10399U, 10399M, Fiveo Peak & Hold; Flow Rates Up to 2000cc

Part Number: 10399U: Peak & Hold - Varied Flow Rates Up to 2000cc
High Performance
  • 13 - Flow rates from 450cc up to 2000cc - Easy Installation - Plug & Play

List price includes: One (1) fuel injector - Matched sets available with individual fuel injector data

FIVEOMOTORSPORT FUEL INJECTORS are custom-manufactured in small-quantity batches to achieve the highest quality product. Our injectors are all-fuels rated; including gasoline (MTBE), and E-85. The finished injectors are then flowed and inscribed with a control number. Data is recorded for each injector. The fuel injectors are then grouped into matched sets ready for shipping.

FLOW CHART: Each set is sold with a complete and unique flow-data chart indicating individual static flow rates at 3.0, 3.5, and 4.0 BAR. As well as 3.0 BAR dynamic pulse testing for idle (15% duty-cycle) and 50% duty-cycle. Along with a complete dead time off-set (latency) table. Flow matching was done with industry-standard equipment of the highest quality.
The tests were performed at varying temperatures to achieve realistic results. Linear tuning with excellent low-end, and idle rpm.
Fiveo is the only fuel injector seller that can claim this level of technology.

E85 Fuel usage - Because of the high-H2O levels, ethanol will not rust but tends to "dry" the orifices in stainless-steel constructed fuel injectors. Customers should be aware that this can be a problem with some fuel injectors and may cause a "sticking" problem. Periodic lubrication is recommended for any engine that will be left without starting/running for extended periods - weeks to months - at a time.


  • This injector will function at rail pressures in excess of 116 PSI, 8 bar.
  • Excellent low pulse width response with predictable response down to 2ms.
  • Excellent atomization for modern multi-valve engines
  • This set will require no more than a 1% trim for easy tuning
  • Injector type: EV1, Jetronic
  • Application: Offroad and racing, naturally- and forced-aspirated engines


Fuel Injector Specifications:

Type: Peak and Hold

Fuel Delivery: Single Pintle

Electrical Connector: EV1, Jetronic

Spray type: Wide cone, excellent atomization

Installation Length: 64 mm

Overall Length: 74 mm

Diameter: 24 mm

O-rings: Viton Rubber, 14.5 mm OD

Resistance: 2.7 Ohms

Amperage: 4.5 amps

Fuel types: Gasoline, Methanol, E85, E25, E10, E100


More Information
Manufacturer Fiveomotorsport
OEM or Aftermarket High Performance
Part Number 10399U: Peak & Hold - Varied Flow Rates Up to 2000cc
Year(s) 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998
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