Re: Slowing down by taking timing out
[Re: humpty]
#2538219
08/18/18 07:46 PM
08/18/18 07:46 PM
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Joined: Jan 2003
Posts: 19,363 Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,363
Las Vegas
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We have done it in S/ST to SLOW the MPH down and we do it with the Dragster to keep it legal for my son who is not licensed to go faster that 7.50. In the dragster we pull 10-12 degrees out to keep it over 7.50 here in Vegas. In my old Cuda I ran it at 22 total to keep the MPH down a bit mostly for track positioning. It still went 160 that way.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Slowing down by taking timing out
[Re: humpty]
#2538220
08/18/18 07:47 PM
08/18/18 07:47 PM
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Joined: Oct 2011
Posts: 3,036 bean town ....Ca
WHITEDART
master
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master
Joined: Oct 2011
Posts: 3,036
bean town ....Ca
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Does anyone pull timing to run index classes? If so, how much can you slow down? Car runs 10.1 - 10.2’s and need to slow to 10.5. I can pull up to 9.9 degrees with the ignition if need be. I don’t want to mess with a mechanical stop as I’m running 2 classes, one is heads up all out, the other is index.
Thanks. you could always re adjust the throttle cable.. I would think trying to kill three or four tenths with timing would be hard on the bearings.. you could add weight also staging deep can scrub as much as 10th
Last edited by WHITEDART; 08/18/18 07:48 PM.
In the 8s N/A.with Brett miller W8's 5.07 at 133 at 2700lb
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Re: Slowing down by taking timing out
[Re: humpty]
#2538274
08/18/18 10:30 PM
08/18/18 10:30 PM
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Joined: Apr 2007
Posts: 289 Lowes
steve660
enthusiast
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enthusiast
Joined: Apr 2007
Posts: 289
Lowes
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Have you tried lowering shift points?
Easier than messing with timing.
PSO headed 632 from MM. Cracked cylinder, loose valve seats, low oil pressure, low cylinder pressure. ..... Now its a door stop....
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Re: Slowing down by taking timing out
[Re: humpty]
#2538316
08/19/18 12:01 AM
08/19/18 12:01 AM
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Joined: Oct 2007
Posts: 4,206 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,206
New York
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If you retard it enough the engine won't have enough power to idle.
Boffin Emeritus
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Re: Slowing down by taking timing out
[Re: humpty]
#2538401
08/19/18 01:45 AM
08/19/18 01:45 AM
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Joined: Aug 2003
Posts: 43,174 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,174
Bend,OR USA
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We mess around with a lot of things back a long time ago to slow down a 10.60 car the run S/ST(10.90 index) we ended up getting the largest ET reduction by over revving the motor from 6400 RPM to 7000 RPM shifts in 1st and 2nd gear We tried taking timing out down to 28 degrees in two degree increments, we tried short shifting at 6000. 5500, and 5000 RPM and even shifting directly from 1st to 3rd We didn't add weight though, didn't have anywhere legal to store it Lots of ways to slow them cars down Find out what you like and which works best for you
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Slowing down by taking timing out
[Re: humpty]
#2538486
08/19/18 11:50 AM
08/19/18 11:50 AM
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Joined: Oct 2007
Posts: 4,206 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,206
New York
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Obviously, weight works but it also will affect your chassis set-up
Boffin Emeritus
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Re: Slowing down by taking timing out
[Re: humpty]
#2538493
08/19/18 12:04 PM
08/19/18 12:04 PM
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Joined: Oct 2011
Posts: 3,036 bean town ....Ca
WHITEDART
master
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master
Joined: Oct 2011
Posts: 3,036
bean town ....Ca
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Thanks everyone. I tried launching in 2nd but it slows too much. Looks like I will try to fabricate a mechanical stop that I can remove and set back quickly as some of the rounds end up being nearly back to back. Next year I may focus on setting the car up for 10.0 and run both classes shooting for the same ET. Thanks to Whitedart I have heads that should make it an easy 10.0 combo.
if you can run several classes with the same number on the window..you will have a major advantage..I bet 10s with the new stuff will come easy.
In the 8s N/A.with Brett miller W8's 5.07 at 133 at 2700lb
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Re: Slowing down by taking timing out
[Re: humpty]
#2538574
08/19/18 03:32 PM
08/19/18 03:32 PM
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Joined: Jul 2004
Posts: 19,317 State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,317
State of confusion
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Does anyone pull timing to run index classes? If so, how much can you slow down? Car runs 10.1 - 10.2’s and need to slow to 10.5. I can pull up to 9.9 degrees with the ignition if need be. I don’t want to mess with a mechanical stop as I’m running 2 classes, one is heads up all out, the other is index.
Thanks. Put EFI on it............... Sorry couldn't resist OR go back to the carb you had before you got THUMPERIZED...........
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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