New logs, knock at 9 psi

[SSimple]

This was 9 PSI
TIMA O2 TPS RPM KNK INJP
18° 0.92V 54.1% 2938 0 12.03ms
17° 0.92V 66.7% 3000 0 13.82ms
16° 0.92V 88.2% 3125 0 14.85ms
16° 0.92V 90.2% 3188 0 14.08ms
16° 0.92V 90.6% 3281 0 14.59ms
17° 0.92V 91.0% 3406 0 14.34ms
16° 0.92V 91.4% 3500 1 14.34ms
16° 0.92V 91.8% 3594 0 14.08ms
19° 0.92V 92.2% 3719 0 14.34ms
18° 0.92V 92.2% 3781 0 14.59ms
18° 0.92V 92.5% 3906 0 14.85ms
19° 0.92V 92.5% 4000 0 14.85ms
18° 0.92V 92.5% 4125 0 15.10ms
19° 0.92V 92.9% 4094 0 15.10ms
19° 0.92V 92.9% 4375 0 15.36ms
18° 0.92V 92.9% 4438 0 15.62ms
18° 0.92V 92.9% 4438 0 16.38ms
18° 0.92V 92.9% 4500 0 16.38ms
18° 0.92V 93.3% 4750 0 16.38ms
18° 0.92V 93.3% 4625 0 16.64ms
18° 0.92V 93.3% 4875 0 16.64ms
19° 0.92V 93.3% 4781 0 16.38ms
19° 0.92V 93.3% 5000 0 16.90ms
20° 0.92V 93.7% 4969 1 16.90ms
18° 0.92V 93.7% 5188 0 16.64ms
19° 0.92V 93.7% 5281 0 16.64ms
20° 0.92V 94.1% 5156 0 16.90ms
21° 0.92V 94.1% 5344 0 16.64ms
21° 0.92V 94.1% 5313 0 16.38ms
21° 0.92V 94.5% 5438 0 16.13ms
23° 0.92V 94.5% 5438 0 16.38ms
22° 0.92V 94.5% 5719 0 16.64ms
24° 0.92V 94.5% 5688 0 16.38ms
23° 0.90V 94.5% 5875 0 16.13ms
26° 0.90V 94.5% 5938 0 16.13ms
26° 0.90V 94.1% 5813 0 15.87ms
27° 0.90V 94.5% 5938 0 15.36ms
25° 0.90V 94.1% 6063 0 15.87ms
26° 0.90V 94.5% 6125 0 15.62ms
25° 0.90V 94.5% 6219 0 15.36ms
27° 0.90V 94.5% 6125 0 15.36ms
28° 0.90V 94.5% 6188 3 15.36ms
26° 0.90V 94.9% 6313 2 15.10ms
25° 0.90V 94.5% 6281 2 15.36ms
24° 0.90V 94.5% 6531 1 15.10ms
27° 0.90V 94.5% 6375 1 14.34ms
24° 0.90V 94.5% 6563 1 14.59ms
22° 0.90V 94.5% 6531 4 14.59ms
23° 0.90V 94.5% 6719 4 14.59ms
21° 0.90V 94.1% 6750 4 14.59ms
22° 0.51V 10.6% 6438 0 2.05ms




Here's one at 13 PSI much worse

TIMA O2 TPS RPM KNK INJP
25° 0.88V 71.8% 3281 0 10.50ms
23° 0.90V 80.4% 3344 0 12.80ms
19° 0.90V 83.5% 3438 0 15.10ms
15° 0.92V 83.9% 3563 0 16.64ms
15° 0.90V 84.3% 3656 0 16.38ms
16° 0.90V 84.3% 3813 0 16.38ms
17° 0.90V 84.3% 3906 0 16.38ms
17° 0.90V 84.3% 4031 1 16.64ms
17° 0.90V 84.3% 4156 0 17.66ms
18° 0.90V 84.7% 4281 0 17.66ms
16° 0.90V 84.7% 4438 3 18.43ms
17° 0.90V 84.7% 4469 3 18.43ms
17° 0.90V 84.7% 4625 2 18.69ms
17° 0.90V 84.3% 4656 9 18.94ms
15° 0.90V 84.7% 4906 9 18.43ms
16° 0.88V 84.7% 5000 9 18.18ms
13° 0.88V 84.7% 4875 16 18.69ms
15° 0.88V 84.7% 5156 15 18.69ms
15° 0.88V 84.7% 5031 15 17.92ms
16° 0.88V 84.7% 5344 14 17.92ms
16° 0.88V 84.7% 5375 14 17.92ms
16° 0.88V 84.7% 5281 14 17.66ms
15° 0.88V 84.7% 5469 16 17.66ms
16° 0.88V 84.7% 5719 16 16.90ms
16° 0.88V 84.7% 5594 16 16.64ms
20° 0.88V 84.7% 5594 15 16.64ms
17° 0.88V 84.7% 5688 15 16.38ms
20° 0.88V 84.7% 5906 29 16.38ms
15° 0.88V 84.7% 5844 28 16.38ms
14° 0.86V 84.7% 6063 35 15.87ms
11° 0.88V 84.7% 5969 42 13.57ms
8° 0.88V 84.7% 6063 42 14.85ms
12° 0.86V 84.7% 6094 42 15.62ms
11° 0.86V 84.7% 6281 41 15.87ms
10° 0.86V 84.7% 6375 41 15.62ms
14° 0.84V 84.7% 6281 41 16.13ms
11° 0.86V 84.7% 6375 40 14.59ms
11° 0.84V 84.7% 6469 40 14.34ms
12° 0.86V 83.5% 6531 39 15.10ms
10° 0.86V 51.8% 6500 39 3.58ms
32° 0.04V 11.4% 5781 14 1.28ms
43° 0.06V 11.4% 5156 0 1.28ms



There are several things i've noticed to be wierd on these logs, First obviously is the knocking, this is pretty low amounts of boost, and my motor wont handle it.

