Data Logs! Post them here.

[DocWalt]

Originally Posted by joneze93tsi

E85+OFT+OFH+Dry Flow & Shivtastic Modified Snorkel.

3rd & Part of 4th gear pull.

http://www.datazap.me/u/joneze93tsi/...1-2-6-10-11-14


Interesting going from factory header to OFH in that you don't feel the need to rev it out as much around town, has much more grunt down low. It almost fools you into thinking that it doesn't pull as hard up top as you don't hear the angry VVTI changes anymore around 4k. Just very linear.

Exactly! I have a JDL UEL and @PA-86 drove my car and noticed the extra torque down low, and commented that it felt "meh" up top. I don't have to downshift nearly as awesome, it's pretty awesome.

[joneze93tsi]

Are the LTFT values on E85 as critical as they are when running normal 93-91?
I was under the assumption they would vary depending on ethanol percentage quite a bit.

In general they go between 2.5-3% and 7.5% depending on the fuel/day/temp.

I've noticed, especially with the wildly varying temperatures lately (40's tonight, was 87 yesterday) that they seem to vary quite a bit, especially as we are getting the summer mixture of fuel in place.

I took it as a good omen back when I was running 93 in the winter that the LTFT's were very nimimal that my maf scaling shouldn't be needed.

[steve99]

Originally Posted by joneze93tsi

Are the LTFT values on E85 as critical as they are when running normal 93-91?
I was under the assumption they would vary depending on ethanol percentage quite a bit.

In general they go between 2.5-3% and 7.5% depending on the fuel/day/temp.

I've noticed, especially with the wildly varying temperatures lately (40's tonight, was 87 yesterday) that they seem to vary quite a bit, especially as we are getting the summer mixture of fuel in place.

I took it as a good omen back when I was running 93 in the winter that the LTFT's were very nimimal that my maf scaling shouldn't be needed.

the maf scaling used in the oft E85 and petrol tunes is different

you will see larger variations in LTFT on E85 tunes due to variations in E%.

you will laso get variations on all tunes with large Temperature variations especially at idle due underbonnet heat and intake air temps.

idealy on E85 LTFT should be less than 10%, exception at idle where you might see it a bit higher when it rearly hot or cold. on petrol idealy less than 5% maybe a bit more at idle.

[joneze93tsi]

Originally Posted by steve99

the maf scaling used in the oft E85 and petrol tunes is different

you will see larger variations in LTFT on E85 tunes due to variations in E%.

you will laso get variations on all tunes with large Temperature variations especially at idle due underbonnet heat and intake air temps.

idealy on E85 LTFT should be less than 10%, excetion at idle where you might see it a bit higher when it rearly hot or cold.

Thanks for confirming. Car is running well with no knock and ADV pegged at 1. (log above)
Just wanted to run it past the the master.

I 10% think I have an exhaust leak at the OFH->Overpipe connection, but others seem to think it's just the sound of the thin walled header. I'll double check this weekend and actually try the paper truck, or plug up one side and use the old vacuum.

Thanks for always helping.

[steve99]

Originally Posted by joneze93tsi

Thanks for confirming. Car is running well with no knock and ADV pegged at 1. (log above)
Just wanted to run it past the the master.

I 10% think I have an exhaust leak at the OFH->Overpipe connection, but others seem to think it's just the sound of the thin walled header. I'll double check this weekend and actually try the paper truck, or plug up one side and use the old vacuum.

Thanks for always helping.

Yes exhaust leaks at header or near 02 sensor generally show up as high fuel trims at idle and low rpm. and get LTFT much better at higher rpm.

its sometimes hard to pick on E85 and with large temp fluctuations though

[Annahra]

So this is on the OFT Stage 1 93 Oct tune (2.06). Car has drop in filter, inlet tube, and catback and is running on 93 octane from Mobil. Would someone mind telling me if everything looks okay? Still having trouble sorting out how to read logs. Thanks!

http://www.datazap.me/u/annahra/open...e?log=0&data=1

[sstfnv]

I'm having some pretty big lt fuel trim, can someone take look? Is it normal to have lt fuel trim around -7% ? Thanks!


