Re: Starting line ratios for 1/8 mile
[Re: RustyM]
#2559117
10/04/18 10:42 PM
10/04/18 10:42 PM
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Joined: Jan 2003
Posts: 10,011 Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,011
Frostbitefalls MN (Rocky&Bullw...
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If you are a dedicated bracket racer,or similar, run the SLR that you can be consistant with in most any situation. Who cares if you are down a few hp at the stripe? Only someone that also wants to go faster. It is tough to do both well.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Starting line ratios for 1/8 mile
[Re: gregsdart]
#2559216
10/05/18 02:03 AM
10/05/18 02:03 AM
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Joined: Feb 2011
Posts: 1,454 Glendora Ca.
Just-a-dart
pro stock
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pro stock
Joined: Feb 2011
Posts: 1,454
Glendora Ca.
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If you are a dedicated bracket racer,or similar, run the SLR that you can be consistant with in most any situation. This is my take on it too, then gear the car for the stripe RPM you want.
"Just a Bracket car dressed up like a streetcar"
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Re: Starting line ratios for 1/8 mile
[Re: RustyM]
#2559252
10/05/18 04:10 AM
10/05/18 04:10 AM
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Joined: Oct 2009
Posts: 1,267 North, Alabama
D-50
pro stock
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pro stock
Joined: Oct 2009
Posts: 1,267
North, Alabama
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I am sort of in the same boat. I am about to buy new gears and don't know what to buy. I only run 1/8 mile. I was running 4.56 with my 30 inch tall drag radials and it was not turning but a little above 6000 at the finish line. I could probably go through in second. I would like to turn around 7000 at the finish line. My motor made peak HP at 7300 on the Dyno. It is a 3.79 stroke 340. (394 ci). Any ideas ?
1.33 60 ft,6.21 at 110.59 in the 1/8, pump gas small block,2950lbs,drag radials,mufflers and driven to track ...
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Re: Starting line ratios for 1/8 mile
[Re: D-50]
#2559270
10/05/18 08:27 AM
10/05/18 08:27 AM
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Joined: Jan 2003
Posts: 5,762 Hot Rod Ridge
FastmOp
master
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master
Joined: Jan 2003
Posts: 5,762
Hot Rod Ridge
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I am sort of in the same boat. I am about to buy new gears and don't know what to buy. I only run 1/8 mile. I was running 4.56 with my 30 inch tall drag radials and it was not turning but a little above 6000 at the finish line. I could probably go through in second. I would like to turn around 7000 at the finish line. My motor made peak HP at 7300 on the Dyno. It is a 3.79 stroke 340. (394 ci). Any ideas ? 5.13 gear
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Re: Starting line ratios for 1/8 mile
[Re: RustyM]
#2559273
10/05/18 08:48 AM
10/05/18 08:48 AM
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Joined: Jan 2005
Posts: 4,243 Charlotte, North Carolina
sgcuda
master
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master
Joined: Jan 2005
Posts: 4,243
Charlotte, North Carolina
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I don't think we have any more tracks running 1/4 down here. like to see car go through beams at 62-6400. We have tried shift points between 5500-6700, not making much difference- rpm curve in 3rd is barely above flat and, of course, we aren't there long.
if we still had some 1/4 mile stuff here then i would agree on setting up for that and it runs what it runs in the 1/8, but 1/8 is the new norm down here. What gear do you have and what rpm are you going over the stripe at now? It's easy enough to calculate what gear changes you will need. You won't have to worry about SLR or converter slip since those numbers are worked into your combo already.
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Re: Starting line ratios for 1/8 mile
[Re: RustyM]
#2559368
10/05/18 01:04 PM
10/05/18 01:04 PM
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Joined: Jan 2003
Posts: 10,011 Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,011
Frostbitefalls MN (Rocky&Bullw...
