Engine behaviour. 8.2:1 CR vs 7.3:1 and 7.7:1

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Skalabala

Member +
Hi members.

I was wondering how the 4EFTE reacts to these CRs?

Standard will be 8.2:1+- and if you use -10cc wiseco/whatever piston then you will be
at around 7.3:1 to 7.7:1 depending on head chamber cc.

The lower CR will give you a better knock threshold but do you need a better knock threshold on a 4EFTE?

Is the car sluggish of boost with a CR of 7.3:1?

Detailed pros and cons please :)
 
ChrisStarletGT

ChrisStarletGT

Member +
I hav dished pistons and 2mm head gasket and it slow as fuck when just settin of from lights then when turbo kicks in u shit yaself coz it pull like a jet fighter
 
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AdamB

Member +
Car will be super sluggish with a CR of 7.3:1, it all depends on the fuel your using as well. I think for most peoples use around stock maybe a little lower is perfect.
 
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AdamB

Member +
Skalabala said:
Jet fighter... atom bomb...
Hahahahahahaha! You guys know how to entertain :D
95 BP with CR of 7.7:1?
Click to expand...

Depends on what boost, management and power your going for.
Spuddy still runs around the stock compression ratio at 500bhp, although he's on meth.
 
goldenvtr

goldenvtr

Member +
mine is around 7.5.1 but its 5e, i dont have any issues with off boost driving, but i do have alot of torque and pretty responsive boost at low rpm
 
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Skalabala

Member +
250-300hp might be less due to 6000ft altitude :(
stand alone with a good tune, 1.8bar or there about but not with pump gas
daily drive 1bar pump gas
 
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Skalabala

Member +
Will 7.3:1 be the lowest practical CR?
For normal urban driving also.
And what will be the +- effect of turbo spoolup time? 7.3:1 and 8.2:1 with a CT9 and TD04?
 
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