Data Logs! Post them here.

[solidONE]

Originally Posted by Kodename47

It's going lean due to the load limiters, if you raise the load limits but want to keep target fuel and timing the same then just copy the 1.0 or 1.1 load values across in the respective tables. That way you might get the fueling from the MAF without the daft drop in AFR target and timing that the stock tables have.

I've actually done this with my E85 rom (see the bottom load limit table above) and was only able to bring down the afr at that spot to around 14.6 by increasing load limit to 1.3 g/rev. Which is why I'm asking whether if there are any other tables I should be looking at to adjust besides backing out the cam timing to address that lean spot at 2260rpms.

http://datazap.me/u/solidone/plm85g-...2213&mark=2098

Now, it doesnt seem to be causing any knock and another thing is that, beside while taking these logs, under no other circumstance would I go WOT at any time at such a low RPM. Then maybe it's not such a big deal, I'm thinking. Also, what's the daft drop in the stock timing and afr target you speak of? Perhaps I need to address it on those OL fueling and ignitin advance table as well?

[Kodename47]

Originally Posted by solidONE

I've actually done this with my E85 rom (see the bottom load limit table above) and was only able to bring down the afr at that spot to around 14.6 by increasing load limit to 1.3 g/rev. Which is why I'm asking whether if there are any other tables I should be looking at to adjust besides backing out the cam timing to address that lean spot at 2260rpms.

Things to look at:
Tip in
Load Limits
MAF Scale
OL Fuel Table

It is worth considering that if there is a large amount of overlap then there is the potential that the AFR at the sensor is leaner than the actual cylinder AFR.

Originally Posted by solidONE

Now, it doesnt seem to be causing any knock and another thing is that, beside while taking these logs, under no other circumstance would I go WOT at any time at such a low RPM. Then maybe it's not such a big deal, I'm thinking. Also, what's the daft drop in the stock timing and afr target you speak of? Perhaps I need to address it on those OL fueling and ignitin advance table as well?

You are correct that if it's not causing you an issue then it's not crucial to fix. I always like to prove mine down to 2.5-2k. You could always try and richen it out by using the OL fuel table. If in doubt, look to the stock tables for reference.

When I reference the large drop in timing and AFRs on the stock tables, just compare the tables to the load limits and you'll see that there's a large region in the top right of both timing and the OL Fuel tables that is never looked up. If you set those cells to the value that the load limits stop at then you could raise the load limits completely and then set them to correct any fueling error. I knocked together a spreadsheet to work that out:

Load Limit Value Calculator

[solidONE]

Originally Posted by Kodename47

Things to look at:
Tip in
Load Limits
MAF Scale
OL Fuel Table

It is worth considering that if there is a large amount of overlap then there is the potential that the AFR at the sensor is leaner than the actual cylinder AFR.



You are correct that if it's not causing you an issue then it's not crucial to fix. I always like to prove mine down to 2.5-2k. You could always try and richen it out by using the OL fuel table. If in doubt, look to the stock tables for reference.

When I reference the large drop in timing and AFRs on the stock tables, just compare the tables to the load limits and you'll see that there's a large region in the top right of both timing and the OL Fuel tables that is never looked up. If you set those cells to the value that the load limits stop at then you could raise the load limits completely and then set them to correct any fueling error. I knocked together a spreadsheet to work that out:

Load Limit Value Calculator

That was what I was thinking as well. Very good point.

I'd also like to note that the max loads seen with the 91 octane seems to be a bit lower than with E85. Not sure if ignition advance as something to say about the lower loads or if it's just the higher octane of the E85 compared to the petrol. Probably a bit of both. I set up the load limits according to the log and it looks quite different than what I set for the E85 rom.

[username404]

Hi again,

After resetting the ECU, I was able to log 3 files today with the parameter as suggested.

Thank you!


Drive 1
http://datazap.me/u/username404/1029-drive-1


Drive 2
http://datazap.me/u/username404/1029-drive-2


Drive 3
http://datazap.me/u/username404/1029-drive-3

[solidONE]

^ that's a lot of fuel trim.

[username404]

Originally Posted by solidONE

^ that's a lot of fuel trim.

Yep that's what I was told. Not sure if the leak is at the manifold where BPB are installed or Headers or Headers & OP.

