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Message: <blockquote data-quote="geoff" data-source="post: 34312" data-attributes="member: 245">I dont like the sds for a few reasons.  First whats good with it -Cake to installEasy to change values <albeit somewhat blindly changing them>affordableGREAT first efi systemWhat i dont like -no wideband o2 sensorno dataloggingno autotunefair resolution of fuel / ignnition mapping, but a PAIN with only a handheld unitIf this is meant for a race truck, i think its basically going to a gunfight with a box cutter.  If you have an engine that will be running at extremes for long periods (i cant think of a better example than desert racing) I do not feel this system will be able to provide a perfect mixture for your engine.  The lack of a true wideband o2 sensor means that you will not be able to get an EXACT idea of your air fuel ratios.  5 wire o2 sensors are commonplace on modern standalone systems, and they also have the Autotune option. Say at WOT and low vacuum levels you want an a/f ratio of 13.2.  While racing, for whatever the reason, your engine is running at 14.4.  As a result you are running lean, getting high EGTs, less power etc, although it may not be very noticeable, the engine is getting beat up.  A system like SDS keeps the ratios at a lean-ish 14.4 whereas with a more modern system it will automatically change the values until the wideband o2 reads 13.2.  It will automatically do thisDatalogging is extremely important becuase you will know exactly how well all the components of the engine are working.  What maps you hit at what rpm, what the water temp was, what the throttle position was when it happened to break up?  When you are trouble shooting nothing is more important than real datalogging.  The resolution is an issue becuase you can not physically see the fuel map or ignition timing curve map.  When you can see the maps physically it is much easier to picture the advance./retard or fuel enrichment trends the engine will follow.Overall i feel the SDS is lacking.  If you want a simple as can be system it may work.  However i know a guy who ran one on a toyota with a supra motor and did about 550whp in a setup that should have done around 800.  There could be a number of factors contributing to this lowish number, but i would like to at least know it *wasnt* the efi, and thats not something i can be sure of.  On a race truck, take the time to research and if you need talk to a number of other people using the standalones.  I can get you in touch with anyone on any of the systems and i can get the stuff at my cost if you need, just let me know.  Talk to you later"We are the music makers, and we are the dreamers of the dreams."  -- Willy Wonka</blockquote>

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