6th gear RPM's on the highway...

[diesomber]

Well... I've had my GT-S for less than a week and I DIG IT! ... I drive from Boston to NY every couple of weeks and this weekend was my first long highway drive... what a blast! My question is: what knid of RPM's is everyone pulling at 80 MPH? I was spinning about 3650 in 6th at 80 MPH with a full trunk, girlfriend, and dog... is this about right? seems a tad high to me... I thought 6th would be like an OD gear and drop the RPM's for good gas mileage on the highway... Thanks for the info everyone!

[h1coupe]

i have a gt 6speed and i get 2600 at 100km/h(62mph)

[Johan]

That's a 6 speed GTE I guess ?

Mine does 2200 at 62 MPH.

I have a tuned GTE

[diesomber]

Thanks for the replies... I'll check out what RPM's I'm at at 62 MPH to compare... I just noticed that anything over 70 seemed high in 6th... like I said, I just assumed 6th was OverDrive gear for fuel economy...

[Johan]

6 speed manual transmission gear ratios:

1st 3.166
2nd 2.050
3rd 1.481
4th 1.166
5th 0.916
6th 0.725

reverse 3.250

So, 6th gear is not an overdrive...............

On the other hand. They used the term overdrive for a gear ratio below 1.000, so in fact 5th AND 6th gear on the Celica's are overdrives...............

[RGM]

For your info, a 5 speed GT spins 3000 rpm for 102 km/h or 60 mph in 5th.

[4CyLSiLvACeLi]

with all that in your car that sounds about right.

[uansari]

Ok, so I'm the only one answering this guys question that has a USDM Celica GT-S with 6 speed...

At 80mph, I'm usually around that RPM as well... no problems there...

Usman

[97gpGT]

Originally posted by Johan
[B
So, 6th gear is not an overdrive...............

On the other hand. They used the term overdrive for a gear ratio below 1.000, so in fact 5th AND 6th gear on the Celica's are overdrives............... [/B]

What else is considered an overdrive? I'm curious, because I've never heard another definition for o/d other than "a gear ratio less than 1.000:1.000". BTW- In 4th gear in my car at 70mph I'm spinning at ~2000 rpm. Just an interesting comparison to the GT-S 6speeds, I think. You guys think you have long gearing.... :)

[teletubbies]

I just drove like 105mph on I-94 yesterday with my 2003 GT Auto
my RPM is about 3700, I am sure it is between 3500-4000

how come the rpm is so high on the 6-speed?
I will check again later on today when I drive back

[Johan]

Okay, I made a testrun in 6 th gear. Here are the numbers :

2500 rpm = 100 kmh = 62.5 mph
3000 rpm = 120 kmh = 75.0 mph
3500 rpm = 140 kmp = 87.5 mph
4000 rpm = 160 kmp = 100.0 mph
4500 rpm = 180 kmp = 112.5 mph
5000 rpm = 200 kmp = 125.0 mph
5500 rpm = 220 kmp = 137.5 mph
6000 rpm = 240 kmp = 150.0 mph
6500 rpm = ?
6800 rpm = ?

[brolly33]

Interesting Johan,

Perhaps the Euro-spec Celis are geared a bit differently?

I just made a run across Alligator alley in FL and did a long stretch at 90 mph in 6th and was squarely on 4000 RPM.

100 mph was closer to 4300 range for me.

80 mph is right in the 3700 range.

I have seen posts regarding the innacuracies of speedos in other threads. Maybe that is where the variation is coming in. Tire size should make no difference in the gauge numbers unless the rolling diameter was different form the factory (different speedo gearing) as the speedo reading comes from further up the drive train.

[2002GT_Celica]

Originally posted by diesomber
Well... I've had my GT-S for less than a week and I DIG IT! ... I drive from Boston to NY every couple of weeks and this weekend was my first long highway drive... what a blast! My question is: what knid of RPM's is everyone pulling at 80 MPH? I was spinning about 3650 in 6th at 80 MPH with a full trunk, girlfriend, and dog... is this about right? seems a tad high to me... I thought 6th would be like an OD gear and drop the RPM's for good gas mileage on the highway... Thanks for the info everyone!

