TopDawg_43 Posted June 4, 2003 Report Share Posted June 4, 2003 I'm looking to find a good ignition curve for my Haltech. Â I'm trying to get as much of the program wrote that I possibly can. Â So far this is what I have: Idle- 10 degrees BTDC full load advance- 33 degrees full advance at 3500 rpm light load advance- 3 degrees boost retard of 10 degrees Also, does anybody know how many degrees BTDC the stock dist. hits the trigger? Any suggestions or advice will be greatly appericated. Link to comment Share on other sites More sharing options...
chiplee Posted June 4, 2003 Report Share Posted June 4, 2003 that's too much full load advance in my opinion. Â try 22 or so for a while and slowly add a degree to see what it does. Â the light load 3 degree thing looks kinda backwards. Â I have like 40 degrees in before boost and then gradually reduce advance as boost comes up. Â Someone posted a few of my timing values here somewhere. Â Look through this forum edit: ok I missed the 10degree boost retard part. so you're thinking 23 degrees at full load, which is reasonable. You can use alot more timing than that before boost comes on though. How does your computer control timing if you still have a boost retarding distributor? I'm not really familiar. Link to comment Share on other sites More sharing options...
TopDawg_43 Posted June 4, 2003 Author Report Share Posted June 4, 2003 . Â How does your computer control timing if you still have a boost retarding distributor? Â I'm not really familiar. I have to lock the distbutor. Meaning, disable the VA and remove the weights. Link to comment Share on other sites More sharing options...
TopDawg_43 Posted June 4, 2003 Author Report Share Posted June 4, 2003 Chip and Steve's ignition map - This is only a basic ignition map - - Uses at your own risk - *** 0 500 1000 1500 2000 2500 3000 3500 0 9.8 9.8 9.1 15.1 25.7 33.8 39.4 39.4 35 9.8 11.6 12.0 17.2 19.0 26.0 27.4 32.3 50 9.8 11.3 12.3 13.7 16.9 23.9 27.4 21.8 80 9.8 10.5 11.3 13.4 13.7 16.2 21.1 22.5 100 9.8 9.8 9.8 13.4 13.7 19.0 21.1 22.9 110 9.8 9.8 9.8 11.3 11.6 16.5 21.1 22.9 *** 4000 4500 5000 5500 6000 6500 7000 0 39.4 39.4 45.0 39.4 39.4 39.4 33.8 35 32.3 33.0 33.8 33.8 33.8 33.8 33.0 50 21.8 21.8 22.5 22.5 22.5 28.1 23.9 80 22.1 22.1 22.1 22.1 22.1 22.1 22.1 100 23.2 23.2 22.5 22.5 22.5 22.5 22.5 110 22.1 22.1 22.1 22.1 22.1 22.1 22.1 I'm not sure if I'm reading this right, but it appears that you are running 39 degree of full advance. And you are reaching that at 3000rpm. Correct me if that's wrong. Link to comment Share on other sites More sharing options...
chiplee Posted June 4, 2003 Report Share Posted June 4, 2003 well the thing is you'll never be at 3000+ RPM but be in the 0 load band. So you have to look at what would be reasonable load at 3k rpm. Notice it drops down quickly to less than 30 at 35% load. the resolution on the hawk is much finer than the values you see there. That's just a basic map, but it should get you started if you interpolate for the other values. I wish I had haltec experience. Link to comment Share on other sites More sharing options...
chiplee Posted June 4, 2003 Report Share Posted June 4, 2003 I have to lock the distbutor. Â Meaning, disable the VA and remove the weights. if you disable the vacuum advance how does the boost retard work? that was the real reason for my original question see. The hawk uses a magna distributor with no weights or springs or VA. It's fully computer controlled timing, which I'm sure your's is too but I don't understand using computer controlled timing and vacuum advance or boost retard. Link to comment Share on other sites More sharing options...
TopDawg_43 Posted June 5, 2003 Author Report Share Posted June 5, 2003 if you disable the vacuum advance how does the boost retard work? Â that was the real reason for my original question see. Â The hawk uses a magna distributor with no weights or springs or VA. Â It's fully computer controlled timing, which I'm sure your's is too but I don't understand using computer controlled timing and vacuum advance or boost retard. The boost retard is done by the ECU, not exactly sure how. But I believe it's fully computer controlled timing also. I was reading the manual again last night, and the light load advance, is equal to what the VA would do. If you read in the first post, you see were I have a light load advance of 3 degrees. Take it EZ~ Link to comment Share on other sites More sharing options...
Joel Posted June 5, 2003 Report Share Posted June 5, 2003 to retard the timing with boost you just retard the timing up each RPM map. You can configure a very nice and configurable "boost retard" that way. "Full advance" should take place by 3000RPM, 30Deg Full advance, then knock the timing back from 4-5psi up from there by a deg for each bar all the way up. Ignore the "boost retard" feature, IMO, because it slams the ignition advance down and the car will pick up like a dog. Sorry I hadn't gotten back to you, Send me your email addy and I'll send you a configured map to look at/use/copy or whatever you like. As far as the dist trigger angle, If you dont get any responses just set it for 50-60 deg, then start the car (if it will) and put the timing light on it... adjust the value of the trigger angle while the car is on (and the timing lock is on at 10deg) until you line it up with 10deg. If it says 15BTDC on the light, add 5 deg. to the trigger angle value. If your timing is 5BTDC add 5 deg to the trigger angle value. Keep in mind, if anyone here has done this that you timing could be off still by as much as 15deg (+/-) unless you time it like that mentioned above here. It depends on where on the dist. mount slot the dist. has been installed. Joel Link to comment Share on other sites More sharing options...
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