Brad May Posted January 15, 2018 Report Share Posted January 15, 2018 Hi guys, can anyone offer any solutions to this? link Atom, LS1, 8 injectors on top of 6/71 blower, waste spark, semi sequential paired injectors. Cam have some overlap (not ideal for blower but sounds great) Have had a couple of tuners look at it, but its doing something really weird. Starts, run, idles. We start to tune the table then (seems to be as it gets hotter) the AFR leans right out (22:1), runs rough and stalls. It will start again, then a few moments later will do the same thing. When it does this it hasn't moved from its box on the fuel table. Fuel pressure remains constant (42psi) throughout. It seems this EFI on the roots blower might take some time to sort properly, so I may chuck a couple of carbs on tonight to get it ready for a holiday and revisit the EFI when I have more time. Any quick ideas? Quote Link to comment Share on other sites More sharing options...
Chris250 Posted January 15, 2018 Report Share Posted January 15, 2018 Are you running an IAT sensor? if so where? Quote Link to comment Share on other sites More sharing options...
Brad May Posted January 16, 2018 Author Report Share Posted January 16, 2018 Funny you ask that, its connected, but just hanging in the engine bay so sees some high temps, however I am sure it is currently disabled towards fuelling etc Quote Link to comment Share on other sites More sharing options...
Brad Burnett Posted January 16, 2018 Report Share Posted January 16, 2018 gonna need to see the calibration and a log of this to be able to better assist. Quote Link to comment Share on other sites More sharing options...
Brad May Posted January 16, 2018 Author Report Share Posted January 16, 2018 I thought you might. It's only a half hour job to set carbs up on it, so I may just do that tonight to eliminate the ignition side etc since time is not on my side Quote Link to comment Share on other sites More sharing options...
Brad May Posted January 16, 2018 Author Report Share Posted January 16, 2018 quick question someone may be able to answer, at idle it sits around -40kpa on the fuel table, someone thought this was really low vacuum? Mechanical gauge shows around 12" vacuum. Bear in mind cam has overlap. cheers Quote Link to comment Share on other sites More sharing options...
cj Posted January 16, 2018 Report Share Posted January 16, 2018 I take it your fuel table axis is MGP and not MAP? 12" vaccuum is about -40.5kpa so those 2 numbers line up as long as we're talking MGP. On a stock engine that's not much vacuum but with a big cam its probably in the ballpark. Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 16, 2018 Report Share Posted January 16, 2018 A map and log would be a good starting point so we can see if injector pulsewidth is changing etc. How to do the log: https://www.youtube.com/watch?v=_P1LRANeO4A What injectors do you have? Quote Link to comment Share on other sites More sharing options...
ClintBHP Posted January 16, 2018 Report Share Posted January 16, 2018 How big is the fuel tank, how hot is the fuel getting ? Quote Link to comment Share on other sites More sharing options...
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