High duty cycle isn't necessarily a bad thing.
High duty cycle isn't necessarily a bad thing. I'm sure when I spray it my injectors are locking open anyway.
Kurt
Its not about how it runs or feels OR guessing on the dyno. Go have it tested and then tell us.
It sure is when you're at maxed out levels.
Couldn't care less what it makes on a dyno. I tuned myself on the street via a PMS and a WBNice try though
No it isn't. Higher the duty cycle, the better the mixture. Kurt
I can say this about injectors and working them at and beyond the limit
when talking fuel pressure
Several years ago, a fellow who was a tech guy for Bosch used to hang
around on the various tuning sites
He basically said anything over the limit of pressure the inj was designed
for can alter the spray pattern
Several peeps challenged his info and he later posted a very in depth
tech white page kind of article showing just what he said was so
I used to have it but my old tuning laptop crashed and the file was lost
Now ... about duty cycle .......
Just look at Ford OEM applications such as
NA Stangs
Blown Stangs
Lightnings
Turbo T Birds
etc
I'd bet you won't find any of em running at 100% duty cycle
What is the reasoning many peeps seem to want to run an inj
at or beyond its limit
I feel that kind of thinking is a throw back from the old Fox body days
of mechanical fuel adjustment using AFPR's and mechanical spark
adjustment with dizzy twisting
Back in those days when you used 30's or larger ... (well, these days
too ... but, back then ... not that much pcm tuning was being done)
You usually had over rich issues at idle and cruise cause the pulse width
is quite small during those driving conditions and those big inj's spit
out too much fuel
These days with pcm optimization, you can easily deal with that
old time problem
Grady
"Butt dyno," = tuning the car based on how it feels in the seat of your pants vs. tuning it on a dyno.
This thing of running really big injectors is kind of a new thing. Back in the old days, for us old farts, we used to make do with nothing bigger than 30lbers. Anything bigger than that was so expensive, you just did without. I think the whole thing comes from the availability of larger injectors at cheaper prices. Theoretically, if the injector sprays for a longer period of time, then it mixes the fuel more evenly with the air, vs a larger injector that sprays for a shorter period of time. I think big injectors are overated. I mean, I've been making almost 600hp with the same 30lbers I've had for almost 10 years now. So, if they have made good power, and run fine for 10 years and 80,000+ miles, I don't see anything wrong with that. And I don't know how much the spray pattern changes, but I can definately say that I make good power with 95psi on the injector, so I don't see any reason to go bigger. So maybe going to be a bigger injector gives some people a sense of security, but I've seen enough small injector cars that work just fine.
Kurt
Paul, I have never understood your car. It seems to buck all kinds of rules, both internet opinion and legit math. If I had your setup it would have 36s (if I could find them) or 42s.
Adam
In a boosted car I will always go a bit the opposite way on my feelings about injectors though. Because so much more can go wrong, especially in a turbo car (ie boost creep/boost spike) I plan to put an injector on the car with a bit more 'wiggle" room if you will than what I feel comfortable doing with my NA stuff.
"Butt dyno," = tuning the car based on how it feels in the seat of your pants vs. tuning it on a dyno.
This thing of running really big injectors is kind of a new thing. Back in the old days, for us old farts, we used to make do with nothing bigger than 30lbers. Anything bigger than that was so expensive, you just did without. I think the whole thing comes from the availability of larger injectors at cheaper prices. Theoretically, if the injector sprays for a longer period of time, then it mixes the fuel more evenly with the air, vs a larger injector that sprays for a shorter period of time. I think big injectors are overated. I mean, I've been making almost 600hp with the same 30lbers I've had for almost 10 years now. So, if they have made good power, and run fine for 10 years and 80,000+ miles, I don't see anything wrong with that. And I don't know how much the spray pattern changes, but I can definately say that I make good power with 95psi on the injector, so I don't see any reason to go bigger. So maybe going to be a bigger injector gives some people a sense of security, but I've seen enough small injector cars that work just fine.
Kurt
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