OFT - Letting Clutch Out Too Soon?

[takethecake]

Hey guys,

I've been dabbling with the OFT for a while now (probably spent about 20 hours on it total over the last couple months), and I keep running into the same issue on all my tunes. I can't tell if this is the same "dead spot" problem that other people are talking about, but I've tried the fixes for that problem and they haven't seemed to help.

When I'm running ANY custom tune (been mostly using the Stg1 mod for my CALID), my car seems to be much more sensitive to letting out the clutch quickly. If I let out the clutch fast without giving enough gas, it's almost like the car gets stuck - I can absolutely mash the gas pedal and the rpm's won't move, the car won't go anywhere - it just sounds like I'm lugging the engine. If I re-clutch-in and then let it out a little more slowly while giving it gas, the car takes off just fine. This has been rather embarrassing at stop lights, where I look like I'm stalling (although the engine doesn't die), but I've just let the clutch out too quickly so it doesn't matter how much gas I'm giving it - the car will just stay at 1k rpm until I clutch in and try to start moving again. Also, as far as time goes, I have run some of these tunes over 100 miles and seen no improvement in this problem, so it doesn't seem to be a "ECU still needs to learn XYZ" issue.

If I load the stock tune back in everything goes back to normal (at this point, it'll probably even feel like an upgrade since I've been struggling on these OFT tunes for a few weeks now). All I've been trying to do with OFT is to rescale my MAF table for a Perrin CAI, and to disable the cold start behavior (adjusted the post-start ignition timing table, the "MAF correction after start" tables, and the idle target tables only). My start-ups are MUCH nicer now with this tune that they were on stock, but that's sorta besides the point right now.

What I've tried: I saw this advice Foobar posted about the dead pedal fix and tried this a few times but didn't seem to make a difference:

Turn car on w/out starting engine
Fully press & release gas pedal 20 times
Turn car off
Turn car on w/out starting engine
Fully press & release gas pedal 20 times
Start engine

Does my description sound consistent with the "dead pedal problem" or is this something else? Thanks for reading guys!

[steve99]

It likely the load limits.


some USA OFT tunes had load limits set to about 1.6 at all rpm ranges.


This can cause car to bog at low rpm high load.


go to wayno's post here grab the load limit tables from the correcponding tunes at end of post and copy it into your tune, you might need to use his defs not sure if load limit tables defined in oft definitions.


http://www.ft86club.com/forums/showthread.php?t=83945

[takethecake]

Thanks Steve - I'll give that a try this afternoon. I might be using his def's already but I'll have to check that - the standard def's from the OFT website didn't have the MAF correction after start tables.

[takethecake]

Okay, here's where I'm getting stuck now - I am using Wayno's WW Definitions v115 2016-09-18 - B01C; editing the OTS_v2.076 Stg1-93oct-B01C rom.

When I open up my ROM in RomRaider and go to the load limit tables, mine don't quite match up with what I see in the OFT - Guide To Dialing in Your OTS Base Tune:



Any thoughts? I went ahead and flashed this ROM anyways with the pictured load limit tables, and it seemed to help a little, but the problem is definitely still there.

I also have some log files on datazap that I took yesterday - might help:
http://www.datazap.me/u/takethecake/...7?log=0&data=1

Thanks again!! Going to try and shorten my 4-month response time...