SOTP feel slower after Gear Install?

svogt · Jun 10, 2005

Hey all,
I had the gears in my car changed from 3.23 to 3.73 in a 2000 Gt.

Q1.For some reason the car does not feel as quick or smooth when I accelerate. It feels as if the engine is straining harder to do some of the same stuff. I also though it would be real easy to light them up and it seems that this is untrue. I am unsure of what to expect? I thought the gears would give the car more tourque and acceleration. I know I will lose out top end but the I thought the SOTP feeling would be great?

Q2. How far off will the speedo be now? I had somone pace me and they said they were doing 55 while mine read 60. we did this through different MPH it varied at certain points but seemed to maintain a constant 5-6 MPH off.
I thought the gear change would be more drastic(ie i would feel it faster). Is there a way to check the ratio by turning the wheels or something?

The car has the following:

70MM TB
Accufab Plenum
CAI
This weekend
Long tubes
BBK X pipe w/Cats
Flows American thunder cat back
Steeda Pulleys

Next summer CAMs (comp# 262ah)

What HP could I expect? (without cams) Should I get a Chip/Diablo Tuner
Are they worth the money?

any help

timeless2 · Jun 10, 2005

"4.10s" is the proverbial answer to this issue.

2001sleeper · Jun 10, 2005

it should be more than 5-6mph off.

4point6GT · Jun 10, 2005

thats weird, maybe they put old 3.08's in there but the gears and programmer were my most noticeable mods it wass night and day, and i think my speedo was 10-12 off depending on speed...

Newbie143 · Jun 10, 2005

svogt said:
Hey all,
I had the gears in my car changed from 3.23 to 3.73 in a 2000 Gt.

Q1.For some reason the car does not feel as quick or smooth when I accelerate. It feels as if the engine is straining harder to do some of the same stuff. I also though it would be real easy to light them up and it seems that this is untrue. I am unsure of what to expect? I thought the gears would give the car more tourque and acceleration. I know I will lose out top end but the I thought the SOTP feeling would be great?

Q2. How far off will the speedo be now? I had somone pace me and they said they were doing 55 while mine read 60. we did this through different MPH it varied at certain points but seemed to maintain a constant 5-6 MPH off.
I thought the gear change would be more drastic(ie i would feel it faster). Is there a way to check the ratio by turning the wheels or something?
any help

this might be a bit silly , but what does SOTP mean ? is it Step on the peddal!?

timeless2 · Jun 10, 2005

seat of the panties

Ghostface · Jun 10, 2005

gears should be one of the most SOTP mods you can do.

MT1083 · Jun 10, 2005

Are you sure that they put the right gears in?

Kilgore Trout · Jun 10, 2005

Who did the install? You or a shop?

pdl2flr · Jun 10, 2005

I am sure someone knows exactly, but I think there is test you can do like turning the tire one full rotation and counting how many times the driveshaft rotates. It is something like that.

Give Me TP · Jun 10, 2005

svogt said:
Hey all,
I had the gears in my car changed from 3.23 to 3.73 in a 2000 Gt.

Q2. How far off will the speedo be now? I had somone pace me and they said they were doing 55 while mine read 60. we did this through different MPH it varied at certain points but seemed to maintain a constant 5-6 MPH off.

any help

That's about right, if they were going 55 mph and their speedometer is correct, you should be showing just under 63 mph if you changed to 3.73s from stock 3.27s (not 3.23s).

Yes you can determine the gear ratio by jacking up a rear wheel and counting the approximate number of revolutions by the drive shaft per complete rotation of the rear wheel, then comparing that to known Ford gear ratios (2.73, 3.08, 3.27, 3.55, 3.73, 3.90, 4.10, etc.).

A flash tuner would be a good idea, both for HP and to correct your speedo for the gear change.

my_03GT · Jun 10, 2005

I believe when I went to 3;73's my spedo was off 7 MPH, I would show 62 while actually doing 55.

BlackenedSVT · Jun 10, 2005

svogt said:
Hey all,
I had the gears in my car changed from 3.23 to 3.73 in a 2000 Gt.

Q1.For some reason the car does not feel as quick or smooth when I accelerate. It feels as if the engine is straining harder to do some of the same stuff. I also though it would be real easy to light them up and it seems that this is untrue. I am unsure of what to expect? I thought the gears would give the car more tourque and acceleration. I know I will lose out top end but the I thought the SOTP feeling would be great?

Q2. How far off will the speedo be now? I had somone pace me and they said they were doing 55 while mine read 60. we did this through different MPH it varied at certain points but seemed to maintain a constant 5-6 MPH off.
I thought the gear change would be more drastic(ie i would feel it faster). Is there a way to check the ratio by turning the wheels or something?