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Besides the ability to hook consistantly, when the sfifts occur can have a big effect. For a class not allowing an air shifter on an rpm switch or similar setup, your ETs can vary a lot in a faster car. I noticed my ETs tighten by 0.01 to 0.02, because the 1/2 shift was just after the wheelstand. So the further out those shifts are, the more accurate the driver can be.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Starting line ratios for 1/8 mile
[Re: RustyM]
#2559435
10/05/18 02:39 PM
10/05/18 02:39 PM
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Joined: Feb 2017
Posts: 566 Texas
RustyM
OP
mopar
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OP
mopar
Joined: Feb 2017
Posts: 566
Texas
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Foot break/class index racing has certain limitations. Getting back into this after so, so many years out , almost daily i find another scenario where I think: Wow, a transbreak solves that, transbreak makes that math easier, gives this a better tuning window etc. Not sure how i feel about air/electric shifters yet but can certainly see the advantages as a tuner- grin, I don't have to look and see where the driver shifted- grin. Consistency simply has to be better when everything is as expected .
I hope to get a really decent weather station this winter and more data gathering tools, but right now, I want to get another full tenth out of this car by next weekend . I hope no one get's offended but i'm that guy that always wants to beat the teeth out of whatever is in the next lane over-just been that way since a kid riding tricycles. I get a honest tenth, which gives me a little tuning window, some good air to spread that window a tiny bit and its time to hand out denture cream - grin
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Re: Starting line ratios for 1/8 mile
[Re: RustyM]
#2559442
10/05/18 02:45 PM
10/05/18 02:45 PM
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Joined: Aug 2011
Posts: 2,864 Pattison Texas
CSK
master
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master
Joined: Aug 2011
Posts: 2,864
Pattison Texas
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Have you done some Ign timing changes?
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
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Re: Starting line ratios for 1/8 mile
[Re: RustyM]
#2559454
10/05/18 03:05 PM
10/05/18 03:05 PM
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Joined: Jan 2003
Posts: 14,506 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,506
So. Burlington, Vt.
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My experience has been........ there’s rarely a good way around just trying things in the car and seeing how it responds.
Converters for example........ you could have two(or more) that have the same stall speed, yet run different ET’s. Only way to know which is better in your particular combo is to test them both. Not fun....... but when you’re looking for every thou...... that’s what it takes.
It’s more about figuring which parts interact the best with each other, rather than one part being “better” than another.
SLR for my friends stocker is about 15....... on a 9x30 tire. Best 60’ of 1.41....... with ET’s around 10.50.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Starting line ratios for 1/8 mile
[Re: fast68plymouth]
#2559479
10/05/18 03:39 PM
10/05/18 03:39 PM
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Joined: Feb 2017
Posts: 566 Texas
RustyM
OP
mopar
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OP
mopar
Joined: Feb 2017
Posts: 566
Texas
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Thanks Dewayne. I think we have done pretty well this year with "the formula" ; we took your advice and went to engine dyno after chassis dyno- found what the engine liked, saw the chassis loss, were able to make good converter decisions . Guys here helped us with finding chassis set-up problems and solutions ( we still have some things to make better after the season but- whew what a difference)- car prints really consistent paper now, even as we move the car forward. Car was trapped between two indexes and we made the decision to use this season to continue getting the car dialed in and up while still trying to stack points, its not been a bad year at all, still in top 4 in points.
We would have been in finals this last race but, i made a mistake: I didn't look up at the boards in time to see they had our dial in wrong and stop the tree. Stupid, stupid, stupid error- completely avoidable. Over concentrated on car, did go through check down. They dialed us in .54 under our dial and we still could have won but my driver thought other car was bagging and it was a case of who broke out the worst, he peddled based on our regular dial. Yep to testing/testing/testing but, gotta stay on top of things too, not break process. I ,,, just,,,screwed,,,up.
Of course we all feel like we should have caught it but i'm the guy that could have stopped the car/tree- its on me.
Bet it wont ever happen again- grin.
I think the .88 is going to work, been over my data a ton, the car "should" like it. If we can control the hit and again about car length out with the shocks/chassis tuning we have available right now, we should be gold. Alas, math and computers aren't races or cars so, take a shot, try to work it, if not, fall back , try again.
This community has truly been a blessing and helped us have a lot of fun.
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