Need help...

[DanD1984]

My car is pretty messed up, I believe...

This is a 1-2-3 pull at 17lbs boost...stock fuel system on 93 fuel

I think I need more fuel looking at my 02 sensor readings - they look alittle low and my knock is out the roof.

Just want your opinion sorry the log is so long

FTRL FTRM FTRH
139.62 124.8 139.62


RPM TPS TIMA O2-R KNCK INJP
1st Gear
3188 11.76 38 0.12 0 1.79
3250 11.76 39 0.27 0 1.79
3281 27.06 40 0 0 6.14
3531 64.71 32 0.72 0 7.68
4063 75.29 27 0.78 0 11.52
4750 96.08 25 0.8 0 17.15
5188 96.08 19 0.8 0 21.5
5844 96.08 18 0.78 31 19.2
6531 67.45 10 0.74 42 7.42
6625 33.73 7 0.78 30 10.24
2nd Gear
4750 96.08 24 0.6 35 20.48
4375 96.08 5 0.82 35 20.99
4406 96.08 5 0.8 40 21.5
4750 95.69 4 0.8 39 21.25
4813 96.08 4 0.8 39 21.25
5094 96.08 5 0.78 39 20.74
5438 96.08 6 0.78 38 20.99
5594 96.08 8 0.78 38 19.71
5813 96.08 8 0.78 39 18.69
5813 96.08 9 0.78 38 19.46
6250 96.08 10 0.78 43 18.18
6406 96.08 8 0.76 43 16.13
6469 75.29 9 0.74 43 12.8
6500 51.37 7 0.8 31 13.57
3rd Gear
4281 96.08 18 0.8 31 19.46
4625 96.08 7 0.8 31 20.99
4625 96.08 7 0.8 33 20.48
4656 96.08 7 0.8 33 20.74
4969 96.08 7 0.8 33 20.74
5000 96.08 7 0.8 32 20.74
5063 96.08 8 0.8 32 20.22
5094 96.08 9 0.8 34 20.48
5313 96.08 7 0.78 33 20.74
5375 96.08 8 0.78 33 19.71
5500 96.08 9 0.78 33 19.71
5594 96.08 8 0.78 37 19.97
5594 82.75 9 0.76 36 19.2
5594 5.49 10 0.82 27 1.28
5125 5.49 37 0.6 3 1.79
4563 5.49 45 0.62 0 1.28
4156 5.49 43 0.6 0 1.28
4094 5.49 42 0.62 0 0
4125 5.49 29 0.7 0 0
3969 5.49 28 0.02 0 0
3906 5.49 28 0 0 0

 

[talon1987]

ya by the looks of yur o2 readings yur running pretty lean ... injector pluse width looks right ... do you have any vaccum or boost leaks ... possibly cloged fuel filter or yur fuel pump isnt doin its job or bad FPR all that would cause you to run lean... i would check for vaccum or boost leaks first and make sure you dont have any

-Pat

 

[GVR4592]

17 psi on stock fuel system is not a good idea. With it knocking that much why would you even continue into higher gears? That run must have felt pretty rough. Turn the boost down to a point where it doesn't knock at all, probably around 12-14 psi. It will be much faster at 14 psi with no knock then at 17 psi with that much knock.

Then you should consider upgrading your fuel system. Most people do that before they turn the boost up.

 

[blcknspo0ln]

17 psi on stock fuel system is not a good idea. With it knocking that much why would you even continue into higher gears? That run must have felt pretty rough. Turn the boost down to a point where it doesn't knock at all, probably around 12-14 psi. It will be much faster at 14 psi with no knock then at 17 psi with that much knock.

Then you should consider upgrading your fuel system. Most people do that before they turn the boost up.

Correct. You are running too much boost for your fuel system to handle. Turn your boost down to 13psi and do another log. You're almost garaunteed to have a lot less knock. Also, for future reference, here is a rough estimate of how much boost you should be able to run with more fuel mods. Of course adjust as necessary since every car is different. Use your logger!!!

stock - 13psi max
190+ FP - 16 psi
190 + inj. - sky's the limit.

Of course after you get your injectors, you must look at what size they are and what turbo you have to determine how much boost you're going to run. Do a LOT of research before you turn the boost up! keep your logger handy after you make any adjustments to your boost/fuel levels. This way you can keep a strict watch over your knock.

goodluck

 

[DanD1984]

Thanks guys...I have a 255 HP in my apartment and im just waiting on a FPR, SAFC II, and Injectors. I think that will clear it up. Boost is down again.