The car has the following:

70MM TB
Accufab Plenum
CAI
This weekend
Long tubes
BBK X pipe w/Cats
Flows American thunder cat back
Steeda Pulleys

Next summer CAMs (comp# 262ah)

What HP could I expect? (without cams) Should I get a Chip/Diablo Tuner
Are they worth the money?

any help

Is your car an automatic? I'd imagine it must be. My 98GT had 4.10 gears and it honestly didn't feel different AT ALL to me when I drove it. The only time I would notice the change is when I would launch off the line, and be able to gain ground on some cars easier.

Mr GT 02 · Jun 10, 2005

here. this calculator will show what your RPMS should be at while at a certain speed in a certain gear...or your MPH in a certain RPM in a certain Gear.
This helps with most questions..

www.tchracing.com/tech/gearcalc

SilverGTV8 · Jun 10, 2005

TO the one who asked what SOTP means

It means Seat Of The Pants.

trinity_gt · Jun 10, 2005

my_03GT said:
I believe when I went to 3;73's my spedo was off 7 MPH, I would show 62 while actually doing 55.

That's about right. 3.73s are a 14% shorter gear than 3.27s. Therefore, one could expect the indicated MPH to be about 14% higher than the actual. 7/55=12.7%, close enough to 14%... Given those numbers svogt supplied, he's probably got the 3.73 cogs in there too.

There's no question that "even just" 3.73s (as opposed to 4.10s or 4.30s that others recommend) should supply a better punch in the back. Assuming 1st gear and 300 peak crank ft-lbs, 3.27s would give 3316 ft-lbs at the hubs. 3.73s would give 3782. From an instantaneous torque perspective, this would be the equivalent of leaving the 3.27s on and bolting a mod onto your engine that gave 42 ft-lbs more torque at the peak (i.e. 342 ft-lbs versus 300.)

You'd definitely feel that.

Is it possible the guy doing the job did it poorly? For instance, were the brakes re-assembled properly and aren't dragging? How easily does the car roll in neutral?

MGSTANG · Jun 10, 2005

My 3.73's felt a major first gear difference until I put the Mac Prochamber on and lost low end TQ. But now that I have the SCT X-cal 2 dyno tune, the car feels like that's back.

02LaserRed2V · Jun 10, 2005

UDTBadkarma said:
Is your car an automatic? I'd imagine it must be. My 98GT had 4.10 gears and it honestly didn't feel different AT ALL to me when I drove it. The only time I would notice the change is when I would launch off the line, and be able to gain ground on some cars easier.

Same here. The most noticeable difference (as far as improved acceleration) for me was that my car pulled harder on OD (4th).

00s281sc368 · Jun 11, 2005

Newbie143 said:
this might be a bit silly , but what does SOTP mean ? is it Step on the peddal!?

"this might be a bit silly " yes it is ...

wms004 · Jun 11, 2005

svogt said:
Hey all,
I had the gears in my car changed from 3.23 to 3.73 in a 2000 Gt.

Q1.For some reason the car does not feel as quick or smooth when I accelerate. It feels as if the engine is straining harder to do some of the same stuff. I also though it would be real easy to light them up and it seems that this is untrue. I am unsure of what to expect? I thought the gears would give the car more tourque and acceleration. I know I will lose out top end but the I thought the SOTP feeling would be great?

Q2. How far off will the speedo be now? I had somone pace me and they said they were doing 55 while mine read 60. we did this through different MPH it varied at certain points but seemed to maintain a constant 5-6 MPH off.
I thought the gear change would be more drastic(ie i would feel it faster). Is there a way to check the ratio by turning the wheels or something?

The car has the following:

70MM TB
Accufab Plenum
CAI
This weekend
Long tubes
BBK X pipe w/Cats
Flows American thunder cat back
Steeda Pulleys

Next summer CAMs (comp# 262ah)

What HP could I expect? (without cams) Should I get a Chip/Diablo Tuner
Are they worth the money?

any help

I think you need to recalibrate your butt dyno

-wade

SOTP feel slower after Gear Install?

svogt

Member

timeless2

Vi Veri Veni Versum Vicus Vici

2001sleeper

New Member

4point6GT

New Member

Newbie143

New Member

timeless2

Vi Veri Veni Versum Vicus Vici

Ghostface

Member

MT1083

New Member

Kilgore Trout

Fried or Broiled ?

pdl2flr

New Member

Give Me TP

Member

my_03GT

New Member

BlackenedSVT

Active Member

Mr GT 02

New Member

SilverGTV8

New Member

trinity_gt

MGSTANG

02LaserRed2V

New Member

00s281sc368

New Member

wms004

Similar threads

SOTP feel slower after Gear Install?

Member

Vi Veri Veni Versum Vicus Vici

New Member

New Member

New Member

Vi Veri Veni Versum Vicus Vici

Member

New Member

Fried or Broiled ?

New Member

Member

New Member

Active Member

New Member

New Member

New Member

New Member

Similar threads

Privacy & Transparency

Privacy & Transparency