Do these stop numbers sound right?

StompNDump · 06-01-2020, 10:24 AM

582 in a Davis Roadster, All out runs 850's
Dedenbear Delay Box, APD Max Speed carb
Launch 5200
Timer A1 - .125
A2 - 3.050
Shift (Timer) B1 - .200
B2 - .300

4100 RPM while on Stop

MPH was 152 and car ran a 10.56

Changed Timer A2 - 2.050 and car ran 10.19

I just got this car turn key and im kinda new to all this. Just wanted to see if these numbers looked correct or if there is something that looks incorrect. The 582 is nothing fancy, Id say a mid range 582 with the weakest link being BB2X Xtra Heads.

57 Vette · 06-01-2020, 12:17 PM

Is the Davis 57 model or a C5? I have a 57 Davis that has a 582 Head Hunter engine that makes around 1060 H/P. # 1 timer .007 # 2 3.500
Shift .020-off .040 I leave at 5,200 to 5,600 Rpm. All these numbers are depending on the Density Alt.

StompNDump · 06-01-2020, 01:02 PM

Its the C5 Davis
DA was 1803 Ft

57 Vette · 06-01-2020, 01:41 PM

The C5 model Davis is a good 100 lbs lighter than the 57 model and has better aerodynamics!

StompNDump · 06-01-2020, 02:45 PM

It was those numbers that had me guessing. I figured a engine that size running 8.50s would have carried more in the timers or at least close to where they were set, but unfortunately that ended in a 10.56 and 10.19, So it looks like this set up may only carry a second or so on stop.

Lenny5160 · 06-02-2020, 08:43 AM

If it were mine, I'd make the 'Stop On' time later and/or increase the RPM on the stop some so you can carry a little more time on the stop.

It is best if you can always be on the stop through the 60' timer so you have something that should stay constant run-to-run.

StompNDump · 06-02-2020, 10:37 AM

What would you recommend Lenny? Throw me some numbers and ill try them this weekend if i get to test.

Keith 944 · 06-02-2020, 05:40 PM

Quote:

Originally Posted by Lenny5160

If it were mine, I'd make the 'Stop On' time later and/or increase the RPM on the stop some so you can carry a little more time on the stop.

It is best if you can always be on the stop through the 60' timer so you have something that should stay constant run-to-run.

I totally agree with this
was going to mention this. i like a min of 2 sec duration on stop. ratio will be better and should be more consistent.

Keith 944 · 06-02-2020, 05:43 PM

Quote:

Originally Posted by StompNDump

What would you recommend Lenny? Throw me some numbers and ill try them this weekend if i get to test.

just bring the rpm up somewhere around 44-4600, see where you are, then if more needed bring the first (on) time out to maybe .5-1 sec

StompNDump · 06-03-2020, 08:26 AM

Ok Ill give this a try next time out with upping the RPMs to 4400. Would 300 RPM make a big difference?

Also Ill change Timer A1- to 1.000, would this be too much ?

06-01-2020, 10:24 AM	#1
StompNDump Junior Member Join Date: Nov 2019 Posts: 59 Likes: 0 Liked 3 Times in 3 Posts	Do these stop numbers sound right? 582 in a Davis Roadster, All out runs 850's Dedenbear Delay Box, APD Max Speed carb Launch 5200 Timer A1 - .125 A2 - 3.050 Shift (Timer) B1 - .200 B2 - .300 4100 RPM while on Stop MPH was 152 and car ran a 10.56 Changed Timer A2 - 2.050 and car ran 10.19 I just got this car turn key and im kinda new to all this. Just wanted to see if these numbers looked correct or if there is something that looks incorrect. The 582 is nothing fancy, Id say a mid range 582 with the weakest link being BB2X Xtra Heads.

06-01-2020, 12:17 PM	#2
57 Vette Junior Member Join Date: Jul 2018 Posts: 44 Likes: 342 Liked 38 Times in 14 Posts	Re: Do these stop numbers sound right? Is the Davis 57 model or a C5? I have a 57 Davis that has a 582 Head Hunter engine that makes around 1060 H/P. # 1 timer .007 # 2 3.500 Shift .020-off .040 I leave at 5,200 to 5,600 Rpm. All these numbers are depending on the Density Alt.

06-01-2020, 01:02 PM	#3
StompNDump Junior Member Join Date: Nov 2019 Posts: 59 Likes: 0 Liked 3 Times in 3 Posts	Re: Do these stop numbers sound right? Its the C5 Davis DA was 1803 Ft

06-01-2020, 01:41 PM	#4
57 Vette Junior Member Join Date: Jul 2018 Posts: 44 Likes: 342 Liked 38 Times in 14 Posts	Re: Do these stop numbers sound right? The C5 model Davis is a good 100 lbs lighter than the 57 model and has better aerodynamics!

06-01-2020, 02:45 PM	#5
StompNDump Junior Member Join Date: Nov 2019 Posts: 59 Likes: 0 Liked 3 Times in 3 Posts	Re: Do these stop numbers sound right? It was those numbers that had me guessing. I figured a engine that size running 8.50s would have carried more in the timers or at least close to where they were set, but unfortunately that ended in a 10.56 and 10.19, So it looks like this set up may only carry a second or so on stop.

06-02-2020, 08:43 AM	#6
Lenny5160 Senior Member Join Date: Nov 2015 Location: Inver Grove Heights, MN Posts: 898 Likes: 604 Liked 432 Times in 225 Posts	Re: Do these stop numbers sound right? If it were mine, I'd make the 'Stop On' time later and/or increase the RPM on the stop some so you can carry a little more time on the stop. It is best if you can always be on the stop through the 60' timer so you have something that should stay constant run-to-run. __________________ S/ST 51 S/C 53

06-02-2020, 10:37 AM	#7
StompNDump Junior Member Join Date: Nov 2019 Posts: 59 Likes: 0 Liked 3 Times in 3 Posts	Re: Do these stop numbers sound right? What would you recommend Lenny? Throw me some numbers and ill try them this weekend if i get to test.

06-03-2020, 08:26 AM	#10
StompNDump Junior Member Join Date: Nov 2019 Posts: 59 Likes: 0 Liked 3 Times in 3 Posts	Re: Do these stop numbers sound right? Ok Ill give this a try next time out with upping the RPMs to 4400. Would 300 RPM make a big difference? Also Ill change Timer A1- to 1.000, would this be too much ?