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08-07-2007, 10:51 AM | #1 |
Scooby Specialist
Member#: 44351
Join Date: Sep 2003
Chapter/Region:
MWSOC
Location: Cincinnati, OH
Vehicle:2004 Mitsubishi Evo 701whp 9.91@146 |
Launch Control Question
I was at the drag strip back in June and I was just doing some dial in runs to make sure the tune was ok. I was also trying to figure out how to use the launch control. Big thanks to Tony (x99percent) for the help in getting it to work.
So, I come up on the launch control and drop the clutch and away we go. Well right about 5500RPM in first gear, the car falls on its face for half a second then picks back up and I continue on through the gear. It did this for the 3 or 4 runs I made that day. I did some investigating and couldn’t find anything wrong. Then I looked at the data log from the run. I noticed my vehicle speed was “0” all the way to 5500RPM (which is where the launch control was set), then it would all of the sudden jump up to “30” and the launch control would turn off and I would go through the rest of 1st gear. I had a DTEC installed in the car and running at the time, but I had a manual controlling boost. I remember seeing a post by Phil saying that electronic boost controllers can diminish the signals to the Hydra and cause problems. Well, the DTEC takes, RPM, speed, TPS and knock voltage. So I’m wondering if the DTEC is causing the Hydra to not read speed or if it’s something else. I have since completely removed the DTEC, but I don’t have a motor in the car to test my theory and if there is a problem with the Hydra, I’d like to get it solved now instead of when a motor is in the car. Any thoughts?? Tim
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08-08-2007, 03:34 PM | #2 |
Scooby Specialist
Member#: 44351
Join Date: Sep 2003
Chapter/Region:
MWSOC
Location: Cincinnati, OH
Vehicle:2004 Mitsubishi Evo 701whp 9.91@146 |
This is a Hydra question, Phil!!
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08-08-2007, 05:22 PM | #3 |
Former Vendor
Member#: 54918
Join Date: Feb 2004
Chapter/Region:
MAIC
Location: Gaithersburg, MD
Vehicle:673 WHP Element Tuning Pro Comp Engine |
If you are reporting <0 MPH and TPS > 95***37; the Hydra will enable the "anti-lag" maps and the launch RPM. A quick fix until you get your speed signal back is to disable the "anti-lag high input" under select/settings/IO. This is a problem with the signals to engage the "anti-lag" maps and is not a problem with launch control so fixing this should allow your launch and flat shift to work correctly along with allowing full RPM.
Thanks, Phil www.elementtuning.com |
08-10-2007, 08:31 AM | #4 |
Scooby Specialist
Member#: 44351
Join Date: Sep 2003
Chapter/Region:
MWSOC
Location: Cincinnati, OH
Vehicle:2004 Mitsubishi Evo 701whp 9.91@146 |
OK, so the launch control is only based off the clutch pedal switch, nothing else? Whereas the anti-lag map is only active if speed is less than 0MPH and TPS is greater than 95***37;?
But why would the car run fine up to 5500RPM, then it hits a brick wall for a half second, then it runs out through the gear? If it was the anti-lag map kicking in, wouldn't it happen all the way through 1st gear? Since i'm used to the UTEC's launch control, I made sure my foot was completely off the clutch and it still hit the brick wall at 5500RPM. I do have logs of this. I should download them off my laptop and post them. |
08-10-2007, 03:36 PM | #5 |
Former Vendor
Member#: 17397
Join Date: Apr 2002
Chapter/Region:
BAIC
Location: Fremont, CA
Vehicle:many '02 Rex,'13 FRS WRB, White |
Yea I am having issues with the launch control/flat foot shifting.
With flat foot shifting unchecked I will clutch in and can get laucnh control from 0mph. but then it doesnt work when moving then with it checked it is enabled at all time. when moving with my foot off the clutch i hit a rev limit at 5500-6k. wiring is all hooked up correct from what I can see... -Dan Avon |
08-10-2007, 04:23 PM | #6 |
Scooby Specialist
Member#: 44351
Join Date: Sep 2003
Chapter/Region:
MWSOC
Location: Cincinnati, OH
Vehicle:2004 Mitsubishi Evo 701whp 9.91@146 |
I think I was having that problem with mine also. Unchecked the flat foot shift and I could rev above 5500RPM in other gears.
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08-11-2007, 12:13 PM | #7 |
Former Vendor
Member#: 54918
Join Date: Feb 2004
Chapter/Region:
MAIC
Location: Gaithersburg, MD
Vehicle:673 WHP Element Tuning Pro Comp Engine |
Launch control is based off of the clutch switch sending a signal to the Hydra to activate the secondary rev limiter. All this relies on the ACCY Harness being wired in correctly, the outputs and inputs setup correctly in the Hydra, and the cruise control clutch switch to be working properly.
Anti-lag is based off of the TPS and speed of the vehicle and when the criteria is meet a signal is sent to a Hydra input via the Accy Harness to activate the secondary rev limiter and the anti-lag fuel and spark maps. The two mistakes I've seen time and time again are "tapping" into the clutch switch wires but this will not work, you must pin the Accy Harness into the pins on the cruise control clutch switch and the other is not wiring in everything including the anti-lag wires. Also PWM 5 and 6 must be setup along with AUX launch low request and AUX anti-lag high request. Also make sure "flat-shift" is enabled under select/settings/setup. Without this enabled, launch will work at 0 mph but the system is turned off at speed. You can email me the map and I can just double check everything for you and if everything checks out ok then all you can do is send me the harness and I will test it. We've never actually had one defective or wired incorrectly but there is always a first. I have seen one or two back cruise control clutch switches however. Thanks, Phil www.elementtuning.com |
08-16-2007, 03:15 PM | #8 |
Top Scoob 002
Member#: 32771
Join Date: Feb 2003
Chapter/Region:
BAIC
Location: Danville, CA
Vehicle:03 Black WRX 04 White M3 |
just wanted to update the thread, it was me being a noob and not connecting the cruise control pins all the way. Haha I sure bet Phil gets sick of stuff not working because of user error
It's pretty hard to see if the pins fully go on because the area is so high up under the dash. I ended up cutting the cruise control connector off of the oem wires and then connecting the connector to the hydra harness wires. this way it plugs into the pins like the oem cruise control. now flat foot shifting works perfect everytime. haha it's pretty sensititve also, first time i had my foot resting on the clutch and it engaged the rev limit. nothing like slamming into the rev limiter after getting full spool on a 35R |
08-17-2007, 07:23 PM | #9 | |
Former Vendor
Member#: 54918
Join Date: Feb 2004
Chapter/Region:
MAIC
Location: Gaithersburg, MD
Vehicle:673 WHP Element Tuning Pro Comp Engine |
Quote:
Thanks, Phil www.elementtuning.com |
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