Steve Breen

John have a look at this page for some ratios to add to your database. Anything you come up with gladly received to append to this list...

http://www.iwoc.co.uk/impspec2.html

One thing to bear in mind is the diameter of the wheel/tire combination. The WRX Bugeye has the same gear ratios as the previous Impreza but has a bigger wheel so is effectively higher geared.

Steve


[Edited by Steve Breen - 7/3/2002 5:02:13 PM]

Avi

Just to add a bit of variety.. Your lowly old Sport John.. Now mine

MY98 Impreza Sport, Standard Gearbox.
Max RPM = 6250 ( I Think), can't be arsed going to check because it's chucking it down

Freshly Collected Data

1st gear 5.5MPH/1000rpm Top Speed 34.5MPH
2nd gear 9.5MPH/1000rpm Top Speed 59.5MPH
3rd gear 13MPH/1000rpm Top Speed 81.5MPH
4th gear 17.5MPH/1000rpm Top Speed 109MPH
5th gear 21.5MPH/1000rpm Top Speed 135MPH

Andy

[Edited by Avi - 7/3/2002 6:08:49 PM]

johnfelstead

keep em coming please.

Top speed is theoretical, as you wont pull that without a big power increase. Drag goes up as the square root of speed you see.

your spot on with the sport Andy. I had it on the limiter in 5th at the ring and that was 135MPH.

[Edited by johnfelstead - 7/3/2002 8:18:17 PM]

chrisp

MY00 Ver 6 WRX Type RA (with 7,500 redline)

1st = 5.5mph/1000rpm = 41.25mph max
2nd = 7.75mph/1000rpm = 58.125mph max
3rd = 10mph/1000rpm = 75mph max
4th = 13.3mph/1000rpm = 100mph max
5th = 20mph/1000rpm = 150mph max


cheers

chrisp

[Edited by chrisp - 7/4/2002 9:35:27 AM]

MTR

Hello all,

I have found this web site, which might be of interest for people wondering about how their non standard wheels and tyres may be affecting their gearing.
Page down until you reach the calculater.

http://www.fernblatt.com/longhurst/tyre_bible.html

And this one which shows a list of tyres and the revolutions they would make over a mile.

http://www.kumhomotorsports.com/products/index.htm

As an example a 225/45x17" tyre is shown as having a diameter of 629mm or 24.76" (I calculated my tyre size as 24.97"?) which would have a circumferance of 2.16yds.
That would give 814 revs per mile.
But their stats show that tyre achieving 835 revs per mile giving it a smaller rolling circumferance of 2.107yds.

This equates to an effective rolling diameter of 24.15" some 0.61" SMALLER than the unloaded tyre diameter.

On a STi7 this would mean that the gearing in top with THEIR tyre would be theoretically 24.98mph/1000rpm but in fact would be 24.36mph/1000rpm.
So at 6K you would be doing 146mph not 150mph.

I calculated the diameter of my tyre, I suppose you should really measure them with a vernier caliper or similar, but then perhaps thats getting a little bit silly, even for me.

I have similar charts for Dunlop and Goodyear rally tyres which I have had over 23 years, but the theory is still the same.

Edited to say,
Andy Mc,
Yes if the tyres were running a low enough pressure to increase the deformation, ie allow the wheel rim to sit closer to the road then the rolling radius of the wheel tyre combination must reduce.
By how much you would need to reduce pressure would depend on the rigidty of the sidewall of the tyre.
Many year sago a friend was running a BMW2002i with Goodyear G800 180/330 Ultragrips (forest rally tyres) on. He noticed a funny noise when cornering that went on for weeks.
He eventually realised one of his back tyres was runing with about 10psi in it, and you could hardly see any difference compared to the other side of the car with a correctly inflated tyre.

Cheers MTR


[Edited by MTR - 7/5/2002 11:29:34 PM]

johnfelstead

After the recent debates on the various gear combinations/car types its got me very curious about what people have out there.

What i would like is a simple listing of MPH/1000rpm in each gear as per your speedo listed against the car you drive and if the box has ever been modified/rebuilt. To get this simply get to 4000rpm in each gear and note the speed, divide by 4 and you have MPH/1000rpm. Also then multiply this by your max revs, mine is 8.25 for 8250rpm, to give top speed.

Obviously, if doing this in top takes you over the speed limit, dont go to 4000rpm, drop it to 3000rpm and divide by 3 instead of 4.

Mine is

STi5 Type RA V-Limited, Standard Gearbox.
Max RPM = 8250

1st gear 5MPH/1000rpm Top Speed 41MPH
2nd gear 7.75MPH/1000rpm Top Speed 64MPH
3rd gear 10.25MPH/1000rpm Top Speed 84MPH
4th gear 13.75MPH/1000rpm Top Speed 112MPH
5th gear 22MPH/1000rpm Top Speed 180MPH

Little Miss WRX

Just an added safety note.

