higher staging rpm stall speed= reduction in R/T

Kris Kristofferson · 09-02-2010, 12:10 PM

I found that when I stalled at 2000 I could still hold the car, this was with a old and likely "not functioning very well " convertor..I have since replaced it with a Hughes Pro-Stree unit that stalls at approx 3000..it will be interesting to see how the car reacts. It is a heavy car 3900 lbs 468 BBC .231@50 cam..

So, I guess that the theory is if you are footbraking at 2000 and the convertor is 3000 than it takes "less time" to go from 2000-3000 than 1000-3000?

I am running front runners with 165-70-15 radials@40 psi.

Phillip marvetz · 09-02-2010, 12:06 PM

Maybe you should just shallow stage and try the different launch RPMs. If that thing 60 foots better than a 2.0 you shouldn't need to go deep.

bottombulb · 09-02-2010, 02:40 PM

Quote:

Originally Posted by Phillip marvetz

Maybe you should just shallow stage and try the different launch RPMs. If that thing 60 foots better than a 2.0 you shouldn't need to go deep.

I 60 foot 1.39-1.41 shallow staged, and can't be better than .035 on the tree.

Ed Fernandez · 09-02-2010, 03:25 PM

[QUOTE=bottombulb;207427]I 60 foot 1.39-1.41 shallow staged, and can't be better than .035 on the tree.[/QUOTe

XX

Ed Fernandez · 09-02-2010, 03:27 PM

Quote:

Originally Posted by bottombulb

I 60 foot 1.39-1.41 shallow staged, and can't be better than .035 on the tree.

Have you checked your pulse lately?Just kidding.
I go 1.77-1.79 @ 60'.6cylinder 3040 # and have no trouble .010-.030,if my mind is there.And i'm 65 years old.

72Malibu · 09-02-2010, 09:11 PM

I leave at <1500 rpms or I'll go red

bottombulb · 09-02-2010, 09:53 PM

Quote:

Originally Posted by 72Malibu

I leave at <1500 rpms or I'll go red

Me too!!!! (deep though)

Kris Kristofferson · 09-03-2010, 08:23 AM

Hey Bob, I don't know about all that wasted motion happening...

The car 60ft's in the 1.6 region, I finally got it back on the road last night, hopefully race Sat or Sun..

Kris

Bench Racer · 09-02-2010, 02:25 PM

I was chatting with someone at the ATI trailer about converters a couple of years ago. I asked about staging RPM's having any effect on the performance of a superstock combo. If I understood him correctly he stated that if a converter was set to flash 5200 with your combination it will do it if you stage at 2500 or 4500. This did not take into account an issue with a carb that that has not had the accelerator pump set up properly and stumbles when you nail it at low RPM. He also said many times a car will be quicker if you "hit" the converter from a low RPM vs max stall, but different stage RPM's will alter your reaction times. Don Jackson

09-02-2010, 12:10 PM	#1
Kris Kristofferson Junior Member Join Date: Nov 2009 Location: Ottawa, Ont Posts: 68 Likes: 1 Liked 0 Times in 0 Posts	Re: higher staging rpm stall speed= reduction in R/T I found that when I stalled at 2000 I could still hold the car, this was with a old and likely "not functioning very well " convertor..I have since replaced it with a Hughes Pro-Stree unit that stalls at approx 3000..it will be interesting to see how the car reacts. It is a heavy car 3900 lbs 468 BBC .231@50 cam.. So, I guess that the theory is if you are footbraking at 2000 and the convertor is 3000 than it takes "less time" to go from 2000-3000 than 1000-3000? I am running front runners with 165-70-15 radials@40 psi.

09-02-2010, 12:06 PM	#2
Phillip marvetz Senior Member Join Date: Oct 2008 Location: Lynden ,WA Posts: 820 Likes: 0 Liked 3 Times in 3 Posts	Re: higher staging rpm stall speed= reduction in R/T Maybe you should just shallow stage and try the different launch RPMs. If that thing 60 foots better than a 2.0 you shouldn't need to go deep. __________________ 2009 V/SA Record Holder

09-02-2010, 03:25 PM	#4
Ed Fernandez Veteran Member Join Date: Nov 2001 Location: NOO JOISEY nexta NOO YAWK Posts: 5,879 Likes: 38 Liked 100 Times in 45 Posts	Re: higher staging rpm stall speed= reduction in R/T [QUOTE=bottombulb;207427]I 60 foot 1.39-1.41 shallow staged, and can't be better than .035 on the tree.[/QUOTe XX __________________ Former NHRA #1945 Former IHRA #1945 T/SA Last edited by Ed Fernandez; 09-02-2010 at 11:10 PM.

09-02-2010, 09:11 PM	#6
72Malibu Junior Member Join Date: Nov 2008 Location: Republic,Mo Posts: 93 Likes: 0 Liked 0 Times in 0 Posts	Re: higher staging rpm stall speed= reduction in R/T I leave at <1500 rpms or I'll go red __________________ * 72 Malibu * 1.329-3.99-6.28@106.71-9.98@131 best 60ft to date-1.2997

09-03-2010, 08:23 AM	#8
Kris Kristofferson Junior Member Join Date: Nov 2009 Location: Ottawa, Ont Posts: 68 Likes: 1 Liked 0 Times in 0 Posts	Re: higher staging rpm stall speed= reduction in R/T Hey Bob, I don't know about all that wasted motion happening... The car 60ft's in the 1.6 region, I finally got it back on the road last night, hopefully race Sat or Sun.. Kris

09-02-2010, 02:25 PM	#9
Bench Racer Member Join Date: May 2002 Location: Green Creek (Tryon) North Carolina Posts: 331 Likes: 69 Liked 99 Times in 21 Posts	Re: higher staging rpm stall speed= reduction in R/T I was chatting with someone at the ATI trailer about converters a couple of years ago. I asked about staging RPM's having any effect on the performance of a superstock combo. If I understood him correctly he stated that if a converter was set to flash 5200 with your combination it will do it if you stage at 2500 or 4500. This did not take into account an issue with a carb that that has not had the accelerator pump set up properly and stumbles when you nail it at low RPM. He also said many times a car will be quicker if you "hit" the converter from a low RPM vs max stall, but different stage RPM's will alter your reaction times. Don Jackson