whats all this about, surely a bit of bs!!!

[james walker]

http://cgi.ebay.co.uk/SEAT-LEON-CUP...ryZ72205QQssPageNameZWDVWQQrdZ1QQcmdZViewItem


saw this whilst trawling through fleabay.

surely this is a con, upto 20bhp?

now im not an expert but this aint right, right?

 

[Barker1977]

Technically they are probably right, the more weight you can save the faster the car will go. But when dealing with a heavy road car and not a lightweight Formula one car the difference os so negligible that it isn`t worth it.

Something like that is only worth it if you have exhausted all other performance avenues and are just after tiny improvements over big gains already found.

 

[Ninja]

10-20bhp from removing 10-14 pounds of weight ?? err how exactly ??

 

[Seat til I die]

i saw this a while back...
how much bhp do you think it really does increase a 225 by then??

 

[Stu_pot]

This does actually work but not for the figures they are quoting.

General rule of thumb is around 3% gain, you would get a similar gain by removing rotational drag such as the aircon/alternator drive belt.

 

[truCido]

*cough*

The lower weight yields a large reduction in the rotating inertia of the belt train, allowing the engine to accelerate faster. The effect is similar to fitting a lightened flywheel and is particularly noticeable in the lower RPM range before the turbo spools up.

 

[Seat til I die]

This does actually work but not for the figures they are quoting.

General rule of thumb is around 3% gain, you would get a similar gain by removing rotational drag such as the aircon/alternator drive belt.

3%, so still getting on 10bhp then in a tuned lcr...

 

[daveyonthemove]

How much do my back seats weigh? if i remove them i should get some BHP too!








Sorry, but without hard evidence i think thats complete arse.

 

[Stu_pot]

'General' rule of thumb... I would say in this instance it would be more like 3-4 bhp on a 1.8T.

 

[Scotty_b]

Nuespeed do these so i presume they will have all the info on there site?

 

[Stu_pot]

How much do my back seats weigh? if i remove them i should get some BHP too!








Sorry, but without hard evidence i think thats complete arse.

Where is your hard evidence to disprove it?

If you remove weight such as your seats, you won't increase your BHP, but you WILL improve your power to weight ratio, I.E Power LOSSES.

By stripping rotational losses, especially from the crank you are decreasing the power losses.

This is why people quote "at the flywheel figures" and "at the wheels or wheel horsepower" because there are losses incurred all the way from the flywheel through to the wheel.

 

[Romeoisgraham]

I saw these too, the cost for fitting at a garage wouldnt be worth the trouble.

 

[daveyonthemove]

Where is your hard evidence to disprove it?

If you remove weight such as your seats, you won't increase your BHP, but you WILL improve your power to weight ratio, I.E Power LOSSES.

By stripping rotational losses, especially from the crank you are decreasing the power losses.

This is why people quote "at the flywheel figures" and "at the wheels or wheel horsepower" because there are losses incurred all the way from the flywheel through to the wheel.

That was my point! Reducing weight won't give you more BHP, it will just give the engine an easier time moving the car as its lighter.

 

[RobDon]

I tried the Neuspeed pulley set ... made no difference whatsoever, zero bhp gains, dyno tested before and after at Star.

 

[Mitchy]

All your doing is utilising the power you've already got more efficiently.

For example.....

270bhp has a value of 240whp after transmission losses.

Lighten the inertia of some components..

270bhp now has a value of 245whp.

So yes you can gain power but whp, not bhp

 

[ChrisUK]

Get rid of Daveyonthemove from your passenger seat & gain an extra 50bhp

Only joking mate

 

[daveyonthemove]

cheeky sod!

 

[andycupra]

i can see why it would increase bhp, but realistically only to a very small amount.

The main difference id have thought would be an improvement in responsiveness, however this is also dependant and the flywheel so again the gains would be small.