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100% Duty Cycle..

GreeceS13

By GreeceS13,
in Engines & Forced Induction

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GreeceS13 Rising Star

GreeceS13

Posted
Posted

I see at powerfc 100% duty cycle on my injectors..

Is it safe to run with this duty?

My injectors aren't small but I run them with very low fuel pressure... 1.5bar-22psi!

Is it ok to leave the injectors with theese duty? Or I must increase the fuel pressure and reduce the injector size (% from commander) ?

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Turbz RB-25 Experienced

Turbz RB-25

Posted
Posted

100%!!!

Get a FPR mate..... What you've done is VERY risky!!! THis means they cannot squirt any more fuel in. If it's a cold night, and your boost spikes, thus, taking in more air, your injectors won't be able to compensate for the extra air flow and some major detonation could occur.

I advise you get a FPR ASAP and take your car to your tunner!

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CEF11E Veteran

CEF11E

Posted
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all you have to do is run the rail pressure that you should normally use :P 43psi is standard. running a lower rail pressure will give you a poor spray pattern and bad atomisation.

as said above, readjust your fuel pressure to 43 psi and retune the car at that pressure level.

cheers!

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R31Nismoid Grand Master

R31Nismoid

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If I increase the fuel pressure at 43psi the car will be very rich...

So can I reduce the injectors size from commander and make the mixture as now?

Or it isn't the same the change of fuel press and the change of injectors size?

Well get it tuned - simple as that.

If you were hitting 100% during the tune, it should never have been done.

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GreeceS13 Rising Star

GreeceS13

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Because I don't have now a datalogit to tune it I asked if after I increase the fuel pressure at 43psi, to reduce the injectors size from commander! Can I make it to have the same afrs as now with some tests with this way? Or it is imposimble with this way to have the same afrs in all rpms?

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Brockas Proficient

Brockas

Posted
Posted

You don't want the same AFR's "in all RPM's".

It's clear you don't understand what it is you're doing, so put the hand controller down and take it to a reputable tuner. There is no logical reason to be running less than 43psi base pressure.

Road tuning with a wideband is acceptable, guessing is not.

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shotter Rising Star

shotter

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Without knowing exactly what your afr's are as your making the changes you could blowup your engine.

Plus even if you did make the changes and there was no knock you probably wont be getting the best out of the tune. Save your money, Keep the boost down and get it professionally tuned on a dyno.

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R31Nismoid Grand Master

R31Nismoid

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You don't want the same AFR's "in all RPM's".

It's clear you don't understand what it is you're doing, so put the hand controller down and take it to a reputable tuner. There is no logical reason to be running less than 43psi base pressure.

Road tuning with a wideband is acceptable, guessing is not.

He is actually from Greece or around that area with limited people to contact.

But from the beginning a few of us did warn that such a setup really needed closer attention.

Even if it means going to another country (europe isnt too bad at least), to get it all done... but ye - NFI why you would be choice, drop the rail pressure @ base.

Some people don't know what they are doing and the unfortunate outcome could be a minced motor

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GreeceS13 Rising Star

GreeceS13

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Guys I know what I am doing!!

When I said the same afr in all rpms I mean.... The same afrs in all rpms that I have know.... e.g. at 14.7 idle... but also at wot 10.8... etc!!!!

So I ask if with droping the injectors and increase the fuel pressure if I will have the same afrs..

And I ask this because if I change the injectors the differences are linear to all the map..

But I think fuel pressure changes don't make linear changes at the map.

I will put 43psi fuel pressure and changing the injectors I can have 10.8 again wots... but at this point all the other will be ok? Cruising... idle... ?

I hope that now you understand what I am saying...

I have so low fuel pressure because I didn't have a good gauge when I tunned the car. I imagine that I had 3.5bar fuel pressure but from mistake I had 1.5bar!

Also in my country we aren't so bad as you thinking...

Fastest EVO in europe 9.0sec

Highest hp EVO in the WORLD 1416hp (2007 and still working)

And many other good cars.

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JonnoHR31 Grand Master

JonnoHR31

Posted
Posted

set your fuel pressure to 43psi. the injector settings should be set to match the injectors, eg stockers should be 100% and 0 correction. then change the fuel map to get the afr's right. start rich go from there. if you dont know what your doing, dont touch it

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GreeceS13 Rising Star

GreeceS13

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I adjust the fuel pressure at 43psi-3bar.

I change the fuel map and not with 10.5 wot I have 99% open the injectors!

Max exhaust temp 1300F-700C.

100oct with 15deg ignition from 6000 to 8000rpm

But I check after some driving the exhaust temp and it was peak 1800F-1000C!!!

I don't know why :) All the time I was looking the wideband and nothing was wrong.

Full thottle from 3000 to 5000 was aroung 13.. then 10!

When the car has high EGT? If it has low ign or high?

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Guilt-Toy Grand Master

Guilt-Toy

Posted
Posted
I adjust the fuel pressure at 43psi-3bar.

I change the fuel map and not with 10.5 wot I have 99% open the injectors!

Max exhaust temp 1300F-700C.

100oct with 15deg ignition from 6000 to 8000rpm

But I check after some driving the exhaust temp and it was peak 1800F-1000C!!!

I don't know why :) All the time I was looking the wideband and nothing was wrong.

Full thottle from 3000 to 5000 was aroung 13.. then 10!

When the car has high EGT? If it has low ign or high?

You need to re-tune the car. I am moving to Eastern Europe in a few weeks if you pay for my flight and accomodation I will tune it for you for free, which shouldnt be too much because I am moving close by, or you bring the car to me and I can dyno it properly for you.

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