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Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB (https://www.ft86club.com/forums/index.php)
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-   -   OFT Unstable revs when shifted to R/D from Parking (https://www.ft86club.com/forums/showthread.php?t=139501)

powerwdp 03-21-2020 08:24 PM
OFT Unstable revs when shifted to R/D from Parking
 
1 Attachment(s)
Hi I got a 2018 toyota 86 auto recently added JDL catted UEL and OFT tune (Stg-2-v4.03-ZA1JN10D.bin). But after that I found every time after cold start, if I don't let the car fully warmed up, the rev will rise to 2000+ immediately after switching to R/D and then be quite unstable when I releasing the brake.

It make some trouble when I want to move preciously in the garage, just want to know is there any solution for that? I attached a video and the tune file I've used. You can see from the video that I never touch the throttle but the rev is keeping bouncing...

[ame]https://www.youtube.com/watch?v=IlqecsbqOEw[/ame]

kev0 03-21-2020 09:32 PM
How many miles since the tune? If less than 200, check back in after you reach those 200 miles so the fuel trims are fully learned. Post a log if you can. A vacuum leak in the header can cause that.

steve99 03-22-2020 07:48 AM
Maf correction after start values are incorrect in both in nrutral and in gear tables.


Ive fixed this for a few people

powerwdp 03-22-2020 11:47 AM
Quote:
Originally Posted by kev0 (Post 3311524)
How many miles since the tune? If less than 200, check back in after you reach those 200 miles so the fuel trims are fully learned. Post a log if you can. A vacuum leak in the header can cause that.
it is pretty new with new gaskets, should be under 50 miles, I'll check back later.

powerwdp 03-22-2020 11:48 AM
Quote:
Originally Posted by steve99 (Post 3311609)
Maf correction after start values are incorrect in both in nrutral and in gear tables.


Ive fixed this for a few people
I did some research and found below part may be the one you mentioned.

Code:
                <table name="MAF Correction After Start (Neutral)" storageaddress="11C868">
                  <table type="X Axis" storageaddress="11C81C" />
                  <table type="Y Axis" storageaddress="11C848" />
                </table>
                <table name="MAF Correction After Start (In Gear)" storageaddress="11C964">
                        <table type="X Axis" storageaddress="11C918" />
                        <table type="Y Axis" storageaddress="11C944" />
                </table>
Can I rewrite the address using the stock value to fix that? Not sure if that will works properly with aftermarket parts...

Thanks!

steve99 03-23-2020 02:53 AM
Quote:
Originally Posted by powerwdp (Post 3311637)
I did some research and found below part may be the one you mentioned.

Code:
        <table name="MAF Correction After Start (Neutral)" storageaddress="11C868">
          <table type="X Axis" storageaddress="11C81C" />
          <table type="Y Axis" storageaddress="11C848" />
        </table>
        <table name="MAF Correction After Start (In Gear)" storageaddress="11C964">
            <table type="X Axis" storageaddress="11C918" />
            <table type="Y Axis" storageaddress="11C944" />
        </table>
Can I rewrite the address using the stock value to fix that? Not sure if that will works properly with aftermarket parts...

Thanks!

The def is correct just the values in table are in correct . You just need to change the valies in the tables in romraider.





Use the values in the maf after start tavles at bottom of the picture below ie the tavles with max value 20, copy in the whole table to your tune, make both in gear and in neutral same





http://www.ft86club.com/forums/attac...1&d=1442115672

powerwdp 03-23-2020 05:26 PM
Quote:
Originally Posted by steve99 (Post 3311854)
The def is correct just the values in table are in correct . You just need to change the valies in the tables in romraider.





Use the values in the maf after start tavles at bottom of the picture below ie the tavles with max value 20, copy in the whole table to your tune, make both in gear and in neutral same





http://www.ft86club.com/forums/attac...1&d=1442115672
Thanks for the information!

I've downloaded romraider and check my value, it looks a little bit different. The value is higher for idle mode 7/8 and has a low-high-low trend for in gear table.

should I make the in gear table exactly same as neutral table or keep its trend but lower the number?

https://i.imgur.com/5j5L0YP.png

steve99 03-23-2020 07:18 PM
Just make fhe in gear an neutral tables same, that way when you shift from neutral to a gear the rpm wont change


From memory ghe original tavles had higher values at bottom rows which made rpm rise more as car warmed up

powerwdp 03-23-2020 11:20 PM
Quote:
Originally Posted by steve99 (Post 3312066)
Just make fhe in gear an neutral tables same, that way when you shift from neutral to a gear the rpm wont change


From memory ghe original tavles had higher values at bottom rows which made rpm rise more as car warmed up
Just want to confirm that I haven't done something wrong...:thumbup:

https://i.imgur.com/JsoSFFK.png

steve99 03-24-2020 04:42 AM
Swap rows 1,2 with 7,8 in both tables


Tats whats causing issue

powerwdp 03-24-2020 03:22 PM
Quote:
Originally Posted by steve99 (Post 3312161)
Swap rows 1,2 with 7,8 in both tables


Tats whats causing issue
That solved the problem, I really appreciate it!

Can you describe a little about difference between row 1/2 with 7/8? Not sure why they switch those row for later map.

steve99 03-25-2020 02:39 AM
Quote:
Originally Posted by powerwdp (Post 3312271)
That solved the problem, I really appreciate it!

Can you describe a little about difference between row 1/2 with 7/8? Not sure why they switch those row for later map.

The ecu runs through thte rows in order from 1-8 , over the warm up period


I think they just made a mistake when the made the tune

powerwdp 03-27-2020 10:27 AM
Quote:
Originally Posted by steve99 (Post 3312545)
The ecu runs through thte rows in order from 1-8 , over the warm up period


I think they just made a mistake when the made the tune
The starting idle rev is a little bit low, I just rise it to 20/16/16/15/12/9/x. Hope that will work properly.:w00t:

tomm.brz 03-27-2020 11:31 AM
in those tables, the first 2 rows do not set the idle rpm, mostly just the initial throttle blip behaviour
rows 3-8 best to keep them stock for warm/hot start stability


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