GET A PASSENGER TO DO THIS!!! taking your eyes off the road to note this kind of thing, even on a straight piece of road it can be dangerous!!! Who knows what might leap out in front of you.

Safe driving

Carry on.....

ChristianR

iTrader: (1)

<undisclosed> :P

Skippy

John

Here is mine, std Lotus 340R, 7800 rpm max.

1st gear 5.5MPH/1000rpm Top Speed 42.9MPH
2nd gear 9.5MPH/1000rpm Top Speed 74.1MPH
3rd gear 13.4MPH/1000rpm Top Speed 104.52MPH
4th gear 16.9MPH/1000rpm Top Speed 131.82MPH
5th gear 22.9MPH/1000rpm Top Speed 178.62MPH (Not likely )

Figure's from the Lotus Service Manual.

I've seen just over 6k but didn't feel much left, this means 140 ish. Not bad for 1.8 Rover

Skip.

Reffro

Just quickly wheel/tyre size has no effect on the speed shown on the dash. The drive for the speedo is taken from the gearbox and is unaffected by changes in wheel/tyre sizes, so for this test it makes no difference.

johnfelstead

We are not children Michelle, i think we can work that one out for ourselves!

Yep, wheel size/tyre size doesnt matter at all, just tell me what your car is and what you see.

Paul_M

My UK turbo has a higher 5th gear than any of those posted here, less than 3000 RPM at 70 which translates to around 25 MPH /1000 RPM in 5th. Is this because it's a UK model? Makes it great for M-way cruising.

TaviaRS

Gear ratios/mph per 000 for RS as follows:
1st = 3.3/6.2
2nd = 1.94/10.5
3rd = 1.31/15.6
4th = 1.03/19.8
5th = 0.84/24.3

Therefore max speed at 7k is

1st = 43
2nd = 74
3rd = 109
4th = 139
5th = 170.1

Doesn't help much does it John?

CrisPDuk

1st 0mph
2nd 0mph
3rd 0mph
4th 0mph
5th 0mph

93 Legacy Turbo with Donald Ducked Clutch

Little Miss WRX

Just making sure

Robertio

iTrader: (1)

Approx figures (too wet to go out and check, so have to assume the build paperwork is right) for 2l Pinto Westie:

1st gear 5.2MPH/1000rpm Top Speed 32MPH
2nd gear 9.6MPH/1000rpm Top Speed 59MPH
3rd gear 13.8MPH/1000rpm Top Speed 85MPH
4th gear 17.3MPH/1000rpm Top Speed 107MPH
5th gear 20.0MPH/1000rpm Top Speed 124MPH

===============================================

Ibiza Tdi pd 130 Sport (when it turns up) - the only one I know:

6th gear 37.0MPH/1000rpm

CTR

1st gear 4.5mph/1000rpm top speed 36mph
2nd gear 7mph/1000rpm top speed 56mph
3rd gear 9.8mph/1000rpm top speed 78.4mph
4th gear 12.9mph/1000rpm top speed 103.2mph
5th gear 16.1mph/1000rpm top speed 128.8mph
6th gear 20mph/1000rpm top speed 160mph

Those are the figures from the TypeR website, based on the 8000rpm redline. Taking it to the limiter the top speed will be faster in each gear

Allan

iTrader: (1)

Std MY00 UK Scooby Turbo, as original as the day it was built.

1st Gear 6MPH/1000rpm speed 42MPH
2nd gear 10MPH/1000rpm speed 70MPH
3rd Gear 14MPH/1000rpm speed 98MPH
4th Gear 19.3MPH/1000rpm speed 135MPH
5th Gear 25MPH/1000rpm speed 175MPH

Top speeds calculated at 7K, 175MPH surely not
Allan

logiclee

Only know 5th on the Alfa.

20.8mph / 1000rpm.

Rev limiter @ 7250rpm = 150mph

Does feel a bit unrelaxed at motorway speeds when compared to a UK Scoob.

