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Old 09-11-2013, 06:24 PM   #1
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Programmable launch control with Bama tunes

Well I noticed that when you get your race tune you have the option of setting a launch control, I was wondering if there was any side effects to using it and if they pull spark or fuel to hold the engine at the desired Rpms? I have a buddy who set the launch control on his WRX and it ran slower at the track (he has time slips to prove it) because it was setting off the knock sensor. I was curious if the same thing would happen to mine. I do plan on hitting the strip to test this out eventually.
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Old 09-11-2013, 06:47 PM   #2
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I used it before. It just holds the car at the desired rpm while stopped in 1st gear. I didn't really use it much because the lowest rpm BAMA offered was 3k rpm and my tires sucked so bad I couldn't even launch from that without spinning... It will prevent you from being able to do a burnout though because you won't be able to rev past a certain point while stopped and in neutral.

---------- Post added at 04:47 PM ---------- Previous post was at 04:45 PM ----------

I did this video a while back... Watch around 4:30 for an example of the launch control.
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Old 09-11-2013, 06:58 PM   #3
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Yeah I don't really care about burnouts so I'm not worried about that and I only run the race tune at the track. Did you have to clutch in to do it?
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Old 09-11-2013, 07:04 PM   #4
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It only works when you are in 1st gear and stopped, so yea the clutch has to be in.
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Old 09-12-2013, 09:36 AM   #5
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Quote:
Originally Posted by JDF View Post
Well I noticed that when you get your race tune you have the option of setting a launch control, I was wondering if there was any side effects to using it and if they pull spark or fuel to hold the engine at the desired Rpms? I have a buddy who set the launch control on his WRX and it ran slower at the track (he has time slips to prove it) because it was setting off the knock sensor. I was curious if the same thing would happen to mine. I do plan on hitting the strip to test this out eventually.
Yes, the car will cut fuel when using launch control. All rev limiters/launch control will always use a fuel cut. However, it only cuts fuel for just a second so you won't really loose much power. The fuel table goes back to normal the second you launch.

It does help you get a more consistent launch but once you find that money spot for the launch, I wouldn't use launch control anyway. With a little seat time, you'll find that launching the car at a few different RPM's really helps. Every single pass depends on the weather, humidity, DA, etc...

I hope this helps! Let me know if you have any questions or need some further assistance.

-Dan
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Old 09-12-2013, 11:11 AM   #6
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The rev-limiter routines in the tune shut down the injectors in a sequential round robin fashion; as NO fuel is injected there are no combustion related concerns regarding the AFR being too lean for the affected cylinder. This does however create a problem for the catalytic converters as the "cut-out" cylinder pumps air into the exhaust gasses that would cause thermal runaway if not dealt with.

It is dealt with in open loop mode by commanding a leaner mix in the other cylinders--which creates another problem, unequal exhaust valve temperatures; that is dealt with by "skipping" cylinders via a rotating bitmap. The EECV root system is quite sophisticated, cutting-edge for it's time.

Here is the description of the the routine, from the PCM source code.

Code:
/**#############################################################################
**
**  FILE NAME : tqctl_injoff.c
**                   Ford Motor Company 2002
**
**  FUNCTION  : tqctl_injoff (torque control injectors off)
**
**  ABSTRACT
**
** Whenever cylinders are turned off thru INJ_CUT_REQ, the open loop fuel logic
** schedules a lean air fuel in order to protect the catalyst from over
** temperature (don't run rich if you have excess air from cut out cylinders).
** Although this may be good for the catalyst, running lean during a high
** speed/load condition may have adverse affects on cylinder valve temperatures.
** To avoid possible exhaust valve overtemp condition, this logic allows the
** injector cutout bit pattern (INJ_CUT_REQ) to be rotated to ensure that all 
** engine valves are equally cooled.  Every INJ_HOLD number of engine events 
** (2 crank rotations), the bit pattern is rotated left one bit.  INJ_HOLD 
** should be short enough to provide cooling, and long enough to minimize 
** transient fueling effects of rotating disabled cylinders.  A calibratable 
** engine speed function (FNINJ_N_LIM) is provided to enable the round robin 
** injector cutout during high speed conitions, otherwise a set (non rotating) 
** method may be preferred during low speed operation for drivablility "feel" 
** concerns.
**
** In addition, this logic will upon the first request to cut out a cylinder by
** the torque control logic, automatically rotates the cylinder cut out pattern
** to align a cutout bit with the actual bit in INJ_CUT_REQ that foreground fuel 
** will consider on the next PIP inturrupt.  This logic in effect cuts out the 
** next available cylinder, so it is useful for traction control and in general 
** a more accurate torque calculation.
**
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Old 09-12-2013, 12:15 PM   #7
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Ok thanks guys. I'll give it a shot here in a couple weeks and see how it goes
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Old 09-12-2013, 12:25 PM   #8
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Much better to run a msd 2 step made for the modular motors. They cut spark instead of fuel which is very important for all of us that are forced induction. I run it and its pretty cool, however i wish it was digital because setting it can be a pain to get exactly where you want it. Easy install though and much better than a fuel cut
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Old 09-12-2013, 12:49 PM   #9
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Originally Posted by onesickstang01 View Post
Much better to run a msd 2 step made for the modular motors. They cut spark instead of fuel which is very important for all of us that are forced induction. I run it and its pretty cool, however i wish it was digital because setting it can be a pain to get exactly where you want it. Easy install though and much better than a fuel cut
Good to know. If I was more serious on drag racing I would look into getting one, but I don't plan on doing any serious racing.
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Old 09-12-2013, 12:55 PM   #10
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Yea its just a much safer option for forced induction and it sounds pretty sweet too. Check out YouTube videos for it
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Old 09-12-2013, 01:02 PM   #11
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Yea its just a much safer option for forced induction and it sounds pretty sweet too. Check out YouTube videos for it
I can do that.
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