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Discussion and questions related to the course Launch Control
Hi I purchased the launch control course but its geared towards manual transmission vehicles so wasn't really much help with the issues im having.
I have a Turbocharged V8 with a auto transmission. No trans brake so can only hold 2500 rpm on the foot brake. Im having issues with back firing through the intake when using launch control. I have it set on fuel cut but I did experience similar issues when on ignition cut but I diddnt have much of a go with it on ignition cut. I have a link G4+. Ive tried adding fuel and tried different ignition timing. some times it makes it worse but its not consistant. might get two goes that it doesn't backfire and builds heaps of boost then ill drive up the road and try it again and its back to back firing. got me a bit lost and not sure where to go from here??
Have watched a few of the webinars and you mention port fuel wetting occasionally. Do you think that it could have a bearing on the problems im having above?
In most instances with an auto transmission you're going to need a trans brake to get the best possible launches. I'm not sure how exactly you're using the launch control though? Are you setting a launch rpm at 2500? Does your engine use hydraulic lifters? What happens if you try to use the launch control in neutral?
What ECU are you using? Does it have sequential injection configured?
Yes I had the launch control set to 2500. and yep I do have hydraulic lifters and that was why I opted for the fuel cut launch setting. I have since changed over to ignition cut and added some fuel. I have no backfiring in intake or exhaust and can build around 13psi at 2500 with 1deg of timing. Only issue I have now is the time it takes get to the limit and to build boost so am going to try with the timing higher to begin with then pull it back as boost pressure rises as it struggles against the converter with timing at 1deg.
Im using a link g4 with sequential setup.
From what Andre has told me, with auto cars and tans brakes (not sure if you have one), it’s not the best way to build boost since it’s reducing the torque, the retarding is best used on manuals where it doesn’t effect it. Although I’m not sure I understand this 100% from what Andre explained to me, so if he replies again I’ll leave that to him as I’m still learning.
if you’re only pulling 1 degree of timing (not sure if you meant after the retard you have only 1 degree of timing or you’re only retarding it 1 degree) That will definitely take a very long time to build the boost. You can pull say 15 degrees at a lower kpa (than your target) then 20 more kpa pull 10, 20 more kpa pull 5, then the next 20 where your target boost is for launch you can set it back to 0 which pulls no timing and that should keep your boost right where you want it. This is theoretical numbers and not saying to actually pull that but that’s the strategy Andre used to build boost quickly and then hold you at your target. You’ll just have to keep playing with it and datalog the two step to see what works best for your application