1300cc injectors and duty cycles
06-09-03, 10:56 AM
#1
Eats, Sleeps, Dreams Rotary
Thread Starter
1300cc injectors and duty cycles
I am consistantly seeing a peek duty cycle of 80.XX% at 15 psi. KD has me tuned to a mid 11 AFR.
Isnt that a high injector duty cycle given that i am running 1300cc. What are those of you who ar running 1300cc injs seeing for a peek? Please list boost and duty.
Thanks.
Isnt that a high injector duty cycle given that i am running 1300cc. What are those of you who ar running 1300cc injs seeing for a peek? Please list boost and duty.
Thanks.
06-09-03, 02:04 PM
#2
You can play with the numbers here, but be aware that the BSFC, fuel pressure, drivetrain losses, etc. can change the numbers a fair amount. Some of these are difficult to estimate accurately.
http://www.maxcooper.com/rx7/how-to/...tem/calcs.html
-Max
http://www.maxcooper.com/rx7/how-to/...tem/calcs.html
-Max
Last edited by maxcooper; 06-09-03 at 02:07 PM.
06-09-03, 02:16 PM
#3
Eats, Sleeps, Dreams Rotary
Thread Starter
i was just curious as to what other people are seeing...i thought i read some people saying they were seeing 50% duty at 15 psi....thats way different.
06-09-03, 02:30 PM
#5
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Matty, you added approx 25% more fuel than stock with the 1300s. Stock injectors will be at 100% duty cycle at 15 psi so your 80% seems right on. I don't know who was running 50% duty cycle at 15 psi with 1300s and, unless they have raised the fuel pressure significantly, they won't be running it for long.
06-09-03, 02:34 PM
#6
Eats, Sleeps, Dreams Rotary
Thread Starter
Originally posted by Marshall
Matty, you added approx 25% more fuel than stock with the 1300s. Stock injectors will be at 100% duty cycle at 15 psi so your 80% seems right on. I don't know who was running 50% duty cycle at 15 psi with 1300s and, unless they have raised the fuel pressure significantly, they won't be running it for long.
Matty, you added approx 25% more fuel than stock with the 1300s. Stock injectors will be at 100% duty cycle at 15 psi so your 80% seems right on. I don't know who was running 50% duty cycle at 15 psi with 1300s and, unless they have raised the fuel pressure significantly, they won't be running it for long.
i thought the 1300cc are ~60% bigger...i went from 850s..no?
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06-09-03, 06:28 PM
#9
Eats, Sleeps, Dreams Rotary
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Originally posted by Tim Benton
good answer Marshall....whoever was claiming 50% at 15 psi will be posted questions about a rebuild soon. 80% sounds about right.
Tim
good answer Marshall....whoever was claiming 50% at 15 psi will be posted questions about a rebuild soon. 80% sounds about right.
Tim
06-09-03, 09:01 PM
#10
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Re: 1300cc injectors and duty cycles
Originally posted by matty
I am consistantly seeing a peek duty cycle of 80.XX% at 15 psi. KD has me tuned to a mid 11 AFR.
Isnt that a high injector duty cycle given that i am running 1300cc. What are those of you who ar running 1300cc injs seeing for a peek? Please list boost and duty.
Thanks.
I am consistantly seeing a peek duty cycle of 80.XX% at 15 psi. KD has me tuned to a mid 11 AFR.
Isnt that a high injector duty cycle given that i am running 1300cc. What are those of you who ar running 1300cc injs seeing for a peek? Please list boost and duty.
Thanks.
Generally I never see the 80's and I run around 14.5 psi regularly.
David
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