I'm depressed, 2 hours of dyno time for nut'n....., Ignition cr@pped out, wouldn't restart:( Options

[Mueller]

What a waste of a day off.... (IMG:http://www.914world.com/bbs2/html/emoticons/headbang.gif)

I knew it was going to be one of those days when my laptop wouldn't communicate with the Link ECU, luckly I brought a back up unit that I normally use, it's just that the 1st laptop I had was way, way faster...(normally)

Mark D (McMark) showed up and helped stomp on the gas while I played with the laptop, we started @ 1000rpm and went up in 500rpm increments...strange feeling with the pedal @ WOT in 4th gear and the motor would not go over the set load...

I kept hearing a misfire and then all of a sudden under load it got real bad, we changed out the distributor cap since the original one had some viewing holes cut into it for timing....it just got worse...then I noticed the air intake elbow was a little loose so I fixed that...I was hopeing that was it...nope still really bad misfires coming out of the exhaust....finally I load a new MAP setting and the car seemed to be idling better, then all of a sudden the car dies..."hey Mark, did you turn it off???"

"nope"

"oh $hit"

I get out the voltmeter, I have voltage like I should, no apperant spark....

So, it's one of the following I think (IMG:http://www.914world.com/bbs2/html/emoticons/wacko.gif)
a bad MSD box, a bad optical sensor in the dizzy or the Link is messed up....I have a check list of items to go over before sending the Link back for testing....

I think i want to replace the optical sensor within the dizzy with a hall effect unit, any leads or ideas?

McMark dyno's his car, I'll let him tell you about it...he had better luck than me

[Mueller]

QUOTE (airsix @ Nov 3 2005, 10:11 AM)

Mike, You had the link firing the coil before? I thought you were running the link fuel-only. If the link was firing the coil, where was the ECU getting it's timing signal from? Was it getting it from a pickup mounted in the distributor (like a pertronix or optical pickup?). If you were feeding a timing signal to the link via the distributor, is your distributor locked? The link would need to get it's timing signal at the same crank-angle regardless of rpm/load. An unlocked dizzy will change the angle at which the ECU get's it's signal depending on rpm/load and the ECU will calculate the wrong crank-possition. I know you know this - I'm currious how you were feeding the crank signal to the Link though. -Ben M.

optical sensor in Unilite(locked)>Link>MSD*>Coil

the Link needs to see the signal 10° BTDC, I modified the rotor as a half-@ss attempt of changing the relationship between the rotor electrode and the trigger windows of the rotor...I need to make them indepentant of each other

*MSD acts as an ignitor or coil driver, to me it's just an on/off switch to dump the voltage on the coil

aaron, I'm going to get rid of the optical sensor and replace it with a Hall effect unit, if it works as planned, I'll be selling the unilite sensor (sorta cheap (IMG:http://www.914world.com/bbs2/html/emoticons/smile.gif) )

Fiid,

I've been reading more on the MSv3, pretty cool, I should waited...oh well....


James,

I'll be looking more on msefi for info on that driver, on the surface it seems too simple to be able to completly replace the MSD, but if it could, that would be nice....