Power to weight ratio of your car?

[Gamefreak501]

I need to get my Spitfire on a rolling road - the exhaust should be more free flowing and the bigger carbs I have fitted should mean more power as well.

But I would really love to get it to 110+ hp/ton, which will involve extensive engine work as well as megasquirt.

I also wonder how much horsepower my Car would have lost in it's last 31 years!

 

[ScoobyDoo69]

It would take me about 450bhp to break 300bhp/ton - I need more power

 

[Alibaba99]

S1 Elise 111s - 155bhp - 745kg = 208bhp/ton

What has been done to get the weight down by 25kg and the power up?

 

[CaptainRAVE]

SLK 230 - 145 bhp/tonne (I think).

Desperate to get my hands on an SLK350, but the funds aren't available at the moment

 

[Raymond Lin]

Thats actually a really impressive power to weight ratio - how comes its so slow with a power to weight ratio like that? I'd be expecting more than 9 seconds to 60 out of it, thats about what my old Mondeo did it in and that was 110bhp/tonne..

I thought i would give the 0-60 time a go in real life but i found a video on youtube instead.

That looks like somewhere between 7 to 8 seconds?

 

[Vigoro]

If the speedo is accurate that is. Might be a few mph under and with a gear change just after that it could be what is pushing it to 9 seconds

 

[InvaderGIR]

Book figures:

103.65bhp/tonne

142bhp, 1392kg

Mondeo.

Still think this thread is largely pointless being a sticky mind.

 

[Raymond Lin]

If the speedo is accurate that is. Might be a few mph under and with a gear change just after that it could be what is pushing it to 9 seconds

That went straight over my head lol

 

[Vigoro]

Even though the speedo on your car says you are doing 60, it doesn't always mean it is doing 60mph, speedo's have to be accurate to 10% +/- if i remember correctly, and most the time they will over read slightly, so will show a faster speed than what you are traveling. So the 0-60 time would depend on how it was tested, whether it was by a speedo you would have in your car, or a speedo that was calibrated to be spot on

 

[Raymond Lin]

Ah, i get it but i guess we won't know unless I put it on a rolling road?

 

[Vigoro]

Sat nav is normally an accurate way of measuring speed

 

[Vipernet]

Even though the speedo on your car says you are doing 60, it doesn't always mean it is doing 60mph, speedo's have to be accurate to 10% +/- if i remember correctly, and most the time they will over read slightly, so will show a faster speed than what you are traveling. So the 0-60 time would depend on how it was tested, whether it was by a speedo you would have in your car, or a speedo that was calibrated to be spot on

g-meter?

 

[Duke]

Golf GTi MK5 - 148.3bhp/tonne (197/1.328)

Please update following the RR result, 171.6bhp/tonne (228/1.328)

 

[alexisonfire]

My old C2 was only 1-2mph out, even at 100+. Is this the same with all digispeedos?

 

[Cairns78]

330Ci 149bhp/ton
From a rolling road a while ago (result slightly below book) and weighbridge (too many options specced I guess!)
But let's see what the Inspection 2 (due any time) will do with new plugs, filters, oil etc...

 

[spaceman]

mr2 240bhp/ton (307/1.28)

should be around 350bhp/ton when i finally get it mapped.

 

[BigglesPiP]

156 2.5 V6 24V

192 / 1.355 = 142

 

[Minstadave]

Audi A3 2.0T 3 door:

197bhp/1430 kg

138bhp per ton

 

[Eliot]

167bhp and 1215kg so 137bhp/ton!
Berger says ^
However I'm down about 17 kg as I have no spare and some billet steel kicking about.
Call it about 139 a ton.
However by hopefully this time next year I should be about 12 kg down per corner. Due to new brakes and wheels , followed by a further - 25kg from air con and 4 from a flywheel but then 20kg ish will be added mysteriously on and power will be about 400hp.
Or if I go my other route I will have a power of 210 with no extra weight.
So either 400 /1141 = 350
Or 210 / 1121 = 187
306 gti6 btw.