TT chip and octane

[Steve Wood]

don't be surprised if the pl log shows it to be false...if the computer is pulling enuf timing, you will feel it and the engine will miss

Or you may have a dirty injector that is not spraying enuf fuel

[Shimy87]

Steve, I'm starting to believe it is false. Had the injectors professionally cleaned this winter. Put a new fuel filter in this morning and its a fresh tank of 91 non ethanol.

I hope I can get some logs!

Thanks!!

[Shimy87]

logs attached, one normal acceleration to 60, on 5 lb boost pull and one 10 lb pll

[Steve Wood]

the log shows it to be running very lean as the boost comes up.

When the car is warmed up and sits idling, the O2s should be 780-800 and should be pretty steady rather than bouncing up and down.  Is this what you see?

[Shimy87]

yes, pretty steady in the 800 range, when you touch the gas for a sec it starts jumping again then settles back at 800 range.....I have chip set to 5% rich at idle so its just above 800

[Shimy87]

Sorry. Just checked a warmed up idle log and its a steady 357 at 170 degrees water temp

[Shimy87]

idle logs

[Steve Wood]

It may not have been warmed up quite enuf, but...

I don't know what the maf should read at 10 psi, but, I would think it would be at least 200?  It's not calling for much fuel at 160-170

maybe take the maf off your car and try it on this one?

[Shimy87]

Will try it

So when I know its for sure warmed up I want to see 780-800 at idle?

[Steve Wood]

yes, and a steady reading over a close range...not bouncing to 400 and back up...should be a pretty steady line on the o2 graph

[Steve Wood]

might also try a short spurt up to 10 psi with more gas pedal.  It is showing performance enrichment but it's not getting much air to be making boost thru the butterfly

[gnonyx]

the log shows it to be running very lean as the boost comes up.

When the car is warmed up and sits idling, the O2s should be 780-800 and should be pretty steady rather than bouncing up and down.  Is this what you see?

Hi Steve, Sorry for intervene this thread, but the O2 is bouncing up and down and not being steady around 700-800, what is the cause?

[Steve Wood]

I don't know is the short answer.  The first time you start the car, it will not go into a simulated closed loop at idle.  Instead, it will be learning the parameters it needs to simulate a closed loop.  Here are the comments from Eric's instructions.


7. The very first time you start the car with a new chip, the idle may flare up to around 2000rpm.This is common, as the ECM has lost track of the idle air control motor’s position. Simply turn the
car off and wait about 5 seconds, then restart. The idle should return to normal.
8. This chip utilizes an open loop idle mode for smoothness (not emissions chips). The first time the
car is run, open loop idle mode will not be enabled. This is to allow the BLM’s to learn quicker.
Once the car is warmed up and driven around, the next time the car is started, open loop idle will
be enabled for a smoother idle.
9. The car may need to be warmed up and driven around for the ECM to re-learn, in order for it to
run its best. Once the car is warmed up (160ºF), most of the learning can be done in about 15
minutes of city driving. Open loop idle will not be enabled until the ECM has “learned” and the car
is restarted the 2nd time (does not apply to emissions chips).

[gnonyx]

I don't know is the short answer.  The first time you start the car, it will not go into a simulated closed loop at idle.  Instead, it will be learning the parameters it needs to simulate a closed loop.  Here are the comments from Eric's instructions.


7. The very first time you start the car with a new chip, the idle may flare up to around 2000rpm.This is common, as the ECM has lost track of the idle air control motor’s position. Simply turn the
car off and wait about 5 seconds, then restart. The idle should return to normal.
8. This chip utilizes an open loop idle mode for smoothness (not emissions chips). The first time the
car is run, open loop idle mode will not be enabled. This is to allow the BLM’s to learn quicker.
Once the car is warmed up and driven around, the next time the car is started, open loop idle will
be enabled for a smoother idle.
9. The car may need to be warmed up and driven around for the ECM to re-learn, in order for it to
run its best. Once the car is warmed up (160ºF), most of the learning can be done in about 15
minutes of city driving. Open loop idle will not be enabled until the ECM has “learned” and the car
is restarted the 2nd time (does not apply to emissions chips).

Thanks for the info, as for myself I'm still waiting for the heater hoses replacement, it's only been 2 weeks.
I will give you more update on my thread after receiving and installing heater hoses

[Shimy87]

These logs are right after unplugging the orange wire underhood. I always unhook that when messing with ecm. So these logs are with only 10 minuets of highway driving.....co mputer was probably still learning? BLM was between 125 and 128