OpenFlash Tablet v1.55b: BIN files added!

[Nardi330]

Originally Posted by s2d4

I doubt that is the issue.
What mods do you have, what fuel are you running this on?

perrin drop in filter + intake tube and Perrin header back.

running Shell 98ron.

thanks.

[Nardi330]

is your IAM at 1 during WOT?

thanks.

Originally Posted by steve99

I don't think there is any problem with the obd connection or the oft just would not log. log is fine but you look like you have been getting enough knock corrections to be dropping your IAM (ignition advance multiplier) from the normal condition of 1 to around 0.2 to 0.4.

This is not going to destroy an engine or anything but it is pointing to out aussie 98 RON is not as good as USA 93 AKI fuel for low rpm high load knock resistance.

as the engine is detecting knock at low rpm high load (city driving) is is reducing the IAM which retard the timing and robs engine of power so you don't get max benefit from tune.

When IAM drops below 1 it reduced the timing (knock correction) advance for the entire rpm range by in your case by 70 to 80 % this is probably pulling 2 to 5 degrees from you timing across the entire rev range.

Their are two options one is run higher octane fuel ie united 100 octane is about all we have in OZ or pull a bit of timing from the problem area which should keep your IAM up around 1.

I am currently running 100 octane and IAM was dropping slightly to 0.7 at worst and not very often. I modded by advance map in a few places only pulling -0.35 degrees and it solved the IAM drop now 1 when running 100 RON.

Will try on 98 once my tank runs down.

I can send you a ROM with the corrections if you want to flash it and try.

Or I can just send you the corrections and you can edit it yourself in RomRaider.

[steve99]

Originally Posted by Nardi330

is your IAM at 1 during WOT?

thanks.

Yes my IAM is 1 during wot runs and driving over 3500 rpm. you can monitor IAM real time with oft.

If you do a couple of easy pulls 4000 to 6000 you iam generally slowly recovers it can take a few times and a few minutes as the ecu needs to see no significant knock for a while before its starts bumping up IAM again. Its not an instant thing.

ECU see's a few significant knock event's in a given time it drops IAM , then if it does not see any more for a period it will start bumping it up back to one. (very simplistic view)

[steve99]

Originally Posted by Nardi330

did a quick log for normal city driving as requested by steve99.

http://www.datazap.me/u/nardi330/oft...4-6-7-10-11-12

i'm running 1.55 stage 1 A01G rom on Aussie spec manual 86.

it's not a 3rd gear WOT to redline pull.

any comment is appreciated.

Hi @shiv@vishnu

If you have a look his IAM is 0.2 to 0.3 he is on Australian shell 98 RON fuel.

Is does appear that aussie 98 is not as good as USA 93 for low rpm high load knock resistance.

Three of us now same issue, all ok WOT above 3500 once IAM recovers.

[steve99]

Originally Posted by Nardi330

perrin drop in filter + intake tube and Perrin header back.

running Shell 98ron.

thanks.

Are those perrin filters the type you oil ??

wonder if a bit of oil has got onto you MAF sensor, might be worth getting some maf cleaner spray and cleaning it ??

[Nardi330]

Originally Posted by steve99

Are those perrin filters the type you oil ??

wonder if a bit of oil has got onto you MAF sensor, might be worth getting some maf cleaner spray and cleaning it ??

yes oil type Perrin filter.

I will be fitting oil cooler soon so will look at the air box/MAF sensor then.

thanks.

[8686]

My log
http://www.datazap.me/u/haririmm/155...ata=1-5-6-7-11
I noticed that AFR goes rich after 5,000 rpm. Is this normal?
Mods are in the signature.

Thanks in advance

[troek]

most of us are going a little rich (high 11s) after 5k. especially with a fresh flash, ive been reflashing so much messing with my idle i havnt had time to see if mine has leaned out as the ECU learns or not.

[8686]

I have more than 200 miles after the flash and still. Mine goes to low 11s near 7000 rpm.


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[troek]

i would maybe look at customizing your tune, provided ur o2 sensors are reading your AFR accurately. i konw mine are as i data logged the stock tune so i had a baseline as what it ran OEM. a quick check would be to flash back to stock and see what it reads, youd have to disable the cat cel since you have a catless header.

