|
Re: Starting line ratios for 1/8 mile
[Re: RustyM]
#2559599
10/05/18 07:17 PM
10/05/18 07:17 PM
|
Joined: Feb 2017
Posts: 566
Texas
RustyM
OP
mopar
|
OP
mopar
Joined: Feb 2017
Posts: 566
Texas
|
Agreed Doug.
Weather is really a big deal here in Texas and i hope to get a better weather station over the off season.
I also agree on getting to below the index- properly.
This owner wanted to be at 6.41 and so we set out to help him get there.
we got as much data from last year as possible, did as Dewayne suggested and did some dyno work , found where the engine lived, found converter issues- just did a lot of basic problem solving mechanically and then with yalls help we tackled chassis.
Once we got car safe/consistently repeating we knew we were gathering data to let us get where he wanted to be.
He was pretty happy when we hit 1.41 60ft and the first 6.48 n/a ( if i had time for two more passes, would have gotten .45-46 im sure).
So, not far to go, been a step at a time, get him under index and still predictably consistent and, well, thats a win/win deal to me.
I'm just hoping i did my work/math correctly and the .88 gears help as anticipated and don't hurt him instead.
Last edited by RustyM; 10/05/18 07:20 PM.
|
|
|
Re: Starting line ratios for 1/8 mile
[Re: RustyM]
#2559626
10/05/18 08:33 PM
10/05/18 08:33 PM
|
Joined: Feb 2011
Posts: 1,454
Glendora Ca.
Just-a-dart
pro stock
|
pro stock
Joined: Feb 2011
Posts: 1,454
Glendora Ca.
|
Rusty if you are going to make a big in change rear end ratio remind your driver to be on that 1-2 shift it is going to come at him faster.
"Just a Bracket car dressed up like a streetcar"
|
|
|
Re: Starting line ratios for 1/8 mile
[Re: RustyM]
#2559638
10/05/18 08:52 PM
10/05/18 08:52 PM
|
Joined: Jan 2003
Posts: 14,513
So. Burlington, Vt.
fast68plymouth
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 14,513
So. Burlington, Vt.
|
I'm curious....... how did 6.41 become the target?
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
|
|
|
Re: Starting line ratios for 1/8 mile
[Re: fast68plymouth]
#2559646
10/05/18 09:21 PM
10/05/18 09:21 PM
|
Joined: Feb 2017
Posts: 566
Texas
RustyM
OP
mopar
|
OP
mopar
Joined: Feb 2017
Posts: 566
Texas
|
That was one of his goal with stroking it, then all kinds of problems plagued him .
Once car was sorted, landed between two index's and would rather go forward than back.
He doesn't mind using a little weight in the car but doesn't want to be throwing 200-300 lbs in and out .
Heads may come to you after the season -1's
Honestly, could have gotten him closer last weekend we just ran out of time , had to dial back and just drive the car.
Car is just super lazy in high gear with the amount of track left, only builds a few hundred rpm back after the shift, never gets up on upper power band.
rpm graph just slightly above flat and hitting stripe at 55-5700, needs to be 6100 -6400 min.
I could be wrong but, if I can trim a little more off 60/330 and have him up on motor before stripe- car should finish well.
Tell me if you think im wrong.
My concerns are:
sticking the tire now.
Using up all the shock .
we are on 130# springs ( ladder bar car) , he had 200, car didnt like it, we tried 150# and it was better but still had min. weight transfer, used very little shock so, picking up front ties and just dropping them, went to 130# , using shocks much better, carrying fronts a little.
So, my thought, based on the math and what the car has been doing: But some more gear in it, if we can stick the tire , use all the shock, have a little more control on shock rebound , tire speed quicker, ups the stall 200, get in second and third quicker and be up on the head flow across the stripe.
Am i wrong?
|
|
|
Re: Starting line ratios for 1/8 mile
[Re: RustyM]
#2559662
10/05/18 09:50 PM
10/05/18 09:50 PM
|
Joined: Jul 2004
Posts: 19,318
State of confusion
Thumperdart
I Live Here
|
I Live Here
Joined: Jul 2004
Posts: 19,318
State of confusion
|
That was one of his goal with stroking it, then all kinds of problems plagued him .
Once car was sorted, landed between two index's and would rather go forward than back.
