Car seems to be pulling timing with OFT v4.03 Stg1
 

Hello folks,

I've flashed the OFT v4.03 ROM onto my car about a month ago and been daily driving it since. I've only recently started to datalog because the butt-dyno said things felt a little off.

I checked my IAM today and it was pegged at 0.56 the whole time. I'm seeing knock correction come on at certain times too, plus my LTFT varies between -6.5% and -3.9%. I tried the second gear run from ~2000 rpm to about 7000rpm at ~30% throttle hoping I could get the IAM up a little, but saw no chance. I also saw knock correction kick on around 3000rpm during that run. I did see IAM at around 0.76 last night, but I can't be 100% sure. Even after a restart of the car, the IAM stays at 0.56 - which is expected behaviour from reading other threads.

I'm using Shell 91 in Canada. The car definitely feels slower and less responsive than stock to me. Any idea what might be wrong? I feel like it might be a case of a batch of bad fuel, but I'll have to wait until I empty this tank to verify that. Car is stock except for a high flow air filter.

Here are two datalogs that might help:

https://datazap.me/u/rb28dett/low-iam-1?log=0&data=1-13
https://datazap.me/u/rb28dett/low-iam-2?log=0&data=1-10

Many thanks in advance for any help :) I might try re-flashing the stage 1 tune again and seeing if anything changes.

EDIT: Something a little odd to me as well. My car is a MY15 MT FRS with a calibration ID of ZA1JD00C, but on the OFT website there's no matching tune. The only file for JD00C is for a MY14 (not 15) which is what I've flashed. I'm not sure if that is what is causing the issues. Also I've never been able to get FFS to work (it just bounces off the full rev limiter) even though LC works.

Screen shot of my Openflash Manager included as an attachment.

I flashed the ROM with FW version 1.51, but the OFT just updated itself to 1.53. I'm not sure what the changes are between them and if I should re-flash.

Yes with 91 fuel on v4 tunes the iam is unlikely to ever be 1 and you will always have some knock


I could modify tune for you to run better on 91


Message me if your interested

Just a quick note. You didn't blur out the S/N on the top

Thanks, fixed :)

yeah. seem like the my car is not as responsive with the 4.0 stage 2 plus update. I am thinking switching back to the older Stage 2OFH v1.0.

Steve,

Is there a 4.0 stage for the openflash headers I can download?

i would love a 91 specific tune!

[jack]Best username ever.[/jack]

If that was meant for me, thanks :party0030:

I am also curious, I’ll pm you

Is it always better to run 93+ on Stage 1 on 4.03 to reduce knock?

I'm also a little curious as to what kind of power loss there is between running 93+ and just 91 on these tunes. Especially if the car is pulling 30% of the timing at 91.

am at 0.7 doesnt mean 30% of the timings is pulled
it s 30% of The ignition advance map (Knock correction A)
we are talking of maximum 3 degrees of timing so dont Know,something less than 10-12cv probably

Ahh thanks for the clarification. That makes perfect sense :)

I noticed the same thing. The tune says it's for a MY14 and my car is a MY15. I have the same calibration ID as you tooSent from my Pixel XL using Tapatalk

I found even the stock tune (2012 build date) on my car gets some knock on 91 (any brand) and the IAM never gets up near 1. I run only 94 through mine now and no knock at all on the v4 tunes.

My car would do the same thing on 91 with partial throttle pulls between about 2700 and 3700 rpm on the stock tune and off the shelf OFT tune. So basically during highway driving with any sort of acceleration without downshifting or even maintaining speed up a hill. If I ran the car hard and revved it out I could get the IAM up to 1. On a flexfuel tune and e85 its not an issue.

I switched to Husky 94 recently and it fixed the vast majority of the knock issues, except for when I'm trying to maintain speed uphill.

I did finally manage to hit an IAM of 1 with Husky 94 one day without any knock occurring, but I haven't managed to replicate it again.

If it knock in lower rpm range in closed loop mode


add a little more fuel via closed loop fuel tables A&B


pull a little timing in same area at rpm/load area before knock occurs and a little in the actual load/rpm range. Try to be smooth in your changes


remember you seeing the reaction to knock that already occurred

Looking at your log the IAM was at .56 thus means your car has been knocking and pulling timing.

Yep, thats correct. It hasn't dropped below 0.7 once I switched to 94 octane, and I've regularly been seeing 0.84 as well.

I'm interested! I would love to have a 91 specific v4 tune if that's possible.

Messaged you

I'd also be interested in this.

I didn't realize the v4 tunes were designed for 93. There isn't a single gas station in my area with anything better than 91...

@steve99,
Did you by any chance make a 91 octane OFT stage 1 v4 tune? I don't have anything above 91 octane in my area and not totally happy with the stage 1 tune, although I think it IS better than the stock tune.

Yes message me

@steve99
Can you please send me 91 octane,V4 as well. thanks alot.