It's right, and driving at 3650 is going to give you good gas mileage.

[Johan]

The rims and tires can not make a difference because my car (in the winter) is on her stock rims and tires.

Might be the fact that my car is tuned to 166 hp ..........

[brolly33]

HP, tires, rims, passengers, dog, shoesize... none will have any impact on the gauge readings of MPH/RPM.

Things that will impact the gauge readings:
gearing, speedo gearing.

The key here is that you are using the gauges to do your readings. The Tach (RMP) reading is coming directly from your ECU and only reflects how many times your crank rotates in a minute. The Speedo (MPH) is pulling the speed of the shaft after the transmission but before the tires. The only things that can impact this ratio are inside the tranny.

Of course, your actual MPH (if you used a radar gun for instance) will change compared to your RPM if you change the rolling diameter of your tires.

Your HP will impact how fast you can get to any given RPM and if you can hit redline in your highest gear or not (impacting top speed in our cars)

It has to be either different gearing (final drive ratio), different speedo gear, or innacuracies in the Speedo.

Looks like you are right on the money, diesomber.

[BB_GT01]

I have a 5-speed GT, but noticed the high RPM cruise, also. You will find that it is much less noticeable after the engine is broken in. The RPM's won't change, of course, but it seems like the engine is just more comfortable cruising at 70-75, after a few thousand miles.
That's just the way these cars are geared. Toyota wanted to maximize the acceleration and gave some up on "economy".

[teletubbies]

i just checked with my 03 GT Auto....
80mph 3000rpm
90mph 3400rpm
100mph 3800rpm

[white2003gts]

im at like 4000 at 85 or so in 6th i believe!!

[2k2blkgts]

Originally posted by teletubbies
i just checked with my 03 GT Auto....
80mph 3000rpm
90mph 3400rpm
100mph 3800rpm

I though that manuel saves more gas than auto if driven properly. it seems that this auto is saving major gas @ 80mph. my manuel shows 80mph at 3600-3700 rpm.

[teletubbies]

Originally posted by 2k2blkgts


I though that manuel saves more gas than auto if driven properly. it seems that this auto is saving major gas @ 80mph. my manuel shows 80mph at 3600-3700 rpm.

that's what I thought too at the beginning....but not...my car is 29/36 at first i thought that RPM should be lower than mine in 6th gear....

[4CyLSiLvACeLi]

Originally posted by Johan
Okay, I made a testrun in 6 th gear. Here are the numbers :

2500 rpm = 100 kmh = 62.5 mph
3000 rpm = 120 kmh = 75.0 mph
3500 rpm = 140 kmp = 87.5 mph
4000 rpm = 160 kmp = 100.0 mph
4500 rpm = 180 kmp = 112.5 mph
5000 rpm = 200 kmp = 125.0 mph
5500 rpm = 220 kmp = 137.5 mph
6000 rpm = 240 kmp = 150.0 mph
6500 rpm = ?
6800 rpm = ?

you hit 150 and act like it's nothing... :ugh: i was psyched to hit 121 before i had to slow down in my gt auto... damn you GT-S owners :(

[Vroom_Vroom]

3,000RPM exactly at 80mph, in my auto gt :)

[h1coupe]

Originally posted by 4CyLSiLvACeLi


you hit 150 and act like it's nothing... :ugh: i was psyched to hit 121 before i had to slow down in my gt auto... damn you GT-S owners :(
he is not a GT-S owner he has a european GT(like mine:))and his car has a intake and chip=166hp!

[Johan]

Originally posted by brolly33
HP, tires, rims, passengers, dog, shoesize... none will have any impact on the gauge readings of MPH/RPM.

Things that will impact the gauge readings:
gearing, speedo gearing.

The key here is that you are using the gauges to do your readings. The Tach (RMP) reading is coming directly from your ECU and only reflects how many times your crank rotates in a minute. The Speedo (MPH) is pulling the speed of the shaft after the transmission but before the tires. The only things that can impact this ratio are inside the tranny.

