Tuning with twin maximum flow adjuster
in [Aussie Drivers]
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From: Yvan on 10 Jan 2008 16:45 Nedavno Yvan piše: > And now I have no spark at all. I checked ignition coil primary and > secondary resistance (but I did not disconnect leads at terminals) - > OK. ~0.8ohm, and ~8kohm. I've done some testing today. I connected battery + to the 15 terminal of the ignition coil, terminal 1 to the one side of the capacitor, and the other side of the capacitor to the ground. I then connected one side of a wire to the ground and with other side touched terminal 1. No spark at the grounded spark plug connected to the HT lead from the tower connector of the ignition coil. So it seems that at least ignition coil is toasted. Can I put old (but working) ignition coil used in a car that had pints in the place of this TCI coil? Just for a short time to test if I fried anything else? I also read somewhere on the Internet that I can connect test light to the terminal 1 of the coil to see if it blinks while engine is cranking. Does that apply only for points ignition system, or I can test TCI system too? P.S. Hey John, any progress with clarification of your post about timing advance? -- ___ ____ /__/ / \ ** Registrovani korisnik Linuksa #291606 ** / / \/ /\ \ ** Registered Linux user #291606 ** /__/\____/--\__\ ** http://counter.li.org/ **
From: John McKenzie on 12 Jan 2008 23:48 Yvan wrote: > > Can I put old (but working) ignition coil used in a car that had pints > in the place of this TCI coil? Just for a short time to test if I fried > anything else? It'll run, but not for long usually (then again who knows, I suspect at some time they'll stop making points spec coils) > > I also read somewhere on the Internet that I can connect test light to > the terminal 1 of the coil to see if it blinks while engine is > cranking. Does that apply only for points ignition system, or I can > test TCI system too? If it's a system that runs higher than around 9-12 volts to the coil, it'll probably blow the globe pretty quickly. > > P.S. Hey John, any progress with clarification of your post about timing > advance? http://jmacperformance.com/my%20attempted%20ignition%20map.JPG Is about as far as I got. I left a few blank in the centre, you'd obviously want to 'smooth' it out a bit. Also - I cut n pasted the wrong number - at 70%/5500 it should be 31 not 27 The reason I put a fair bit more in the 10% high rpm range is because lpg setups are known to backfire on deceleration at higher rpms, and that cures it. It could probably stand more advance in the 10-30% and 1000-3000rpm range, but that is as far as I got. It's a hell of a lot easier to recurve a conventional distributor than get every number exact. > -- > ___ ____ > /__/ / \ ** Registrovani korisnik Linuksa #291606 ** > / / \/ /\ \ ** Registered Linux user #291606 ** > /__/\____/--\__\ ** http://counter.li.org/ ** -- John McKenzie tosspam(a)aol.com abuse(a)yahoo.com abuse(a)hotmail.com abuse(a)earthlink.com abuse(a)aol.com vice.president(a)whitehouse.gov president(a)whitehouse.gov sweep.day(a)accc.gov.au uce(a)ftc.gov admin(a)loopback abuse(a)iprimus.com.au $LOGIN(a)localhost world's #1 sardine whisperer root(a)mailloop.com $USER@$HOST $LOGNAME(a)localhost -h1024(a)localhost abuse(a)msn.com abuse(a)federalpolice.gov.au fraudinfo(a)psinet.com abuse(a)asio.gov.au $USER(a)localhost abuse(a)sprint.com abuse(a)fbi.gov abuse(a)cia.gov
From: Yvan on 13 Jan 2008 05:10 Nedavno John McKenzie piše: >> Can I put old (but working) ignition coil used in a car that had >> pints in the place of this TCI coil? Just for a short time to test if >> I fried anything else? > > It'll run, but not for long usually (then again who knows, I suspect > at some time they'll stop making points spec coils) I already tested this, and I can not start the engine. I have a spark, but perhaps it is to week. I pulled out HT leads, connected it to a set of spare spark plugs, and all four have a spark. I will try to find correct ignition coil at wreck yards and try again. >> I also read somewhere on the Internet that I can connect test light >> to the terminal 1 of the coil to see if it blinks while engine is >> cranking. Does that apply only for points ignition system, or I can >> test TCI system too? > > If it's a system that runs higher than around 9-12 volts to the coil, > it'll probably blow the globe pretty quickly. No, it has battery voltage at terminal 15 (+). It did not blow, and it blinked while I cranked the engine. >> P.S. Hey John, any progress with clarification of your post about >> timing advance? > > http://jmacperformance.com/my%20attempted%20ignition%20map.JPG > > Is about as far as I got. I left a few