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Re: Track Results 508" B1
[Re: rb446]
#2816733
09/03/20 04:07 PM
09/03/20 04:07 PM
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Joined: Jan 2003
Posts: 14,514
So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
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Posts: 14,514
So. Burlington, Vt.
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Be interesting to see what happened with the exhaust opened up.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
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Re: Track Results 508" B1
[Re: mopar dave]
#2816737
09/03/20 04:12 PM
09/03/20 04:12 PM
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Joined: Oct 2015
Posts: 570
UK
rb446
mopar
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mopar
Joined: Oct 2015
Posts: 570
UK
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Just keep adding hp til it matches the mph on your slip. Thats what I've been doing for years, wrong?
1969 'Cuda 446ci, best 9.96@133.9 in 1990
1971 340 'Cuda, best 11.01@122.8 in 1987
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Re: Track Results 508" B1
[Re: rb446]
#2816745
09/03/20 04:36 PM
09/03/20 04:36 PM
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Joined: Jan 2003
Posts: 14,514
So. Burlington, Vt.
fast68plymouth
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I Live Here
Joined: Jan 2003
Posts: 14,514
So. Burlington, Vt.
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I’m not sure where you’re going with that........
If you want to get a better idea of how much power is being lost with the motor going from the dyno to the car, you need accurate weather data from when the runs are made, and having the actual track elevation too.
Then correct the runs to a std day at sea level.
The difference between the calculated std day hp and the STP power from the dyno is what is being wasted in the car.
One of the new Wallace calculators takes the drag run data, and weather data...... gives you a net power rating, and a correction factor for STP power(at least, that’s what I think the correction factor is doing).
Since we have all that data for Wades last track outing, it shows:
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
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Re: Track Results 508" B1
[Re: fast68plymouth]
#2816757
09/03/20 05:30 PM
09/03/20 05:30 PM
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Joined: Jan 2003
Posts: 31,092
Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 31,092
Oregon
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Have you found the Moroso slide rule to be fairly accurate compared to actual dyno results? I have. But you have to look at the whole situation....... da, how good the car is, head wind or not, track prep, etc....... and then there is always the question about how accurate the dyno numbers are. In decent(but not killer) air, a good stock or super stock car will outrun the Moroso chart..... and often by quite a bit. (Using the Moroso chart, my friends Stocker has run enough speed show the hp to be 108% of what the STP power was on the dyno. Even racing in Vegas the car shows within 5% of the STP power, and that’s a track with an altitude adjustment factor). A mediocre street/strip car may have a hard time showing within 15% of the dyno numbers, and a typical half way decent bracket car should be able to get within 10%. And a car that’s not set up for the track at all might show numbers that are 20-25% low. One of the cars I've been helping out with this year has gone thru the learning curve from being a mid 10 second car to now a 9.70 car without changing a single part on the engine. The driver has refined his driving and picked up time by getting his launch and shift points correct. The engine made a little over 700 hp on the dyno and the car is around 3500 lbs so it should run 9.70 or so on the Moroso slide rule but it started out in the mid 10's. At first the owner didn't believe the Moroso slide rule numbers and he was questioning the dyno numbers but it all gradually fell into place.
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Re: Track Results 508" B1
[Re: AndyF]
#2816808
09/03/20 08:47 PM
09/03/20 08:47 PM
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Joined: Oct 2015
Posts: 570
UK
rb446
mopar
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mopar
Joined: Oct 2015
Posts: 570
UK
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Got it> ![[Linked Image]](https://i.ibb.co/n0gQY92/DA.jpg) However the dyno didn't have an exhaust system on it, we do, how much is that worth? And I'd certainly go along with Andy's comments about the driving in our case, we started with 11.3's>10.7's>10.4's
Last edited by rb446; 09/03/20 10:01 PM.
1969 'Cuda 446ci, best 9.96@133.9 in 1990
1971 340 'Cuda, best 11.01@122.8 in 1987
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Re: Track Results 508" B1
[Re: rb446]
#2816933
09/04/20 09:49 AM
09/04/20 09:49 AM
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Joined: Jan 2003
Posts: 14,514
So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,514
So. Burlington, Vt.
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However the dyno didn't have an exhaust system on it, we do, how much is that worth? There is a way to answer that question.  Taking the net hp and multiplying it by the correction factor for that run gets you within 30-35hp of your dyno numbers. I have to believe that “some” of that missing power is being lost with the exhaust system. Did you try the 1/4 mile version of that calculator to see how the numbers compare?
