I am wanting some info on which engine is best/most cost effective to go for,my new project will be aiming for 500bhp,so which will be the better the 2.5 or a 2.0 closed deck,both will be rebuilt with forged internals etc.

 

i would be interested too, hope get proper replys not snbs

 

or how about a 2.5 cdb with forged internals

 

2.0 for high rev-ability, 2.5 for lazy drive , had both ..now going the 2.35 route

 

I have to admit I prefered the 2ltr at 500bhp more than I do the 2.5ltr at 500bhp

 

hi steve, can you please explain why? i assume you have had both? please note not a dig in anyway, i need info

 

Steve likes the kick in the back from a laggy 2.0L
Where as a 2.5 the power delivery is more widespread. I'll bet that the 2.5 is quicker just that the hit of the power coming in makes a 2.0L seem quicker.

My 2.5 450 bhp was far more driveable than my 360 bhp 2.0L ever was.

As for the 2.5 being lazy at the top end that's rubbish. Mine would hit the 8k rev limiter no problems and peak power wasn't far away from their either.

 

I do like the hit from the 2ltr engine They both make similar power except the 2.5ltr makes more lbs and yes it is a smoother delivery so it doesn't feel as quick

 

i have to agree with daz,i have the 2.5l cdb and the power delivery is instant and i have had mine round over 7k revs plenty of times. i think a lot has to do with turbo choice aswell i have the 321t+ which seems to go with the 2.5l very well.

 

Surely if you're doing the build anyway, go for the 2.5. I'm doing a 2.0 CDB but only because I couldn't afford a 2.5 short block at the time. As they say 'there's no replacement for displacement'.

 

I have a gt35r on mine and I still like the 2ltr block

 

in my opininon a 2.0ltr cos matt an olly clark no there stuuf an thats what they run

 

Last time I was at RCMS there was a 2.1 being built

Shaun

 

thats not the one in the gobstopper though an it runs 850 bhp (with nos i think) an matt still reckons there is a lot left in it

 

Nope.......... AFAIK it was heading for a dark blue mica bugeye

not mine

Shaun

 

For road use you can't beat the 2.5 , the instant torque it delivers just makes driving so pleasurable..

 

what about a 2.1??

 

Thanks for the feedback guys,i was basing the 2.0 or 2.5 on how i will buy my next scoob,it will either be and old RA which allready has the cdb and build from that or try and get old of a later v5/6 type r/ra with a dead engine and replace with the 2.5,but looking at the price of the v5/6 type r/ra's it may be an old ver 1 sti ra,as my budget will only be 10k plus a bit of cash here and there,
Do the cdb's only come in the version 1 sti ra's? what year is this up to?

 

Hi you can get a 2.33 full forged short engine from slowboy racing for about £3800 and a blowen up ra for a couple of grand you will with the right modes turbo injectors ecu ect get a poss 600BHP what do you think of that.john

 

i think you`ll find its the version 1 & 2`s up to 96 that had the cdb

 

also some old wrx's have a cdb i think. I have a 1992 scoob and than has all the telltale signs of a cdb although i haven't removed the heads yet

 

You can buy CDB's for reasonable money (£300 ish). I was fortunate mine cost me £50

 

i no were there is a clean p1 with full ssh totally standard for 6k but it has done 128,000 but if your gonna drop another lump in then it dont matter