I got new gaskets from GrimmSpeed for both end of the OFH. Not sure how to reseal the BPB or just remove them.

All suggestions are appreciated. Thanks!

[solidONE]

Originally Posted by username404

Yep that's what I was told. Not sure if the leak is at the manifold where BPB are installed or Headers or Headers & OP.

I got new gaskets from GrimmSpeed for both end of the OFH. Not sure how to reseal the BPB or just remove them.

All suggestions are appreciated. Thanks!

I've no experience with the Crowford BPB, but just because you got new gaskets does not automatically mean you have no leak. See what the guys that have been helping you have to say.

[username404]

Originally Posted by steve99

no need to reflsh the ecu constantly learns.

of you just want to reset ecu to clear codes jist remove battery terminal then press brake to bleed of any residual power and reconnect battery.

Hi again,

After resetting the ECU, I was able to log 3 files today with the parameter as suggested.

Thank you!


Drive 1
http://datazap.me/u/username404/1029-drive-1


Drive 2
http://datazap.me/u/username404/1029-drive-2


Drive 3
http://datazap.me/u/username404/1029-drive-3

[solidONE]

^ Is the tune you are using intended for your setup? For use with the BPB? While the fuel trims do till look a bit high, under load it's not horrible maybe +3~8%, but once your idling it will shoot up to +12%. Seems to indicate some sort of leak, but it could possibly be a really poorly matched MAF scale to your setup. I remember seeing a log with a perrin intake using perrin's supplied MAF scale that looks even worse than yours.

If you dont know how to find a leaks in your intake or exhaust, Id suggest you take it to a mechanic that does to make sure there aren't any leaks.

For intake vacuum leaks you can shoot some carb or brake cleaner around intake connections that are suspect while idling. If the rpm go up, then you have found a intake leak.

For exhaust leaks you can fill a squirt bottle with soapy water, and with the help of another person shoot the exhaust connections with the water as they lightly press on the throttle and bring up the engine revs. If you see the water you shoot on the connections bubbling, then you have found an exhaust leak.

There are many other, perhaps better ways, to find leaks in the intake and exhaust. those are the first methods I use since I will have carb and brake cleaner laying around anyway. If there are no leaks found, then its probably safe to say that the maf scale is off by a good margin. Hope this helps.

[username404]

Originally Posted by steve99

could be.

if you have exhaust leak near or before o2 sensors the sensor will see some fresh air which contains far more oxygen than the exhaust gasses, the sensor then signals a lean condition to the ecu, so the ecu adds more fuel trying to correct thge perceived lean condition.

but these cars like most get crap fuel economy in traffic compared to open road or highway

Just done with leak testing with smoke and found no trace of leak anywhere in the engine bay.

What should I do as next step? Just the gaskets anyway? Or Contact Open flash?

Thanks!

[steve99]

Originally Posted by username404

Just done with leak testing with smoke and found no trace of leak anywhere in the engine bay.

What should I do as next step? Just the gaskets anyway? Or Contact Open flash?

Thanks!

if your confident their are no leaks and your trims are less than about 10%, its possible its just maf scaling errors causing it. Its just you dont want to start scaling maf if you have intake of exhaust leaks.

It not unusual for even stock cars to have 8% or so trims even on petrol

If its like 15% then that generally indicates a bigger problem.

[username404]

Originally Posted by username404

Alright I'll it tomorrow. Thanks!

Found the issue. Cracked at OP and FP. Just replaced with Nameless catless resonated downpipe. Hopfully new logs should show better results.

Originally Posted by steve99

no need to reflsh the ecu constantly learns.

of you just want to reset ecu to clear codes jist remove battery terminal then press brake to bleed of any residual power and reconnect battery.

[solidONE]

^ ewww... Not so sure changing that out will make much a difference to fuel trims though, since it's a bit downstream form the O2 sensor. But who knows? I've seen weirder shit before.

[username404]

Originally Posted by steve99

no need to reflsh the ecu constantly learns.

of you just want to reset ecu to clear codes jist remove battery terminal then press brake to bleed of any residual power and reconnect battery.

Stock OP+FP replaced with Nameless Catless Resonated DP and New Log after the reset.

http://datazap.me/u/username404/nov-...log=0&data=1-9

Better?