Healthy torque curve?

[Cider Andy]

My car was on the rollers yesterday morning and produced this:



Is it healthy enough for a standard 450?

[V8 Archie]

The shape looks about normal, but it doesn't go very high. I'd say you're OK at the edges but I get to about 270lbft @ c 3950rpm. I believe that is fairly normal.

[bigdods]

Depends on the rolling road (lets not open THAT can of worms!)

Curves look ok, my 450 pushes 260 to 275lb and 231 to 260 BHP at the fly - depending on which road its tested on !

[V8 Archie]

bigdods said:

Depends on the rolling road (lets not open THAT can of worms!)

Br! I put that into my first reply - forgot it after the edit.

[DaveAVT]

Maybe his rolling road was slightly uphill...

[Llanelli-Rob]

DaveAVT said:

Maybe his rolling road was slightly uphill...

Handbrake on?

[DaveAVT]

Llanelli-Rob said:

DaveAVT said: Maybe his rolling road was slightly uphill... Handbrake on?

nah, there was roadworks too...

[Llanelli-Rob]

DaveAVT said:

Llanelli-Rob said: DaveAVT said: Maybe his rolling road was slightly uphill... Handbrake on? nah, there was roadworks too...

Maybe the big cooling fan infront of the car was holding it back?

[DaveAVT]

Maybe the 235 horses were actually 3 legged donkeys?...

[DaveAVT]

lol, what actually is horsepower?

Shire horse, versus My Little Pony....

I can't work it out..

[IM]

I don't understand, why are you slaughtering this guy?

He only asked a question.

>> Edited by IM on Tuesday 23 May 20:44

[tahiti450]

Cider Andy said:

My car was on the rollers yesterday morning and produced this: Is it healthy enough for a standard 450?

From what I've picked up that looks very healthy for a standard 450, I assume that the graph show estimated flywheel BHP / torque (otherwise it would be extraordinary!!).

I would be pretty satisfied with that in terms of a health check.

[e2djh]

Had my 450 done recently at Surrey Rolling road.
The car is "factory standard" and produced 264 bhp 280 ft/lb at the fly, and 209 / 220 at the fly.

Charlie felt this was fine for a standard 450.

[Llanelli-Rob]

IM said:

I don't understand, why are you slaughtering this guy? He only asked a question. >> Edited by IM on Tuesday 23 May 20:44

Hardly slaughtering,harmless fun,looks fine to me.

[bigdods]

e2djh said:

Had my 450 done recently at Surrey Rolling road. The car is "factory standard" and produced 264 bhp 280 ft/lb at the fly, and 209 / 220 at the fly. Charlie felt this was fine for a standard 450.

ALmost identical to mine, good to see a direct comaprison. On Surrey RR mine gave up 259bhp and 275lb which I was chuffed with :-)

[e2djh]

bigdods said:

ALmost identical to mine, good to see a direct comaprison. On Surrey RR mine gave up 259bhp and 275lb which I was chuffed with :-)

And you also have one of the fast (Blue) ones

[theaxe]

dyno said:

Kimera

[Cider Andy]

The car went in for diagnosis of a misfire at low revs, but because of a misunderstanding just went on the rollers as it is. It's going back for investigation next week.

Looking back at other figures posted here for both 4.5l and 4.0l, I thought that although the figures were acceptable they appeared slightly low, although I was more interested in the shape of the curves than the actual figures, hence the question.

As far as that particular dyno is concerned, the only reference point I have is against a 4-litre Chimaera (200BHP/220lb.ft.) and a 5.0l Griffith (260BHP/280lb.ft.), as published in Sprint from July last year. Both cars were standard.

I have a suspicion about wear in the camshaft: would it show up in this graph?

[jonnyb]

Cider Andy said:

I have a suspicion about wear in the camshaft: would it show up in this graph?

Yes, in the torque curve. But that looks about right for a 4.5. Although I'm no expert, try showing it to Joolz, he tends to know what to look for.

[Cider Andy]

Cheers for the replies, guys and a special thanks to DVT Dave or whatever he's called, who presumably is as helpful with his customers.