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  #16  
Old 03-03-2005, 09:10 PM
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svxfiles svxfiles is offline
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Quote:
Originally posted by CigarJohnny
Wow! That's not bad at all. Very liveable if you ask me. THat would put your theoretical top speed at over 170mph. Does not seem right as that is slightly less than a stock SVX, no?
Johnny
A 4.44 equipped automatic transmission SVX has a theoretical top speed 25% less than a stock one with a final drive ratio in third gear of 3.545 to one.
Our redline is 7000 rpm, so to simplify lets say you are pulling 6940 rpm in overdrive.
Since the car, whether 3.545 or 4.44, has an overdrive ratio of 1 to 0.694, this gives a driveshaft speed of 10,000 rpm.
If you have the stock gears,3.545 to 1, then your axle spins at 2820.8744 rpm.
This coupled with a 24.86" tall tire gives a speed of 208.62695 mph.
Yes, I know the car does not have enough power to go that speed, but that is the math.
With the 4.44s, the same 6940 rpm get's 166.57265 mph.
Still enough to get ticketed in any state.

So, by my own math this says that if I had stock tires, at 3000 rpm I'm actually going 72. 54 mph?

I'm tired now, I'll check this tomorrow.
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The first SuperCharged SVX,
the first 4.44 gears,
the first equal length headers,
the first phenolic spacers,
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Last edited by svxfiles; 03-03-2005 at 09:19 PM.
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  #17  
Old 03-03-2005, 10:00 PM
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n00b on demand n00b on demand is offline
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Quote:
Originally posted by svxfiles
Because it takes more time than I have available .
Gotcha Tom....are you gonna be racing ur car at the meet on the 13th?
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  #18  
Old 03-03-2005, 10:52 PM
OrthopodSvx
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Well Johnny I can see that your RPM question has been answered, but since I actually remembered to look at the gauges on the way home I feel compelled to post my results.

75mph= slightly under the 3000

80mph= slightly over 3000

Stock wheels and tire sizes.

These findings seem to be congruent with svxfiles's. When I had my gps hooked up my speedo was always a few mph ahead of the gps's indicated speed. Therefore I do not doubt the numbers svxfiles calculated at all. Calculators don’t lie, Speedometers do.

Did I mention that I love the way this thing drives now?

Last edited by OrthopodSvx; 03-03-2005 at 11:04 PM.
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  #19  
Old 03-04-2005, 05:01 AM
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I'm thinking that I'm gonna have to find a trans (when it is time to replace) that has a taller overdrive than what I have currently. The current trans is definitely designed for a car capable of pushing only 140 at best. Our cars can do at least 160 if geared properly and I hate the fact that I am limited to "only" 140. I also hate the fact that I am turning close to 4000rpm at 80mph.

Johnny
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Mods: 5-speed, 4.11's, Group-N motor mounts, dual Magnaflows, cone air filter, Kenwood MP-228 CD/Receiver, white-faced gauges, '97 grill, custom window tinting.

Ebony Mica '92 LS 80K Oct 2002 - Dec 2004: Victim of theft. She served me well.

You can tell the lack of craftsmanship by the wrinkles in the duct tape.
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  #20  
Old 03-04-2005, 07:49 AM
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svxfiles svxfiles is offline
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OK, I'm awake now. If we were running at 3250 rpm, on the run I spoke of, then the actual vehicle speed, (in referance to the axle rotation,) is 78.00585 mph.
Orthopod, speedometers do lie, but if mine only lies 5 mph at 80, that's not too bad. I was running 225/45/17s that day, and most days when there is no snow. So if you factor the tires, AaHA! 78.351008 mph! well, that explaines it then!

Orthopod, how do you like the way it drives, now?


93, I have some tuning to do. and i'm under a little pressure to get things done . It sounds like a super meet and I'm charged up for it

Johnny, 7000 rpm,0.78 overdrive, 4.11 to one rears,=2183.5423 axle rpm, gives 161.49098 theoretical mph.
So. 4000 rpm should be 92.2804 mph.

Johnny, if your engine were actually turning 3750 rpm, ( you did say close to 4000 rpm) that would put your speed at 86.512875, so IF your spedometer read 5 mph low, like mine reads 5 mph high.....
Can you run a few miles down the highway at 60 mph, or 75 mph, with a stopwatch and see if your speedometer is incorrect?
__________________
www.svxfiles.com
The first SuperCharged SVX,
the first 4.44 gears,
the first equal length headers,
the first phenolic spacers,
the first Class Glass fiberglass hood,
the first with 4, 4.44s in his driveway


Fiberglass Hood thread
My locker
4.44 Swap link

Last edited by svxfiles; 03-04-2005 at 08:02 AM.
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  #21  
Old 03-04-2005, 09:00 AM
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CigarJohnny CigarJohnny is offline
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Quote:
Originally posted by svxfiles

Johnny, 7000 rpm,0.78 overdrive, 4.11 to one rears,=2183.5423 axle rpm, gives 161.49098 theoretical mph.
So. 4000 rpm should be 92.2804 mph.

Johnny, if your engine were actually turning 3750 rpm, ( you did say close to 4000 rpm) that would put your speed at 86.512875, so IF your spedometer read 5 mph low, like mine reads 5 mph high.....
Can you run a few miles down the highway at 60 mph, or 75 mph, with a stopwatch and see if your speedometer is incorrect?
Now that's more like it! Right on target with where I wanted to be in the first place. I will definitely have to clock it against the mile markers to get a true speedo error result. I am used to the speedo's reading higher than actual. This lower than actual could be quite dangerous to my license. Thank you so much for your calculations, bud! Now to fix my massive exaust leaks that have developed this week, get it inspected, and replace the clutch in time for the meet and I will be readdy to let others enjoy the 5-speed experience in Reading.

Johnny
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Pearl '92 LS-L 179K (Historic 1st 5-speed SVX)
Mods: 5-speed, 4.11's, Group-N motor mounts, dual Magnaflows, cone air filter, Kenwood MP-228 CD/Receiver, white-faced gauges, '97 grill, custom window tinting.

Ebony Mica '92 LS 80K Oct 2002 - Dec 2004: Victim of theft. She served me well.

You can tell the lack of craftsmanship by the wrinkles in the duct tape.
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