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Old 04-22-2015, 08:17 PM   #15
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I was able to replicate this as well. I'm on Stage 2 UEL, pretty much OTS tune other than adjusting the MAF for my intake.
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Old 04-22-2015, 10:29 PM   #16
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Originally Posted by joneze93tsi View Post
Ignition advance seems to disappear beyond 1.3 load, I think you are onto something..
I am pretty sure mine does not do this , however i have made heaps of changes to my E85 tune to suit our guaranteed 85% ethanol fuel.

As the oft guys make their tune run on a wide variation of ethanol percentage they appear to have artificially bumped up the values in the Open loop area of the maf scaling. Maf valus are an input to the load calculation the ecu does, as i have rescaled my maf my load values are less and i dont seem to trigger these limits.

you are running afr of 11.25 which is rich limit of sensor so it may be richer , the value in tables is about 12.3 .

I have not changed the load limits in my tune, but i suspect rescaling maf has eliminated the issue for me, although i rarly go 100% throttle at such low rpm.
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Old 04-22-2015, 11:00 PM   #17
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Traditionally large throttle openings at low RPM cause engines to knock. It may be some built in knock prevention that is exasperated by the tune. If you drive a manual you really shouldn't be going WOT below 2k rpm, that said if it bothers you I would say @steve99 is on to it and will help figure out what is going on.

I do remember reading other threads about lack of power at low rpm with a cut snorkel in particular. Perhaps the snorkel mod negatively effects air velocity into the air box at such a low RPM.
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Old 04-22-2015, 11:00 PM   #18
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I'm not really concerned with it, as this is the first time in 18K miles I've ever ran into it.
Just thought I'd see if it was a common thing/discuss it further.
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Old 04-24-2015, 12:55 PM   #19
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I take my last posts back. Stage 2 EL e85, went WOT in 2nd gear and my logs show drops in timing down anywhere from 1 to 5deg around 1500rpm. Intake is stock. Only mods are the tune, e85, and muffler delete.

I've never ran in to this before as I've never gone WOT that low. Even for my datalog runs I am in 2nd or 3rd at 2k RPM or higher. I think you can ignore this as under normal driving you'd never be WOT that low, and racing you'd be between 5-7k RPM anyway.

No log below 2k RPM which is what you're looking for, but my car otherwise runs perfect. Below is a 2nd gear pull on the EL tune if you'd like to compare timing.

http://datazap.me/u/slowbaru/iam-2nd...9&zoom=281-480
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Old 04-24-2015, 10:09 PM   #20
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Originally Posted by [Ron] View Post
I take my last posts back. Stage 2 EL e85, went WOT in 2nd gear and my logs show drops in timing down anywhere from 1 to 5deg around 1500rpm. Intake is stock. Only mods are the tune, e85, and muffler delete.

I've never ran in to this before as I've never gone WOT that low. Even for my datalog runs I am in 2nd or 3rd at 2k RPM or higher. I think you can ignore this as under normal driving you'd never be WOT that low, and racing you'd be between 5-7k RPM anyway.

No log below 2k RPM which is what you're looking for, but my car otherwise runs perfect. Below is a 2nd gear pull on the EL tune if you'd like to compare timing.

http://datazap.me/u/slowbaru/iam-2nd...9&zoom=281-480
Tried this yesterday 1000 rpm full throttle up in 5th up hill grade no problems slowly climbed to 3000 no dead spots, my e85 tune has a few mods however.
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Old 04-25-2015, 02:49 PM   #21
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Just going to inject this here:

http://www.ft86club.com/forums/showthread.php?t=80260

WOT issues before 2k, theres another thread i made before that too
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Old 04-25-2015, 04:44 PM   #22
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Quote:
Originally Posted by steve99 View Post
Tried this yesterday 1000 rpm full throttle up in 5th up hill grade no problems slowly climbed to 3000 no dead spots, my e85 tune has a few mods however.
same for me, no issues even down that low and in a condition that I would never see on the street or anyplace else.
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Old 04-25-2015, 07:51 PM   #23
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Originally Posted by steve99 View Post
Tried this yesterday 1000 rpm full throttle up in 5th up hill grade no problems slowly climbed to 3000 no dead spots, my e85 tune has a few mods however.
5th is too high of a gear. Try in 2nd, you'll likely feel it more if its there. I tried in 3rd and 4th and did not notice the timing dip because of the taller gears. Dropping down to 2nd I immediately felt it.
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Old 04-25-2015, 08:46 PM   #24
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Quote:
Originally Posted by [Ron] View Post
5th is too high of a gear. Try in 2nd, you'll likely feel it more if its there. I tried in 3rd and 4th and did not notice the timing dip because of the taller gears. Dropping down to 2nd I immediately felt it.
yep tried it in 1,2,3,4,5,6 no dead spot.

timing will drop that normal due load increase check out the base timing B table in any tune or stock, light load more advance high load less advance

these guys ere talking about complete loss of power.
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Old 05-12-2015, 01:24 PM   #25
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My car completely falls on its face if I give it >50% throttle below 2000 rpm; it just bogs out and won't accelerate at all. This is on the 91 octane ESC tune with a modified snorkel. I'll try to find the log I captured it on but from what I remember when it happened, my AFR pegged rich and load shot up to something ridiculous like >4.0 g/rev.

Is there anyone with this problem who doesn't have a modified snorkel? It seems like that, besides an OFT tune, is a common thread for people experiencing this.
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Old 05-12-2015, 01:46 PM   #26
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Old 05-12-2015, 03:02 PM   #27
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Originally Posted by PantsDants View Post
My car completely falls on its face if I give it >50% throttle below 2000 rpm; it just bogs out and won't accelerate at all. This is on the 91 octane ESC tune with a modified snorkel. I'll try to find the log I captured it on but from what I remember when it happened, my AFR pegged rich and load shot up to something ridiculous like >4.0 g/rev.

Is there anyone with this problem who doesn't have a modified snorkel? It seems like that, besides an OFT tune, is a common thread for people experiencing this.
I have seen some combinations of ethanol formulations and cars run quite rich at low RPM full load. I suspect it may be caused by some combination of header design, MAF turbulance and lower Ethanol %. All that you need to do to fix it is adjust the primary fuel table. The OTS AFR values will be in the mid-12:1 range down like this:


I fixed the issue by just tweaking it as such:


You can confirm by just datalogging a few low rpm/high gear pulls. The nice thing is that the engine will happily accept a pretty wide range of AFR at that low engine speed. Anything result from an actual 12.5:1 to 13.5:1 will work fine.
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Old 07-28-2015, 09:47 PM   #28
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Originally Posted by Shiv@Openflash View Post
I have seen some combinations of ethanol formulations and cars run quite rich at low RPM full load. I suspect it may be caused by some combination of header design, MAF turbulance and lower Ethanol %. All that you need to do to fix it is adjust the primary fuel table. The OTS AFR values will be in the mid-12:1 range down like this:


I fixed the issue by just tweaking it as such:


You can confirm by just datalogging a few low rpm/high gear pulls. The nice thing is that the engine will happily accept a pretty wide range of AFR at that low engine speed. Anything result from an actual 12.5:1 to 13.5:1 will work fine.


I think more likely because the load limits have been removed on C series roms. This never happens on other calibrations in OTS tunes because they're limited to about 0.9g/rev with stock load limits and thus reasonable AFR and positive ign adv.

I would bet good money all the people with this issue have C series roms.
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Last edited by Wayno; 07-28-2015 at 09:59 PM.
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