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Vipergrün 01-30-2006 02:19 AM

Converting CIS to ITB's/EFI: Re-curve distributor?
Hey ya'll, as the subject says, I am converting from CIS to ITB's and EFI on my 80 3.0l motor. Should I, or do I need to re-curve the distributor? For the time being, I'll use stock cams and pistons....

Should also note that I am doing fuel only at this point using MegaSquirt. I also have MSD CD unit.


CEO 01-30-2006 05:24 PM

How much did you pay for the Jenvey ITB setup. I am looking for a 48mm Taper and dont know who has the best prices.

Vipergrün 01-30-2006 06:46 PM

Kenneth, I got a "promotional" deal on the Jenveys and was asked not to disclose the cost :) That being said, I would recommend contacting Mike at Motomotions, he can also hook you up with MegaSquirt if you need an ECU. You can also try Mack at Emerald Performance. While not a Porsche shop, he has been helpful in working thru some issues I had. If you are using a filter setup, such as ITG, make sure you order horns short enough to fit under the housing. I have the 48mm taper and the manifolds taper to 34mm since I have the smaller intake ports. Feel free to send me a PM (wink) if you have more questions.


Mike Bonkalski 01-31-2006 01:24 PM

I would leave the distributor with the stock curve until you get your fuel dialed in. Once that is done, lock the distributor and use the Megasquirt/MSD box to custom map your ignition.

alphie 01-31-2006 01:45 PM

Mike, what megasquirt are you using to control spark? Are you using MSI with MSnExtra or MSII? (and which PCB, 2.2 or 3.0?)

Mike Bonkalski 02-01-2006 05:52 AM

I used MSnSExtra on a MS-I v2.2 board with EDIS for my setup.

If I were to do it again, I would probably go with MS-II and use a locked distributor with an optical trigger or hall effect sensor to control spark. It's quite simple to wire up (2 wires - Sensor to MS-II and MS-II to the coil). It would keep the stock appearance and allow for full spark control.

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