OFT idle rattle
 

Hey guys,

I'm located in Australia and recently purchased an OFT and running the Stg1 A01G-AU LC48 tune.

Today I noticed a slight rattle sound coming from the engine during warm up idle, kind of like a tapping sound. I grabbed my OFT and logged the data and noticed that knock correction sat at 0 and IAM at .88

I have no background in tuning so I'm a noob to all this.. I was wondering if this is normal behaviour running our cars on a tune or should I look into this further?

I have a Takeda intake installed and I run Shell 98 fuel if this helps. I've also logged the data which you can access here: http://datazap.me/u/virtua86/slight-...data=1-3-10-11

Hope this help. Thanks in advance.

Glenn.

Unlikely the rattle sound at idle is knock it more likely the injectors and fuel pump.

Our 98 RON fuel is not as good at the 93 AKI MON fuel in the USA and we get knock in the 2000-3500rpm area wich if you get enough of it it will drop your IAM to less than 1 as you have found. Note if you logged your stock tune it will be worse and IAM likely 0.7 or so.

see another one of your logs here

http://datazap.me/u/virtua86/datalog...og=0&data=1-11

The raspy noise around 4k is due to aggressive VVT settings to counteract torque dip

If you have installed an aftermarket intake you will also likely need to rescale you maf sensor as the intake will have different flow characteristics than the stock intake and will throw off your fuel trims and your AFR.

Instead of logging VVT Exhaust and VVT intake log Fuel system status and LTFT if you LTFT are consistently over say 5% then a maf rescale will likely help.

however your lucky as most of the work has been done for you

load up tune at end of this post and you will be close to done (other than you owe me a beer :D )

http://www.ft86club.com/forums/showthread.php?t=61820





Your intake may upset fueling a bit and need a maf scale if so check out the post below



http://www.ft86club.com/forums/showthread.php?t=64790

have fun !



You can get you IAM back to 1 on the standard OFT tune by doing a couple of light throttle runs up to 4500rpm or so and it will come up to 1 but as soon as you start on/off throttle stuff in traffic low rpm high gear it will go back down again untill you pull a bit of timing out of the map

Thanks Steve for the helpful info. Rescaling my MAF is something I wouldnt be comfortable since I've never tuned a car before and have absolutely no experience in this kind of stuff.

I'll look into those links you provided and fingers crossed I don't blow my motor :)

As far as beer goes, mate you gotta deal!!

Cheers,

Glenn.

Steve can I throw some questions at ya mate..

If i have to rescale my MAF how do i obtain the info needed to rescale it? Is it as simple as emailing the manufacturer?

The tune file you have at the bottom of this post, is it saved for aftermarket intakes or is it the latest tune file update? http://www.ft86club.com/forums/showthread.php?t=61820

Cheers..

The manufacturer may have some maf scaling info for their intakes perrin do but others may not it would be worth a try.
If you log your long term fuel trim if it stays less than about 5 percent then you can skip scaling maf , if ltft is varing widly and say 10 percent in places then a maf scale would be benificial

All 1.5x oft tunes are the same they just added extra rom support for different countries with each revision, but G version tunes no change.

So the one at end of that post is fine for aussie G rom ie manual you can just load it in oft and flash it, unzip it first :)

The oft guys will be releasing v1.6 tunes soon and these will have both 91 and 93 octane versions, the 91 versions may be better suited to our fuels

If you need to rescale maf you just need to log some easy driving for about 30 minutes and three 2000 to 7000 runs and input the data into vgi,s maf scaling program

Where can I get the maf scaling program?

Sent from my C6903 using Tapatalk

It is the thread right under yours at the moment.

Its linked in this post

http://www.ft86club.com/forums/showthread.php?t=64790

direct link here to VGI post on RomRaider

http://www.romraider.com/forum/viewt...p?f=32&t=10481