GM Throttle Body (TBI) Regulator Spring (Performance) 15-20psi

Description: For 2 Barrel and Cross Fire Throttle Body I have tested many springs in search of replacements for all the broken ones I have found. I also was looking for options to make the system more tunable and support more HP than the stock injector settings. This auction is for the: Performance15-20psi spring - This provides ~ 18psi in a stock regulator setting. Pressure is tested in a factory regulator. I can not guarantee the same results when using an aftermarket regulator. I offer 3 different spring rates to cover the most common applications. Be aware....there is no "1" spring out there that can adjust from 11-40psi for a GM TBI. Springs are rated by their pressure for a given amount of compression. The GM regulator can only adjust about 3/8". So the range of adjustments is limited as shown in my spring choices. If compressed too far the spring will get coil bind and the pressure will spike to the full pump pressure. This is a bad thing. As most know GM used an injector that was just enough to run a stock engine. To allow the system to keep up with modifications the stock TBI pump was replaced(normally with a TPI or CPI pump) and the fuel pressure regulator or the injectors or both needed to be adjusted. It is quite easy to calculate the new flow rate of an injector when adjusting the fuel pressure. 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. Any changes in pressure or injectors affects the flow and requires proper tuning. But the injectors need to be able to flow enough fuel to support the HP output of the engine. So proper pressure/injector sizing is the first step. You can now select the pressure and the injector size required to match your build. Then data log and tune as required. If you have an early style regulator I can even show you a free/simple modification that allows it to be adjustable (as noted by the range of pressure for each spring). See my other auctions for more choices on springs. DO NOT order a higher pressure spring if you are not actively tuning. Bigger is not always better. The pressure has to match the engine and the injectors for each application. Hopefully this will help some of you other DIY guys! I specialize in EFI conversions for vehicles others don't. International Harvester, AMC/Jeep, Hudson, Studebaker, Stovebolts, Toyota, Suzuki, Mini, Triumph, MG...or your engine. Ask me about any thing you need for your TBI conversion, from parts to a complete Bolt-on system. HAMILTON FUEL INJECTION WE HONOR VETERANS

Price: 20 USD

Location: Oak Harbor, Washington

End Time: 2024-11-25T17:12:28.000Z

Shipping Cost: N/A USD