F7P or F7R turbo

[energy_god]

wich on is better for 1/8 mile drag race?

What about F7P with 84mm pistons???
Is it better than F7R with 82.7 pistons?

no as it leaves the head gasket to weak when overboring to 84mm.

[MAXIBOY]

mapped correctly i will doubt there will be much if any difference.

but 1.8 is cheaper and you can use 2.0 litre megane 8v pistons to keep the cost down.

[Rory]

mapped correctly i will doubt there will be much if any difference.

but 1.8 is cheaper and you can use 2.0 litre megane 8v pistons to keep the cost down.

i didnt know that, what would the compresion ratio be using them and would i need one of the expensive thicker head gaskets from BB tunning?

[arj256]

Didnt BB tuning always seem to get more bhp out of the f7p on there turbo conversions than the f7r?
Seem to remember observing that somewhere.
Id go for a f7p if i was turbo'ing personally.

[MAXIBOY]

mapped correctly i will doubt there will be much if any difference.

but 1.8 is cheaper and you can use 2.0 litre megane 8v pistons to keep the cost down.

i didnt know that, what would the compresion ratio be using them and would i need one of the expensive thicker head gaskets from BB tunning?

compression would be 7.5 to 1. could run a standard gasket. pistons are 40 quid each new.

[MAXIBOY]

Didnt BB tuning always seem to get more bhp out of the f7p on there turbo conversions than the f7r?
Seem to remember observing that somewhere.
Id go for a f7p if i was turbo'ing personally.

yes but as far as i,m aware that was due to different mapping...

though the 1.8 was tuned to 320bhp.... and might get even more very soon..

[geznay]

mapped correctly i will doubt there will be much if any difference.

but 1.8 is cheaper and you can use 2.0 litre megane 8v pistons to keep the cost down.

i didnt know that, what would the compresion ratio be using them and would i need one of the expensive thicker head gaskets from BB tunning?

compression would be 7.5 to 1. could run a standard gasket. pistons are 40 quid each new.

i thought that for the high boost conversion u needed the compression to be 8.5 to 1?

[Justin..]

depends how high you want to boost.

[geznay]

well how wouldnt want to put too much seeing as std h/g and std megane pistons (not forged) what would be the lowest and highest boost u could run with them?

[Justin..]

well there is no lowest as you could run 1 psi it would just be shit but highest ? dunno 10 psi maybe 12? as a rule you cant run more than 7 psi on a stadard compression n/a bottom end