[Dark9T]

anyone can tell why my fuel trim bank one and bank two is way off? but the AFR are the same..



Uploaded with ImageShack.us
same log


Uploaded with ImageShack.us

[OpenFlash]

Bank imbalances are usually caused by methanol not distributing properly. Which is why, for single turbo applications, we mount the nozzles in the FMIC end tank. This gives it a lot more time to atomize and create a homogenous charge. But for stock turbo applications, leaving it in the charge pipe (as upstream as possible) is fine. So is such a fuel trim imbalance. Nothing to worry about.

If you are not running methanol, imbalances can be caused by variances in injectors (esp when dealerships only do recalls on 1 bank and not the other) or wear and tear on o2 sensors (someones only one gets replaced the other wears at a different rate).


edit. I'm blind. You are running methanol as shown in the log. So the first bit of my response applies to you

I take that you logged a 3-4th gear 6AT run? Looks good.

[Dark9T]

Originally Posted by shiv@vishnu

Bank imbalances are usually caused by methanol not distributing properly. Which is why we mount the nozzles in the FMIC end tank. This gives it a lot more time to atomize and create a homogenous charge.

If you are not running methanol, imbalances can be caused by variances in injectors (esp when dealerships only do recalls on 1 bank and not the other) or wear and tear on o2 sensors (someones only one gets replaced the other wears at a different rate).

So is it ok to drive the car with different afr bank1 and bank2? Is my car runing optimum? Besides the afr runs a little rich, my timing looks good and solid, should I adjust the open loop fueling too lean it out a little bit more? and there any way to bring the timing up a little more?

[Dark9T]

Shiv, my OpenFlash real time data not working properly, it wouldn't connect.

[OpenFlash]

Originally Posted by Dark9T

So is it ok to drive the car with different afr bank1 and bank2? Is my car runing optimum? Besides the afr runs a little rich, my timing looks good and solid, should I adjust the open loop fueling too lean it out a little bit more? and there any way to bring the timing up a little more?

AFR bank 1 and 2 are pretty much even. I think you mean Fuel trim which is always going to deviate when running methanol injection (unless you mount the nozzles way upstream in the FMIC end tank). Adjusting open loop fuel doesn't make the setup run richer or leaner. All it does is raise/lower the fuel trims. And you're trims aren't anywhere close to reach their limits so I'd leave it alone. To make the car run richer/leaner you will need to change the values in the AFR offset table. But I wouldn't do that arbitrarily. That stuff is best left for doing on the dyno as the butt dyno is pretty insensitive when we start talking in this small of a scale.

You're timing is pretty solid. I wouldn't adjust it upwards without some sort of dyno tuning. With stock turbos, you'll find that there isn't much to gain (and a whole lot to lose) when advancing timing beyond a certain point. It's only when running E85 can you support big ignition advance numbers.

Shiv

[OpenFlash]

Originally Posted by Dark9T

Shiv, my OpenFlash real time data not working properly, it wouldn't connect.

Correct. Currently, it will only work if Procede is in Map0 and with Canclear OFF (CAN disabled).

[Dark9T]

Originally Posted by shiv@vishnu

AFR bank 1 and 2 are pretty much even. I think you mean Fuel trim which is always going to deviate when running methanol injection (unless you mount the nozzles way upstream in the FMIC end tank). Adjusting open loop fuel doesn't make the setup run richer or leaner. All it does is raise/lower the fuel trims. And you're trims aren't anywhere close to reach their limits so I'd leave it alone. To make the car run richer/leaner you will need to change the values in the AFR offset table. But I wouldn't do that arbitrarily. That stuff is best left for doing on the dyno as the butt dyno is pretty insensitive when we start talking in this small of a scale.

You're timing is pretty solid. I wouldn't adjust it upwards without some sort of dyno tuning. With stock turbos, you'll find that there isn't much to gain (and a whole lot to lose) when advancing timing beyond a certain point. It's only when running E85 can you support big ignition advance numbers.

