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Ignition Timing Ceiling

35K views 168 replies 22 participants last post by  scarlett007  
#1 ·
Hey guys, I wanted to start a new thread on this one. I'm hitting a timing ceiling at 15.5* around 6000rpm. Spark Source and Spark Limited Source are both 2, I've changed the BL tables and CP Ceiling (5) tables. I'm not sure where to go from here.

Ignition Tuning Ceiling

View attachment 35506

The car is pulling like crazy. In fact, it's getting hard to do 3rd gear datalogs. I want to start some more Ethanol tuning but I need to get past this limit. This is straight 93.
Thanks.
 
#106 ·
I lowered the stoich set point from the last log. It brought the stft down to a peah of 7% on the low end and 3% on top end. Ltft stayed at .78%.
I added the additional tweaks to the other map slots, so I lowered the stoich set point a little more to see what happens. Settings are now at the E35 recommendations. No interesting logs today, but will see what happens tomorrow.


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#107 ·
I lowered the stoich set point from the last log. It brought the stft down to a peah of 7% on the low end and 3% on top end. Ltft stayed at .78%.
I added the additional tweaks to the other map slots, so I lowered the stoich set point a little more to see what happens. Settings are now at the E35 recommendations. No interesting logs today, but will see what happens tomorrow.



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Did you also changed the density? Or just played with the setpoint?
 
#113 ·
Well it's nice to see some others going to the corn! Silver shooter, you will love it when you get the tune dialed in! Your next thing will be very sticky tires LOL and better brakes, ask me how I know? Make use of the low rpm's on the corn and the car comes to life! the only problem is after 4500 rpms we start to get flat line, but up to that point it's all fun! You will see what I mean once you get in the spring and it warms up, good luck with your tunes, it sounds like your getting a handle on it. I have been running my ST for about 6months+ on the corn, I can't even put pump gas in it anymore! I get withdraws and it's too dam slow LOL
 
#114 ·
Just remember with E , always keep it on the wet side !!
 
#115 ·
Could you explain this? I assume you mean a rich afr? Lol

Thanks for the info. I can't really get anything stickier than Hoosier racing tires :) I have a fairly sensitive butt dyno from doing this so long, and I can honestly say the car is pulling harder on this gas/tune than it has on anything else I've tried. Can't wait!


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#120 ·
Just a friendly word of caution! With E85 on pump, I would be very careful adding timing up top on this engine with the k03! it doesn't make enough boost to maintain the horsepower, and if you are just pushing more timing be very careful! We did it on the dyno and adding more timing over MBT did not make any more horsepower. It's the turbo! Considering the turbo is only good for 250hp per the map, it just don't have the boost in the upper RPM. The best we did was 296 whp on the edge, I keep it at 292whp most of the time, that all we could get out of it. Silver Shooter have you dynoed yet to see what its making? If you are adding more timing on top, make sure you do it on the dyno, that way you don't grenade your motor, I want to see what time you get once you have it tune on E Good luck
 
#121 ·
Silver, kinda off topic, but do you have some logs of the tune you were running when you were trapping 107? I'd like to compare them to some logs I have where Randy added some timing up top for me. I'm itching to get to the track, but it doesn't open for a few weeks here lol
 
#127 ·
Looks like we are running similar timing, you just have a bit more boost. I see your wgdc is pegged at 100% most of the time where I'm not. I sent a log over to Randy. Wonder if I have room to add a little boost?
 
#128 ·
Yeah, your log looks good. My car pulls a lot of timing with the FSW map, but it doesn't with other maps that run even more timing than FSW. I've been working on finding the answer why.
As for WGDC, I had a small boost leak that I found over winter. I don't know if it was leaking during those passes or not. The OTS map I started my current tune with hits 100% DC around 5400 rpm, but I know it's not leaking now. I made one of these :)
Image



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#129 ·
Nice! Im contemplating doing some hard pipes, if I can get 12s on the stock turbo ill be happy. When are you getting to the track next?
 
#133 ·
Your OAR is -1.0 or ign correction? I believe OAR will only go from -1 to 1, -1 being good. If youre talking ignition correction, positive is good.
 
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#140 ·
Are you running e85?

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#142 ·
Good time! R u still using the k03?


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#144 ·
Yes. Sorry, I wasn't trying to be short but I was replying from the staging lanes. Lol



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That's is awesome! I don't think anyone has made that time yet! I thought ST might have a high 12 in it, How do you like the FFS? Great to see you advance with the ST like you have :cool2:
 
#149 · (Edited)
Why not get a little bit more boost when it hits the boost spike to get a little extra tq if the tires are hooking up good and maybe a degree of timing down low so you can get extra tq also so you can get quicker of the line? Everything looks really good so really dont see anything to change crazy good timing and charge temps!
 
#147 ·
Damn how are you able to get away with that much timing? Lol. Randy has me at about 16-16.5 up top with 1-2 positive corrections, doubt I have much room for more
 
#150 ·
You want -1 in OAR octane adjusment ratio that determines the quality of the gas! And negative corrections in knock is bad also the + corrections that silver was talking about are adjustments the ecu is doing in timing due to the quality of the gas and the ecu is adding more timing due to the high quality gas!
 
#156 · (Edited)
There are two different parameters people talk about commonly in regard to timing corrections. The first is octane adjust ratio learned. This is the one you want to be at -1. The -1 signifies that the octane quality of the gas you are using is high.

The second is ignition correction per cylinder (1-4). This value you want to be positive. Positive corrections means the ECU is adding timing due to high quality fuel and no knocks being registered on your knock sensor.
 
#160 · (Edited)
The OAR is a very effective tuning tool if used correctly.
Are you sure about that?

Its hearsay but I thought it was interesting that a Ford Calibration engineer reportedly said the flowing "Since 2011 the OAR is not in play with our ECU"
 
#153 ·
Well I attempted to run the 1/8 mile on my E 85 tune , what a joke! It was kinda like ridding a wild bull out of the gate LOL ! My best time, with trying to just do a roll on was 9.100 not good! Now writing a launch program for my ST and trying it on the 19th April 1/4 mile this time! Like your 13.03:tree:
 
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#163 ·
OAR should be -1 at both WOT and cruising if you're using Cobb's OTS tunes or Randy's tune. Not sure about Alex's tune since he said he changes how it functions with his tunes.

Ignition correction is different from ignition timing. You want ignition correction to be positive and not negative while at WOT, though brief negatives are okay as long as it isn't for prolonged periods of time and not a huge negative (like -3 or worse).