shift rpm or timer

gnicholson · 09-12-2011, 11:17 AM

i have a 3200 lb with me heavy s st car that will run about 9.40 @140 wide open and with the stop coming on .2 and off 2.70 will run 10.90 at 136 at 2000 ft. right now i have all dedenbear electric t stop and shift componants. the rpm shifter is set at 7200. right now i dont have a data logger but i suspect shifting with rpm after the stop is open is causing some inconsistencies judging from my 60 to 330 times. do you guys think i should swith to a timer? its 4400 on the stop. thought doing it with a timer might be better for tire spin and the rpm should be more steady.

wayne sipos · 09-12-2011, 12:27 PM

I shift 1 sec out....stop on .300 stop off 2.40 sec runs 10.90 @142.....rpm stays stable at 4000 rpm.....

Chris Williams · 09-14-2011, 10:52 AM

IMHO, shift on time, much more consistent. We also shift at 1.00sec, while still on the stop.

gnicholson · 09-15-2011, 12:41 AM

thanks guys.i thought my car being heavy might work better shifting by rpm but i know by time is more consistent.in most cases

09-12-2011, 11:17 AM	#1
gnicholson Member Join Date: Sep 2011 Posts: 101 Likes: 14 Liked 4 Times in 3 Posts	shift rpm or timer i have a 3200 lb with me heavy s st car that will run about 9.40 @140 wide open and with the stop coming on .2 and off 2.70 will run 10.90 at 136 at 2000 ft. right now i have all dedenbear electric t stop and shift componants. the rpm shifter is set at 7200. right now i dont have a data logger but i suspect shifting with rpm after the stop is open is causing some inconsistencies judging from my 60 to 330 times. do you guys think i should swith to a timer? its 4400 on the stop. thought doing it with a timer might be better for tire spin and the rpm should be more steady.

09-12-2011, 12:27 PM	#2
wayne sipos Junior Member Join Date: Dec 2007 Location: ontario canada Posts: 39 Likes: 0 Liked 0 Times in 0 Posts	Re: shift rpm or timer I shift 1 sec out....stop on .300 stop off 2.40 sec runs 10.90 @142.....rpm stays stable at 4000 rpm..... __________________ Wayne Sipos HR 3959

09-14-2011, 10:52 AM	#3
Chris Williams Member Join Date: Mar 2009 Location: Woodinville, WA Posts: 401 Likes: 0 Liked 0 Times in 0 Posts	Re: shift rpm or timer IMHO, shift on time, much more consistent. We also shift at 1.00sec, while still on the stop. __________________ Chris Williams 6304 SC, TD, ET

09-15-2011, 12:41 AM	#4
gnicholson Member Join Date: Sep 2011 Posts: 101 Likes: 14 Liked 4 Times in 3 Posts	Re: shift rpm or timer thanks guys.i thought my car being heavy might work better shifting by rpm but i know by time is more consistent.in most cases