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Laurent
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CDI+ over 3500rpm
Hi everyone, I'm new on this forum, writing from France.
I recently bought a brand new CDI+ 6-pin for my 1986 930 Turbo. It's plug and play and the engine strated immediately. but, on the test drive, it went well until ... I heard weird motor noises starting with ca. 3500rpm. Any clue on that?  Best, Laurent |
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03-06-2022, 11:23 PM
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Registered
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Laurent, you will need to provide more details about your car. If you can provide a video of the noise at 3500rpm that would help immensely. Also a picture of you 930 is helpful to get more attention.
Rahl
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1976 930 turbo Carrera, "Ubich". Mostly stock, lightly sweetened. She’s an angry schwierigkeit. She doesn’t want flowers, she just wants to dance! And when she does, she shakes her hips to the rythem of the road. Drive her like you hate her! |
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03-07-2022, 11:59 AM
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Laurent
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All right, thanks. Will do, but in a couple of weeks since I’ll be travelling until then.
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03-07-2022, 12:31 PM
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Laurent
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Answer received from Classic Retrofit : coil is probably too old to match the electrical requirements of a double spark within 400 ms …
I will swap coils, try again, and let you know! |
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03-09-2022, 04:50 AM
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Laurent
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I finally had the opportunity to modify the CDI+ setup, as advised by Jonny from Classic Retrofit. I then had to (i) change the coil et (ii) reset the spark interval from 400ms to 500ms, which I did within minutes. The engine started normally et revved to 4000rpm without a problem.
During the test drive, Where I went up to 6500 rpm, I had the feeling I changed the turbo ! So now it works 100% and the improvement is huge …  
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03-20-2022, 07:24 AM
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Registered
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Always like a happy story on Monday!
__________________
2014 Cayman S (track rat w/GT4 suspension) 1979 930 (475 rwhp at 0.95 bar) |
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03-21-2022, 07:08 AM
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Laurent
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Yes! So happy
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03-21-2022, 10:20 AM
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Tobias A
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Did you first use the original Porsche Bosch coil? What kind did you swap to?
I will also be installing the CDI+ in my 1986 Porsche 930 Turbo. Best Regards Tobias |
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03-22-2022, 01:19 PM
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Laurent
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Hi Tobias,
I first left the original and old Bosch coil in place (because I was lazy) and that new CDI+ was probably too much for it. I sent an e-mail to Classic Retrofit to get their advise on the recommended coil to a CDI+. Their reply was the one from Partsklassic (https://www.************.com/p-1586-cdi-ignition-coil-by-************.aspx) which seems to represent the best choice, which is what I did. If you do that, make sure the bracket is adapted: the one which is delivered with the coil is a tiny bit too high and touches the intercooler. I had to swap it with the older bracket so that it works. Other than that, this is just fine
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03-23-2022, 12:39 PM
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Tobias A
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Great info! Thanks :-)
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03-25-2022, 02:54 PM
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Registered
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Thanks for this writeup! I've got one I need to install this spring and good to know about the potential coil issues!
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'79 930 turbo RoW - Oak Green Metallic - k27-7200 Raptor - Kokeln Intercooler - RarlyL8 headers/muffler - Tial 46mm - 964 turbo WuR - Rebel racing bushings front/rear - ER Monoballs front/rear - ER adjustable spring plates - 29/23mm TBs - Vons level 2 - Raised spindles w/weld on racing bump steer knuckle -Wevo engine mounts - Rebel racing transmission mounts - Ruf speelines 17x9-10 - Classic retrofit electric A/C |
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03-29-2022, 01:07 PM
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Laurent
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 and yes, by the way, here is the newly CDI+ upgraded car
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03-31-2022, 05:00 AM
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930
1976 Porsche 930
1979 Porsche 930 3.4
Missy
1979 Porsche Turbo
1999 Toyota 4Runner
