Bonneville Landspeed Racing - Let's Try a Thing.
- Thread starter 71GSSDemon
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Wait....do you wear coats in Cali?
What i mean is if I reach top rpm too soon, then there could be more on the table but I'd be out of rpm or out of gear, so to speak. For now it's a mild steel crank 383.
Gotcha. I can look at the QC closer as to what it needs. Both axles need brakes and such. The 8 3/4 has a known good center diff with 2.94 and spool.
As of right now, it seems to be the best fit to try the 150 Club, but concentrate on passing Tech inspection and get rookie runs in.
TT5.9mag
Two atmospheres are better than one
Not often. Usually a hoodie gets the job done. It’s been in the 40s overnight but still mid 60s during the day.
Balh blah blah...lol. was -30 windshield the other day. Back to single digits this weekend.
As requested Sir...
So, gearing. Need to check on tires as I have the tubs mounted high. Should be able to fit a 35" tire without issue. I reworked some wheel spacers this AM to move the front tires out and to allow clearance to run 15" wheels which greatly opens up tire size availability. I will plan to not use the OD for now. It will come down to either the current 2.94s or 2.76 that I can get from a friend who will never use them. If I run the 150 club to start with, I wont need all the equipment for class records that are 100mph faster than I will be going, but no runs count towards a competition license. That said, to go 150-159 with the 2.94 gears, that is 5500rpm and 5000 rpm with the 2.76. Both should be doable. The 2.50 gear would be down to 4600 which seems wrong.
So, playing around with the formulas from Landracing.com I made a formula sheet to plug in the numbers to see what it takes on paper for HP required at a given speed with a known Coefficient of Drag and Frontal Area.
The Frontal Area of the Charger is just under 27 cf and the coefficient of drag for the Nascar versions was 0.375. Interesting to plug the numbers in and play around.
The Frontal Area of the Charger is just under 27 cf and the coefficient of drag for the Nascar versions was 0.375. Interesting to plug the numbers in and play around.
Also, need corrected hp due to elevation of 4226ft.
TT5.9mag
Two atmospheres are better than one
Nope. No thanks. No way. Not for me.
TT5.9mag
Two atmospheres are better than one
Yup, no more just talking about it. Gotta get after it. So, unless the car is a complete undriveable mess, major catastrophe, or weather. We will be there!You realize now you have to accomplish something right?
I added in transmission ratios with speed/tire/rpm variables that can be entered in and manipulated. For 150 Club , it shows 288.91 wheel hp and maybe ~5500 rpm in 3rd. Going to have to do any and all aero tricks I can think of and afford.
TT5.9mag
Two atmospheres are better than one
Remember way back on page 1 or2 when I said “if the math says you need 800hp, build 1000hp”. Keep that in mind.
Yeah I remember, and I know I need lots more HP, but also trying to stay as positive about every aspect of this adventure - speed included. I hope it will do 150-159
Yes, I follow Superfast Matt. I do really enjoy how he explains things. "if you want to do something right, then do it wrong first"
TT5.9mag
Two atmospheres are better than one
I don’t think you need “lots” more hp to get to 150-159mph. But I wouldn’t show up with 288 and that goal in mind. I think I’d aim for about 400 which is logical and easily doable.
I meant lots for the overall speed goal. I hope with the aero mods and the HP I have, I can get to the 150 Club.
So, I believe we struck a deal on a pair of 32" Dunlop LSR tires on 19" solid aluminum rims that were on a streamliner. With that height, I may run the 3.23 gears from the Demon. That "will" equate to 156mph at 5300rpm. This seems more realistic I think. More RPM available to account for wind, race surface, etc. I think so at least. The only real issue I can think of is if it makes the car too high. The car was set up with 26" tires as it sits now. Raising 3" may not work and lowering blocks can only be so big.
To build on this.... what is the max lowering block people would use? I could modify the pinion snubber or contact point to help with leaf spring wrap up or tire shake. Now I wish I had put the car on bags....
To build on this.... what is the max lowering block people would use? I could modify the pinion snubber or contact point to help with leaf spring wrap up or tire shake. Now I wish I had put the car on bags....
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TT5.9mag
Two atmospheres are better than one
2” is about as big of a block as I’ve used and been comfortable with on just about anything. More than that and axle wrap starts to be a problem. Alter the mounting point for the springs if you have to.
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