My little hot rod is a Belvedere II with the side trim removed. The Satellite was a higher trim package on the Belvedere. It became a separate model in '68.
My hood scoop is incorrect for the car. The '65 used a big "hemi" hood scoop that was open all the way across. This one is a Max Wedge style scoop used in '63 and '64.

I converted this car to a 4 speed 6 years ago. I swapped it back to an automatic when I moved the engine back and down for better weight distribution. Moving the 4 speed would have been a major pain and it was far more difficult to drive with enthusiasm. If you tried to bang from 3rd to 4th under load it would top out the rear shocks and unload the tires. It lead to sideways excursions in excess of 80 mph. The rear suspension is great for a launch but tough for a 4 speed at speed.
The auto is much easier to live with and is being replaced with a 518 overdrive unit in the near future.

 

I agree changing your tires or lowering your gear ratio would help your et but it would also lower your mph not raise it. As I see it I think it must be a misprint or an error on the timing. 12.98 is possible but 113 mph in stock trim seems way to high. It takes an approximate 10 hp to gain 1 mph or lose 1 tenth so 5 mph is a bit much thats like 50 hp.

 

yeah next time i go to the track i was thinking about switching the front wheels with the rear because they are smaller. but i could also get less traction because there not as wide. but that's why i got the car is to beat on it, so only one why to find out if it will make a difference.

 

I don't think the rear wheels will fit on the front so you may have to find someone else that would let you try it out. I would get a pair of drag radials or slicks if you really want to beat on it. Put them on another set of cheap steel rims, and you'll be ready in no time.

 

I feel like I'm, whipping a dead horse here, but I don't understand why you feel the smaller diameter tire would give you a quicker et. but a slower over all speed. As long as the SRT goes thru the traps well before its reaches its red line, then the engine is still going to be pulling, and pulling stronger than it would with the larger diameter tires.
The smaller tires will only lower the cars eventual top speed, which of course isn't attainable in a 1/4 mile anyway.
I've been making the suggestion to use the front tires on the rear ever since March, and no one ever responds to my remarks. I also mentioned it would be better if you borrowed somebody else's front tires, (preferably) a Pilot for better traction. The 1" or so of less tread width you would lose by doing so will probably be most noticeable on an SRT. That's why I suggested someone try it on a Limited automatic first. That way you could get the most consistent runs to compare your finding. I would do it myself, but I have I have a 6 spd. and I don't have anybody to loan me their front tires.

 

Cars that drag race do not use overdrive as you need torque to get a good et and using overdrive would reduce your torque. A crossfire manual car would only use the first 5 gears and the auto would only use the first 4 gears. And to get your best time you want to reach your max power or redline just after the 1/4 mile. Drag racing is all about the combination of torque and horsepower. Horsepower affects your mph or trap speed, while torque affects your et. That is why drag racers look at trap speed to see if they made more horsepower, as the trap speed will be almost the same weather you smoke up your tires and get a slow et or get a good holeshot and get a low et. So changing your gear ratio by having smaller tires will help your et by giving you more torque but your horsepower always stays the same and will not raise your trap speed, but usually lower it slightly. If your trap speed goes up you made more horsepower and you can not make more horsepower by putting on smaller tires. As I said before I agree that the et of 12.98 is possible but not the 113 mph that is too high, as I have not seen many mph over 108. He must be making more horsepower or the 113 is a misprint or his car is a factory freak

try this link and put in 3,440 for the cars weight, my best estimate for the car and a 200 lb driver. Use the et method and trap speed method and it will give you respective hp numbers.
http://www.dragsource.com/index.php?...s&calctoview=4
try this one too.
http://www.dragsource.com/index.php?...s&calctoview=5

 

Bengel, Thanks for the "heads up" on the web site. I found it very interesting.
Just for the heck of it I punched in my AMX at 3,400 lbs with me in it, and I figured 230 hp. It came back with 14.296 ET at 95.345 mph. So far my best times have been, 14.291 at 97.205 mph.
My question is how did they know what gear ratio I was running?

 

the calculator is set up for a near perfect run under near perfect conditions, as well as optimum gear ratio. Gear ratio is not all that important in drag racing as long as your not running a 2.73. alot of guys still run powerglides with only two gears and the most common is about a 4.11 rear gives you a great et but you might run out of rpm if you can't rev your engine that high.

 

Bengel, I can honestly say, I have never heard anybody ever say "gear ratio" is not all that important in drag racing. Personally, I can't think of anything else as important except for tires, in determining how a "stock" car performs in the quarter mile.
I don't know what crowd you hang with, but everybody I know would say, "Yeah, he has a gear" if we were talking about somebody who had a car with 4:11s.
All I can tell you, is I cut 4/10ths off my cars original et. simply by going from a 3:15 gear to 3:54s, and if memory serves, my speed increased also.
I firmly believe that our rather "high" gear ratio is the major reason most every other competing sports car (Z's, RX 8, Boxter to name a few) can beat a Limited XF in a drag race.
It doesn't matter if you're running a Powerglide, C6, C4, 727, or a turbohydro, or whatever, we are talking about differential gears, and the tranny is irrelevant in this conversation.
(I do believe the biggest reason for using a Powerglide is to keep from wasting time shifting more than once, but torque manipulation may come into play here also.)
To get back to the original subject of this thread, I don't believe putting a smaller diameter tire on a car (such as a Super Charged XF) is going to cause it to actually have a slower velocity in the 1/4 mile as long as you haven't reached red line. And I don't believe an SRT with its 3:07 rear end, would ever be in danger of running out of RPM in the 1/4 mile by using only its non-overdrive gears. (As long as the tire isn't any smaller in diameter than what's currently used on the front)
It's been my experience in the few, turbocharged, and supercharged cars that I have ridden in, that it feels as though the car just keeps pulling stronger to red line than a normally aspirated car feels. Maybe that's why I don't feel an SRT would be susceptible to that "running out of steam" scenario that you are describing.

