Question on injector sizing YSI+LS2+E85
Thread Starter
Racer
Joined: Oct 2013
Posts: 280
Likes: 21
From: Dayton Ohio
Question on injector sizing YSI+LS2+E85
What size injectors are some of you running with E85 and a YSI? I have a 402 CI motor, 10:1 compression with ID1300's making about 18 PSI. Injector duty cycle is reading 130% at redline, 100% by 5700. Car isn't running lean.
Last edited by ESSFO; Jul 27, 2018 at 09:28 AM.
Burning Brakes
Joined: Oct 2005
Posts: 1,089
Likes: 82
From: Kauhava, Finland
Must be because of double stoich / half IFR scaling setup?
Last edited by Pekka_Perkeles; Jul 28, 2018 at 04:57 AM.
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Race Director
Joined: May 2004
Posts: 16,667
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From: Raleigh, NC
St. Jude Donor '15
Can someone elaborate on why injector DC would be wrong? Or am I misunderstanding what was said?
Seems like the math behind that is pretty simple, just inj PW / inj window basically
Seems like the math behind that is pretty simple, just inj PW / inj window basically
Team Owner
Joined: Nov 2007
Posts: 24,035
Likes: 2,342
From: Gilbert AZ
I maybe way off but when you have 1000+ and stock ecu only supports 60lb on tables you lie on the size as you know by doing half if or more .in this case has to be more than half.
My car would always show 140-160% duty cycle, so ovvisobvi that isn't possible. Always figured it was off from the in accurate ifr tables.
My car would always show 140-160% duty cycle, so ovvisobvi that isn't possible. Always figured it was off from the in accurate ifr tables.
Race Director
Joined: May 2004
Posts: 16,667
Likes: 1,209
From: Raleigh, NC
St. Jude Donor '15
Weird stuff for sure.. since it just uses inj PW in the calculations, which should be after all the other math that uses airflow/AFR/inj flow rate, etc. is used to calculate it, I didn't think IFR would make the calculations wrong. But there's probably more going on in the background of calculating IPW than I know or something that is screwing up the #'s.
Oh well, whatever works
Oh well, whatever works
Last edited by schpenxel; Jul 30, 2018 at 11:05 AM.