1. Why do my injector pulse width go down as fuel demand goes up? I can see it leaning out, but why at such low boost?
2. Several times you will see the rpms drop by 100 or so, then come back up during the pull, This shows up in the log, but everything was smooth during the pull?


Mods include
Small 16g
Rebuilt motor, ross pistons (8.5:1)
Balance shafts removed
Rewired stock fuel pump
RC 550cc injectors
Timing set to 4 degrees in an attempt to reduce knock


What you all think?

 

[ucancallmedebo]

I would spend 90$ and uprgrade the fuel pump, well worth it IMO. Chances are it is running out of capacity on the 16G. Its also colder this time of year and will cause your car to need more fuel too. I would appear that your injector pulse width is not near maxed out so the fuel pump/pressure is likely the problem of the lean condtion.

 

[SSimple]

I have a walbro255, but when i put it on, the car sputters over 4500 rpms, Almost like its putting out the fire with too much gas.

and why is my injector pulse going down as the demand goes up?

 

[Nanan]

When you installed the 255 did you happen to install a FPR? The lack of one could cause this issue you have had. The stock fpr can not deal with that much fuel or pressure so the excess is not being returned to the tank, instead it is just being forced out of the injectors at a much higher then desired rate.

As for the knock it is likely that your current FP is going out, as FP get old they get weaker and start phasing out for breif periods then returning, it will eventually just stop working.

 

[SSimple]

I replaced the stocker once already, and then again with the 255, then went back to the replacement stock pump. Knock has been there the whole time. Even with the 255 during the sputtering

damn dsm

 

[5150DSM]

The answer has been given to you. The stock pump is running out of steam. The injector pulsewidth drops off suddenly when the pump can no longer supply the demand of the injectors. Install the 255 with an FPR or sell the 255 and buy and install a 190, which you shouldn't need an FPR for. Bottom line, you need more fuel. Hope this was helpful.
Aloha

 

[espinelli]

I agree that you need an AFPR on that 255 pump. But I find it strange that your running out of fuel at only 9psi...just wondering how much air you were moving at 9psi (how many #'s per min?)

I also think there maybe something else going on. Either way start with an aftermarket AFPR as everyone suggested.

You might want to back off the timing advance based on your first set of logs. Not sure what kind of tuning electronics you have but, keep in mind you can manipulate the timing curve using an AFPR and SAFC.

The second logs you seem to be running lean, although I believe those 02 readings are acceptable on a 1G.

 

[SSimple]

I agree that you need an AFPR on that 255 pump. But I find it strange that your running out of fuel at only 9psi...just wondering how much air you were moving at 9psi (how many #'s per min?)

I also think there maybe something else going on. Either way start with an aftermarket AFPR as everyone suggested.

You might want to back off the timing advance based on your first set of logs. Not sure what kind of tuning electronics you have but, keep in mind you can manipulate the timing curve using an AFPR and SAFC.

The second logs you seem to be running lean, although I believe those 02 readings are acceptable on a 1G.

Your seeing my point, this shouldnt be happening at 9 psi on a Small 16g. I dont have a SAFC or anything to manipulate the timing or fuel. I shouldnt be flowing that much more air than stock, since its all stock except the turbo (induction wise) What really gets me, is seeing people push 16 psi on stock fuel systems, and mines takes a shit at 10. Gonna buy a afpr when i get the cash, and see how it goes

 

[oldman]

Hey guys, I've been doing a lot of reading in the tuning section because I'll be tuning my car in about 2 weeks. I was wondering if the fact that simple is running 550s without a tuning device would have any relations with his problem? If so, how? I'm just learning, thanks.

 

[Mr.Tao]

Well...I cant get my logger up and running, and I have seen other member's logs but dont remeber. Post a log with the 255 pump in. And see if the injectors width decrease.

 

[XtReMeToYz]

What were your new mods? I skimmed the thread quick but didnt see anything about a boost leak test. Do one and see what happens, if it was your turbo upgraded its very possible you have a boost leak somewhere.

 

[SSimple]

I have looked for a boost leak, and i think there is a small one still hanging around, but unless my logic is wrong, would a boost leak not cause it to run rich and not lean? The turbo was put on when i rebuilt the engine. I took alot of care to make sure everything was tight on the intake side.

I'm starting to just think, that The slight increase in flow from the 16g turbo, combined with the raised compression of my ross pistons (8.5:1) is just causing it to need more fuel. I'm really at a loss as to what to do other than getting an AFPR, and walbro 255, that and fixing any boost looks i may have.