Quick question...How much horsepower can 310cc injec. hold?
02-25-2002, 09:40 AM
#3
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Probably more than that....
My stock injectors are only 240, and they can support 200hp, probably not more than that though.
In order to get 200hp using 240cc/m according to the RCEng site, they run at 95% duty and 0.5 BSFC
Using those parameters, you're looking at about 260hp. Put in a 5-bar regulator, and you'll have about 290hp.
This should be considered an absolute max, and leaves no room for safety margins or upgrades. If you're still sizing injectors, and you're looking for these power levels (260-290) go bigger than 310cc.
In order to get 200hp using 240cc/m according to the RCEng site, they run at 95% duty and 0.5 BSFC
Using those parameters, you're looking at about 260hp. Put in a 5-bar regulator, and you'll have about 290hp.
This should be considered an absolute max, and leaves no room for safety margins or upgrades. If you're still sizing injectors, and you're looking for these power levels (260-290) go bigger than 310cc.
02-25-2002, 09:51 AM
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Well that's what Bosch says.
My injectors are rated at 290cc/min according to the 'source'. According to APR's flow test they flow 393cc@3bar. They also told me the stock FPR runs a constant 4bar.
02-25-2002, 10:39 AM
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Yes according to what I was told
APR flow tested them at 3bar and got 393cc/min. I'm not sure where the 290cc is from but my point was the 240cc rating you have might be wrong or tested at 2.5bar perhaps?
If you use 290cc and do the calculation there's no way the kit is making 280hp@4bar. More like 212hp which is definitely not true.
If you use 290cc and do the calculation there's no way the kit is making 280hp@4bar. More like 212hp which is definitely not true.
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02-25-2002, 11:46 AM
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Do you know what liquid they flow tested it with?
If they did it with something other than gas, it could be wrong.
I can see a 10% or so under-rating, but not 35%.
I'm also not sure I agree with RC Eng.'s equations. They are in business to sell injectors, and what better way to sell injectors than to convince you that the ones you have are too small.
I can see a 10% or so under-rating, but not 35%.
I'm also not sure I agree with RC Eng.'s equations. They are in business to sell injectors, and what better way to sell injectors than to convince you that the ones you have are too small.
02-25-2002, 11:56 AM
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Re: Do you know what liquid they flow tested it with?
If you do a search on the 02 chip controversy you'll find APR explained how they flow test the injectors. They have a pretty accurate flow tester and they use gasoline to test it. I think based on what they've done they'd know to use gasoline to flow test an injector =P. AFAIK RC's method is the industry standard to estimate HP ratings, the only difference I;ve seen are different BSFC being used. I used .6 since that's the most optimistic one used by RC for turbo cars. My injectors are maxed and if my calculation are right this pretty much corresponds to APR's claim of 280hp. + some from the test pipe.
You can probably give or take a few HP since we don't know what octane RC used. BSFC might be lower for higher octane gasoline.
You can probably give or take a few HP since we don't know what octane RC used. BSFC might be lower for higher octane gasoline.
