required Fuel pressure for LS3

[morepowerjoe]

Alright guys so I fix one problem and another one pops up like whack a mole. I'm not sure what's going on but I think that maybe my fuel pump is going out or something because when I floor it now around 6k rpm it drops fuel pressure to 50 psi and cut's timing to -10 is where I have the torque management set to. Could someone please take a look at my log and tell me what you think? It does it at the time 11:32 and some other times too. Thanks guys.

Camaro log with cut out at high rpm.hpl
Camaro SS3 best tune 2 test.hpt

[TheMechanic]

Fuel delivery issue. Pressure dropped, AFR went to 13 to 1. FPCM was commanding 58. Need to daig it. Restriction? Bad pump? plugged screen? higher requirement due to power adders? Maybe even a higher E content than what it is thinking.

[morepowerjoe]

Fuel delivery issue. Pressure dropped, AFR went to 13 to 1. FPCM was commanding 58. Need to daig it. Restriction? Bad pump? plugged screen? higher requirement due to power adders? Maybe even a higher E content than what it is thinking.

All I did was remove the cats and went with a true x pipe among all the other mods I've done main thing being a GPI SS3 vvt camshaft. So do you think that is why it also pulled timing? And it's been a couple weeks since I did the exhaust work. Maybe pump starting give out, it does have a 171k miles on it.

[Alvin]

It loosing 8 psi isn't a huge deal. Most will loose a couple.. Its on the edge of excessive but without seeing pump duty cycle and learns its hard to say for sure.

The huge timing dip in the middle of one run looks like that VVE error but the tune appears to be in speed density. Does it pick up a MAF code after driving? Could be a bad ground too.

[morepowerjoe]

No it doesn't have a maf code and the tune should be in maf only.

[morepowerjoe]

Is there a way to log pump duty cycle?

[TheMechanic]

You are at 13 to 1 AFR at full throttle, 100% load. Needs more fuel one way or another

[morepowerjoe]

Ok understood. Thank you.

[morepowerjoe]

I'm N/A right now and it will be a while before I go to boost. I'm driving a 2012 Camaro SS Auto with the stock pump on a built engine. If I go to a ZL1 fuel pump, can I just change the pump and reuse my SS fpcm or do I need a ZL1 one? And is there tuning that must be done?

[Alvin]

Datalog the fuel pump duty cycle and long and short term fuel pump trims also.

13:1 isn't overly lean.. I don't know what your targeting but the fuel pressure isn't the reason why it is lean.

[morepowerjoe]

Datalog the fuel pump duty cycle and long and short term fuel pump trims also.

13:1 isn't overly lean.. I don't know what your targeting but the fuel pressure isn't the reason why it is lean.

Well I couldn't get it to hic cup again but here is the log. I messed around with my braf settings again, that wouldn't effect it would it? Thanks Alvin
fuel pump log.hpl
Camaro SS3 best tune 3 test.hpt

[Alvin]

it does appear like the pump is weak. Its trying to add to pump dc and the pump is near 100%. Its not an emergency. I do think you an get the AFR down from where you are but I'd think about putting a pump in it soon.

[morepowerjoe]

Thanks Alvin

[morepowerjoe]

Kind of off topic but could someone tell me why my EQ Err on the graph isn't logging. Do I need to add the channel equivalence ratio for it to work?