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The mkiv Supra Owners Club

T88....what size injectors


JamieP

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Guest Terry S
wouldnt have a clue:) ......the car will be running on optimax and i just want to know what size injectors it should have:)

 

It does impact mate. Anyway I would say you are looking at leats 800-850cc.

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At 90% Duty cycle, to support 700bhp, with a brake specific fuel consumption of 0.6 (a rating of how much fuel is required to create 1 hp, 0.6 is the norm average for turbocharged cars) you'll need at least 816cc, Since I doubt very much that you'll be able to find 816cc injectors, I'd probably go for some 850's.

Similarly, if you would rather go for 80% duty cycle to be on the safe side you'll need slightly larger injectors, 918cc, I don't think 950cc injectors are readily available so you'll need to go for 1000cc.

Of course that is 700BHP at the flywheel (well truely speaking in my calcuations is atctually on the piston face, as no allowance for friction or other losses is included) If you want 700BHP at the wheels, then that's a different kettle of fish altogether!

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Guest Terry S
At 90% Duty cycle, to support 700bhp, with a brake specific fuel consumption of 0.6 (a rating of how much fuel is required to create 1 hp, 0.6 is the norm average for turbocharged cars) you'll need at least 816cc, Since I doubt very much that you'll be able to find 816cc injectors, I'd probably go for some 850's.

Similarly, if you would rather go for 80% duty cycle to be on the safe side you'll need slightly larger injectors, 918cc, I don't think 950cc injectors are readily available so you'll need to go for 1000cc.

Of course that is 700BHP at the flywheel (well truely speaking in my calcuations is atctually on the piston face, as no allowance for friction or other losses is included) If you want 700BHP at the wheels, then that's a different kettle of fish altogether!

 

Based on what static Tony

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Whatever pressue the injectors are flow tested at. As long as you run that static (and you should) then the injectors will flow the amount stated, hence the need for fuel pressure regualtors to keep the pressure across the injector the same (Didn't we do this before Terry? LOL) and then it's just a calculation of how much horsepower a certain amount of fuel will produce (which is the B.S.F.C. part)

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