You looked for boost leaks or you pressurized the intake to eliminate boost leaks?
Stock fuel pressure?
Stock fuel pressure?
Help me with my 550s
Ok so I have been having a problem with overrunning my injectors. Boost was like 18-20 and I was getting 105 to 150 duty cycle. So I turn the boost down to 10psi and Im still getting up to 109%.
How could I be getting such high duty cycle on such a low amount of boost?
I have looked for boost leaks ect ect.
How could I be getting such high duty cycle on such a low amount of boost?
I have looked for boost leaks ect ect.
1 - 20 of 23 Posts
What happens when you overrun your injectors?
How did you look for leaks? I take it you are not using a FPR?jr91gsx said:Ok so I have been having a problem with overrunning my injectors. Boost was like 18-20 and I was getting 105 to 150 duty cycle. So I turn the boost down to 10psi and Im still getting up to 109%.
How could I be getting such high duty cycle on such a low amount of boost?
I have looked for boost leaks ect ect.
Take care,
David
Base fuel pressure is about 43 with the vac off and 37 to 38 with it on.
I found a small leak and fixed that. I also pulled off the injectors and found two small tears in 2 of the o-rings. So I replaced all the o-rings and went for a ride. Here is a third gear log on about 14 psi with 5 gallons of 100 oct. Fuel filter is new.
Rpms knock Airflow inj/dc
2187 0 333 10
2562 0 529 20
2625 0 567 21
3250 0 774 32
3750 0 907 39
4062 1 1058 46
4312 0 1159 52
4531 0 1348 61
5093 0 1606 82
5375 1 1606 94
5718 0 1606 100
5875 6 1606 101
6218 12 1606 104
6562 17 1606 107
6906 17 1606 107
7093 17 1606 50
I have my wot zeroed out. Should I try leaning it out to see if im just running rich?
I found a small leak and fixed that. I also pulled off the injectors and found two small tears in 2 of the o-rings. So I replaced all the o-rings and went for a ride. Here is a third gear log on about 14 psi with 5 gallons of 100 oct. Fuel filter is new.
Rpms knock Airflow inj/dc
2187 0 333 10
2562 0 529 20
2625 0 567 21
3250 0 774 32
3750 0 907 39
4062 1 1058 46
4312 0 1159 52
4531 0 1348 61
5093 0 1606 82
5375 1 1606 94
5718 0 1606 100
5875 6 1606 101
6218 12 1606 104
6562 17 1606 107
6906 17 1606 107
7093 17 1606 50
I have my wot zeroed out. Should I try leaning it out to see if im just running rich?
Whats your timing/egt's doing through all of this? That will help diagnose the problem.jr91gsx said:Base fuel pressure is about 43 with the vac off and 37 to 38 with it on.
I found a small leak and fixed that. I also pulled off the injectors and found two small tears in 2 of the o-rings. So I replaced all the o-rings and went for a ride. Here is a third gear log on about 14 psi with 5 gallons of 100 oct. Fuel filter is new.
Rpms knock Airflow inj/dc
2187 0 333 10
2562 0 529 20
2625 0 567 21
3250 0 774 32
3750 0 907 39
4062 1 1058 46
4312 0 1159 52
4531 0 1348 61
5093 0 1606 82
5375 1 1606 94
5718 0 1606 100
5875 6 1606 101
6218 12 1606 104
6562 17 1606 107
6906 17 1606 107
7093 17 1606 50
I have my wot zeroed out. Should I try leaning it out to see if im just running rich?
Well, you can see what the knock is from the log. That is scary, so you know the timing is retarding. I am sure lack of fuel is a major part of the problem.Stldave2 said:Whats your timing/egt's doing through all of this? That will help diagnose the problem.
Take care,
David
Look at your knock. There is no way you are running rich. You are running way too lean up top. The idea with injectors is to run a 50% duty cycle. As you can see you are running over 100% high in the rpm range. You are way too lean.jr91gsx said:Base fuel pressure is about 43 with the vac off and 37 to 38 with it on.
I found a small leak and fixed that. I also pulled off the injectors and found two small tears in 2 of the o-rings. So I replaced all the o-rings and went for a ride. Here is a third gear log on about 14 psi with 5 gallons of 100 oct. Fuel filter is new.
Rpms knock Airflow inj/dc
2187 0 333 10
2562 0 529 20
2625 0 567 21
3250 0 774 32
3750 0 907 39
4062 1 1058 46
4312 0 1159 52
4531 0 1348 61
5093 0 1606 82
5375 1 1606 94
5718 0 1606 100
5875 6 1606 101
6218 12 1606 104
6562 17 1606 107
6906 17 1606 107
7093 17 1606 50
I have my wot zeroed out. Should I try leaning it out to see if im just running rich?
Take care,
David
So new injectors is what i need right? How big can I go for now with just the maft 660s or any bigger?
From the log it would appear that way, but that seems weird for only a 14 psi run with 100 octane. What are your current mods?jr91gsx said:So new injectors is what i need right? How big can I go for now with just the maft 660s or any bigger?
Take care,
David
Here are my mods:
30 over je pistons Eagle Rods Balance shafts removed 3" down pipe 3" gm mass air flow sensor upgraded fuel pump 255 Lph 550 injectors Ported 16g Ported O2 housing 2g ported exhaust manifold act 2600 Fidanza Flywheel 4 bolt Logger FMIC AFPR
I dont really understand how I could be overrunning these 550s so bad. They FIC and say 125-500 on them does that mean anything?
