SD_Targa

Hello, I recently discovered the advance curve on my distributor was completely off due to some aftermarket springs. To make my testing / diagnosis easier I swapped out my CDI+ box for the original Bosch unit in order to use the dial-back feature of my timing light to accurately map the curve in situ. Is there any way to adjust the CDI+ box to either eliminate the second spark or make it work with a dial back light? I just got my distributor back from a rebuilder and want to confirm the curve. It would be nice to not have to swap between boxes. The CDI+ box was so nice to use during troubleshooting. I was getting small exhaust after fires in the midrange at light throttle and I've chased my tail replacing every fuel and ignition component. I finally realized my distributor was giving full advance (32*+) by 2500 RPM. After using a dial-back timing light to plot my curve throughout the entire range, I was able to create an overlay to pull out timing in all the right places to basically bring it back into spec. All the exhaust after fires disappeared and it finally ran the way it should. I'm so glad I invested in the CDI+ box!

Hello, I have been driving my tachometer off the distributor in my 1974 911 with a 3-pin CDI+. My tach started to act up with some minor bouncing the other day. I decided to check the points trigger signal to the CDI+ with my Picoscope and noticed it has an 8v square wave signal to the box and tach. Is this the normal signal for a 3-pin CDI+? I always thought the later tachs need an 11+ volt signal. Any input would be helpful!

Hello, I recently purchased a CDI+ unit for my 1974 911 Targa from the folks at Pelican Parts. I have been chasing a small exhaust backfire and low RPM bucking/stumbling issue for several months and bought the CDI+ hoping that it would cure my issue. My original Bosch CDI unit was putting out about 150v at idle (measured with a direct voltage adapter) so I figured it was time for a replacement. Unfortunately, it did not cure my issue, however, the engine has a different tune to it at idle (sounds stronger) and under high load and WOT it absolutely screams! It feels like a completely different engine with the CDI+. I couldn't be happier. I finally bit the bullet and pulled my CIS and found a severely cracked and leaky air box. A replacement box (and other bits) are in the mail, and I can't wait to finally get my issues resolved. Thanks for putting together such a modern and elegant product! I am curious to find out more about some of the features available in the CDI+ software such as: tachometer smoothing, adaptive multi-spark and distributor input smoothing. I recently had my tachometer rebuilt by NHS but it still swings around more than I care for especially with high RPM shifts. I'm told this is normal and due to the large dial and the design of the internal movement. I am going to hook up the CDI+ to drive my tach and I'm wondering if the tachometer smoothing feature might settle my tachometer down a bit. Any details on these features would be greatly appreciated.