Trying to figure out MAF scaling
 

I am not sure I even need to scale as I am almost always under 5% LTFT. There are a few times that i go into the low 6's but its my understanding that this can be normal?

I have an INJEN cold air intake that came with the car when i bought it, so going back to stock is not an option.

I am just wanting to run an OFT stage 1 tun for now, and perhaps play around with a the ethonol tune, but I have been told that I can hurt the car if i dont figure out my MAF scaling prior to putting any tunes on the car.

I have two logs I can share if anyone could point me the right direction on how to upload them. One is a very spirited driving session, and the other was my normal daily drive on my way into work.

So i guess i am trying to figure out mostly if i even need to change my MAF scaling prior to putting on a stage one tune, and then if i do, a little help figuring that process out.

Car is a 2013 FR-S

Start with this thread and all the threads in @steve99's signature.

http://www.ft86club.com/forums/showthread.php?t=71157

None of that really applies to the questions I asked. I appreciate the attempt though.

I have also been through the MAF scaling thread, which doesn't directly address the questions I asked either.

My LTFT's are averaging under 3. it occasionally bumps up to the low 6's with what i understand to be heavy throttle use, but then drops back down. I do not have a check engine light on either.

Its my understanding that this is well within the accepted range, but i am wanting to comfirm that this is the case and i am OK to add the stage one tune.

Which specific question wasn't answered? Depending on what tune you flash it will likely have a new MAF scale anyway.

I would like to post my logs, so they can be viewed, to know for sure that its safe to flash stage one w/out rescaling the MAF. Ill collect data logs from there and try and tweak it but figuring that out right now is proving to be very difficult.

I am also not sure that my logs are showing a need to even rescale the MAF to begin with.

I thought in one of @steve99's links he talked about how to post logs.

Everyone here posts them on datazap. http://datazap.me

Register for an account and then upload the logs. If you look in the tuning sub-forum you'll find some examples.

https://datazap.me/u/igw/log-1506021668?log=0&data=1-13

https://datazap.me/u/igw/log-1506021448?log=0&data=1-13

If you're primarily looking at LTFT instead of AFR, then you totally and utterly missed the point making any changes in the first place (that goes for everyone else too). And we have to assume this is true because you only mention LTFT in your post and not AFR.

Answer: it's pointless waste of time to start on the stock tune.

Correct, I am struggling to comprehend everything that is at play and what I need to do.

That was what I thought the benefits of the OFT were, that it was plug and play and get the tune, and allow myself to run E85 at times also.

If its safe to put on stage one then do data logging that would save the whole step of doing it on the stock tune.

Then again, perhaps i am just daydreaming that i will be able to get past this learning curve all together, and in a safe mannor. That 250 bucks for the custom tune seem a whole lot more appealing now.

Is it unsafe to run stage one?

Read the guide mentioned above, it will tell you what parameters to log and how to drive for a good log (3rd gear pulls which are missing from your current logs), flash the tune, take a log and the data will tell you what you need to know. Ive already know of two guys that went back to stock intake afterwards (I'm one of them) so be prepared, data doesn't lie :p

If i find a way to cheaply and easily go to a stock intake, i would. The car came used with this intake so i am stuck with it.

I guess i am still at the point where i need hand holding. you are the second person to tell me i need to log certain things, but am not sure how to make that change.

I'm sure youll find someone willing to swap, maybe even with cash on their side. But first take that log on the current intake, maybe it's not that bad. My friend had a stage 2 tune with kn intake, that one was really worse, ltft values looked fine but it ran leaner than the sensors could measure (also on stock tune)

Watch the video's from Shiv too, it will teach you pretty much everything. https://youtu.be/jrAC6v8GSE0

Do you mean take the 3rd gear pull log? As in from a stop start out in 3rd gear and run it up as hard as i can?

Be more resourceful. There has to be someone in your area more foolish who will part with an entire stock intake system for next to nothing, there always is.

Yes, that video helped tremendously.

What are the parameters i need to measure for this?

http://www.ft86club.com/forums/showthread.php?t=94822

Waynos guide will show you everything you need to do, also he offers pretty perfect tunes for the car.

I have reached out to him.... Looks like about 45 bucks for a modified stock tune.... Not horrible... But i also want to run e85 from time to time just to have some fun... Flex fuel probably being the better route for me.

however, i would still like to flash the stage one, and grab some 3rd gear pulls... Can you please explain that how to do those?

It also seems that waynos guide allows you to purchase some adjustments that you still have to make yourself, which as of right now is the point in which i am struggling.

I can, but not as good as wayno did in his guide.. 0.7 and 0.8 / step 1

Log your OTS tune in 3rd gear with you foot flat to the floor from 2000 rpm to 7300 rpm.

So start out in first just like normal, grab second, then third before hitting 2000 RPMs then floor it to 7300?

I'm in the exact same boat as you, bought a 2013 FR-S used that had an Injen CAI on it. I have an OFT arriving Monday, I'll have to figure this all out too.

But that's hitting very illegal territory :)

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3rd gear on my auto from 2000 to 7300 rpm is gonna reach VERY illegal speeds 🙄


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Riccird1: that's what drifting for. You can redline 4th while going within legal speed :D

Top speed in 3rd gear on a stock manual is only 83mph. That's only 3mph over the tollway speed limit here in Austin...

It’s about 93-95 mph (151 km/h) on third gear in the auto. Max legal speed where I live is 50 mph (80 km/h)


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Ah yes, autos have taller gearing.

Google “Yikes maf scaling spreadsheet” and read up on it. Should be on the rom raider forum I believe.

Gonna try it myself when I get my 3” Perrin Bigmaf with a forester MAF. Good reviews on it to get close to where you need to be


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