I'm not quite sure if I understand how to set the launch control up with the ezflash system through trifecta. If someone could help it'd be wonderful.

Here's my problem... I'm trying to set my launch control up so it's at 3500 or 4200 rpms. When I adjust the control settings its in %s. I tried the setting at 35% and my rpms got up to 5000 and bounce between 4700-5000 with it set at 35%. Am I doing something wrong or didn't it get set right?

 

I believe that the revs will still be that high but you are only using 35% of power...... i set mine to 15% n it still revs high

 

It's not a power limiter, it's a rev limiter. Try reflashing it, should be 35% of original setting=1750 rpm (way too low by the way). I had mine at 60% percent of original 5000 rpm limit=3000 rpm.

 

That's what I was thinking what was happening but I wasn't sure. That's the correct answer I was looking for though. So I just gotta do some math to get my correct setting for rpms. No wonder when I try to launch it, the car falls flat on its face.

 

i thought the idea launch for the lnf was 2200 rpm. which would be around 35%

 

Ya what's the best launch? I have it set at 60%

 

i was lookin on the drag racing threads a lil while back and i found somewhere on there that someone had mentioned 2,200 rpm was the most proficient way to launch

 

Mines set at 35% now and it falls on its face at the strip. It like wants to bog out a bit, but then goes. It's dumb and it feels like something ain't right.

 

I thought it was 4800 factory.... If thats the case im gonna reflash mine to 50%/ 2400 rpms.. Thanks for the info Soofisahab

 

5200 is factory

 

damn definitely need to adjust that

 

The answer is you're both right. The launch control RPM is slightly different per car / density altitude, just like the stock boost level is on this car. It's usually between 4,800 and 5,200 RPM though. This makes it difficult to get a precise launch control RPM set though because the percentage will be based on a slightly different number every day.

The launch control functionality includes communication between the ECU and braking module, so the way that Trifecta tricks the launch control into being adjustable is making the ECU lie to the braking module. This means that the RPM you see on the tachometer when you're tapping the launch control limiter is incorrect until you start moving and it exits launch control.

For instance, you could be seeing 5,000 RPM when your foot is planted, but you're really at whatever RPM you set. Your tachometer is lying to you until your wheels begin moving and the ECU/braking module exit launch control mode. Once you begin moving, the tachometer needle will snap back to the true RPM and everything is back to normal.

The reason for this is that the ECU exits launch control mode and resumes the normal rev limiter once the car is moving. The only way that is knows it's moving is from the braking module, because the braking module is the module that receives the signals from the wheels for movement.

 

so that is why whenever i turn on launch control the tach jumps up a few thousand. i always wondered why it did that. i just remember readin it in the trifecta manual that it wouldnt be correct

 

Yep. Don't believe the tach until you start moving faster than a few mph and the DIC doesn't say Launch Control anymore.

If you're not in Launch Control then everything is normal.

 

Question. So you can manually adjust your launch controll at any time? or Vince has to do it and then you reflash it with the new setting?

 

You can do it on an LNF anytime you want just as long as you have the red cable and the ezflash program.

 

Oh ok, so if you get tuned Via a Dealer you would obviously need to go to them correct? and if they have the black box dealer kit can they adjust it for you? or would they need an EZflash red cable as well?

 

Yes your dealer should be able to do it or anyone with the correct cable.

 

Gotcha!

 

I got the same bog repeatedly so I gave up on it. Has anybody used this feature beneficially?

 

Do you know if it's compatible with the tactrix (clear plastc) cable?

 

yes

 

So would setting it at 60% work better?

 

There was a thread a while back where it was said that 65% is the ideal setup (3200 RPM). I have mine set to it but I've never actually used the launch control in my car, stock or tuned.

 

Mine is currently set to 65% and I managed 2.0-2.1s at the strip constantly.