MiKa Donating Members 4,243 Member For: 18y 7m 17d Gender: Male Location: Melbourne, VIC Posted 11/10/07 09:44 AM Share Posted 11/10/07 09:44 AM [quote name='Fatsex' post='583612' date='Oct 11 2007, 07:21 PM']OK I will correct you, I had calculated that at 4 bar fuel pressure and taking into account that the edit software will only let you run 80% duty cycle, its was around 400-410rwkw on an efficient engine.[/quote] Smart asss Link to comment Share on other sites More sharing options...
Headsex Donating Members 2,528 Member For: 19y 7m 27d Gender: Male Location: Melb Posted 11/10/07 11:28 AM Author Share Posted 11/10/07 11:28 AM (edited) i actually calculated these to be good for 450rwkw at one point... based on the fact that 42's run out at about 330rwkw, 60's should run out 450rwkw (caluclated 470rwkw.. but i'm being realistic here..) I dont think anybody has pushed these injectors upto the power level when they start noticing the AFR's starting to lean from commanded.. Edited 11/10/07 11:29 AM by Headsex Link to comment Share on other sites More sharing options...
Dagabond Bored Member Administrator 35,722 Member For: 22y 4m 24d Gender: Male Location: Dé·jà vu Posted 11/10/07 11:32 AM Share Posted 11/10/07 11:32 AM Do they improve with age..... Thread tidied up... Link to comment Share on other sites More sharing options...
SCRIBR Yaris member Member 4,486 Member For: 18y 9m 17d Gender: Male Posted 11/10/07 11:32 AM Share Posted 11/10/07 11:32 AM so in other words.. for 90% of people (even on this forum...) they are more than big enough! Link to comment Share on other sites More sharing options...
Fat-Tony Member 5,364 Member For: 19y 17d Posted 11/10/07 12:54 PM Share Posted 11/10/07 12:54 PM (edited) Here is some maths for calculating injector flow rates ect. Given the equation: IFR (lbs/hr) = (HP * BSFC) / (NI * 0.8) where: IFR = Injector flow rate HP = Engine horsepower BSFC = Brake Specific fuel consumption (pounds of fuel per hour / brake horsepower) NI = number of injectors The BSFC is determined from engine dyno tests and ranges from 0.4-0.6 for petrol engines therefore a BSFC of 0.5 is safe to assume for our purposes. Now the injector is rated at 60lbs/hr @ 3 bar fuel pressure or 83lbs/hr @ 4 bar (the XR6T runs 4bar), the BSFC is 0.5, and the number of injectors to be 6, we are then left with an equation we can transpose to find engine horsepower at 100% duty cycle. 83 = (HP x 0.5) / (6 * 0.8) 83 = (HP x 0.5) / (4.8) 398.4 = HP x 0.5 796.8 = HP 597.6kw taking into account that there will be about 25% drivetrain loss that brings us to a total of 448.2rwkw, so you were pretty close Danny Edited 11/10/07 01:00 PM by Fatsex Link to comment Share on other sites More sharing options...
AIM-300 SUPERLAP 2011 Member 158 Member For: 18y 14d Gender: Male Location: townsville Posted 11/10/07 01:06 PM Share Posted 11/10/07 01:06 PM (edited) so its safe to say with a good tuner with the right mods will see 400rwkw easy. in that case put me down for a set Edited 11/10/07 01:09 PM by AIM-300 Link to comment Share on other sites More sharing options...
Fat-Tony Member 5,364 Member For: 19y 17d Posted 11/10/07 01:08 PM Share Posted 11/10/07 01:08 PM (edited) [quote name='Fatsex' post='583612' date='Oct 11 2007, 07:21 PM']OK I will correct you, I had calculated that at 4 bar fuel pressure and taking into account that the edit software will only let you run 80% duty cycle, its was around 400-410rwkw on an efficient engine.[/quote] In the above equation (post #27) I actually have the value of the fuel pressure at 4 bar, in the calculation I made in this post here (which I did 3 months ago) my value for the injector flow rate at 4 bar incorrect, and the fact that edit will only let you command 80% duty is what I have been told, I am not 100% certain on this. Edited 11/10/07 01:15 PM by Fatsex Link to comment Share on other sites More sharing options...
shitbmxrider Donating Members 420 Member For: 19y 7d Gender: Male Location: Mill Park, Victoria Posted 12/10/07 01:49 AM Share Posted 12/10/07 01:49 AM wow. all that maths made my head hurt.(even moreso than my hungover-headache at 7am this morning) Link to comment Share on other sites More sharing options...
LUMO Donating Members 476 Member For: 18y 1m 24d Gender: Male Location: SYDNEY Posted 12/10/07 06:47 AM Share Posted 12/10/07 06:47 AM (edited) Put me down for a set of 6. When do i need to pay and i need them posted to Sydney. Cheers Pete Edited 12/10/07 06:51 AM by LUMO Link to comment Share on other sites More sharing options...
stukaoo2 Member 13 Member For: 17y 7m 23d Posted 12/10/07 07:05 AM Share Posted 12/10/07 07:05 AM First post... hi everyone. Put me down for a set as well. cheers Link to comment Share on other sites More sharing options...
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