He doesn't mind using a little weight in the car but doesn't want to be throwing 200-300 lbs in and out .
Heads may come to you after the season -1's
Honestly, could have gotten him closer last weekend we just ran out of time , had to dial back and just drive the car.
Car is just super lazy in high gear with the amount of track left, only builds a few hundred rpm back after the shift, never gets up on upper power band.
rpm graph just slightly above flat and hitting stripe at 55-5700, needs to be 6100 -6400 min.
I could be wrong but, if I can trim a little more off 60/330 and have him up on motor before stripe- car should finish well.
Tell me if you think im wrong.
My concerns are:
sticking the tire now.
Using up all the shock .
we are on 130# springs ( ladder bar car) , he had 200, car didnt like it, we tried 150# and it was better but still had min. weight transfer, used very little shock so, picking up front ties and just dropping them, went to 130# , using shocks much better, carrying fronts a little.
So, my thought, based on the math and what the car has been doing: But some more gear in it, if we can stick the tire , use all the shock, have a little more control on shock rebound , tire speed quicker, ups the stall 200, get in second and third quicker and be up on the head flow across the stripe.
Am i wrong? Let's put a Dommy on that puppy...........  
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.....
|
|
|
Re: Starting line ratios for 1/8 mile
[Re: RustyM]
#2560109
10/06/18 10:02 PM
10/06/18 10:02 PM
|
Joined: Jan 2003
Posts: 10,015
Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 10,015
Frostbitefalls MN (Rocky&Bullw...
|
How much drop in rpm on the shifts? Sounds like you may need more stall. My converter is probably too tight yet, at 6200 after the shift of 7450 on the 1/2 , and 7350 on the 2/3 shift. My peak hp is 6900, peak torque about 5100. I go through the traps at 7400 in the 1/4.
Last edited by gregsdart; 10/06/18 10:06 PM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
|
|
|
Re: Starting line ratios for 1/8 mile
[Re: RustyM]
#2560752
10/08/18 10:47 AM
10/08/18 10:47 AM
|
Joined: Jan 2003
Posts: 13,380
Marion, South Carolina [><]
an8sec70cuda
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 13,380
Marion, South Carolina [><]
|
IMO, the combo laid out in the original thread should not have any trouble hooking w/ whatever SLR you throw in it.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
|
|
|
Re: Starting line ratios for 1/8 mile
[Re: rickseeman]
#2560910
10/08/18 03:09 PM
10/08/18 03:09 PM
|
Joined: Aug 2003
Posts: 43,274
Bend,OR USA
Cab_Burge
I Win
|
I Win
Joined: Aug 2003
Posts: 43,274
Bend,OR USA
|
Who wrote this book and how much DRAG racing have they done?
Last edited by Cab_Burge; 10/08/18 04:48 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
|
|
|
Re: Starting line ratios for 1/8 mile
[Re: RustyM]
#2560969
10/08/18 04:43 PM
10/08/18 04:43 PM
|
Joined: Oct 2007
Posts: 4,210
New York
polyspheric
master
|
master
Joined: Oct 2007
Posts: 4,210
New York
|
Never mind, it's a good book
Boffin Emeritus
|
|
|
Re: Starting line ratios for 1/8 mile
[Re: Cab_Burge]
#2561010
10/08/18 06:23 PM
10/08/18 06:23 PM
|
Joined: Jan 2012
Posts: 2,674
Stuttgart, Arkansas
rickseeman
master
|
master
Joined: Jan 2012
Posts: 2,674
Stuttgart, Arkansas
|
Who wrote this book and how much DRAG racing have they done? I think his name is Dick Miller. He has raced a long time and it is a good book.
2011 Drag Pak Challenger
|
|
|
Re: Starting line ratios for 1/8 mile
[Re: RustyM]
#2561147
10/08/18 11:15 PM
10/08/18 11:15 PM
|
Joined: Aug 2005
Posts: 637
Sao Paulo, Brazil
dart_73_br
mopar
|
mopar
Joined: Aug 2005
Posts: 637
Sao Paulo, Brazil
|
The book says it´s the maximum SLR. My car has a 2 points higher SLR than maximum accordinly to the book and my tires are spinning too much. Does it means if I decrease the SLR it would hook better and and improve 60"?
1973 Brasilian Dart
E100, boosted 390"
|
|
|
|
|
