Seadweller
I see the flow rates are different, so I would imagine changes to the ECU/eprom were required. I keep reading that the green injectors were "factory equipment on the 851," so was it the Tricolore that used the red injectors?
Inquiring minds want to know. 😉
MarkT
SP1- and I believe the LR and the Kit -were Black. I am not sure of the street Tri-color- perhaps also black.
The SP2, and SP3 red.
The SP4 I am not sure of- I just know that the FIM SP4 chip helps smooth out the tune of the SP2 and SP3. My guess is red-at least the early numbers.
The SPS and SP5 should be green since both had slightly detuned early Corse motors.
I welcome any corrections from owners since my only experience is with full Corse's and my SP2.
brad black
all dual injector 851 models use the black or red injectors. they flow the least, which is why they needed 5 bar in the corsa models.
all single injector 851 models use the green iw031 injectors.
the 888 models - well, not sure about the first 500 strada with the p7 ecu - were the first to use the built in iw724 injectors like all the later desmoquattro. both the strada single and the sp5 dual injectors.
brad black
having realised that the sp4 fiche i have calls it an 888, i shall revise my answer as below.
all dual injector pre 1993 models - 851 tricolore, 851 tricolore kit, 851sp2, 851sp3, 888sp4 - use the black or red injectors. they flow the least, which is why they needed 5 bar in the corsa models.
all single injector 851 models - 89-92 851, 89 851sp - use the green iw031 injectors.
the 1993 onwards models - well, not sure about the first 500 strada with the p7 ecu - were the first to use the built in iw724 injectors like all the later desmoquattro. both the 888 strada single and the 888sp5 dual injectors.
MarkT
Brad - why do you believe that the Corse's used black injectors with 5 bar fuel pressure.
Are you thinking of the Lucchinelli Replicas, and perhaps the Kit bikes which have black injectors so would most likely have 5 bar fuel pressure.
While these "Race bikes" were offered to customers- they were not very close to the factory Corse's which the factory team raced. For this reason, I do not put them into the Corse category. Pre mid-1990 Factory Works bikes were all hand made and used custom handmade frames. The LR and the Kit bikes used street frames. They were race bikes but were closer in weight and motor to enhanced street bikes.
I feel that the factory started offering race bikes after mid-90 which I feel were Corses because they were much closer in specifications to what the factory raced starting in the mid '90 season. - After mid-'90 the Factory Corse's and the Customer Racing bike started using similarly modified street frames. Customer Racing (Raymond Roche Replicas) and Factory Works bikes were basically the same aside from the Factory's use of Carbon and magnesium bits- and of course, the motors that Factory bikes used had way more internal trick bits with more hand polishing and lightening and bigger valves. The trick bits could be purchased if the factory wanted to provide the team support.
Every Corse I have owned or worked on, either post-mid-'90 Customer Racing or any Factory Works always had green injectors with 3 bar pressure. Even my '89 Factory Works Corse which Farne built has green injectors and 3 bar fuel pressure.
brad black
mark - you would know, so thanks for the info. i'm not surprised they used green injectors and 3 bar.
the "race notes" give the 5 bar info from memory, or am i making that up? either way, the red or black injectors don't flow enough for the production bikes, let alone more powerful race bikes.
MarkT
Brad- I agree about the 5 bar specification being often given as gospel for Corse's when I first started restoring them in the late '90s. It sort of was the common rule of thumb back then.
When I bought my first few sets of green injector Corse throttle bodies I expected to find that the fuel regulators were either marked 5 bar rather than 3 bar or that the lead plug had been removed indicating the screw was wicked up. They all tested out at 3 bar even the ones with the plug removed.
This is not to say that a race team never wicked up the fuel pressure due to the maps that they had available to them in the early years. My first track bike came with about 10 home-brewed chips that the team experimented with because the factory was stingy with sharing -- but I have never seen a factory bike using green injectors with more than a 3 bar regulator.
I have concluded that most Corse's use green injectors with the appropriate chip mapped to use 3 bar regulators.
Still--every time I locate someone who owns a factory bike, I always asked if they know what the fuel pressure regulator is on their bike.
But anything is possible and I have been wrong before.
