroked
Posted: Mon Jul 13, 2015 11:40 pm
by madmaxisback
Jayme wrote:leave the dizzy at 10 deg and wind the idle spark up to about 25 degrees in the tune. it will help the idle a lot.
i did a 355 with flat tops and a crane 286 ish cam this is the idle spark (100kpa at the bottom)
24.61
24.61
24.61
24.61
24.61
24.61
24.61
23.91
21.45
18.98
17.58
make sure u change it in the main spark map and the idle spark map
Thanks mate... This got me close with less hunt