Gregd Posted June 24, 2018 Report Share Posted June 24, 2018 Hi there, I'm trying to get the timing right on this engine. The engine is from a '92 Corvette, ( now with a 55 Chev body on top.) It has a dissy with a high and low resolution outputs from it. Single coil and grouped injectors. Any ideas on the correct settings for this engine? Have tried Falling and Rising edge settings. And the different the different tooth settings. Still jumping all over the place. Looking for help on this matter to get it sorted. Thanks, Greg. Quote Link to comment Share on other sites More sharing options...
Adamw Posted June 24, 2018 Report Share Posted June 24, 2018 Hi Greg, An LS1 with a distributor is a new one on me... If you have one of our ECU's with a built-in triggerscope can you please do a triggerscope and attach it here. Here is a quick video how to do that: https://1drv.ms/v/s!AiYbYlZQuRHPmieMTkwQDCXEb2LY If you have one of our ECU's that dont have a scope (Atom or Monsoon), then a good place to start would be to give us a couple of photos of the inside of the distributor so we can see the sensors/toothed wheels. Quote Link to comment Share on other sites More sharing options...
Brad Burnett Posted June 25, 2018 Report Share Posted June 25, 2018 92 corvette would be LT1. And that is usually the optispark unit. There is a LT1 trigger mode in the software Quote Link to comment Share on other sites More sharing options...
Adamw Posted June 26, 2018 Report Share Posted June 26, 2018 I just googled Optispark, I had never heard of it. I expect it would work if you choose Nissan 360 Opto trigger mode and then run the "Test ECCS Sync" test. Quote Link to comment Share on other sites More sharing options...
Brad Burnett Posted June 26, 2018 Report Share Posted June 26, 2018 There is a ton of information right at everyones finger tips...…. From the help file Adamw 1 Quote Link to comment Share on other sites More sharing options...
Adamw Posted June 27, 2018 Report Share Posted June 27, 2018 19 hours ago, Brad Burnett said: There is a ton of information right at everyones finger tips...…. From the help file LOL, so it is. At least my guess was right... Quote Link to comment Share on other sites More sharing options...
Gregd Posted June 30, 2018 Author Report Share Posted June 30, 2018 The owner of the car is positive that he brought a corvette with a LS1 in it from the states as a doner car. Just did some research on the vin number. And it's looking like a LT1. He wanted a 300 plus hp motor but looks like he got the basic 300 when it was new. Will swap the ecu to the LT1 settings and see what happens. I'm stii learning about these wonderful engines. Quote Link to comment Share on other sites More sharing options...
Gregd Posted July 31, 2018 Author Report Share Posted July 31, 2018 Still having trouble getting this beast going. Found gummed up injectors, fouled spark plugs, poor connections to the injectors and last but not least a leaking water pump which is dropping onto the Optispark unit. Does anyone have a trigger pattern I could compare what I have verse what is a running engine. Tried to take a trigger scope capture have failed. Will try again. Trigger Scope Log 2018-07-29 12;48;19 pm.llg Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 31, 2018 Report Share Posted July 31, 2018 9 minutes ago, Gregd said: I took a scope shot of the triggers and, am wondering if it is producing a faulty pattern? Thinking it is.... No, that scope actually looks about right. Did you run the widest slot test? Do you get RPM displayed when cranking? Quote Link to comment Share on other sites More sharing options...
Gregd Posted July 31, 2018 Author Report Share Posted July 31, 2018 RPM reads from 146 to 240 ish when cranking. Carried out widest slot test on LT1 and Nissan settings. Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 31, 2018 Report Share Posted July 31, 2018 I would say that is working ok in that case. How many degrees it is showing in the widest slot setting? Do you have a spark now? Have you put a timing light on it and set base timing? Quote Link to comment Share on other sites More sharing options...
Gregd Posted July 31, 2018 Author Report Share Posted July 31, 2018 Widest slot setting comes up with 22 degrees, Spark and injectors. If you run the injector test for inj1 -2 you can get it to fire and try to run for a few seconds then nothing,,, fuel pressure good. Have marked the crankshaft pulley and checked timing, near 10 degrees. Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 31, 2018 Report Share Posted July 31, 2018 Sounds like maybe lack of fuel then. If you are using traditional mode try increasing the master fuel by say 50%. If you are using modelled mode a simple method to increase fuel is to increase the engine capacity setting. Or another quick test to confirm it is a lack of fuel is to add an alternative fuel source like a spray of ether or a squirt of petrol into the manifold. Quote Link to comment Share on other sites More sharing options...
Gregd Posted August 2, 2018 Author Report Share Posted August 2, 2018 Adam, I will give these a try tomorrow. Thanks. Greg. Quote Link to comment Share on other sites More sharing options...
Gregd Posted August 2, 2018 Author Report Share Posted August 2, 2018 Adam, you are a legend. Sometimes you can't see the wood for the trees. Awesome advice. The engine now runs after the 50% increase. Now a slight timing change and it will be purring even more. Thanks heaps. Greg. Quote Link to comment Share on other sites More sharing options...
Gregd Posted August 24, 2018 Author Report Share Posted August 24, 2018 Had this engine running for a little bit now. Running extremely rich. Tried cutting back the injectors and master fuel. Cutting back master fuel makes it run rough and idle fast. Injectors not making much difference. Is there something else I am missing? Had injectors serviced and refitted. Noticed right bank O2 not working correctly (after nine years of sitting around). Mechanic was going to replace. Aftermarket fuel pump fitted and using OEM regulator. Greg. Quote Link to comment Share on other sites More sharing options...
Adamw Posted August 24, 2018 Report Share Posted August 24, 2018 Do a short log and attach that and your tune file here. We'll start with that and see if there are any clues. https://www.youtube.com/watch?v=_P1LRANeO4A Quote Link to comment Share on other sites More sharing options...
Gregd Posted August 24, 2018 Author Report Share Posted August 24, 2018 I have emailed through a base data map and running log. Hope they worked. Greg. Quote Link to comment Share on other sites More sharing options...
Gregd Posted August 27, 2018 Author Report Share Posted August 27, 2018 Adam. The injectors are wired as per factory in two banks of 4. 1357 and 2468. Could easily change to individual feeds. O2 sensors are single wire OEM 92 corvette fitted to new pipes. Injectors are either 14 or 17 ohm OEM LT1 factory fitted. Serviced and reinstalled. I would have to recheck. Quote Link to comment Share on other sites More sharing options...
Adamw Posted August 27, 2018 Report Share Posted August 27, 2018 Did you do all the stuff I listed in the email I sent in the weekend - transient retard, base timing, master fuel etc? Quote Link to comment Share on other sites More sharing options...
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