What needs to be changed for 400 BHP and Why?

[virdi]

Hi all,

Taking a 1.8T to 400BHP - I understand that the rods and Valves need to be uprated.

....but what exactly is the reason?

Are Supertech exhaust valves needed because the standard one's cannot take the heat?

....and has anyone actually taken the standard rods to High 300's? Are they def' a weak point?


Thanks

 

[ibizacupra]

yes and yes
400bhp is higher rpm's and higher heat

std valves can and do fail, risking more ££ in damage than their cost. its building in a higher margin of safety

you can risk not doing it of course, but it is risk

 

[virdi]

Thank Bill.

What about Pistons? and compression Ratio?

Are the standard pistons strong enough for 400? and do you have to play with the compression ratio or not?

Thanks

 

[ibizacupra]

Thank Bill.

What about Pistons? and compression Ratio?

Are the standard pistons strong enough for 400? and do you have to play with the compression ratio or not?

Thanks

S3 pistons are adequate yes. Mahl pistons. std compression is also fine

 

[virdi]

Anything else that needs to be changed? or uprated Bill?

Thanks

 

[tashacupra]

S3 pistons are adequate yes. Mahl pistons. std compression is also fine

What's the limit of stock ibiza pistons (AYP) Bill in your opinion?

 

[ibizacupra]

high 300's on ibiza ones should be ok