How much whp w my injectors
#1
Rotary Enthusiast
Thread Starter
How much whp w my injectors
Deciding between
1000cc pri + 1680 + 720 2ndaries.
Or
1000 pri + 1680 + 2000 2ndaries
I'm not looking for more than 600whp. I have enough turbo and fuel system etc.
Thanks.
Chris
1000cc pri + 1680 + 720 2ndaries.
Or
1000 pri + 1680 + 2000 2ndaries
I'm not looking for more than 600whp. I have enough turbo and fuel system etc.
Thanks.
Chris
#5
Rotary Enthusiast
Thread Starter
I dont have 6 1000cc injectors. I have the first comination of 6 injectors i posted. I want to know if that combination is enough for up to 600whp or if i will have to swap the 720s for 2000s. Does anyone know the math for a rotary on e85?
Thanks
Chris
Thanks
Chris
#7
Racing Rotary Since 1983
iTrader: (6)
"Does anyone know the math for a rotary on e85?"
it takes 145,537 BTUs to make 600 at 10.0 to one AFR
E85 contains 80,767 BTUs per gallon (assumes 83% eth, 15% gas, 2% filler)
you need 9200 CC/min of E85 nominal (gross) to get 6800 CC/Min into the engine to make 600.
9200 X .85 (max inj duty cycle) X .87 (lag) = 6800
this capacity allows you to run 10.0 to 1
you can make 600 w a bit less if you run leaner than 10 AFR or raise your rail pressure. it is good to be able to tune rich if you need and also to have some reserve for pressure loss.
howard
it takes 145,537 BTUs to make 600 at 10.0 to one AFR
E85 contains 80,767 BTUs per gallon (assumes 83% eth, 15% gas, 2% filler)
you need 9200 CC/min of E85 nominal (gross) to get 6800 CC/Min into the engine to make 600.
9200 X .85 (max inj duty cycle) X .87 (lag) = 6800
this capacity allows you to run 10.0 to 1
you can make 600 w a bit less if you run leaner than 10 AFR or raise your rail pressure. it is good to be able to tune rich if you need and also to have some reserve for pressure loss.
howard
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#9
Rotary Enthusiast
Thread Starter
Thanks Howard/RXTASY. I decided to use the 2000cc injectors instead of the 720cc. As it sits now I have 1000cc primaries, and 1680+2000cc 2ndaries per rotor or 9360cc of total injection for the engine. Its probably safe to assume that I will not need another upgrade, ever...lol
Cheers!
Chris
Cheers!
Chris
#14
#15
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running two 1600s for primary, four 1600s secondary with two 1000s secondary. Fuel pressure above 45psi key on engine off.
9000 rpms = 6 ms under full load. 11.5 afr. No power difference from low 11s afr to high 11s afr
151mph in the 1/4 mile, 2650lbs with me. No dyno numbers
Just to give you a idea.
recently replaced the 1000s with 1800s. Now the power can be turned up.
Everyone talks about 30% more fuel is needed when going E85. seeing more in the 35/40% range.
9000 rpms = 6 ms under full load. 11.5 afr. No power difference from low 11s afr to high 11s afr
151mph in the 1/4 mile, 2650lbs with me. No dyno numbers
Just to give you a idea.
recently replaced the 1000s with 1800s. Now the power can be turned up.
Everyone talks about 30% more fuel is needed when going E85. seeing more in the 35/40% range.
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