[fenton]

I have a question for the tuning GURU's out there.

I am getting a OFT next week, now on to the backstory.

I started out with Ecutek, ran Visconti's tune. Then i got the Phantom ESC. With Ecutek i flashed back to my stock ROM. Once the ROM was stock my local tuner flashed a boosted ESC tune using BRZedit.

I still have this BRZedit tune configured on my car.

What do i need to do to get the OFT safely installed on my car? Should i flash back to "stock" with Ecutek with the understanding that my BRZ edit tune will be gone? Will that even work with a BRZ edit tune installed?
@shiv@vishnu seems like he might be the best to answer this but if anyone else can offer advise that would be great also!

PS. - Dont really have access to the tuner with BRZedit and dont own the software myself.

Thanks for any help!

[s2d4]

Originally Posted by 8686

My log
http://www.datazap.me/u/haririmm/155...ata=1-5-6-7-11
I noticed that AFR goes rich after 5,000 rpm. Is this normal?
Mods are in the signature.

Thanks in advance

Yeap, fbkc on low rpm ramping from low load to high load.

[wparsons]

Originally Posted by steve99

Hi @shiv@vishnu

If you have a look his IAM is 0.2 to 0.3 he is on Australian shell 98 RON fuel.

Is does appear that aussie 98 is not as good as USA 93 for low rpm high load knock resistance.

Three of us now same issue, all ok WOT above 3500 once IAM recovers.

Make it four, unless you're counting me in the original 3.

This isn't unique to Shiv's tunes at all, I would bet that if people were logging most canned tunes (and even lots of custom tunes) they'll find the exact same thing happening. I haven't pulled any logs on the stock tune, but I know I get knock on the stock tune occasionally on heel/toe downshifts on the throttle blip (clutch in, so no real load). I would imagine the same behavior would show up in logs on the stock tunes.

The "fix" for it is to change how the ignition tables are mapped out a bit.

You basically have to minimize (or zero out) the advance cells in certain rpm/load ranges and move all the ignition advance to the base timing table.

The final applied ignition advance is base timing + (IAM * advance timing).

The formula for figuring out if a knock event goes into fine or coarse (dropping IAM) correction is more complicated, but the only part that matters is that if the IAM * advance portion is under a certain value (2.9 or 3.9 IIRC?) it won't go into coarse correction and the IAM will stay up.

I call it a "fix" more than a real fix because you'll still get knock (which happens even with a LOW IAM, and even on e85), but it won't take out the IAM in the process.

Disclaimer, I haven't actually edited my own tune for this yet, just basing it off what other people have been experimenting with.
@jamesm posted a bunch of good information about this before being banned, and @nelsmar has posted a few times too IIRC.

[wparsons]

Originally Posted by 8686

My log
http://www.datazap.me/u/haririmm/155...ata=1-5-6-7-11
I noticed that AFR goes rich after 5,000 rpm. Is this normal?
Mods are in the signature.

Thanks in advance

Originally Posted by troek

most of us are going a little rich (high 11s) after 5k. especially with a fresh flash, ive been reflashing so much messing with my idle i havnt had time to see if mine has leaned out as the ECU learns or not.

Originally Posted by troek

i would maybe look at customizing your tune, provided ur o2 sensors are reading your AFR accurately. i konw mine are as i data logged the stock tune so i had a baseline as what it ran OEM. a quick check would be to flash back to stock and see what it reads, youd have to disable the cat cel since you have a catless header.

Before changing anything, pull another log with the AFR Commanded as a parameter as well as STFT and LTFT.

If the AFR read and AFR commanded are very close, and the trims are very close to zero then the tune is running as designed. If you feel like it shouldn't be so rich, then you'll need to take some fuel out of the appropriate table(s).

If the AFR read and AFR commanded aren't close, or they're close but the trims are bigger (> ~3%) then you need to re-scale the MAF table.

It's possible you'll want to change both things, but get the MAF table correct before doing anything else. With a properly scaled MAF both AFR's should be very close, and the trims should be very small (or zero). Once you have that you have a cleaner starting point for making further changes.