RPM @ 100KPH on 5th

[rthy]

Just got my Clutch changed and the car seems to be doing around 3200rpm @ 100kph on 5th gear when on the freeway, is that normal?
Its a pretty standard Aus GSR but with 185/60r14's on 14x5.5.

Can't remember what it use to do, been driving my 4x4 Mazda B2600 which hardly hits 100kph let alone 90kph....

Found this thread but they seem to have modded gearboxes so not sure if its the same or not.
http://www.4gtuner.com/index.php?/topic/16116-speed-rpm-5th-gear-ratio/page__hl__speed

Cheers

 

[EV0300]

Just got my Clutch changed and the car seems to be doing around 3200rpm @ 100kph on 5th gear when on the freeway, is that normal?
Its a pretty standard Aus GSR but with 185/60r14's on 14x5.5.

Can't remember what it use to do, been driving my 4x4 Mazda B2600 which hardly hits 100kph let alone 90kph....

Found this thread but they seem to have modded gearboxes so not sure if its the same or not.
http://www.4gtuner.com/index.php?/topic/16116-speed-rpm-5th-gear-ratio/page__hl__speed

Cheers

was it less before clutch change? i dont think change of clutch would make a difference, and my evo does about that at 100, they arent built for freeways I think the high rpm is to reduce lag, could be wrong though.

 

[rthy]

yea the clutch shouldn't have changed anything... unless it was slipping?
It's been about a month since I last drove the gsr, so for the life of me I can't remember what it use to sit at.

 

[CLuTZ]

What sized tyres are you running?

 

[Dean]

Its Normal for a gsr box

 

[rthy]

Thanks


Tyres 185/60r14 (195/60r14 std)

 

[CLuTZ]

Thanks


Tyres 185/60r14 (195/60r14 std)

Well that's a 2% difference in rolling diameter, so that could possibly make a difference too.

 

[EVO-00X]

My GSR gearings (front and rear diff 3.545 ratio) rolls at approx 2850rpm at 100kph in the GSR 5th gear.
That's using a GPS to record the speed and an Apexi AVC-R getting feed from the Haltech ECU to record the rpm.
Tyre size 215/40/17.
Trivia: If you used an EVO 5th gearset in a GSR gearbox it would register a little bit less rpm at 100kmh, however would spread the ratio from 4th to 5th further out from eachother.

 

[rthy]

Iv got some spare alloy wheels with 195/55r15's but have been running the 14's for some time now.

I guess its just me.

Thanks for the input guys.

 

[rthy]

Put some spare 195/55r15's on and @100kph now sits very close to 3000rpm

 

[khubner1]

around 3k on a glxi box over here!