Mods:
OFT+OFH
K&N drop-in filter
stock exhaust
Stage 2 UEL 93 oct tune


http://datazap.me/u/sstfnv/stage2-shell?log=0&data=1-7

[steve99]

Originally Posted by sstfnv

I'm having some pretty big lt fuel t rim, can someone take look? Is it normal to have lt fuel trim around -7% ? Thanks!


Mods:
OFT+OFH
K&N drop-in filter
stock exhaust
Stage 2 UEL 93 oct tune


http://datazap.me/u/sstfnv/stage2-shell?log=0&data=1-7

7% is not that bad, just check for exhaust leaks, did you use new gaskets on header and overpipe ?

[Kodename47]

I really wouldn't be worried about -7%. It looks consistent and we know that Shiv tries to make the tunes run rich for safety. None of the AFRs look bad on any of the WOT runs even though the LTFT is ~-3%. To me it looks like the trims are working fine....

People should stop worrying about LTFT, unless they really start to massively swing one way or another then they are working as expected. Fuel and ambient temperatures play a part and it is natural behaviour.

[sstfnv]

Originally Posted by steve99

7% is not that bad, just check for exhaust leaks, did you use new gaskets on header and overpipe ?

Thanks for the replies guys. Yes, I used new OEM gaskets and I'm positive that there are no exhaust leaks. I'm trying to determine if the tune is safe for track or if I need a custom e-tune..

[steve99]

Originally Posted by sstfnv

Thanks for the replies guys. Yes, I used new OEM gaskets and I'm positive that there are no exhaust leaks. I'm trying to determine if the tune is safe for track or if I need a custom e-tune..

Ok after the car is nice and warm ,log some hard driving and some full throttle runs on 3rd gear 2000 to redline. uphill grade is good if you can find it as keps load high.

As kodename47 said it looks fine afr good bit rich if anthing but that is safe. little bit og knock correction lower rpms but this is rearly common and its very intermittent and minor.

if your going to do a fair bit of track work you might look at

5W30 or 10W30 oil and maybe Oil cooler for warmer climates especially if your seeing oil temps over 230F on track
brake fluid and pad change. once you run into brake fade.

[phrosty]

First time running E85. Not sure how to interpret this 3rd gear pull. Is this running super rich, or is it expected? http://datazap.me/u/phrosty/tune-9-l...om=39623-40178

[steve99]

Originally Posted by phrosty

First time running E85. Not sure how to interpret this 3rd gear pull. Is this running super rich, or is it expected? http://datazap.me/u/phrosty/tune-9-l...om=39623-40178

First tank of E85 will have residual petrol, so generally runs rich till fuel trims sorted.

high Negitive fuel trims means low E%
High Positive fuel trims means High E%

low trims means your E% is around 75%
on unmodified OFT tune


You can speed up learning up by doing some partial steady throttle say 20% , runs from 2000-6000 try to keep fuel system status in Closed loop for learning. ie status =2

Fuel system status in logs
1= Warmup/ O2 not up to temp
2= Closed loop
4= Open loop
8= Fuel system fail/error

[DarkSunrise]

If anyone is wondering about engine logs with OFT stage 2 at the track, here's mine.

http://datazap.me/u/darksunrise/trac...og=0&data=1-14

You can see a fair amount of knock in the form of FLKC, although IAM was solidly 1.0 and didn't drop.

In terms of fuel I was running:

- 2/3 of my tank was a bad batch of 93 octane (I filled up the day before my track event and was suddenly seeing knock on the street)
- 1/3 of my tank was 100 octane from the track

Call it 94 octane maybe. Definitely a good idea to add 100 octane or use e85 at the track. Later in the day, I later added another 1/3 tank of 100 octane and the engine was happier - I had much less knock and gained a couple of mph at the end of the straight. It's nice being able to pull on those pesky S2000's!

I had also installed a Perrin oil cooler. Looks pretty effective from the log. Even during the later hotter sessions, I don't think I saw anything north of 235 F. The only downside is I think the oil cooler lines are heating up my stock airbox and increasing IATs by 10 F, maybe more. I'm constantly seeing IATs 20 F above ambient now at speed.

I'll see if I can take some logs with higher mix of 100 octane later today.