 

I am still concerned about the 113 mph that is what has got me thinking as mph hardly changes unless you make more horses. You can make all the gear changes you want but your trap speed will be almost always the same.
I do drag race and I said Gear ratio is not all that important in drag racing as long as your not running a 2.73 Gear ratio or torque is important as it gets you out of the hole and rolling then horsepower must take over and get you to the end. Your trap speed remains almost constant when you change gear ratios you just change your et from the torque multiplication or removal. The reason for the low gear in dragracing is because we all run big tires height and width for traction hence we need a low gear. A small tire is poor for traction and height is better than width everyone knows that and is why when you put on a larger tire you need to change your gear to compensate.
The reason you see two cars with the same et but different mph at the track is because the one with the higher mph makes more horsepower but just can not put it down to the track, if he did his et would be lower.
In the same respect that if you smoke your tires on the start from too much power or if you don't and get a great start your et may vary as much as 1 sec but your mph will be almost the same.
So look at your trap speed and you can then see what your car is capable in the et department. 113 mph on a srt6 means that if you can get it to hook up would be about 12.2 not a stock car in my opinion 108 mph would net about a 12.9 which sound more realistic.

Check this out he explains it better: http://www.turbobricks.com/resources...uartermiledyno

Another example of gearing and mph: http://www.dragtimes.com/forums/index.php?showtopic=60


The start of the track is a big player in the ET, but a small player in the mph. The end of the track is a big player in the mph, but a small player the ET. This is true and why gear ratio changes make little effect on mph but make big changes on et.

 

Hey guys, I don't know squat about drag racing, but I do know something about the physics of traction and wheel / tire sizes.

Putting the front tires on the rear of this car to drag is really silly...

 

I agree slicks would be much better. I just can't figure out the 113 mph, it seems so high compared to everyone else.

 

Derek, of all people, I would think you would understand. It's just to attain a LOWER gear ratio.
I don't doubt for one second, that you know more about physics than I do in relation to traction, and tire size. But I don't believe a STOCK, Limited, automatic Crossfire has so much power that it couldn't drag race using the front tires, on the rear, and not benefit by turning a faster ET. An SRT may very well be another matter.
The subject of installing a lower gear ratio in this car has been talked about at length, many times before on this forum. Using a smaller diameter rear tire to attain this, is just a means to an end, in the least costly manner.
If I had an automatic, and could buy a 3:55 ring and pinion, and have it installed for under $1,500, I would probably do it in a heart beat. A 3:73 would be even better.
But since I have a 6 spd, (with it's ridiculously short 1st gear ratio) installing a lower gear in the differential would render 1st gear useless.
I took my car to the drags last spring just to get a base line to go by, but got rained out before I had a chance to go down the track. I haven't made it back since. But I feel an automatic would be a much better tool to use, simply because "driver ability" would be taken out of the equation, since no two people can shift a manual the same way (especially in a Crossfire).
I really wish somebody would at least try out my theory. I honestly feel it would cut a Crossfires ET by as much as 2 tenths of second, as long as they know how to "launch" the car.
I know it doesn't sound like much, but for absolutely no cost (other than sweat equity) it would be worth it, just to say your "stock" automatic Crossfire runs in the 14's (since according to the magazines, they don't).
The whole thing is just an experiment, of course "slicks" would be better, but that's not the point.
As for Icons 113 mph 1/4 mile speed, maybe it's his "red mirrors", don't they add MPH on the high end?

 

I agree and have siad that lowering your gear ratio will help lower your et. But it will not help raise your mph. To do that you will need more power.

 

I was specifically responding to the title of the post "WENT TO THE TRACK TODAY WITH THE SRT6".

As stated before, putting the front tires on the rear for drag racing is plain silly !!!

 

If you guys are so concerned about the smaller tire look at the track times for a SLK 32 which had smaller diameter tires. Yeah it had an advantage of about 19 hp and 22 torque but the times of that car are comparable with what some on here have gotten 107 or 108 mph in the low 13's and that is with a smaller diameter tire 17" and width 225 front and 245 rear and more hp and torque.

Here's a link to some SLK 32 times from MBWORLD.ORG - http://forums.mbworld.org/forums/sho...threadid=36250

 

Slicks will help your ET allot if you need traction like the srt6 does but it will not affect your MPH or trap speed much. That is just a fact.

Eracer76 even made some examples.

The high MPH usually comes from lack of traction at the starting line.
Most cars I've seen run, including my previous SRT-4 had higher mph when the 60 ft wasn't good.
Whenever I did get it to hook up better at the line, the mph went down and so did the 1/4 time.

An example...
My modded SRT-4 ran 12.7 @ 118 mph w/bad 2.2 60 ft times on street tires,
with practice I got it to run 12.5 @ 116 mph w/ 2.0 60 ft times.
My buddies 71' Roadrunner runs 12.2 @ 110 mph w/1.7 60 ft times on drag radials.

So my question is for ichon how did you get the 113 MPH, that is just too fast for a stock car.