What does it take to get big injectors to run properly at low rpm on a mild set-up? svo 30#-220$ Frp's,msd,holley,svo42#,delphi,ect,ect-300$-450+.Is the differnce just a supply and demand thing? Or are the more expensive ones better?(more versitile). I've heard it said "there is no down side to running big injectors anymore". I need to know if this pertains to all(cheap svo's,delphi,ect.)or only the high priced ones.

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95 Z28 XE 218/230 cam,Davis step headers,Total Engine Air Flow Heads,& 150 dry shot.

 

As far as I know there are only two manufacturers of injectors Bosch & Lucas. Everybody else just puts there name on them. I'm running the 36# SVO's and have no problem idling. You need to change the offset and constant tables and it should run fine.

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94 Z28,M6,355ci,9.5 CR Vortech S-Trim w/Aftercooler,Tunercat Prog.,DIY Vented Opti, Forged Internals,Port.&Pol. Heads w/3 angle grind,Bal.&Blue.,Crane 215/224-532/532-112LSA cam, 1.6 RR & Crane HI-6R Ignition ,36# SVO Inj.,Magnecor Plug wires,Edelbrock Shorty Headers with Flowmaster,High Flow Cat,BBK 58mm TB ,K&N CAI,Luk Clutch,Eibach Pro-Kit w/Panhard Rod ,Global West SFC's,RK Sports 5-way adj. shocks & LCA's, Slotted Rotors, Auburn Posi w/Motive 3.73,ETC.

 

GM makes their own injectors (Rochester Products), and I believe Siemans is independantly produced - could be wrong on that one though.

The key issue in low rpm and idle operataion is achieving a low pulse width. Within the selection of high impedance injectors available, the "disc" type produced by Lucas is the fastest, followed by the RP's, with Bosch (aka Denso, Ford, SVO) being the slowest. When you get to really large injectors, you typically start looking at "peak and hold" (low impedance) injectors, which operate much faster than a "saturated" (high impedance) design, and can achieve lower pulse widths. It is the peak and hold design, plus the high current, high resolution drivers in the aftermarket computers that allow the use of very large injectors, without problems at idle and low rpm.

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Fred
94 Formula A3+1: 381/TH400+OD/N2O

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11.513@115.59 on motor; 11.162@127.67, 1.643 60' on a 125-shot. Going with a 275-shot this year