Open Flash Tablet - OFT TIPS Trick’s & FAQ

[guybo]

Originally Posted by JW843

Would there be any reason for me to scale MAF settings when running on a catless header/stage 2 OTS tune with stock intake? I had a grimmspeed intake on, took it off, and i'm still getting odd values. i have high LTFT at idle and low RPM's/throttle. I have very random STFT spikes, and command AFR and recorded AFR can differ quite a bit. I've cleaned the MAF sensor but no changes were noticed. any thoughts?

Make a thread on this. High positive fuel trims at idle usually means vacuum leak or a prob with a catch can. But it can be other things like header gaskets. Don't scale your MAF or make tuning changes until you take care of this problem.

[steve99]

Originally Posted by allowe

I still have cat, Evap and oxygen sensors not ready but when I floor it at 6th gear with low revs (very low) the car doesn't go up in speed at all


I tuned it to stage 1 91 yesterday and turned on LC.

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yes as Tor said not good to lugg car but the problem you describe can also occurr in 1st gear its due to an error in setting load limits in some tunes.

look at load limit table and make sure its not set all above 1.5 , set them as per a stock tune

[steve99]

Originally Posted by JW843

Would there be any reason for me to scale MAF settings when running on a catless header/stage 2 OTS tune with stock intake? I had a grimmspeed intake on, took it off, and i'm still getting odd values. i have high LTFT at idle and low RPM's/throttle. I have very random STFT spikes, and command AFR and recorded AFR can differ quite a bit. I've cleaned the MAF sensor but no changes were noticed. any thoughts?

The Grimspeed intake is very close to stock maf scaling wise, you should not need to re-scale maf.

Dont worry about STFT it will vary widly with throttle application and load.

Just look at LTFT which is the average of STFT over time.

If you ltft is way positive at low rpm and good averywhere else its usually an indication of a leak in intake or exhaust

as @guybo said if this has just occurred then check for leaks or other issues dont just rescale maf to cover over another possible issue

[JW843]

Originally Posted by steve99

The Grimspeed intake is very close to stock maf scaling wise, you should not need to re-scale maf.

Dont worry about STFT it will vary widly with throttle application and load.

Just look at LTFT which is the average of STFT over time.

If you ltft is way positive at low rpm and good averywhere else its usually an indication of a leak in intake or exhaust

as @guybo said if this has just occurred then check for leaks or other issues dont just rescale maf to cover over another possible issue

Yeah I've swapped out the gaskets for new ones on the header, assuming the leak would be somewhere on there near the o2 sensors. No changes, still consistently LTFT up to 9%. Checked the intake pretty throughly and can't find any leaks. Any other common suspect areas to check? Also, it's a v1 borla uel which is known to have some issues. I don't see any spots along the header but who knows.

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[steve99]

Originally Posted by JW843

Yeah I've swapped out the gaskets for new ones on the header, assuming the leak would be somewhere on there near the o2 sensors. No changes, still consistently LTFT up to 9%. Checked the intake pretty throughly and can't find any leaks. Any other common suspect areas to check? Also, it's a v1 borla uel which is known to have some issues. I don't see any spots along the header but who knows.

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is that +9% at idle then whats ltft at higher rpm still positive ?

are you on straight petrol or 10% ethanol ?

[JW843]

Originally Posted by steve99

is that +9% at idle then whats ltft at higher rpm still positive ?

are you on straight petrol or 10% ethanol ?

Idle fluctuates a bit usually closer to 3 to 5%, the 9% is pretty consistent at low throttle cruising. I've got a graph of it in the data logs thread that was posted pretty recently

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[steve99]

Originally Posted by JW843

Idle fluctuates a bit usually closer to 3 to 5%, the 9% is pretty consistent at low throttle cruising. I've got a graph of it in the data logs thread that was posted pretty recently

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mate if its this log here

http://www.datazap.me/u/jwiggins864/...7?log=0&data=9

it doesnt look like a leak to me usually with leaks you getvthe most effect at low rpm\flow rates then as rpm increases the effect ofcthe leak is less and the ltft trend to normal values.

id expect rearly high ltft at idle and very low rpm if it was a leak

you have +2 at idle then a spike to +9 arround 3000 then back to +2 again at higher rpm.

looks like your safe to just scale the maf if you need too

[guybo]

I wouldn't worry too much about +9 LTFT at idle. I thought you meant high as in 20 or more

[MurderousPandas]

Originally Posted by guybo

I wouldn't worry too much about +9 LTFT at idle. I thought you meant high as in 20 or more

Fuel trims combined shouldn't be any more than +/-5%, if it is, it should be looked into. It's probably okay, but for longetivity and reliability, and to improve performance and mpg, i would look into it.

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[allowe]

Originally Posted by steve99

yes as Tor said not good to lugg car but the problem you describe can also occurr in 1st gear its due to an error in setting load limits in some tunes.

look at load limit table and make sure its not set all above 1.5 , set them as per a stock tune

How can I look at that table? Thru romraider? What would it be under in rom raider, I can't find it.

EDIT: I found it, it's 4 maximum but my stock tune has 0 maximum


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[steve99]

Originally Posted by allowe

How can I look at that table? Thru romraider? What would it be under in rom raider, I can't find it.

EDIT: I found it, it's 4 maximum but my stock tune has 0 maximum


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arrh no not that one , think you have a bad definition dont change that

its the load limit tables see here not the A01G rom is correct steady rise from about 0.8 to 1.3 and the B01C all very high can cause bogging at low rpm large throttle input

Let me know you rom id and ill send you the correct definition or just post up your rom and ill fix it for you

[allowe]

Originally Posted by steve99

arrh no not that one , think you have a bad definition dont change that

its the load limit tables see here not the A01G rom is correct steady rise from about 0.8 to 1.3 and the B01C all very high can cause bogging at low rpm large throttle input

Let me know you rom id and ill send you the correct definition or just post up your rom and ill fix it for you

Thanks a lot man I just sent you my tune file via pm

Also, could it be that it's driving like crap because my oxygen sensor, Evap and cat systems aren't "ready" yet according to dashcommand

Note: I also have an injen intake. That could also be a factor im guessing. I also unplugged my battery 2 days ago to install my amp.


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[steve99]

Originally Posted by allowe

Thanks a lot man I just sent you my tune file via pm

Also, could it be that it's driving like crap because my oxygen sensor, Evap and cat systems aren't "ready" yet according to dashcommand

Note: I also have an injen intake. That could also be a factor im guessing. I also unplugged my battery 2 days ago to install my amp.


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If your header is stock, then the most likely cause of rough running/bogging is the injern intake. Check for leaks and that maf installed correctly and the gasket under maf is not creased or torn.


but its likely your going to have to scale maf with the injen intake

[guybo]

My Injen intake causes rough idling. At idle my LTFT is way off, but as soon as I touch the gad pedal it smooths out and the LTFT is fine. I need to get my MAF rescaled. Right now is a bad time though, so it has to wait and I just keep on the gas a little when I idle in traffic. It's not a big deal really.