Shiv

got it, thank you shiv!!
anyway i am gonna get a dyno tune from you guys soon..

[OpenFlash]

Originally Posted by Dark9T

got it, thank you shiv!!
anyway i am gonna get a dyno tune from you guys soon..

[Ilma]

If it's any comfort, here is one of my datalogs on meth.

I have been trying to eliminiate the fuel trim variance and moved my meth nozzles to the up-pipe coming out of the intercooler......but it didn't make any difference to the trims.

I guess the next step would be to tap the intercooler end tank and move the nozzles there.

Shiv.....given my fuel trims are equal when I don't spray - is it pretty certain that moving the nozzles to the endtank will help equalize the imbalance when I do spray?
.
.
.

[Dark9T]

Originally Posted by Ilma

If it's any comfort, here is one of my datalogs on meth.

I have been trying to eliminiate the fuel trim variance and moved my meth nozzles to the up-pipe coming out of the intercooler......but it didn't make any difference to the trims.

I guess the next step would be to tap the intercooler end tank and move the nozzles there.

Shiv.....given my fuel trims are equal when I don't spray - is it pretty certain that moving the nozzles to the endtank will help equalize the imbalance when I do spray?
.
.
.

did you use E85 mix?

[Tzu]

Yikes, 80% WGDC to hold 12psi? I suppose if your tuner says it's fine, it must be true

[OpenFlash]

Originally Posted by Tzu

Yikes, 80% WGDC to hold 12psi? I suppose if your tuner says it's fine, it must be true

OP lives in Vegas. Altitude + heat = high WGDC
Logs from Colorado customers are even more outlandish looking.

[Dark9T]

I wish I live in California!! Haha

[Dark9T]

Car was running fine till today, was driving slow and got a limp mode with two code,
10722 Fuel injection rail, pressure sensosr signal and 10927 Fuel pump plausibility.. Please help!!

[OpenFlash]

Originally Posted by Dark9T

Car was running fine till today, was driving slow and got a limp mode with two code,
10722 Fuel injection rail, pressure sensosr signal and 10927 Fuel pump plausibility.. Please help!!

What Open Loop fuel value are you using?

[Dark9T]

Originally Posted by shiv@vishnu

What Open Loop fuel value are you using?

OL fueling on the procede setting is 30%..

[Dark9T]

Uploaded with ImageShack.us

i just change back to the Aggressive v5 9_10 map, was using the E85 map but need some logs tonight and need to change my LPFP before do the e85 map again..

[Dark9T]

Uploaded with ImageShack.us

this log is from map1 no math, some how my meth wont flow last night..
how to fix this fuel trim on bank2? my OL fueling was 50%.

[OpenFlash]

Originally Posted by Dark9T

Car was running fine till today, was driving slow and got a limp mode with two code,
10722 Fuel injection rail, pressure sensosr signal and 10927 Fuel pump plausibility.. Please help!!

If this happened while you were just driving slowly, you may be experiencing the early signs of HPFP failure. I wouldn't worry about it unless it happens again. Also, from now on, all Debug Byte 4 to your datalogs. That will show the fuel pressure signal that goes to the DME.

[OpenFlash]

Originally Posted by Dark9T

Uploaded with ImageShack.us

this log is from map1 no math, some how my meth wont flow last night..
how to fix this fuel trim on bank2? my OL fueling was 50%.

That log looks beautiful in every way. I'm not surprised to see fuel trims even out when meth isn't spraying. A 7% deviation is nothing. I wouldn't change a thing.

[Ilma]

Originally Posted by shiv@vishnu

That log looks beautiful in every way. I'm not surprised to see fuel trims even out when meth isn't spraying. A 7% deviation is nothing. I wouldn't change a thing.

+1

A 2% to 5% fuel trim deviation between banks is pretty normal when not spraying meth.

Important point is that your AFR's look good between banks and that indicates the injectors are meeting their targets.

One bank just needs a little more fuel to do so.

[Dark9T]

Right after I switch to the map4 meth map and check engine light start flashing..