I'd like your thoughts on this 360
LOL.... nobody putting you on the ignore list. :) You gave some reasons why it won't work, and I like the feedback! Please give an estimate on what E.T. you think it will run?
Before I get caught with my pants down again;
How what will run?
I have no experience. I only can work off the charts and formular Chrysler worked out in the 60s and seventys. They are very comprehensive, but always assume unlimited SuperStock Type suspension. The charts assume you will be running slicks, SS springs, a traction aider and the correct rear gear.That your car will tu at an advantageous rear weight bias and have proper weight transfer.
We already know a guy can lose.3 to .5 right on the start line, with a feeble starter gear and tire spin. And we can lose another .3 to .5 trapping in second gear at 4400 say. So guessing on an unrun combo is pure speculation.
The charts are organized purely as to power to weight ratios; saying a P/W of such and such will run so many mph. Another chart shows if you ET at such and such, your P/W is such and such. And when the two don't match, then you can figure out what to do about it.
Lets take a 70 Swinger 340 4-speed/3.55s for example. Mine weighed in at 3330 with me in it,in the summer of 71, and I ran it in pure stock. The engine was factory-rated at 275, and factored to 290,IIRC by the NHRA back in the day So we have some numbers. The P/w is 3330/290=11.48 And that should run.....about 104 mph. Mine ran 98and change, I can't recall, mph. This shows I was down at a P/W of 13.1 say, which is 3330/13.1=254 hp, so it was tired,or well off a good tune. This car turned 14.4 so the chart says I was at a P/W of 17.24. I shoulda turned 12.7 according to the P/W selected for the 290hp. And I shoulda turned 13.3 with 254 hp. So, one can see that the street suspension/gearing cost me 14.4 less 13.3=1.1 seconds. And the lazy tune cost me 14.4 less 12.7, less 1.1=0.6seconds.
Next take my tired old 71 Demon 904 hiway geared DD. IIRC it turned 79mph and 15.9 or something. The 79mph says it had a P/W of 23.2. And Ima thinking it scaled about 3450 that day . Well 3450/23.2 is 149 hp.
And the 15.9 is nearly off the chart at a P/W of 22.7. So these two are sortof agreeing; 3450/22.7=152 hp. There could be little to no improvement. in making any changes.
But consider this; that 318 was factory-rated at 230hp! It shoulda had a P/W of 3450/230=15.0. It shoulda gone 93mph with unlimited suspension. And the ET for 15.0 is 14.0.
Now earlier it was shown that the street suspension on the Swinger cost me 1.1 seconds. Adding that to the theoretical ET of 14.0 we get 15.1 seconds. The rest is in the powerloss, in this case costing an additional 15.9 less 15.1= .8 seconds. The power loss can thus be computed using the charts. Then you have to figure out why.
So now if you have a 74 Dart at 3600 raceweight, or was it a Duster? Yeah I think a Duster, so make it less of a tank at 3450 raceweight,say. With a tired 360. But the charts don't account for tired so; Lets call it a 230 hp. 3450/230=a P/W of 15 and that
should go 93. And the ET for that is 14.0. then add 1.1 for the chassis and .6 for the tune, and we come up with a best of 15.7.Now you can compensate slower with a tired engine. lets say it's really down at 180 hp, you measured it on a dyno. Then 3450/180=a P/W of 19.17 which is
about 85 mph, and that should hit 15.3. To that you can add the 1.1 chassis fudge and come up with
16.3 seconds for an ET. But your chassis could be worse than mine; remember I was running 3.55s. With 2.45s who knows how much slower it might run. I could
guess another .5 second. So now we're up to 16.8. But maybe 3450 is not accurate. Maybe your transmission slips. Maybe it's hot that day and your engine just won't pull. Maybe you short shift it so bad the engine never gets on the pipe. Maybe the muffler is severly restricted. Maybe the chassis has a big ol'drag on it sucking it's own horsepower right off the top. Maybe the TC in no good. Maybe the front end is like a parachute.
Just too many variables.
The charts can spit out a nice ideal number with just a race-weight and crankshaft power. That's pretty amazing.
But what if you had a CVT, and were pulling at the peak-rated power, from start to finish? Well that's not in the charts either. Nor is running more than 4 gears or less than 3. In fact in typical street speeds from 100 to 112, the chart always shows the mph to be about 2 mph higher with a manual trans, and in those years it was the A833.
