I am programming in crome and came across a pretuned chip that claims to be a "greddy" turbo kit chip that is set for 8psi. I know its a fake, because I bought it on ebay. But my question is, will the settings on that chip work or will it burn my stock injectors out in a half hour? The duty cycle at 8000+ rpms is 124%! I didnt think it was good to go real high on the duty cycle % of the injectors, because it holds them open too long and can burn them out? Let alone go past 100%! Let me know ur thoughts!

 

No i dont believe so, % is in 0-100, it gives you the higher % b/c its not going to tell you get bigger injector

 

Also, use fuel tools and change the flow rate to say 550 or something depending on what you have know and notice how the duty cycle goes down.

 

Sorry about replying in a row so much, but things come slowly to me sometimes, lol. If run a program that has your d/c at more than 100% its not like your car will just shut down, but it'll hesitate a great deal, possibly some cutting out and such b/c the injectors just cant deliver and it may hurt them also.

 

anyone else? bump

 

You do not want to be running over a 90% duty cycle generally. Running the fuel injectors basically wide open all the time will burn them out and result in fuel cut and fuel cut under boost is bad bad bad. Usually this will lead to a popped motor.

 

How can you make injectors work 124% of the time?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by A_Rotary_Guy &raquo;</TD></TR><TR><TD CLASS="quote">You do not want to be running over a 90% duty cycle generally. Running the fuel injectors basically wide open all the time will burn them out and result in fuel cut and fuel cut under boost is bad bad bad. Usually this will lead to a popped motor.</TD></TR></TABLE>
exactlly, it's pretty much like running and T25 turbo to 30psi constantly. something is going to break.
z6hatchboy. u can just edit your post. there is a tab.

 

Simple answer? Get bigger injectors.

Stock 240cc injectors are good up to around 210whp, and they're close to being maxed out there. Bigger injectors means more room to grow, lower injector D/C, etc.

 

^correct. why would you skimp out on something so important as injectors? do you want to run your ish lean and blow it? just upgrade em

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ddd4114 &raquo;</TD></TR><TR><TD CLASS="quote">How can you make injectors work 124% of the time?</TD></TR></TABLE>

My thoughts exactly. Duty Cycle is a measurement of operation in a given span of time. Anything over 100% is irrelevant and is aiming you towards a blown up motor. Ditch the crack chip and get a crome/hondata/neptune.

 

Crome is never accurate with injector duty cycles. Whenever i tune with crome i just ignore it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by A_Rotary_Guy &raquo;</TD></TR><TR><TD CLASS="quote">You do not want to be running over a 90% duty cycle generally. Running the fuel injectors basically wide open all the time will burn them out and result in fuel cut and fuel cut under boost is bad bad bad. Usually this will lead to a popped motor.</TD></TR></TABLE>

+1, you generally want to avoid doing that, but if for some rediculous reason you absolutely have to, you can run your injectors over 100%.

 

boost on stock injectors is a bad move. (without raising fuel pressure) get larger injectors to do it right.
If you have a Z6 running 7psi you may be able to get away with upping the fuel pressure with the stock 240s. That's asuming you have a good fuel pump (walbro 190L/h is good) and the proper tune with the increased pressure. (get a wideband or tuner to do it right)

here is your answer on the DC question.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Luserkid &raquo;</TD></TR><TR><TD CLASS="quote">Crome is never accurate with injector duty cycles. Whenever i tune with crome i just ignore it. </TD></TR></TABLE>
I've seen 155% readings in Crome when the injectors are pulsing at 92.21%. (o-scope monitored)

Generally speaking you don't want to run injectors over 80% DC very long, they will start to heat up and will shorten their life span.

 

Simple answer, NO. Here is a simple explanation of injector duty cycle:

http://injector-rehab.com/kbse/idc.htm


For sizing, to get you in the ballpark on what size you should be running there are a bunch of other calculator on the same site (under charts) like these:
http://injector-rehab.com/imcw/
http://injector-rehab.com/issg/