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
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Re: Track Results 508" B1
[Re: mopar dave]
#2816941
09/04/20 10:18 AM
09/04/20 10:18 AM
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Joined: Jan 2003
Posts: 11,730
Portage,michigan
B3422W5
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I Live Here
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Posts: 11,730
Portage,michigan
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Well, maybe convertor slippage needs to be figured in as well. That calculator hit my numbers almost dead nuts for MPH. The ET is off a fraction, but that's the chassis. I think it was Dwayne that said my motor should be making 680hp, 675 is pretty close. What has your car ran Dave
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, low 10.30’s 1/4
1.41 best 60 foot
6.56 at 104.17
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Re: Track Results 508" B1
[Re: mopar dave]
#2816950
09/04/20 10:43 AM
09/04/20 10:43 AM
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Joined: Jan 2003
Posts: 11,730
Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,730
Portage,michigan
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Wade, what are the pro's and con's of using alcohol/E85? I have been thinking about making the switch from race fuel to E85. Mph looks good! My blue car ran 135 at 3350. We figured a true 640-645 horse. New owner got it to 140 mph at 3220. Some nice upgrades were done.. That aligned nicely with the 708 dyno number the motor showed then.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, low 10.30’s 1/4
1.41 best 60 foot
6.56 at 104.17
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Re: Track Results 508" B1
[Re: fast68plymouth]
#2816991
09/04/20 12:20 PM
09/04/20 12:20 PM
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Joined: Oct 2015
Posts: 570
UK
rb446
mopar
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mopar
Joined: Oct 2015
Posts: 570
UK
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However the dyno didn't have an exhaust system on it, we do, how much is that worth? There is a way to answer that question. Taking the net hp and multiplying it by the correction factor for that run gets you within 30-35hp of your dyno numbers. I have to believe that “some” of that missing power is being lost with the exhaust system. Did you try the 1/4 mile version of that calculator to see how the numbers compare? This was our best mph run, short shifted first he said......Wallace suggests that to get your mph/hp the same @10.47ET it would need to be 130+, how many cars run 130+@10.4's, unless there 60 really sucks, ours was a 1.47 on that which sucks!!, guess the 2mph is in the exhaust?. [ ![[Linked Image]](https://i.ibb.co/2ZsFRk4/DA2.jpg)
Last edited by rb446; 09/04/20 12:41 PM.
1969 'Cuda 446ci, best 9.96@133.9 in 1990
1971 340 'Cuda, best 11.01@122.8 in 1987
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Re: Track Results 508" B1
[Re: rb446]
#2817050
09/04/20 02:48 PM
09/04/20 02:48 PM
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Joined: Jan 2003
Posts: 14,514
So. Burlington, Vt.
fast68plymouth
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I Live Here
Joined: Jan 2003
Posts: 14,514
So. Burlington, Vt.
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A friend of mine bought a used motor Monday, had it on the dyno Wednesday, it’s in the car at the track today.
Motor dynoed at 728hp.
There is also a slight head wind(8-9mph) at the track today.
The Moroso chart shows 665hp for the speed(144), which is within 10%(8.7%) of the dyno numbers.
It shows 695hp for the ET (9.21) which is within 5%.
Wallace shows:
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
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Re: Track Results 508" B1
[Re: fast68plymouth]
#2817063
09/04/20 03:38 PM
09/04/20 03:38 PM
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Joined: Aug 2011
Posts: 2,874
Pattison Texas
CSK
master
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master
Joined: Aug 2011
Posts: 2,874
Pattison Texas
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A friend of mine bought a used motor Monday, had it on the dyno Wednesday, it’s in the car at the track today.
Motor dynoed at 728hp.
There is also a slight head wind(8-9mph) at the track today.
The Moroso chart shows 665hp for the speed(144), which is within 10%(8.7%) of the dyno numbers.
It shows 695hp for the ET (9.21) which is within 5%.
Wallace shows: So if you applied the 1.05 correction factor to the Moroso # 695 X 1.05 = 729 ??
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: Track Results 508" B1
[Re: fast68plymouth]
#2817066
09/04/20 03:43 PM
09/04/20 03:43 PM
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Joined: Jan 2003
Posts: 14,514
So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,514
So. Burlington, Vt.
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Wallace suggests that to get your mph/hp the same @10.47ET it would need to be 130+ The Moroso chart and Wallace don’t agree with each other with how the ET/Speed correlate to each other. On the Moroso chart the 127.5mph shows an ET very close to what you guys ran.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
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Re: Track Results 508" B1
[Re: CSK]
#2817069
09/04/20 03:52 PM
09/04/20 03:52 PM
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Joined: Jan 2003
Posts: 14,514
So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,514
So. Burlington, Vt.
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A friend of mine bought a used motor Monday, had it on the dyno Wednesday, it’s in the car at the track today.
Motor dynoed at 728hp.
There is also a slight head wind(8-9mph) at the track today.
The Moroso chart shows 665hp for the speed(144), which is within 10%(8.7%) of the dyno numbers.
It shows 695hp for the ET (9.21) which is within 5%.
Wallace shows: So if you applied the 1.05 correction factor to the Moroso # 695 X 1.05 = 729 ?? Well, Wallace shows the HP as 686...... so that x 1.05 is 720. Pretty close. 728hp on the dyno x .955 = 695hp.......only 4.5% off. It just so happens the correction on the dyno was about 5% too.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
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