I am using a MS V3 with MSnS on a 258 jeep engine with a TBI etc. off a 4.3L 1990ish Jimmy. Though it runs much better than the carb, my pulse widths are too short to do a proper job of tuning. Pulse widths are typical 1.1 to 1.2 at idle with an opening time of 1 ms...doesn't leave much room for tuning with a system resolution of .1ms. I don't feel that reducing the fuel pressure will help much. I use a Hirobo exhaust gas analyzer system for tuning. I have MSnS set on 6 injection events per cycle simultaneous, it hates anything else.
I am very happy with my adapter plates, linkages and air cleaner installation etc. and don't want to abandon this TBI. The solution would be smaller flow rate injectors. I believe, however, that I have the lowest rate available.
Does anyone know of a lower flow rate injector that can be used in this throttle body ? or is there a high resolution MSnS code ?
Thank You
GM 4.3L TBI... do injectors smaller than 45lb/hr exist ?
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According to this chart:
http://thegebharts.com/msindex.html
There was a 33lb injector used on the 2.8L.
GM part number 5235430 - color code: Black/White.
http://thegebharts.com/msindex.html
There was a 33lb injector used on the 2.8L.
GM part number 5235430 - color code: Black/White.