Speed/Revs...400SE ?

[grahamw48]

Does anyone have the speed/revs in top for a 'standard' 400SE please ?
I'm still waiting for a part for the speedo, so it would help to know how much over the limit I am.

[adam quantrill]

The 400SX does 170mph at 6000 rpm in 5th, if that helps. I think the diff is standard.

[grahamw48]

Thanks Adam, I'll work back from that....don't think I've had 6,000 in 5th yet...at least not in town.

[blaineuk]

think that if you are in 4th gear the rev counter almost mirrors the speedo, will give you a rough idea of speed.

[grahamw48]

Are you trying to get me into trouble Blaine ?

- 1st gear maybe...think about it.

[pwd95]

My old 400 used to be...4th--20 mph/1000, so 5k in 4th was 100.

5th--about 25 mph/1000, so 4000 rpm was 100mph

The Griff is about the same but gets there a lot quicker........

[JR]

adam quantrill said:

The 400SX does 170mph at 6000 rpm in 5th, if that helps. I think the diff is standard.

That's a tall diff; it sounds like the same one that I had in my 350i: 28mph/1000rpm in top or 168mph at 6000 revs (in theory,) 140mph at 5000revs is nice for cruising.

[TVRleigh_BBWR]

pwd95 said:

My old 400 used to be...4th--20 mph/1000, so 5k in 4th was 100.

5th--about 25 mph/1000, so 4000 rpm was 100mph

The Griff is about the same but gets there a lot quicker........

Sounds about the same as mine.

[adam quantrill]

JR said:

adam quantrill said:

The 400SX does 170mph at 6000 rpm in 5th, if that helps. I think the diff is standard.

That's a tall diff; it sounds like the same one that I had in my 350i: 28mph/1000rpm in top or 168mph at 6000 revs (in theory,) 140mph at 5000revs is nice for cruising.

You might be right - the 350i is nearer 25mph/1000 in 5th. What's going to be the easiest way to tell for the 400SE then - borrow a GPS or use mile markers on a motorway to calibrate it.

[red tasmin]

Mine must be geared all wrong!! as does 4000 revs in 5th at 80mph, although revs to 7000 odd when pushed. Maybe my tacho is running fast!

[GV]

adam quantrill said:

The 400SX does 170mph at 6000 rpm in 5th, if that helps. I think the diff is standard.

Ahem...170mph? This is speedo talk right and not actual road speed???

[adam quantrill]

Last time I checked the speedo against a GPS it was pretty much spot on - up to my GPS limit - and indeed the tacho is linear with the speedo too.

So make your own mind up ;^)

Still - it would need 98RON or better fuel, a nice cold day, top up driving, a recent service, no clutch slippage (should be OK for that now).....

[grahamw48]

Didn't it give the figures in the 280/350 handbook ? (the one I gave away ).

I reckon it's going to be more like 28 per 1,000 in top.

Maybe someone can see how many revs their 400 is doing at 60mph in top.

Meanwhile I'll do a bit of surfing research...blimey - something useful for a change.

[JR]

grahamw48 said:

I reckon it's going to be more like 28 per 1,000 in top.

Not for the standard one that you thought that you had. 25mph/1000 is standard, see above; if you have the taller diff it's 28/1000 or maybe 28.3 according to adam, either way not a lot in it. Of course this is TVR so you may have none of the above :-)

[jvaughan]

3000rpm @ 80mph in the Wedge
4000rpm @ 110 - 115mph
5000rpm @ 140 - 145mph
5250rpm @ 155 mph

according to the last dyno

[JR]

jvaughan said:

3000rpm @ 80mph in the Wedge
4000rpm @ 110 - 115mph
5000rpm @ 140 - 145mph
5250rpm @ 155 mph

according to the last dyno

Something is badly wrong there!

[TVRleigh_BBWR]

Mine speedo was spot on with the GPS also, it's a bit jumpy below 10mph though.

Also some people have said that the rev counter's can miss read though.

Also 25 MPH per 1000 RPM seems about right AFAICR

[grahamw48]

Thanks guys.
I've a new speedo cable fitted, but just waiting for the little gearbox cog, which has worn, so not doing anything.

I'll play safe and work on 25mph/1000 in top.