You can now select the pressure and the injector size required to match your build. This The police (caprice) ones have a higher lph then standard ones. 305ci 350ci (standard) 350ci (police interceptor) 454ci (operate at a much higher pressure like frankentoy stated) I'll try to find where I read that and report back. So proper pressure/injector sizing is the first step. In my research I read recently that there are only 4 different TBI injectors. But the injectors need to be able to flow enough fuel to support the HP output of the engine. With excellent power per volumetric flow, smooth mixture control, and a variety of models to suit any engine, the system is a must for any serious experimental pilot. Its unique fuel distribution system makes it easy to setup and operate. Taking a page from GM when they increased the fuel pressure on the late model 454 TBI from 12psi to 28psi and used a smaller (more common/cheaper) injector that provided better atomization of fuel, we can do the same with ours.Īny changes in pressure or injectors affects the flow and requires proper tuning. Home OEM TBI Fuel Injectors Set (2) 170843-1993 Chevy GMC 7.4L V8 399.95 This is a flow-matched set of 2 professionally remanufactured genuine OEM GM TBI fuel injectors. The Rotec TBI Fuel System, is the most compact and simple throttle body injector on the market. It is quite easy to calculate the new flow rate of an injector when adjusting the fuel pressure. To allow the system to keep up with modifications the stock TBI pump was replaced and the fuel pressure regulator or the injectors or both needed to be adjusted. #TBI INJECTOR SPECS FREE#Specify your choice of spring when ordering.Īs most know GM used an injector that was just enough to run a stock engine. Free Shipping - Estimated to ship direct from manufacturer on 11/25/22, pending manufacturer availability. Each TBI comes complete with injectors, TPS, air control valve, and throttle body bushings. High Performance/late model 454 28-34psi ~ This provides ~ 30psi in a stock regulator setting. The General Motors Rochester Throttle Body (TBI) is OEM original equipment. Performance15-20psi - This provides ~ 18psi in a stock regulator setting.ģ. This is a flow-matched set of 2 professionally remanufactured genuine OEM GM TBI fuel injectors. Stock replacement 11-14psi - This provides ~ 12psi in a stock regulator setting.Ģ. OEM TBI Fuel Injectors Set (2) 170843-1993 Chevy GMC 7.4L V8. Arrives by Fri, Oct 14 Buy Standard TJ11 Fuel Injector TBI Gas New, Standard at. I have narrowed down the options to 3 choices.ġ. I also was looking for options to make the system more tunable and support more HP than the stock injector settings. I have tested many springs in search of replacements for all the broken ones I have found.
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