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Old 12-10-2012, 08:06 AM   #31
Steel Chicken
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Quote:
Originally Posted by slimbobaggins...View Post
I'd like a tuner to tell me how you achieve 110% DC, when 100% is wide open. To you get the extra 10% from increased fuel pressure? IE, if your max injector flow rate is determined at say 50psi, and you're running them wide open at 55psi, theoretically you're pushing an extra 10% of fuel.

Is that the explanation? It's the only things that makes sense to uneducated me.

That's not what DC means.
1) its calculated, not actual.
2)Duty cycle is more than just flow rate, its flow rate over time. You don't have a lot of time to inject fuel when the engine is spinning at very high RPM. Once you run out of time (or injector capacity), you have hit the 100% DC mark. The injectors aren't actually injecting fuel past that point. 110% means the computer is telling you in order to meet the fuel demands, it would need ~10% more injector flow, or time, just to BARELY make requirements, which is why people aim for 80% -90% max on DC.
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Old 12-10-2012, 08:22 AM   #32
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How much time did DTP spend on your tune? Just curious seeing how Ed managed another 40 RWHP (doesn't surprise me).
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Old 12-10-2012, 08:51 AM   #33
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Different dyno and boosted cars take advantage of the correction factor, so if it was a warmer day there is your perceived extra HP.
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Old 12-10-2012, 09:18 AM   #34
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Forgot different dynos were used, I am dumb.
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Old 12-10-2012, 09:22 AM   #35
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Quote:
Originally Posted by Steel Chicken...View Post
That's not what DC means.
1) its calculated, not actual.
2)Duty cycle is more than just flow rate, its flow rate over time. You don't have a lot of time to inject fuel when the engine is spinning at very high RPM. Once you run out of time (or injector capacity), you have hit the 100% DC mark. The injectors aren't actually injecting fuel past that point. 110% means the computer is telling you in order to meet the fuel demands, it would need ~10% more injector flow, or time, just to BARELY make requirements, which is why people aim for 80% -90% max on DC.

I was thinking of duty cycle purely as the ratio of on to off, or open to close... as you said, out of time (full open) = 100%. I wasn't aware it was a calculated value, not real.
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Old 12-10-2012, 09:53 AM   #36
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Originally Posted by schmen...View Post
How much time did DTP spend on your tune? Just curious seeing how Ed managed another 40 RWHP (doesn't surprise me).

DTP never tuned it. I just put it on their dyno to see what it was putting down.
Ed's the only pro to touch it. The previous owner did the tune originally. I wanted it looked over for peace of mind and I'm glad I did. I coulda done some damage in the long run.
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Old 12-10-2012, 10:05 AM   #37
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Get a wideband on that beast so you can keep an eye on things (if you don't already).
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Old 12-10-2012, 10:11 AM   #38
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Originally Posted by ROLRACR...View Post
Usually a curve like that means the dyno or the tires are slipping.

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Old 12-10-2012, 10:27 AM   #39
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clutch

yep, which coincides with what Ed said.
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Old 12-10-2012, 11:31 AM   #40
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Originally Posted by mchicia1...View Post
Get a wideband on that beast so you can keep an eye on things (if you don't already).

A wide band is a MUST HAVE item on a F/I car
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Old 12-10-2012, 11:44 AM   #41
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Quote:
Originally Posted by slimbobaggins...View Post
I'd like a tuner to tell me how you achieve 110% DC, when 100% is wide open. To you get the extra 10% from increased fuel pressure? IE, if your max injector flow rate is determined at say 50psi, and you're running them wide open at 55psi, theoretically you're pushing an extra 10% of fuel.

Is that the explanation? It's the only things that makes sense to uneducated me.

duty cycle is the calculated fuel needed for a gien injector. When you have 110% duty cycle, it means the injector needs to be open for 110% of it's injection window, and since that can't actually happen, you go lean or you buy new injectors

remember, it's the percentage of time in the injection window, not the whole combustion cycle too, so no, its not a ratio of on to off :P
The injection window is, for obvious reasons, only there on the intake stroke, ideally when the valve is open
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Last edited by HunterKiller89; 12-10-2012 at 11:47 AM.
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Old 12-10-2012, 12:00 PM   #42
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Quote:
Originally Posted by schmen...View Post
Forgot different dynos were used, I am dumb.

You are not dumb.

different dyno's on different days can make a world of difference even with identical ambient temps and IATs and other conditions, another reason for different numbers is directly related to the dyno type. Some are loaded chassis dynos and some are not. My car has been on both machines and the non loaded type[ dyno Jet ] gave me a HP reading almost 60 HP higher than the loaded chassis type. The quality of the tune and how it runs is all I care about.

Last edited by JJD49; 12-21-2012 at 10:37 AM.
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