Lee

ian/555

John I got this from the same handbook as the info on the difflock.
I hope you don't mind but I have also added other things that you might want to know about the specs, using and servicing of apart from the 20,000Km servicing you asked about.

type GF-GC8
model WRX STi Version V
5MT
1st gear 3.166
2nd gear 1.882
3rd gear 1.296
4th gear 0.972
5th gear 0.738
rev gear 3.333
final reduction
gear ratio 4.444
Total vehicle weight 1545 kg

model WRX type RA STi Version V
5MT
1st gear 3.083
2nd gear 2.062
3rd gear 1.545
4th gear 1.151
5th gear 0.825
rev gear 3.333
final reduction
gear ratio 4.444
Total vehicle weight 1515KG

model WRX (MY99) version V
5MT
1st gear 3.166
2nd gear 1.882
3rd gear 1.296
4th gear 0.972
5th gear 0.738
rev gear 3.333
final reduction
gear ratio 4.444
Total vehicle weight 1545KG

model WRX type RA (MY99)
5MT
1st gear 3.083
2nd gear 2.062
3rd gear 1.545
4th gear 1.151
5th gear 0.825
rev gear 3.333
final reduction
gear ratio 4.444
Total vehicle weight 1485KG

type GF-GF8

model WRX STi Version V
5MT
1st gear 3.166
2nd gear 1.882
3rd gear 1.296
4th gear 0.972
5th gear 0.738
rev gear 3.333
final reduction
gear ratio 4.444
Total vehicle weight 1585KG

model WRX (MY99)
5MT
1st gear 3.454
2nd gear 2.062
3rd gear 1.448
4th gear 1.088
5th gear 0.825
rev gear 3.333
final reduction
gear ratio 4.111
Total vehicle weight 1575KG

model WRX (MY99)
E-4AT (auto)
1st gear 2.785
2nd gear 1.545
3rd gear 1.000
4th gear 0.694
5th N/A
rev gear 2.272
final reduction
gear ratio 4.111
Total vehicle weight 1606 KG

type GF-GC8

model WRX type R (pure sports coupe) STi Version V
5MT
1st gear 3.083
2nd gear 2.062
3rd gear 1.545
4th gear 1.151
5th gear 0.825
rev gear 3.333
final reduction
gear ratio 4.444
Total vehicle weight 1535KG

As I mentioned before the WRX STi type RA was the only standard production version V Impreza fitted with the quick steering rack being of 13:1 ratio.
No version Ltd's, two or four door, are referred to anywhere in the handbook I have, this is not to say that they did not come as standard/optioned with the quick rack.


Rear differential Oil (4WD)
Feeler plug reading: 0-0.5mm
Oil used:
Other than machine LSD type: Subaru Gear oil 4WD : 75W-90 (GL-5)
Machine LSD type : Subaru gear oil LSD.
oil capacity 0.8L

Transmission Oil capacity 4.0L
Replacement For the RA STi every 40,000 KM For all other vehicles 20,000 KM (this must be a mistake that the RA STi can go 40,000 KM with all others needing it in half the distance)

It mentions again 20K KM

Transmission Oil
"Use Subaru Manual Gear Oil for the transmission. Change the oil every 20,000KM"


It mentions about the waterspray liquid level warning light.
"This light will appear when the water level in the intercooler water spray tank is low. When the light appears the automatic inject function will cease to operate and the manual mode switch must then be used. If you use the manual function more than 10 times the tank will become empty and the pump may be damaged"
Manual mode
"Simply press the manual switch. Upon doing so, the water will spray for approx 5 seconds"
Auto mode
"When switching the AUTO switch ON, at regular intervals, water will be sprayed for a 5 second period. Even if the AUTO mode is selected and you press the manual switch, water will be sprayed at that moment as well"

Fuel consumption 10.0 (10 L per 100KM?)
"Low fuel light will come on when roughly 9 litres of fuel left"
Tyre air pressure's
205/50 R16 Front 2.3 Rear 1.9 spare 4.2 unit: kg f / cm2

It mentions about the front pads thickness being smaller on the STi and STi RA version by 1mm so being 10mm. Also the rear pads are thicker by 2 mm so being 11mm.
Spark plugs NGK PFR6B 0.7-0.8mm gap.

and with that it is time for bed!
ian

chrisp

Just looking at your ratios John taking into account misjudging where the line is on the speedo it looks like 1-4 is the same as yours but you have a slightly higher 5th

Crispin

Top post John

Will note & post mine en route to Cornwall this friday, no passenger, but while i'm looking for my phone charger, and trying to open a sandwich im sure i'll be able to manage this task if I steer with my toes

Dream Weaver

Haven't done a full test, but in 5th gear I get approx the following:

80mph - 3500rpm
100mph - 4500rpm
120mph - 5500rpm
140mph - 6500rpm

Rev limiter at 7200rpm, so roughly 150mph ish

Standard MY94 MR2 2.0 GT NA

DW

TonyBurns

iTrader: (3)

Would have to take the car out for a spin to make sure but its something like this (car is a PPP'd MY00)

1st 37mph
2nd 67mph
3rd 97ish Mph
4th 127ish Mph
5th... off the clock but calculates at around 167ish MPH but didnt dare look down (showing 160@6500rpm)

Tony

SPEN555

Can anyone answer what is required to be changed if at all possible to give an MY00 UK spec Turbo more manic acceleration through changing either gearbox or diffs or do you need to do both?

