[90GSTBOOSTED]

Maybe all this is due to bad tuning but I honestly don't know what to do anymore. My mods are in my signature and I have tuned the fuel trips with my SAFC to as decent as possible, I was getting no knock while doing a run, and still when I did 0-60 mph acceleration run on a local road I got 6.88 seconds as my fastest time. I am running only 14 psi boost right now but come on, I was running 15-16 psi on my 14b with 450cc injectors and I got 6.4 seconds. I am using a complete professional timer so it's all accurate, on a level road.
Some things I see on my logger are: O2 sensors does not go higher than 0.82V at WOT, my injector duty cycle goes to a maximum of 95%, and I have random very low counts of knock after I added some fuel to some rpm points after having some knock from the previous runs.
I have no boost leaks since I did a boost leak test and also the car feels smooth when accelerating, it's just moving slow. I don't know what the problem is. Am I running too low of boost for this turbo to kick in as it should??
How much boost can I run with these 550cc injectors? From the duty cycle I think these injectors are kinda suffering even at 14 psi..?? I still don't have an exhaust but I will be adding 3" exhaust all the way from the turbo. I doubt that will help that much besides adding a bunch of noise.
What do you guys suggest to do, some things I have missed or skipped somewhere along the road??? I was really expecting to be in the 5 second range with this turbo and all the mods I did. This is absolutely ridiculous. I also launched the car perfect, especially one of the runs it was great. Dropped the clutch at around 3k rpm, just tweaked the tires, which are race tires, and too off without any bogging down or signs of loss of power or rpms. I shifted the gears fast like a maniac... I don't think it was my driving since I drove the car with the 14b as well. ANy ideas?

 

[ssearles]

Yes 5 things:
1)The 14b at 16 psi is probably pretty close to the flow of the EvoIII 16g at 14 psi.
2)The Evo III 16g can handle WAY more boost than 14 psi on 550cc injectors. I personally can hold steady 22 psi on the E316g with 550's and it keeps a good air/fuel mixture. I haven't tried going beyond 22psi, so that may even be possible too.
3)Your exhaust is holding you back BIGTIME. Not only is it restricting flow, but it's probably causing boost creep too. Which means:
4)I wouldn't turn the boost up any more until you get a 3" turbo-back exhaust.
5)The 16g has a little more turbo lag, especially if you're running lower boost than you were on the 14b, so that's going to hurt your time.

 

[90GSTBOOSTED]

Well that sounds promising, it means it's all my fault. That's easy then, I just have to change these things. Can the 550cc injectors really support up to 22 psi of boost? My injector duty cycle is already at 90+ %..??
So the exhaust makes a huuge difference? I knew it would help but I wasn't expecting it to be that much of a problem. I guess I will have that done asap, maybe even by next week. I just don't want it to be noisy and loud.

 

[ssearles]

I don't really know where this injector duty cycle reading is on the SAFC, I've never seen/used it. Maybe you're confusing it with the throttle reading? I don't know. I can tell you that I have 550cc's and I run 22psi every day if I want to.

The more you turn up the boost, the bigger the bottleneck the exhaust becomes. 14 psi on the E316g is already way more flow than the stock setting of 10psi (?) on the 14b that the car's exhaust was meant to handle. Trust me, the exhaust is a huge and absolutely necessary improvement.

I do have a 255lph pump, but I don't think that becomes a factor until higher HP.

 

[90GSTBOOSTED]

The injector duty cycle can be seen on the logger, not the safc.

I already started looking for parts for my exhaust. Since I can weld anything and have everything in my garage I will do my own custom exhaust system. I will try to have the whole thing flow-through with no restrictions and a couple of flow-through resonators to lower the sound.

 

[ZishanMalik]

Does this car have a cat on it? Just taking the catalytic converter (for off-road use only ) on a stock exhaust will make a huge difference.

 

[Mike000]

Have you tried running a boost leak test?

 

[90GSTBOOSTED]

The cat does have a cat and yes, I did a boost leak test and I have no leaks.

 

[turbogrrrr]

550's with my evo III 16g were running out of juice aroung 22-23 psi. I now have 650's and at about 19-20psi I am in the mid 80's on duty cycles.

 

[CanadianTSi]

You should not be out of injector at only 14psi.

I would do another boost leak test, because the only way to flow enough air at that psi to make the computer think your out of injector is to have a boost leak.

And another thing, tuning plays a huge part in this, what are you high settings on the S-AFC?

 

[revmatch]

I may have missed this, but what are your wideband readings?

 

[Die-Civic-Die]

I still don't have an exhaust but I will be adding 3" exhaust all the way from the turbo. I doubt that will help that much besides adding a bunch of noise.

Oh my god. Thats awesome!
:chair:

 

[heinzer97]

I know my car doesnt boost pass 12 with 450's, if this is any help

 

[ssearles]

Does this car have a cat on it? Just taking the catalytic converter (for off-road use only ) on a stock exhaust will make a huge difference.

This is true. The thing with the exhaust is, not only are you going to get a small HP gain, but more importantly you're getting rid of backpressure. The turbo will spool much faster and you will feel much more of a kick when you punch the gas. And by small HP gain I mean like up to 5-10 throughout the whole RPM band, which isn't bad, and that's at stock boost levels. The more boost, the more of a difference the exhaust will make. The cat is the biggest obstruction and causes a lot of backpressure. Getting rid of that alone will make a big difference.

 

[heinzer97]

Not to brag up ebay or nothing like that but they do have high flow magnaflows on there that you can pick up for 50 brand new!

 

[90GSTBOOSTED]

I am already set on a Magnaflow muffler with 3" inlet and dual 2.5" outlets which will come out to each side of the car, in front of the rear tires, like the Mustang Saleen. I will also put a 3" high flow cat since I need one for emissions. Either way, 3 inches are 3 inches, a huge improvement so it should be good.

 

[revmatch]

:tat: dual exhausts on a 4-banger

 

[90_talon_matt]

3)Your exhaust is holding you back BIGTIME. Not only is it restricting flow, but it's probably causing boost creep too. Which means:
4)I wouldn't turn the boost up any more until you get a 3" turbo-back exhaust.

The smaller diamter stock exhaust is preventing boost creep. When you go to a higher flowing, larger diameter exhaust you turn the turbine outlet into the path of least resistance as aposed to the wastegate passage. This gas that would have been expelled is now acting on the turbine blades and therefore causing an increase in boost. The only exception with this comes with the EvoIII 16gs as they have a very poorly designed turbine housing. There is a large "hump" in the casting of the turbine inlet right above the wastegate port that diverts the flow away and towards the turbine blades = an increase in pressure. Now that we have that sorted out....

To the original poster. That turbo doesn't really wake up until over 15psi. I wouldn't be overly concerned with your injector duty cycles and instead I would focus on your knock sums and your wideband reading. Your 550s have a lot left in them still. Your exhaust is not really limiting you with anything but making more power. It's not a bad thing, especially because it'll feel like you gain 100hp when you finally go to a 3" .

It sounds to me that you just need to spend a little more time tuning. You have all the neccesary tools in front of you. Might as well use them to their full potential.