Demon Rear Wheels
TF360
This is not directed specifically at you so don't take umbrage
I run 295s INSIDE my 68 Barracuda wheel wells, with the body dropped down over them, a bit, cuz I like it low. And I NEVER think about them Cuz rubbing is a non-issue.
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I fit 325s in that same set-up, and in a straight line, it's a non-issue. And driving nice, turns aren't either. I just can't charge as hard as I like to. I have set it up to rub on the inboard side, and smoothed the part where it consistently rubs, so it doesn't damage the sidewall. It's about a quarter inch there, and close to a half on the outboard. My springs are running nearly flat,ie; almost no camber, and I run the poly stuff.So my body sways very little back there. But I run 24psi in the 325's cuz they are on 10s, which is really not enough width.If I ran more, I would ruin those expensive DRs pretty quick. And even with the sidewall roll-over, they don't get into the relocated springs. The 325s are not totally inside the wells; the outboard sidewall is flush with the body line. So I had to fold the lip up and a little tighter to the body. So now I have about 1.5 inches (from memory) of allowable suspension jounce. Yes,I run spacers; that's what long studs are for. IIRC ( It's been a very long time since I checked), I run .25 on one side, and .125 on the other; so I guess you could say I goofed when I welded the perches in, because I originally planned to run .25 on each side,lol.
This is what HotRodding is all about; making stuff work.
A hot teener or even a warm360, has traction issues. Why bother building a 350/400 hp streeter just to shoe it with 245s or maybe 255s. IMO,That's insanity. So you got $4000 or maybe $6000 in your engine, and the guy next door with his punk tuner car embarrasses you every chance he gets. What? You say you ignore him? Need I say more?
The bottom line is; a stout 360, without traction aides, spins even 325s to 60,70 and more, mph. So why would someone put skinny rollers back there? Even my winter engine spun old hard 275/50-15s a good ways with a 10.97 starter gear, and it was a factory original 1973 teener with just; a re-ring, a TQ, and the exhaust system of my summer 367. That was actually a very fun winter combo.
Okay, I know a Barracuda is not a Duster/Demon......I believe it has about a half to one inch more room before you start massaging. But from 295 on 10s, to 275 on 8/8.5s, is 2 full inches.
Now, in case we forgot, here is the OPs origial query
I'm new to the club and I'm sure this question has been asked many times in the past. My question is what width wheels are the widest that will fit in a typical A Body (In my case a 71 Demon)? Basically I'd like to run 15 x 8 wheels but I need to know if they will clear and if so what backspacing should they be. Thanks in advance.
So I guess my answer to the first question,would be; With relocated SS springs and long shocks, you could maybe get 325 on 10s, back there. But you might be ticketed for the part that sticks out past the bodyline. So to avoid the tickets, make it 295s.
And as to the second question; For a streeter, about the widest you can put on an 8 is a 275/60, and still run reasonable pressure of about 28psi. If you put a 275/
50 on there, You will have to drop the pressure pretty close to 24. And 24 handles like crap, until you are spinning BOTH tires in second gear. But by then you have probably spun out and mounted the center median, and are facing backwards, with both the clutch pedal and the brake pedal , firmly planted on the floor. Try not to blame it on the tires........
The 275/50 wants a 9" rim to run proper pressure, but those are somewhat hard to find. Second best is an 8.5 . But....IMO 275/50s are too low anyway at 25.8, compared to 275/60s at 28. These tall-boys look better,and are about as tall as you dare put back there, so tuck 'em in.They handle better on 8.5s too. And the 28s will offer better traction than the shorter tires.
If you can't spin 'em, you need more TC, or more gear.....not necessarily more motor.
72 bluNblu..... knows the backspaces
