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Old 03-17-2006, 09:58 PM   #1
Rooz

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humm.. ur car is an M?
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Umnitza now provides a mechanic to install all parts ordered right in the box! It's their new "Total customer service program" that will eliminate all the haters and keep incompetents from breaking **** and blaming the vendor! When you are all set simply call INS and they will pick him up free of charge.
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Old 03-17-2006, 10:38 PM   #2
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Much more responsive with a kick! ,much smoother idle, and thats with 5 month old plugs.
i actually just bought some fresh plugs im goin to drop in, which should improve it somewhat, but overall, definitely worth the money.
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Old 03-31-2009, 09:54 AM   #3
C Sean Watts

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I see this is an old-ish thread.

I'm ordering some for my '97. The car runs well as it is but I have used MSD and Jacob's coils on other cars and the improvement from coils alone was always worth it in long run.

I'll be posting before and after results....

BTW, DOES ANYONE KNOW WHO MANUFACTURES THESE? BAV isn't sharing too much..
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Old 05-08-2009, 08:35 PM   #4
C Sean Watts

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Originally Posted by C Sean Watts View Post
I'm ordering some for my '97. The car runs well as it is but I have used MSD and Jacob's coils on other cars and the improvement from coils alone was always worth it in long run.

I'll be posting before and after results....

BTW, DOES ANYONE KNOW WHO MANUFACTURES THESE? BAV isn't sharing too much..
UPDATE: I got them and measured the resistance of the primary sides on all coils. All are in the factory range 0.4 to 0.8 Ohm. I installed them...I changed NOTHING but the coils.
1. Slightly quicker start up warm and cold.
2. Idle is about the same. Idle was smooth before the change so I'm not surprised.
3. BIG improvement in acceleration, felt and measured. I went to a known 1800 foot marked area with little traffic. Started from a stop and WOT to the end. With stock coils = 0.40 seconds slower.

4. I'll update with mileage differences in a few tank fulls.

Last edited by C Sean Watts; 05-08-2009 at 08:37 PM..
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Old 05-08-2009, 11:44 PM   #5
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Quote:
Originally Posted by C Sean Watts View Post
UPDATE: I got them and measured the resistance of the primary sides on all coils. All are in the factory range 0.4 to 0.8 Ohm. I installed them...I changed NOTHING but the coils.
1. Slightly quicker start up warm and cold.
2. Idle is about the same. Idle was smooth before the change so I'm not surprised.
3. BIG improvement in acceleration, felt and measured. I went to a known 1800 foot marked area with little traffic. Started from a stop and WOT to the end. With stock coils = 0.40 seconds slower.

4. I'll update with mileage differences in a few tank fulls.
its more new vs old thing, the coils add nothing much if any at all there have been a number of tests that showed without a doubt that "H.O/performance" coils showed zero gains.
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Old 05-10-2009, 12:23 PM   #6
C Sean Watts

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its more new vs old thing, the coils add nothing much if any at all there have been a number of tests that showed without a doubt that "H.O/performance" coils showed zero gains.

Disclosure: I am not affiliated in any way with the company making or selling the parts I use, test or describe.


What we do know about flyback transformers, or LOPT, is they do not "get old and wear out" without some kind of quantifiable failure. Mechanical failure in them like a break or short in one of the windings do cause them to fail. In an OBDII car (at least according to the BMW FSM) will cause a MIL/CEL. I had neither case. The original coils also measured within factory specs (primary side resistance.) We also know that potential (voltage) makes the spark happen. But, it's current (amps) that light the fuel. Too much of either and NEITHER will happen. Since I did not change primary input, the only way to effect secondary output is to change the coils, themselves.

My experience over 20+ years of street and track - parts and service has included using Jacob's Electronics systems, Accel and MSD systems. The results all varied as much as the engines they were put on. The ONLY time I measure a zero gain was when an electronic ignition module happened to fail at the time we were testing. The change I described was carefully tested, measured and repeated.

Anyone interested in this subject, I refer you to the book by Dr. Christopher Jacobs, Performance Ignition Systems published by HP books #HP1306.

About 19 years ago, I had one of his first edition books on the same subject. It clearly takes electrical engineering theory and explains it in practical terms, as used in the real world.
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