Drag Tuning: Drop Catch

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Drag Tuning: Drop Catch Empty Drag Tuning: Drop Catch

Post by BiggLou55 on Fri May 04, 2012 2:16 pm

This was referred to by Marm in the Drag tuning thread. I've extracted it from the FM4 forums to re-post here... Enjoy!

AGRO 308 (FM4 Forums) wrote:
RWD ALL OUT DROP CATCH TUTORIAL (Tuning and Launching)

Wednesday, May 02, 2012
11:13 AM

By AGRO 308
Pasted from <http://forums.forzamotorsport.net/forums/thread/4900164.aspx>

Ok guys, I will try and help everyone here learn how to drop catch and tune for a drop catch as best as I can in this tutorial. Please remember that some cars are harder to tune than others. These tunes are for cars where you do not have to keep them at a certain class or with certain restrictions.

PARTS LIST
I will start from the back of the upgrade menu and work my way through.

Conversions :
• Pick the engine you want in your car (Some will be faster than others).
• Use aspiration conversion if possible (Turbo is best)

Aero :
• Any parts that reduce weight without reducing stats should be used (Use after market hoods and remove bumpers where possible.

Tires :
• Make sure you use drag radials
• leave front tire width stock
• make sure rear tire width is at its maximum.
• Pick some lightweight rims (I use hole-shots).

Drivetrain:
• Make sure everything is using race upgrades.

Platform and Handling :
• Make sure everything is using race upgrades.

Power :
• Make sure everything is using race upgrades.(Some cars will require you to lose some power to reduce wheel-spin)


BASIC TUNING
Ok now you have your parts combo. I will go through the tuning setup except for gearing here.

Tire Pressure :
• Front should be as high as possible
• Rear should be anywhere from stock to 35 PSI

Alignment :
• Front Camber = -0.5
• Rear Camber = 0.0
• Toe both 0.0
• Caster = stock

Springs :
• Front Spring rate as low as possible
• Rear Spring rate as high as possible
• Ride height as high as possible on both

Damping :
• Front Rebound as low as possible
• Rear Rebound as high as possible
• Bump stiffness as high as possible on both

Aero :
• If you used any adjustable aero ensure it is set as low as possible

Differential :
• Acceleration = 100%
• Deceleration = 95%

GEARING
There is many ways to tune your gearing, I will explain the basic way gearing works in drag racing.

Leave your final drive at stock. Move your first to 1.80, go to hot-lap and test it. Try holding at various RPM ranges and catching after the wheels stop spinning. If your car still spins then you must lengthen the gear (take it to 1.70 and test again), if it doesn't you should shorten the gear (take it to 1.90 and test again).

2nd and 3rd gear are tuned by testing, set your third to tap out just after the quarter mile, then test your 2nd gear to find the best pull.


Ok now to the Launching
Drop Catch launching is where you hold your revs at a certain point and catch the revs after the race starts at a certain point.

Lets say for demonstration sake, the drop catch is 8000 to 2000.

As soon as you have control of your cars revs, get the revs to sit at 8000and hold your throttle there so it is stable. You must keep your throttle in that exact place through the entire launch. When the countdown finishes the revs will drop automatically (still holding your throttle in place) wait for it to reach 2000 and mash on the throttle.

Timing of your catch point is the key to this launch and some cars will be harder than others.

Some cars will require you to bounce off the rev limiter instead of holding at a certain RPM. To do this effectively, you need to be able to hear your cars revs and be very familiar with it.

I hope this helps and its not too much of a mess, all feedback welcome.

BiggLou55
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Drag Tuning: Drop Catch Empty Re: Drag Tuning: Drop Catch

Post by joekorn on Fri May 04, 2012 6:31 pm

Thanks Lou! I've always found drag tuning a little sketchy, this will help a ton.
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Drag Tuning: Drop Catch Empty Re: Drag Tuning: Drop Catch

Post by marmuttlebow on Fri May 04, 2012 8:21 pm

Methinks you got the wrong guy. You sure I mentioned drop catching?
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Drag Tuning: Drop Catch Empty Re: Drag Tuning: Drop Catch

Post by beefsupreme42 on Fri May 04, 2012 11:29 pm

Thanks for the help, I could really use it. I suck at drag tuning
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Drag Tuning: Drop Catch Empty Re: Drag Tuning: Drop Catch

Post by BiggLou55 on Sun May 06, 2012 4:45 am

marmuttlebow wrote:Methinks you got the wrong guy. You sure I mentioned drop catching?

Yep... You posted it (below) in the Drag Tuning thread Joe started...

marmuttlebow wrote:What really helped me was that thread on drop-catching (if that's the proper term).

http://forums.forzamotorsport.net/forums/thread/4900164.aspx

My biggest problem was launching. Still is a problem everywhere. But this tutorial really helped me for the Regatta challenge.

Smile
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