Of course, your actual MPH (if you used a radar gun for instance) will change compared to your RPM if you change the rolling diameter of your tires.

Your HP will impact how fast you can get to any given RPM and if you can hit redline in your highest gear or not (impacting top speed in our cars)

It has to be either different gearing (final drive ratio), different speedo gear, or innacuracies in the Speedo.

Looks like you are right on the money, diesomber.


So, if I understand you correct, the air resistance and tire resistance also has nothing to do with the speed/rpm ratio ???

(don't think so)

And Yes, I have a European GT, tuned up to 166 hp..........

[97gpGT]

The air and tire resistances have to do with the load that you put on your engine, not on the rpm that the engine is spinning at. So, if your car has greater air and tire resistances than another person's car with the same gearing, you'll both be spinning at the same rpm at, say, 80mph but you'll be burning through more fuel to keep it there. Hope that helped....

[brolly33]

Exactly 97gpGT,

Johan, I did not say speed/RPM... I said speedometer reading/RPM. The reading from the gauges don't necessarily reflect how fast you are really going. I am assuming you are getting the readings off your chart from the gauges and not a radar gun.

You could put a 1000hp motor in your Celica, 30" tires inflated to 180 psi, a ton of S-Type stickers and enough neon to put a strip club to shame. As long as you do not change the speedometer, gearbox or the little plastic speedometer gear, your speedo would still read 90 MPH when your Tach read 4000 RPM in 6th gear.

IE in 6th gear the output shaft of the engine (crank shaft) spins once and the output shaft of the tranny will spin 1.39 (approx). The speedometer measures the how fast the output shaft of the tranny is rotating, not how fast the car is going.

Now you also must realize that the 30" tires will change your rolling diameter and thus your actual speed would be much higher than 90 MPH. In order to fix that, you would have to replace the speedo gear to compensate.

In thinking deeper, a slipping cluch will also change that ratio of RMP/MPH as you will rev higher for the same MPH with a slipping clutch. But the clutch is in-between the RPM sensor at the crank and MPH at the end of the tranny. An automatic tranny will also give a more variable ratio.

So, anyone know for sure if the Euro spec GT-S 6 speed has a different gearbox or final drive ratio? Or can we chalk this up to slipping clutch or speedometer innacuracies?

**edit** or did you have 15" rims from the factory Johan? they mihg thave a different rolling size and thus the factory would have put a different speedo gear in to compensate.

[Johan]

Originally posted by brolly33

So, anyone know for sure if the Euro spec GT-S 6 speed has a different gearbox or final drive ratio? Or can we chalk this up to slipping clutch or speedometer innacuracies?

**edit** or did you have 15" rims from the factory Johan? they mihg thave a different rolling size and thus the factory would have put a different speedo gear in to compensate.


6 speed manual transmission gear ratios:

1st 3.166
2nd 2.050
3rd 1.481
4th 1.166
5th 0.916
6th 0.725

reverse 3.250


The european Celica comes with 16" rims and 205/50/16 tires.....

[Acilec]

Johan, check your PM's :)

[Johan]

I did. Thanks, didn't expect is soo soon.................... :D :D :D

[Acilec]

bwahahahaaaa, sorry man.

[rob2zz]

Are the gears different on the european models because in my GT-s I was running just over 6000 rpm at about 142?

[rob2zz]

that is 142 mph I forgot the mph

[Speck102]

My Accord used to be around the same RPM on the freeway in fourth as my GT-S is in 6th. The celica has short gears. And the extra RPM at freeway speeds is beneficial to gas mileage.

[97gpGT]

Originally posted by Speck102
And the extra RPM at freeway speeds is beneficial to gas mileage.

The lower the RPMs, the better your gas mileage as long as the load on the engine is the same.... The way I read this, you're saying the opposite is true.

[Speck102]

That would only be true on a perfectly level freeway with no wind or anything. Anything higher than that would be extra, but for the Celica I noticed it reacts alot better at these RPM for regular daily driving, and when it doesn't have enough power, it eats extra gas.