So what size injector should I be looking at getting?
30 over je pistons Eagle Rods Balance shafts removed 3" down pipe 3" gm mass air flow sensor upgraded fuel pump 255 Lph 550 injectors Ported 16g Ported O2 housing 2g ported exhaust manifold act 2600 Fidanza Flywheel 4 bolt Logger FMIC AFPR
I dont really understand how I could be overrunning these 550s so bad. They FIC and say 125-500 on them does that mean anything?
So what size injector should I be looking at getting?
I would go with at least 650s, but those numbers still do not seem quite right. You can always go bigger with your injectors. That is why you have stuff to tune them. Then you already have the needed fuel for when you want to upgrade. For example: I know someone that is running a GT35R on a 2G Talon. He runs 880s or 860s I believe (I can not remember the right number). Even when running 29 psi on pump gas, he only has a 62% duty cycle. I believe you need more fuel, but this may not be your only problem. Do you have any other problems? I know when you look at your logs, you see the problems are there, but do you have any sputtering or similar problems? Any problems you can feel as opposed to just the numbers you see?
Take care,
David
Take care,
David
I have no known problems. The car pulls really hard and smooth. I would like to get big injectors like 880s or 860 but I dont think I can tune them with the maft it gives you to much timing. Im thinking about getting dsmlink soon so that would fix that.
Does anyone know how I could be overrunning my injectors on 14 psi. This is really driving me crazy!!!
Does anyone know how I could be overrunning my injectors on 14 psi. This is really driving me crazy!!!
You can tune with only the MAF-T if you wish. There are even a few people running 9's with no other tuning. It is good to have more, but it can be done. I do not see how the car can be pulling hard and smooth when it is pulling 17 degrees of timing (knock retard). Unless your baseline is like +10 or something along those lines. I would say you are underfueled, but it could be that you have a clogged injector, etc.. Regardless, you are not getting the needed fuel there. You are pulling timing and your injectors are working way too hard.jr91gsx said:I have no known problems. The car pulls really hard and smooth. I would like to get big injectors like 880s or 860 but I dont think I can tune them with the maft it gives you to much timing. Im thinking about getting dsmlink soon so that would fix that.
Does anyone know how I could be overrunning my injectors on 14 psi. This is really driving me crazy!!!
Take care,
David
That is a little misleading if you ask me...I don't see how anyone in the world can be running 9's without tuning for a larger setup first...Saying that it is ok to have just a minimal tune w/ a maf-t would not be a good solution; nor advice...You really should be using some other kind of tuning device to fine tune the setup...With atleast an safc, you can have the maft zero-d out, altough safc/maft tuning is known to be a little tricky...DRSully said:You can tune with only the MAF-T if you wish. There are even a few people running 9's with no other tuning. It is good to have more, but it can be done.
DSMLINK is really your best option if you want this car properly tuned...Along with that, there really are almost no size injectors too large for the dsmlink chip to compensate for
You have a built motor and a ported 16g, so I could see where you would be nearing the end of your injectors...If there are no other leaks, I would continue to inspect the fuel system and possibly even the ecu/maf for defects or repairs needed.....You probably should not be maxing those injectors, but your knock is showing 17counts indicating a very lean a/f mixture...
I just said it could be done. It is not something that I would do, but plenty of people seem to do it and get by. For every person that says you need more, there is someone that says you can get by with a MAF-T. The DSMlink is without a doubt the best option, but few people on here are interested in spending that kind of money. I would at least use a SAFC, but like I already said, plenty of people would not.Chicago_DSM said:That is a little misleading if you ask me...I don't see how anyone in the world can be running 9's without tuning for a larger setup first...Saying that it is ok to have just a minimal tune w/ a maf-t would not be a good solution; nor advice...You really should be using some other kind of tuning device to fine tune the setup...With atleast an safc, you can have the maft zero-d out, altough safc/maft tuning is known to be a little tricky...
DSMLINK is really your best option if you want this car properly tuned...Along with that, there really are almost no size injectors too large for the dsmlink chip to compensate for
You have a built motor and a ported 16g, so I could see where you would be nearing the end of your injectors...If there are no other leaks, I would continue to inspect the fuel system and possibly even the ecu/maf for defects or repairs needed.....You probably should not be maxing those injectors, but your knock is showing 17counts indicating a very lean a/f mixture...
Take care,
David
What could I do to test the fuel system? I just pulled the ecu out to see if it was eprom of course its not. Anyways the ecu looks fine I know the caps were replaced.
I looked at the maf and noticed that the screen looks like it is bent in a small place. Would that cause a problem? The fuel pump was in the car when I bought it so I think it has been rewired.
What do you guys think about the airflow is that off at all?
Thanks guys
I looked at the maf and noticed that the screen looks like it is bent in a small place. Would that cause a problem? The fuel pump was in the car when I bought it so I think it has been rewired.
What do you guys think about the airflow is that off at all?
Thanks guys
Do you guys think getting a Safc would help. Or, should I just save and get dsmlink?
any thoughts
it sounds like you need a fuel pump. if your knocking at high rpms, that mean your fuel pump cant supply any more fuel at high rpm. your fuel pump went out, so you should replace it.
1 - 20 of 23 Posts
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