373's and et's

cronin49 · Sep 6, 2004

Hey all, I just read in MM&FF that when you step up from the stock 327's to 373's you will shave off 2 to 3 tenths in the 1/4 mile. They say this is equal to about 40 HP. We all know that changing gear ratio does not increase HP, this is due more to torque multiplication. It makes sense to me, because the 2 people I know who installed superchargers gained around 110 - 120 HP, and dropped about 1 second, maybe a little more from their et's., going from 14.00 to 12.8 - 13.00. What do you all think about this bit of information?

WRXracer · Sep 6, 2004

I ran a 13.7 with only 373 gears on my 02 GT..

cronin49 · Sep 6, 2004

WRXracer said:
I ran a 13.7 with only 373 gears on my 02 GT..

So what do you run now that you have the blower?

WRXracer · Sep 6, 2004

my best was a 12.5 at 112 with drag tires..

tangerine · Sep 6, 2004

I went from 14.2 to a 14.8. It slowed me down and my friend has a 02 gt with 4.10 and he went from a 13.9 to a 14.2. I like them but I think the only way that they can shave some time is with drag tires.

1low03gt · Sep 6, 2004

More gear equal's less traction .Wich is the reason that some run even worse then they did with stock gears.Stickier tires will deffinatly help once you up grade gears .But if you lower the air pressure in the stock tires a bit,and a little clutch play,you can run some good times.
I ran 14.1's @ 101mph with stock 3.27',and with the 3.73's i ran 13.7 @ 103mph,on stock goodyears.

perf_alley · Sep 6, 2004

i just got 410s in my 03 and i get walked by my buddys 99 stang all the time it sucks

cronin49 · Sep 6, 2004

WRXracer said:
I ran a 13.7 with only 373 gears on my 02 GT..

Thats what I just said. A stock Mustang with a good driver will run 14.0. 373's being equal to 40 hp so there is your 3 tenths, your 13.7. Geez!

cronin49 · Sep 6, 2004

1low03gt said:
More gear equal's less traction .Wich is the reason that some run even worse then they did with stock gears.Stickier tires will deffinatly help once you up grade gears .But if you lower the air pressure in the stock tires a bit,and a little clutch play,you can run some good times.
I ran 14.1's @ 101mph with stock 3.27',and with the 3.73's i ran 13.7 @ 103mph,on stock goodyears.

Great! You shaved 4 tenths off with the 373's! This only reinforces what my original post said, and then some. MM&FF is pretty much straight on almost all the time with their info.

MyEarsHurt · Sep 6, 2004

So can you expect similar results with 4.10's? How much difference are we talking in terms of e.t. difference between the 3.73s and the 4.10's. More than 1 tenth? More than 2 tenths? Or hardly anything?

To original poster, what month MMFF was that? Recent?

WRXracer · Sep 6, 2004

one problem I have with change to 373s or 410s is that you trap in 4th.. and on stock gears you trap in 3rd.. this is why im keeping my stock gears in my auto..

cronin49 · Sep 6, 2004

MyEarsHurt said:
So can you expect similar results with 4.10's? How much difference are we talking in terms of e.t. difference between the 3.73s and the 4.10's. More than 1 tenth? More than 2 tenths? Or hardly anything?

To original poster, what month MMFF was that? Recent?

The newest one, Oct. 2004. In a letter that starts on page 42 and ends on page 44. Its in the " Ask Bernie, Yo ken! section.

cronin49 · Sep 7, 2004

MyEarsHurt said:
So can you expect similar results with 4.10's? How much difference are we talking in terms of e.t. difference between the 3.73s and the 4.10's. More than 1 tenth? More than 2 tenths? Or hardly anything?

To original poster, what month MMFF was that? Recent?

I did a little math, and I come up with a drop of 1 to 1.5 sec. going from 373's to 410's. Traction my negate this gain though, as Launching with 410's is more difficult then with 373's, at least on stock tires, Plus you got to shift into 4th at about 86 mph with 410's, I think this is too slow. At least with 373's, you can get up to about 95 mph or so before banging 4th and trap out at about 103mph. Everything else being stock.

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