Posted By: Quicktree
launch RPM's - 04/01/13 04:28 PM
we were talking about launch rpm in another thread where people were saying to raise the rpm to make the launch softer or less violent. I personally have never seen that work. every car I have driven would be more violent as the rpm's go up. my arrow was doing a monster wheel stand at 5200. I left this weekend at 3000 and it was like being on a sunday drive. it lifted the from wheels maybe 2" and set them back down. the 60" was exactly the same nothing lost.still couldn't keep it from red lighting even after taking a bunch of shims out of the tb button. there are obviously a bunch o different factors involved.
Posted By: rickseeman
Re: launch RPM's - 04/01/13 06:58 PM
I'm with you. Lower is less violent to me. ET might be better leaving higher, but I like leaving low.
Posted By: gregsdart
Re: launch RPM's - 04/01/13 09:14 PM
The lowest I can make em hook and be consistent is best in my opinion. When I moved weight forward to settle wheel stands, I had to raise the launch rpm to hit the tires harder and stick them. Still, I am well below full throttle.
Posted By: Crizila
Re: launch RPM's - 04/01/13 09:39 PM
Makes a big difference in RT, especially if you are well below convertor flash. ----- Don't ask me how I know
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My car is a heavy street B-Body. I have found that lowering Launch RPM's slows BOTH my RT and 60'. I think this is unique to the combo, though.
Posted By: 383man
Re: launch RPM's - 04/02/13 11:16 PM
I have left from an idle up to coming up on the converter to 2500. I like it best coming up on the converter to about 2000 as my heavy B-body seems to like that about the best with my 9.5 Dynamic converter. Ron
Posted By: Crizila
Re: launch RPM's - 04/03/13 01:19 AM
You are looking at 2 back to back passes ( car #300). Left side is launching at 2700rpm. Obviously went red - for the second time over the weekend. Pass on right was with two changes; dropped a pound out the tires and launched at 1100rpm. Just about dead on my dial.
Posted By: tubtar
Re: launch RPM's - 04/03/13 03:15 AM
RT may slow if nothing else changes , but it is easy to remedy with a box and can still be regained with practice in a foot brake car.........can't it ?
I'm trying to understand the logic.......the RT is from green till when the wheels break the beam.
Being a foot brake kind of guy , I would then try to shade the last bulb or stare hard at the second of the last to get it back.
Not real scientific , but getting myself to find that sweet spot and making it part of the routine ought to do it I think.
Based on those slips and your launch RPM info, you're in the same boat with most of us: RT and 60' slowed dramatically with the lower RPM.
Posted By: tboomer
Re: launch RPM's - 04/03/13 12:09 PM
Interesting topic..I have launched at 4800 then I have it at 3400 now. R/Ts stay about the same and very little difference in the 60'. They only difference between the two is at the lower rpms,it doesn't leave as violent...
Been in heavy cars for some time , The higher RPM seam to slow the heavy car down , Lower RPM seam to make the car faster IDONO??
Now My car is light ,I say light at under 3000#, The 60 does not care if it is 3500 rpm or 2000, only couple # different ,so I leave at 2500,
I think a lot has to do with the combo , air in tires, converter, cam, and gearing,
Trans brake could make some difference, more so in RT than et? ,
Posted By: Dodgeguy101
Re: launch RPM's - 04/03/13 02:53 PM
Must be missing something here, I thought reaction time had to do when the driver let the car move? Cant see what RPM has to do with any of it? Can someone explain please? 60ft time I can see, but not the RT...
Posted By: Crizila
Re: launch RPM's - 04/03/13 03:06 PM
I guess there are a lot of factors involved here ( not to mention the human factor ). Next time I go out, I will go back to my "normal" launch procedures ( tires at 12 psi and launch at 2700rpm ) and see if my RT's return to - acceptable
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Touche, Senor 
