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Safe cruising RPM?
Major Stare - 8/9/09 at 06:19 AM

Have a bit of a drive this evening (2003 R1).

What kind of RPM do you guys travel on motorways at?

Davey D - 8/9/09 at 06:20 AM

with my 2006 5VY engine and 3.38 diff, im doing around 6800rpm at 70mph

iiyama - 8/9/09 at 06:21 AM

80mph = 6k RPM.............: 3.38 diff being driven by a Hayabusa on 225/50/15 tyres.



[Edited on 8/9/09 by iiyama]

tomgregory2000 - 8/9/09 at 07:08 AM

3200rpm at 70mph but i have a propper engine fitted in my car

dinosaurjuice - 8/9/09 at 07:13 AM

quote:
Originally posted by tomgregory2000
3200rpm at 70mph but i have a propper engine fitted in my car


3200??? thats a bit high

2000rpm at 72mph

aka Keith - 8/9/09 at 07:56 AM

I tend to sit at around the 8-9000....

In all seriousness, I tend to sit between 7500-9000 (zx9r with 3.62 diff) and sometimes I sit and think "what the fck must this be doing to the egine - I wonder if Mr Kawasaki envisged his bikes sitting at the equivilent of 150 for an hour at a time)..

and then the though passes....

[Edited on 8/9/09 by aka Keith]

[Edited on 8/9/09 by aka Keith]

nick205 - 8/9/09 at 08:10 AM

quote:
Originally posted by dinosaurjuice
quote:
Originally posted by tomgregory2000
3200rpm at 70mph but i have a propper engine fitted in my car


3200??? thats a bit high

2000rpm at 72mph



now that's just plain lazy

smart51 - 8/9/09 at 08:20 AM

The doge viper I worked on did 50 MPH per 1000 RPM in top. 70 MPH = 1400 RPM.

adithorp - 8/9/09 at 11:14 AM

Just in case we get back to usefull posts...

My '06 5VY with Freelander diff runs about 6400 at 70mph in 6th

The engine is happy to run at those revs (and more) for hours.

adrian

ps...13500 in 1st also gives 70mph!

Davey D - 8/9/09 at 03:33 PM

quote:
Originally posted by adithorp
Just in case we get back to usefull posts...

My '06 5VY with Freelander diff runs about 6400 at 70mph in 6th

The engine is happy to run at those revs (and more) for hours.

adrian

ps...13500 in 1st also gives 70mph!


Has your chassis been designed to take a freelander diff from the start, have you modified it to take the freelander diff, or have you got an adapter bracket that lets you bolt a freelander diff into the space there a ford diff would mount?

i quite fancy getting a new freelander diff, and im sure once upon a time i found somewhere that sold brackets that lets you bolt a freelander diff into where a ford diff would go, but now that im actually trying to find one, i cant seem to find who sold them

dan__wright - 8/9/09 at 03:54 PM

mines currently about 9K @ 70mph lol ive got a 3.14 to go in though.

asn163 - 8/9/09 at 06:14 PM

Hi Jon,

I get about 10mph per 1000rpm in top gear in my Indyblade. That's with a 3.62 diff. and 15" wheels.

Simon

spdpug98 - 8/9/09 at 07:59 PM

Been out in mine tonight the first time with a working rev counter, at 70mph the engine is @ 6100rpm with a 3.38 diff

Major Stare - 9/9/09 at 06:46 AM

Cheers guys, chucked it down last night, so im out this afternoon.

I have no idea what ratio my diff is?!?

Its on 14" rims with 185x60's.

If i remember correctly, it does about 6700rpm at 70mph, although my speedo is out

ReMan - 9/9/09 at 07:01 AM

quote:
Originally posted by asn163
Hi Jon,

I get about 10mph per 1000rpm in top gear in my Indyblade. That's with a 3.62 diff. and 15" wheels.

Simon

Ditto exactly 1000 per10 mph same set up
If you don't like the noise you may have the wrong engine not the wrong diff

adithorp - 9/9/09 at 03:32 PM

quote:
Originally posted by Davey D
quote:
Originally posted by adithorp
Just in case we get back to usefull posts...

My '06 5VY with Freelander diff runs about 6400 at 70mph in 6th

The engine is happy to run at those revs (and more) for hours.

adrian

ps...13500 in 1st also gives 70mph!


