Injectors
07 Oct 2021

"1130 fuel injector follow up" Posted by steven.p - Benelliforum - 4 Jul 2010
steven.p has found that the stalling problem was eradicated when his 1130 injectors were changed to an alternative Denso 25326903 (Alternative 1 below) by Powerflow in Scoresby, Victoria

steven.p's Explanation
"Let me restate that the reason why the original injectors are not the best for the bike is because of the spray pattern and atomization at low rpm, not that they are faulty. The spray pattern does not work well given the angle of the injector and intake port and valve. It causes a dribble effect along the wall of the intake and a puddle around one of the intake valves causing misfiring and as a result that terrible stall issue as you approach a set of lights or roundabout. It also creates the hunting idle. I sent jamesobrady a short vid of my bike and he agrees that it idles extremely smoothly!"

A search revealed the following:- (posted on the Benelliforum 15 Jul 2011) The Denso 25326903 uses an USCAR connector (USCAR/EV6), instead of EV1/Bosch/AMP Timer, but there is a EV6 female to EV1 male converter available. Google "uscar to ev1 connector" or "ev1 to ev6 fuel injector Plug Adapter" if the following links are broken.
FiveO Motorsport
ebay
Laurencewhite's "Fuel Injectors Group Buy"

	OEM		Alternative 1		Alternative 2
Cross References
	Johnson Controls Inc.	U9122-357	Denso	25326903	Denso	297500-0940
			Denso	FJ502	Nissan	16600-JA00A
			AC Delco	217-1517	Airtex	4G2176
			AC Delco	217-1626	Autoline	16-2074
			GM	12580426	Bostech	MP4280
			GM	25326903	BWD	67625
			Standard (SMP)	FJ502	GB Reman	842-12342
			Airtex	4G1917	GP Sorensen	800-2053N
Specifications
Injector type	Saturated
Resistance (Ohms)	12
Time to Open (ms)	36
Flow Rate (cc/min @ 3 Bar)	328		384		308
Theoretical Power @ 80% duty cycle (hp)	150		176		141
Overall length (mm)	63
O-ring to o-ring (mm)	52
Diameter (mm)	15
O-ring diameter (mm)	14 top, bottom
O-ring	Viton
Spray nozzle	4-hole 144 degree arc		4-hole disc		12-hole disc
Spray pattern			Narrow cone
Fuel Types	Flex (ie. all types of gasoline, E10, E85)
Electrical connection	Bosch 2 pin Junior Timer		USCAR EV6		Sumitomo EV14 (a.k.a. Japanese High Guide)
Used In:-	900 Tornado (+RS), TNT 1130		02-07 GM Silverado, Avalanche, Yukon, Tahoe, Suburban 5.3L Flex Fuel		Nissan: 2.5L 4 cyl QR25DE; 3.5L V6 VQ35HR

Bear in mind, compared to the OEM part, the alternative injectors shown above have a different Flow Rate and presumably, Time to Open, and as such, will require a change to the map and idle settings, assuming of course that the OEM map is perfect - which we know it is not.

A higher flow rate would require shorter "on" times and could conceivably make idle durations so short that the ECU could have difficulty maintaining accuracy.
Conversely, a lower flow rate would require longer "on" times, which could limit maximum power if 100% duty cycle is reached, but if the Theoretical Power is above the actual power (130 hp for the Tornado 900 Tre) this should not be an issue. On the bright side, the idle times would be longer for a lower flow rate part, improving ECU accuracy.

Engenia has used Alternative 1 for 10's of thousands of kilometers successfully.

It didn't solve the stalling problem on his 900 Tre.
The jury is out as to it's efficacy on a 900

Alternative 2 is about to be tested (October 2021). It's flow rate is lower and atomisation is much finer, which should improve combustion at idle and higher.

For both parts, and indeed the OEM, the Motty AFR Tuner installed on Nell automatically adjusted the maps given desired AFR and feedback from an Oxygen sensor, so no ECU map changes were required.