Newbie Log: This can't be healthy can it?

['89beretta]

I just got my logger a couple days ago. Mods: 14b @ 16psi, free mods, 2.5" downpipe, hi-flow cat, 2.5 catback, K&N, stock fuel system. Anyway, I'm getting crazy knock. Take a look.

RPM KNOCK TIMING O2 TPS
3031 0 16 .92 59%
3218 0 15 .94 78%
3375 5 13 .92 84%
3593 16 10 .92 85%
3687 29 6 .92 86%
3781 28 7 .92 87%
3875 28 8 .92 87%
4062 27 8 .92 88%
4125 27 8 .92 88%
4343 26 9 .92 89%
4406 26 9 .92 89%
4593 25 9 .92 89%
4687 25 10 .92 89%
4781 24 10 .92 89%
4983 24 10 .92 90%
5187 23 12 .92 90%
5218 26 11 .92 91%
5406 26 11 .92 91%
5500 25 13 .92 91%
5687 25 13 .92 91%
5843 24 14 .92 92%
6031 23 15 .92 92%
6250 25 13 .92 93%
6312 24 12 .92 93%
6437 23 12 .92 94%
6562 23 13 .92 94%
6625 26 11 .92 95%
6781 26 11 .92 95%
6812 25 11 .92 95%

Now I know that amount of knock can't be healthy for the car. The timing looks low too. The scary thing is I"ve been running at the track for a year with this setup. I'm surprised the engine has lasted this long. Any comments or suggestions would be appreciated. And yes, I know I have to upgrade my fuel system.

 

[andymoraitis]

I'm no tuning guru, but that looks really bad. I'd definitely back the boost down until you can add some fuel to the mix. What's weird is that the 14B shouldn't induce that much knock on a stock fuel system at 16 psi. It almost makes me wonder if your knock sensor is bad. Also, are you running too much base timing?

Let us know what you find eh?

Andy

 

['89beretta]

That's what I thought too. From what I've seen and heard, a 16 psi on the 14b shouldn't be giving me those catastrophic knock numbers. I can only lower my boost down to 15 for some reason after taking out the BCS and adding the 2.5 downpipe.

I'll have to check my base timing. Would it affect the car that much? Thanks for the advice.

 

[Quasimondo]

Your fpr might be on the way out the door as well. A quick test for that would be to get a set of vice grips and ping down a bit on the return line to artificially raise your fuel pressure. If the knock decreases, then it's your fpr.

You could also try rewiring your fuel pump to get a solid 14 volts to the pump.

 

[Nanan]

Have you replaced your fuel filter lately? It looks like your short on some fuel.

 

[andymoraitis]

I think, in hindsight, that checking the CAS might be a good idea as well. You could be experiencing phantom knock, but I'm not experienced enough to know the difference. I think the above posters have some great suggestions.

Keep us posted,

Andy

 

['89beretta]

Thanks for the responses. The fuel filter is a good suggestion. I haven't even thought of that and haven't changed it since I first got the car.

Also, today I went to the track and was only seeing 10-15 counts of knock and the timing wasn't being pulled as much. It went up to about 17-18 in the upper rpms and stayed there. After a couple runs, the poor little sidemount was heatsoaked and I saw knock counts in the 20's again with timing dropping down to 13-14. Someone at the track mentioned rewiring the fuel pump, so I'll try that too once the 190 is on.

 

[zrk666]

i would check everything in the fuel system, fuel filter, injectors, lines from the tank to the rail and etc..

 

[Cyclone_90]

Try adj. you TPS. It should say 100% on that run