Has your chassis been designed to take a freelander diff from the start, have you modified it to take the freelander diff, or have you got an adapter bracket that lets you bolt a freelander diff into the space there a ford diff would mount?

i quite fancy getting a new freelander diff, and im sure once upon a time i found somewhere that sold brackets that lets you bolt a freelander diff into where a ford diff would go, but now that im actually trying to find one, i cant seem to find who sold them


The chassis was built to take it as thats what I planned to use. Shouldn't be hard to make up mountings though as there's just 2 tapped holes at the back by each drive shaft (only mounted using one each side) and 2 by the nose. So mines on 4 bolts.

With the 5VY it does give a very long first, and a high top. Both of which have thier good and bad points. Bit high off the line but no changes to 70. Top is nice on the M'way but in a 7 you'd need to be going down hill with a following wind to get to the limiter; Not got thier in the Fury yet but it's still pulling like a train at approching 140!

adrian

bj928 - 24/10/09 at 09:27 PM

quote:
Originally posted by smart51
The doge viper I worked on did 50 MPH per 1000 RPM in top. 70 MPH = 1400 RPM.


my viper v10 powered 7 is geared to do 71 @ 1300 rpm in 6th, it'll do 61 in 1st @ 6000 rpm

andrew.carwithen - 25/10/09 at 10:12 AM

quote:
Originally posted by ReMan
quote:
Originally posted by asn163
Hi Jon,

I get about 10mph per 1000rpm in top gear in my Indyblade. That's with a 3.62 diff. and 15" wheels.

Simon

Ditto exactly 1000 per10 mph same set up
If you don't like the noise you may have the wrong engine not the wrong diff


Thirded here.
My 893cc blade, 3.62 LSD and 15" wheels gives 10 MPH per 1K revs in top gear (i.e 70mph = 7000 rpm)
Drove from Plymouth to Stoneleigh last May (some 200+ miles with no trouble at all - though I do have a Polo rad which keeps running temps nice and cool.)

Major Stare - 25/10/09 at 07:38 PM

At about 7000rpm,, is that a "safe" cruisng rpm????

andrew.carwithen - 25/10/09 at 08:43 PM

quote:
Originally posted by Major Stare
At about 7000rpm,, is that a "safe" cruisng rpm????


Don't see why not.
After all, its only approx 2/3 of max rpm (equating to something like 4000 rpm in your average family saloon - which I know is above the usual 3k but certainly won't cause any engine damage.)
Anyway, how often are you going to be driving on motorways? (not really the most fulfilling domain for this type of car.)

ed1801 - 26/10/09 at 10:30 AM

On my 600cc bike, I will cruise at anything between 6k (70mph) and 8.5k (on the autobahn at ~100) for hundreds of miles. That is about 2/3rd the max rpm of 12.5k. I'm sure it will be fine.

Brommers - 26/10/09 at 04:42 PM

quote:
Originally posted by Major Stare
At about 7000rpm,, is that a "safe" cruisng rpm????


Sure. Due to the way its geared (and my, ahem, cruising speed) my Striker generally cruises at between 9k and 10krpm. The engines don't seem to mind at all. The gearboxes (it's got a ZX9R in it) seem to be made of chocolate, but that's another story...

motorcycle_mayhem - 28/10/09 at 10:50 AM

The car goes on a trailer for motorways.

However, I don't believe holding a bike engine at speed is a detriment to it. Compared to the abuse I give the engine on the track, looks a bit tame. I would imagine that heat is your main concern and it's dissipation at continued high RPM.

BTW I'm normally 10-11mph/1K revs.
205/60/13 road, 8.2/22-13 slick.

My bike (GSXR1000) is normally held around 8-9K on motorways, but depends on risk-of-enforcement levels.

Major Stare - 28/10/09 at 05:02 PM

quote:
Originally posted by motorcycle_mayhem
...but depends on risk-of-enforcement levels.


Nicely put

motorcycle_mayhem - 29/10/09 at 10:13 PM

It's a sad truth, crimes you and I find disgusting (and no I won't list mention them), or stuffing your fat face into the trough of 'expenses'... wait, I'll just apologise....

Get caught a few mph over the limit on an empty road on a **motorcycle** and get severly penalised for self endangerment. Thank Gordon, Brown's here to protect me.

Sick of it.

matt_gsxr - 31/10/09 at 11:26 PM

Approx 6k at 70mph.

GSXR1100wp, 3.14 diff, 13inch wheels

In my experience the engine likes it (runs much nicer afterwards) I guess it cleans the plugs up. I have only done about 50miles at a stretch though.

Matt