Originally Posted by: xDeaDxZeppLiNx 
Being that this is a thread about launch and I have been working on drag cars mostly as of late, i am curious about what the accepted way to "launch" in drag. I dont know what drop catch is, I don't really tune to just hold wide open and launch. I use my e-brake as a trans break, I don't use clutch, and I get the RPM I want, then release the brake at launch. I try to tune so my cars to be throttle sensitive, to where there's a little bit of throttle control needed to keep from roasting the tires or flipping backwards, haha. Whether this is after the countdown or at the go in a street race. Just seems the most real way to do it. I may be over thinking this, but just was wondering.
I'll try to explain some of the launches...
Full throttle : self explanatory
Drop catch: at launch countdown you keep the throttle at a fixed position (fixed rpm) let's say 8k rpm, when the counter says go you hold that position till your rpms get to the catch point let's say 3k rpm. The idea is to catch it as close to or in as much of the power and as you can without smoking the tires. Not really used as much these days espescially on the test track variant tracks. Hock and Sonoma with less traction drop catch is the way to go.. Can be used with manual with clutch or just manual.
Clutch slip: you have to use manual with clutch on this one as well as change your controller settings to a layout that makes your clutch analog control (trigger control of clutch). The idea here is to hold your clutch at a fixed position at launch with full throttle applied. Basically your holding in the clutch to limit tire spin and keep the rpms in the powerband. Some would argue but I would liken this to a high stall torque converter. The point at which the clutch slip is released varies from car to car, but can be as high as 70-90mph on some cars. This method is frowned upon mostly, although in forza 4 you probably weren't in the top 30 or so if you didn't do it... Forza 5 very few people were doing it, so much traction in that the benefits were minimal.
Brake boost: this method you have to use a manual tranny. Basically the brake pressures are reduced n the tune to where they really don brake at all. You have to hold the brake at a fixed position to where the rpms stay up in the powerband. It's kind of trial and error to find that point. I don't believe this one is used very much.
Part throttle clutch slip: This one is tricky... Usually only used on very very slippery cars. In forza 4 used mostly in x class where u couldn't use drag tires due to pi constraints. Same description as clutch slip with one added variant. The throttle is held at a fixed position (say 50%) while the clutch is slipped. Crazy stuff. Watch a x class replay in forza 4 and watch the telemetry from some of the top guys... All that clutch and gas control doesn't seem humanly possible to me lol... I haven't seen this style since forza 4 most likely due to the massive amount of traction at test track..
Hopefully didn't take this thread to far off track, but you asked...
Drag Lives Matter!!!