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Banned
Join Date: Dec 2011
Posts: 730
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87 930 spark time too short
My tech man just install my rebuild cdi to my car, but he told me the spark time is too short. I had try two different CDI(both just got rebuild back). The result is same. can any one tell me where should I check? Thanks and happy holiday.
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12-29-2013, 07:35 AM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,125
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Send a PM to "wwest", he knows ignition well and I believe an EE.
He can probably tell you what you need to know. Not sure though if the duration is shown in the screenshot which I'm sure he will need.
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR P & C's, 993SS cams, Borg-Warner S366 turbo @ 1.2-1.5 bar, depending on mood  , Treadstone full bay IC, 70mm TB, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MicroSquirt AMP'd w/GM smart coilpack, Bilstein coilovers, Tramont wheels (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel
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12-29-2013, 12:24 PM
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Ingenieur
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Can't tell without some numbers on the scope, but the waveform looks OK. Are you sure your tech is applying the right criteria for your CDI type ignition? Bosch CDI spark duration is only 0.1 to 0.3 milliseconds. Most modern inductive type ignitions are greater than 1.5 milliseconds spark duration. Maybe your tech thinks your CDI ignition should also be 1.5 mS, in which case he is mistaken.
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12-29-2013, 01:21 PM
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Registered
Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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whats wrong with the car?
i have looked at the output of the CD which is negative. more info would be needed on the test EQ, but some of it does not look right and part looks like oscilations or ringing. what stands out is that all 6 are not the same.
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86 930 94kmiles [_  _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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12-30-2013, 09:44 AM
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