Not being anyway knowledgeable in these things but I presume that you would end up with better acceleration but a top speed of only 120mph? due only being able to rev to 6,500/7,000rpm.

If it is possible what are the likely costs for RA gearbox and Diffs from say a breakers?

Damian.

chrisp

Dont know whats involved, maybe just a change of gear ratios in the box. Sounds simple but could be expensive breaking open the gearbox. Maybe cheap on labour to buy a 2nd hand box and diff but this could also be expensive as they are thousands new. With my 5th its 20mph /1000 rpm so 6,500 would be 130. You could of course go for like JF's setup manic 1 to 4 and a tall 5th for motorways. Should give you a good kick upto 90-100mph on a private road or German motorway but still give good economy when crusing in 5th. I guess it wont be cheap either way, what you need is a rally prep outfit to give you a quote. What I would suggest is you drive an RA or R before you have the ratios fitted as they dont suit everyone and a few people have gone the opposite way and fitted UK ratios to STIs.

HunterB

Mitsubishi Galant VR-4S:

1st gear 5.4mph/1000rpm, Top Speed 38mph
2nd gear 9.8mph/1000rpm, Top Speed 69mph
3rd gear 14.4mph/1000rpm, Top Speed 101mph
4th gear 20.6mph/1000rpm, Top Speed 144mph
5th gear 28.7mph/1000rpm, Top Speed 201mph

MTR

John,

STI7 Type UK
Running on 225/45x17" wheels and tyres, with 3.9:1 Final drive.
Standard unmodified gearbox and final drives.

gear...ratio....calculated mph/1000rpm.... speed at 7250rpm
1st...3.636.....5.24mph.......................38mp h
2nd...2.375.....8.02mph.......................58mp h
3rd...1.761.....10.82mph......................78mp h
4th...1.346.....14.15mph......................103m ph
5th...0.971.....19.62mph......................142m ph
6th...0.756.....25.19mph......................183m ph

However I shouldn't think it could pull 7250 rpm in 4th 5th or 6th, given that maxinmum power is at 6000rpm, but might in the lower gears.

On the road
1st..21mph.@.4000rpm = 5.25mph/1000rpm
2nd..32mph.@.4000rpm = 8mph/1000rpm
3rd..33mph.@.3000rpm = 11mph/1000rpm
4th..42mph.@.3000rpm = 14mph/1000rpm
5th..58mph.@.3000rpm = 19.3mph/1000rpm
6th..50mph.@.2000rpm = 25mph/1000rpm

So the relationship between the speedo and Tacho seems quite good,
as the calculated and actual figures are very close.

BUT

And I didn't bother bringing this up on the previous thread, as it starts to confuse the issue, and made my calculations on theoretical tyre sizes.

Pretty much any wheel tyre combination, will actaully be running a diameter something approaching 1"-1.2" LESS than the mathmatical calculated figure, at 30mph.
This means the circumferance can be between 3 to 3.8" LESS than you imagine.

This is because the tyre deforms and flattens at the point the tyre touches the ground.

Ergo the joke 'you've got a flat tyre, but don't worry its only flat at the bottom' ha ha.

This equates to approximately 1mph at 30mph.
So even if your gearing and theoretical tyre size works out to 30mph, you will probably be doing 29mph ish.

This is not my theory on tyre diameters, but printed FACT from Dunlop and Goodyear tyre technical info, specifying the revolutions a specific tyre of quoted diameter will do at 30mph.

So a tyre 23.9" specified dia ON A CAR may actually cover the mathmatical calculated distance of a tyre at 22.9" dia for example.

Wether this continues throughout the higher speed ranges I don't know, as possibly the tyre will begin to deform due to centrifugal forces, and 'may'? expand to its theoretical diameter.

So possibly a car calculated to be pulling approximately 25mph/1000rpm in top may only be pulling 24mph/1000rpm.

Or 6mph slower than you calculate at 6000rpm.

150mph becomes 144mph.
Thats assuming the tyres are brand new and have not lost 10mm of diameter (5mm tread loss each side) through normal wear, or it gets even slower.

Hope you don't mind me printing some of this John, I know it wasn't specifically what you were after, but thought it might enlighten any interested parties.

Cheers MTR



[Edited by MTR - 7/4/2002 10:31:14 PM]

johnfelstead

you need to get out more martin!

Thanks for the info.

TonyBurns

iTrader: (3)

I always thought that the diameter of the tyre was without the tread, ie the wall size so with more tread you get more MPH?

Tony
(ps yes it has been one of those nights )