 

[blcknspo0ln]

Thanks guys...I have a 255 HP in my apartment and im just waiting on a FPR, SAFC II, and Injectors. I think that will clear it up. Boost is down again.

Nice! what injectors did you get? 20 psi is fun

 

[FORMONTOYA]

Don't tune off the NB O2 sensor.

Check for boost/exhaust leaks between the metering device and the O2 sensor as that will make the O2 readings low with the extra unmetered air entering the system.

As stated, until the new fuel system goes in, turn the boost down.

And good lord, thats a lot of knock.


Jim

 

[DanD1984]

Ok this is a 13lb pull.....Looks ten times better



RPM TPS TIMA KNCK O2-R
3594 30.6% 30° 0 0.37V
3781 30.6% 30° 0 0.14V
3906 33.3% 29° 0 0.12V
4375 65.5% 27° 0 0.84V
4469 91.8% 24° 0 0.90V
4781 96.1% 18° 0 0.92V
5219 96.1% 19° 0 0.92V
5406 96.1% 21° 0 0.92V
5750 96.1% 22° 0 0.92V
5844 96.1% 23° 0 0.92V
6125 96.1% 24° 0 0.92V
6313 95.7% 23° 0 0.92V
6844 5.9% 20° 0 0.90V
6625 5.5% 35° 0 0.74V
6625 47.1% 45° 0 0.94V
5125 96.1% 35° 0 0.76V
3688 96.1% 20° 0 0.92V
4219 96.1% 17° 0 0.94V
4250 96.1% 18° 0 0.94V
4438 96.1% 18° 0 0.94V
4594 96.1% 18° 0 0.94V
4656 96.1% 18° 0 0.94V
4750 96.1% 18° 0 0.94V
4844 96.1% 19° 0 0.94V
4875 96.1% 19° 0 0.94V
5125 96.1% 19° 0 0.94V
5094 96.1% 19° 0 0.94V
5250 96.1% 21° 0 0.94V
5375 96.1% 21° 0 0.94V
5438 96.1% 22° 0 0.94V
5563 95.7% 22° 0 0.94V
5563 93.7% 22° 0 0.92V
5781 91.8% 23° 2 0.92V
5875 91.8% 22° 2 0.92V
6063 87.8% 22° 2 0.92V
6031 54.9% 23° 2 0.92V
5844 5.5% 23° 0 0.94V
5969 36.1% 45° 0 0.96V
5813 96.1% 32° 0 0.82V
4031 96.1% 28° 0 0.90V
4188 96.1% 18° 0 0.96V
4313 96.1% 18° 0 0.94V
4250 96.1% 17° 6 0.94V
4219 93.3% 16° 5 0.94V
4375 89.8% 16° 5 0.94V
4438 86.7% 16° 5 0.94V
4594 85.9% 16° 5 0.94V
4625 85.9% 16° 5 0.94V
4625 85.9% 16° 5 0.94V
4500 38.4% 16° 4 0.94V
4438 5.5% 27° 0 0.90V

 

[Dream On]

I noticed that your TPS isn't reading 100% or like 99.x%. I would try and find what the cause of that is as well. Sorry to add to your list of stuff to do. haha.

 

[DanD1984]

I noticed that your TPS isn't reading 100% or like 99.x%. I would try and find what the cause of that is as well. Sorry to add to your list of stuff to do. haha.

No its alright....Im just trying to get my car is top shape before summer... This is all helping

 

[sbiggi]

The first log file you posted you are running 95% Injector Duty cycle. So obviously you arent getting enough fuel.

Keep the boost down untill you get your injectors.

TPS showing 99% compared to 100 isnt going to make any difference in the tune.

-Seth

 

[DanD1984]

The first log file you posted you are running 95% Injector Duty cycle. So obviously you arent getting enough fuel.

Keep the boost down untill you get your injectors.

TPS showing 99% compared to 100 isnt going to make any difference in the tune.

How do you figure out the Injector Duty Cycle

 

[sbiggi]

How do you figure out the Injector Duty Cycle

You can use this handy calculator
http://www.stealth316.com/2-calc-idc.htm

-Seth

 

[GVR4592]

That 13 psi pull is beautiful. I bet your piston rings are very very happy.

 

[Dream On]

TPS showing 99% compared to 100 isnt going to make any difference in the tune.

-Seth

I get what you're saying there, but I would still check to see if the throttle plate is opening fully.