Noob needs help with Roadrunner

[WeathermanShawn]

Well, your HO2xx looked a lot better..but there are still some patterns I would not call normal. At this point your O2 sensors may be working, but may be responding to the fuel delivery issue that is still evident.

Your LTFTS still swing more than normal. On Log 0011:
Bank 1: -3.9 to +11.7.
Bank 2: -8.6 to +9.4

That an unsymmetrical swing from Bank 1 to Bank 2..and the actual variance seems out of norm.

I would still concentrate on the fuel pump/fuel delivery issue. Without 58 psi I don't think you will have a normal injector flow. You are overall still lean (Trim-wise) and do not have the correct fuel pressure for an LS1 engine..

[Gjohnson]

Your fuel pressure sensor at the rail says 65 psi...?

Have you confirmed that this is correct by comparing with a known fuel pressure gauge...?

If it is correct, then you have to rescale B4001 IFR table by sqrt(65/58) since the stock IFR is for 58 psi.

Or can you adjust the in-tank regulator so that pressure at the rail is 58 psi...?

Ok, well as far as the fuel pressure is conceerned I guess I need to use the formual Joe posted for B4001 and multiply the entire table by that amount???

square root(65/58)

sqrt(1.12068966) = 1.058626305724741

So I'm assuming I multiply the entire B4001 table by 1.058%, is that correct?

[Gjohnson]

As a side note, from the logs I posted it seems that my avg fuel pressure is higher durning the 2nd log for some reason. Is that normal withe the increase in outside temp?

[joecar]

As a side note, from the logs I posted it seems that my avg fuel pressure is higher durning the 2nd log for some reason. Is that normal withe the increase in outside temp?

That might be a sign that the fuel line is getting heated somewhere.

[joecar]

Ok, well as far as the fuel pressure is conceerned I guess I need to use the formual Joe posted for B4001 and multiply the entire table by that amount???

square root(65/58)

sqrt(1.12068966) = 1.058626305724741

So I'm assuming I multiply the entire B4001 table by 1.058%, is that correct?

Yes, but only if 65 psi is correct...

if you get a ±2 psi variation then use the center pressure... e.g. 63±2 psi (I saw your pressure ripple in the range 61-65 psi).

BUT: if your fuel line is getting hot (gasoline may be boiling) then this will not help.


We have to think about what your logs mean...

[WeathermanShawn]

BUT: if your fuel line is getting hot (gasoline may be boiling) then this will not help.
We have to think about what your logs mean...

I think Joecar may be on to something there (fuel temperature). If you think about when you fill up with gas (cooler fuel) your Trims go very negative until the fuel heats up.

I guess you could always switch NB positions (flip them) and see if the asymmetrical Bank-Bank Trims still exist..

[joecar]

I'm looking over one of the log files... but I haven't come to a conclusion yet...

[joecar]

Maybe try this (but let's see what Shawn says first): add 8% to MAF and take another log.

Also, swap NBO2 sensors left/right as Shawn said.

[WeathermanShawn]

Maybe try this (but let's see what Shawn says first): add 8% to MAF and take another log.

Also, swap NBO2 sensors left/right as Shawn said.

That sounds like a plan. The +8% to the MAF should level the Trims to +/0..and swapping the O2's will tell us whats going on the Bank variation..

I say do it..

[joecar]

Yes, do it...


(and leave IFR calculation alone for now)