blank in the centre, you'd > obviously want to 'smooth' it out a bit. > > Also - I cut n pasted the wrong number - at 70%/5500 it should be 31 > not 27 > > The reason I put a fair bit more in the 10% high rpm range is because > lpg setups are known to backfire on deceleration at higher rpms, and > that cures it. > > It could probably stand more advance in the 10-30% and 1000-3000rpm > range, but that is as far as I got. It's a hell of a lot easier to > recurve a conventional distributor than get every number exact. I am a bit confused here. You wrote: "I tend to find around 2600rpm is about as low as you'd want max advance to have come in by. In some applications where the compression ratio is high enough, you often find it might run better softening the mech advance curve to come in by 3000rpm". And Noddy wrote: "Most times you'd want all your timing in by 2500rpm, but it would depend largely on the engine in question". At 100% load, when vacuum advance is 0, and only mechanical and initial advance is present I should have max advance at 2500 - 3000 rpm. You set that at 3500. Also: "My own experiences generally have shown that any time an engine liked more than around 30 degrees total timing, it was running a very low..." If you take a look at default ignition map for petrol - top one here: http://www.ptt.yu/korisnici/i/v/ivica/lpg/IgnitionMaps.jpg max advance is 36 degrees - less than you have set (40), yet you wrote: "Generally whilst lpg likes less total advance, it can usually tolerate that mechanical advance coming in a little earlier". I forgot to edit rpm bins (max rpm for my engine is 6400), so I did now and here is your ignition map in text (use some proportional font): load/rpm| 500|1000|1500|2000|2500|3000|3500|4500|5500|6500| 10 | 15 | 18 | 21 | 25 | 28 | 35 | 39 | 39 | 40 | 40 | 20 | 15 | 18 | 21 | 25 | 28 | 35 | 37 | 37 | 39 | 39 | 30 | 15 | 18 | 21 | 25 | 28 | 35 | 36 | 36 | 36 | 36 | 40 | 14 | 16 | 20 | 25 | 27 | 28 | 35 | 35 | 35 | 35 | 50 | 14 | 16 | 20 | 25 | 27 | 28 | 34 | 34 | 34 | 34 | 60 | 13 | 16 | 19 | 25 | | 27 | 33 | 33 | 33 | 33 | 70 | 12 | 16 | 19 | 24 | | 27 | 27 | 29 | 30 | 31 | 80 | 12 | 15 | 19 | 24 | 27 | 28 | 28 | 28 | 29 | 29 | 90 | 11 | 15 | 18 | 23 | 27 | 28 | 28 | 28 | 28 | 28 | 100 | 11 | 15 | 18 | 22 | 26 | 27 | 28 | 28 | 28 | 28 | Why the big jump at 3000 rpm? I guess I should smooth it a bit (not easy at 2500 rpm, as it's only 2 deg difference between 10% and 100% load). So here: load/rpm| 500|1000|1500|2000|2500|3000|3500|4500|5500|6500| 10 | 15 | 18 | 21 | 25 | 28 | 35 | 39 | 39 | 40 | 40 | 20 | 15 | 18 | 21 | 25 | 28 | 35 | 37 | 37 | 39 | 39 | 30 | 15 | 18 | 21 | 25 | 28 | 35 | 36 | 36 | 36 | 36 | 40 | 14 | 16 | 20 | 25 | 27 | 28 | 35 | 35 | 35 | 35 | 50 | 14 | 16 | 20 | 25 | 27 | 28 | 34 | 34 | 34 | 34 | 60 | 13 | 16 | 19 | 25 | 27 | 27 | 33 | 33 | 33 | 33 | 70 | 12 | 16 | 19 | 24 | 27 | 27 | 27 | 29 | 30 | 31 | 80 | 12 | 15 | 19 | 24 | 26 | 28 | 28 | 28 | 29 | 29 | 90 | 11 | 15 | 18 | 23 | 26 | 28 | 28 | 28 | 28 | 28 | 100 | 11 | 15 | 18 | 22 | 25 | 27 | 28 | 28 | 28 | 28 | Still I am not sure what to do with a big jump at 3000 rpm. Sorry for being such a bore, but I expect that MegaJolt ignition controll module arrives every day now, and I want to have my initial ignition map ready. -- ___ ____ /__/ / \ ** Registrovani korisnik Linuksa #291606 ** / / \/ /\ \ ** Registered Linux user #291606 ** /__/\____/--\__\ ** http://counter.li.org/ **
From: Yvan on 16 Jan 2008 14:09 Nedavno Yvan piše: > And now I have no spark at all. I checked ignition coil primary and > secondary resistance (but I did not disconnect leads at terminals) - > OK. ~0.8ohm, and ~8kohm. Ignition control unit has 12V and ground, > connection to ignition coil is OK, and trigger wheel in the > distributor has ~1kohm (as it should). Only value that is out is > trigger wheel output voltage, it should be 1-2 V and I have 0.8 V. But > it's -5 degrees Celsius out. It's not that far out, but I have no > spark :-( I guess it probably died while the engine was running on > EDIS. I probably should have dissconnected power to the ignition coil > and the ignition control unit. It was the ignition coil. I just fitted the new one, and it now runs as before. -- ___ ____ /__/ / \ ** Registrovani korisnik Linuksa #291606 ** / / \/ /\ \ ** Registered Linux user #291606 ** /__/\____/--\__\ ** http://counter.li.org/ **
From: Yvan on 18 Jan 2008 15:30
Nedavno Yvan piše: > It is interesting to see that ignition advance retards after 3500 rpm. > I wonder how do BMW make their distributors to do that. ^and why -- ___ ____ /__/ / \ ** Registrovani korisnik Linuksa #291606 ** / / \/ /\ \ ** Registered Linux user #291606 ** /__/\____/--\__\ ** http://counter.li.org/ ** |