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Forum: General Q & A
10-08-2005, 05:32 PM
Replies: 23
Views: 9,397
Posted By mats

Re: Total timing for modified 502 MPI ???

Continuing ón the previous post; 15 cam/distributor degrees would correspond to almost half an inch gap to jump at 30 degrees advance, with zero base timing. If I remember it correctly from school...
Forum: General Q & A
10-08-2005, 04:34 PM
Replies: 23
Views: 9,397
Posted By mats

Re: Total timing for modified 502 MPI ???

Well, going back to the subject, I think that you have a point. But then again you can question why the ignition module has to assume an 8 degree basetiming. It would just be to throw in other...
Forum: General Q & A
10-08-2005, 01:06 PM
Replies: 23
Views: 9,397
Posted By mats

Smile Re: Total timing for modified 502 MPI ???

So it is a feedback loop at idle.
Forum: General Q & A
10-08-2005, 11:27 AM
Replies: 23
Views: 9,397
Posted By mats

Re: Total timing for modified 502 MPI ???

Well, I read it in a book somewhere. I may of course have misunderstood it. I understood it to be similar to the Mean Best Timing in the Thunderbolt V ignition system.
So if I understand you...
Forum: General Q & A
10-08-2005, 03:06 AM
Replies: 23
Views: 9,397
Posted By mats

Re: Total timing for modified 502 MPI ???

You are right. It is blind to the position of the crank/ cam. But since the ECM will try to regulate the advance to find the best performance (highest rpm in a given situation, throttle, load, etc)...
Forum: General Q & A
10-07-2005, 11:53 AM
Replies: 23
Views: 9,397
Posted By mats

Re: Total timing for modified 502 MPI ???

Another comment. At higher rpms you can fool the ECM by bumping the initial advance. However, at lower rpms (If I recall it correctly up to some 3000 rpm) the ECM is actively regulating the advance...
Forum: General Q & A
10-06-2005, 03:12 PM
Replies: 23
Views: 9,397
Posted By mats

Re: Total timing for modified 502 MPI ???

One more thought. As I said, either the ECM or the Scan tool adds the 8 degrees. The ECM obviously knows that it is sitting in a 502 MPI and that the initial timig should be 8 degrees so it would be...
Forum: General Q & A
10-06-2005, 02:46 PM
Replies: 23
Views: 9,397
Posted By mats

Re: Total timing for modified 502 MPI ???

This is how I have understood it; Neither the scan tool nor the ECM can actually know what you have set the Base timing to. If they did you would not have to use a timing light, it could all have...
Forum: General Q & A
10-05-2005, 02:19 PM
Replies: 23
Views: 9,397
Posted By mats

Re: Total timing for modified 502 MPI ???

Just as a clarification, the scan-tool shows the total advance, assuming that the base timing is set to 8 degrees. If you bump the initial advance to 10 degrees, it will still show 30 degrees at...
Showing results 1 to 9 of 9


 
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