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ECUflash Building boost on the line with and auto and Ceddy Mods

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Cox Abele

10+ Year Contributor
485
53
Jul 4, 2010
Roanoke, Virginia
I recently finished up having a dyno session and am very happy with the drivability of the car and how it builds boost while driving. My only "wish" is that I could have had the thought to ask the tuner to make the car perform like it does now, but with the ability to build more than 3 psi on the foot brake at the line.

I'd read a few threads that say I should make a log of building boost on the foot brake, then pull timing and add fuel in the corresponding load and RPM cells. My concern is that I may encounter undesirable driving conditions because I'd be effecting the timing and AFR maps all of the time. I entertained this idea for a few hours, then considered what it may take to use my old clutch switch for Ceddy's mod package. I previously had a 5-speed, but converted to an automatic.

So, I got to looking at the launch control options. The launch control actually sounds a bit more appealing, and I wouldn't need to do anything fancy with my old clutch switch. I wouldn't change anything within the normal tune. I have a stock converter in a 99% street car with a TD06SL2 Billet 20g, Comp 272 cams installed straight up. Here's what I've gathered, please correct me if I'm wrong:


Rev Limit Switch Speed: Speed (mph) at which the Stationary Rev Limit setting is ignored.
*I'd want to set Rev Limit Switch to something very low, 1-2 mph so I don't end up in launch control mode when driving the car normally.

Stationary Rev Limit:Limit of RPM which will not be exceeded while on the foot brake and under the Rev Limit Switch Speed (mph)
*This would be my safety setting so I don't flash well beyond what the converter would want.

Anti-lag: Set lower than Stationary Rev Limit. This setting is the RPM in which my launch control would engage.
*This is what allows me to drive the car normally on the street. If I set it to say 2k rpm (which is currently just a little under where the car will stall to), I wouldn't engage my launch control under normal driving conditions.

Ignition Retard: Pulls timing at RPM higher than Anti-lag provided that I have not exceeded the mph setting applied to Rev Limit Switch Speed
*I'd need to log my timing to get an idea as to how much timing to pull, but it's fairly straight forward. RPM, load and the tune are irrelevant because Launch Control operates with the current tune in place but modifies it with a single cell of ignition timing advance or retard. Say I am running 13, 14 and 15* at different loads, Ignition retard will always retard by the same amount. Lets say I plug in -15* into the Ignition Retard cell and re-logged, I'd see 1, 2 and 3* advance.

AFR Control: Only works after Ignition Retard is set. Only works when I haven't exceeded mph set [iRev Limit Switch[/i] Works within RPM range between Anti-Lag (the low RPM setting where Launch Control becomes active) and the Stationary Rev Limit setting (which won't be exceeded until Rev Limit Switch Speed is exceeded.
*I'd fatten up the AFR mixture with this setting, which is done by setting a target AFR. Unlike Ignition Retard, this setting overrides the target AFR for load in the rest of my tune.



So, using arbitrary numbers, lets say I want to run 3* total timing at 10.0 AFR. I want my anti-lag to engage after I bring the stall speed up to 2,000 rpm, limit it to 3,500 rpm and only while I'm sitting still. After logging a non-launch control stall, I see that I have 13* timing throughout the load range- I'd use the following settings:

Rev Limit Switch Speed: 4mph
Stationary Rev Limit: 3,500
Anti-Lag: 2,000
Ignition Retard: -10
AFR Control: 10.0


Now of course, I will need to mess with the numbers to see what works with my setup, but does any of this sound incorrect or does it sound like I have a good idea what each of these settings does?
 
Please clear this up for me...

I've done a bit more reading and looks like I may have been wrong about Ignition Retard. Ignition Retard is not a modifier, it is an over-ride. Regardless of what the tune says, Ignition Retard is going to set the timing at whatever I enter into the single cell, regardless of the timing map.

Also, will Ceddy's launch control work without the engagement of the clutch switch? I guess to really understand this question, if you are in a 5-speed, in neutral, without the clutch pushed in, does the Ceddy Mod launch control still work? If the clutch switch MUST be depressed to engage launch control, it's not the end of the world- I could always wire in a relay to the clutch switch wiring that is activated off of the brake light circuit or the emergency brake switch.
 
Alright, so no quick answers means I do it myself.

Everything I said, or amended it correct. Ignition retard is static once set, AFR is static once set, and my assumptions about the different rpm activation and deactivation are correct. Also, launch control will engage without a clutch switch.

Now, time to dial it in.
 
Launch control limiter/anti-lag does not need the clutch switch. Also the The set rpms are when the override on the ignition and AFR (if you have it turned on) will kick in, and the speed switch is when the launch control is no longer active and it switches over to the standard rev limit and NLTS (if you have that setup). I hope this helps, and GL with dialing it in.
 
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