Help with new motor build?

[filthyrich]

Hi guys

I have a V1 WRX.

So far it has an Sti Close Ratio gearbox in it, and a few bolt ons.

I recently wrecked V3 STI, and pulled the motor from that.

The plan was to rebuild the STi motor with aftermarket pistons and rings etc.

My friend has just offered me a 2.5 block....

Anyway, what would be a good way to go?

So far I have at my disposal:

V1 WRX motor

V3 STi motor

V7 WRX heads

TD05 Turbo

TD05-25G turbo

565cc injectors

Z32 AFM

Completely remappable 4plug ECU

I would like to keep it 4 plug - I guess that means I should use V1 sensors / loom etc

I\'d like to build something reliable, fun, and able to pull a mean heli

Eventually the car will get a 6 speed box

I have a reasonable budget....

Any suggestions?

[hijacka]

300-030 Darton sleeve the closed deck ej20

Bore it out to 100mm

Used the v3 sti heads

Get a set of je 291060 pistons etc

Remember Your now married to your car, like married with children, \'\'you can\'t have 1 without the other\'\'

Add 12mm oil pump, i beams, cosworth headgasket and bearings, apr headstuds..........

[Stoffa]

2.5 with v3 sti heads and 25G is my vote

[filthyrich]

I like the thought of the 2.5 as well....

Why the V3 heads over the V7\'s?

What pistons and rods do I want?

[rex-leggy]

i vote 2.35 .

im going to be selling a shortblock in the not to distant future

[filthyrich]

 rex-leggy said:

i vote 2.35 .

im going to be selling a shortblock in the not to distant future

Whys that?

[rex-leggy]

 filthyrich']

[quote name='rex-leggy said:

i vote 2.35 .

im going to be selling a shortblock in the not to distant future

/quote]

Whys that?

building another to push harder

bigger rods and some sleeves really

[filthyrich]

 rex-leggy']

[quote name='rex-leggy said:

i vote 2.35 .

im going to be selling a shortblock in the not to distant future

/quote]

Whys that?

building another to push harder

No I meant why the 2.35 over the 2.5?

[rex-leggy]

 filthyrich']

i vote 2.35 .

im going to be selling a shortblock in the not to distant future

Whys that?

building another to push harder

No I meant why the 2.35 over the 2.5?

just as responsive . somthing different ...... 2.5 are all over the show now.

was just an idea

[quote name='B-MAGIC said:

EZ30 single turbo, 6 speed.

now that\'ll take alot of $$$

there was a eg33 turbo at the last sprint we went to

[hijacka]

 rex-leggy']

[quote name='rex-leggy said:

i vote 2.35 .

im going to be selling a shortblock in the not to distant future

/quote]

Whys that?

building another to push harder

bigger rods and some sleeves really

Mean! I\'m going to head down the 2.35 road in the near future to, Wonder what one will sound like with some 280 cams ;D

[hijacka]

 filthyrich']

[quote name='rex-leggy said:

i vote 2.35 .

im going to be selling a shortblock in the not to distant future

/quote]

Whys that?

building another to push harder

No I meant why the 2.35 over the 2.5?

You can\'t ring a 2.5 out to 8000rpm constantly.. shorter stroke = higher rpm

[filthyrich]

thats the 2.0 rods in the 2.5 block?

[Stoffa]

 filthyrich said:

I like the thought of the 2.5 as well....

Why the V3 heads over the V7\'s?

What pistons and rods do I want?

so you can use your original inlet manifold with manimal rewiring if you want to use that ecu

[filthyrich]

2.34 is 2.5 block, 2.0 crank, and custom rods, right?

[funkytown]

if its like the 2.1 stroker which is 2l deck and 2.5 crank, they utilize a factory rod for the block type and use a slight shorter piston but some bore.

(actually) even with in the 2.1 stroker build, you can use a factory rod and shorter deck height piston, or a long rod variant. - it just pays to do your research.

(fwiw a factory 2.0t and ej257 rod are identical )

the 2.34 you can actually do as a stroker or a destroker. the former uses a 2.2 block to start with and is stoked - and is what Rex leggy has, or you can destroke a 2.5 block using a 2l crank..

they have their respective different power characteristics so do some reading.

[rex-leggy]

 hijacka']

[quote name='rex-leggy said:

i vote 2.35 .

im going to be selling a shortblock in the not to distant future

/quote]

Whys that?

building another to push harder

No I meant why the 2.35 over the 2.5?

You can\'t ring a 2.5 out to 8000rpm constantly.. shorter stroke = higher rpm

i still have the 2.5 crank so is stroker not de stroker as funky said above .

as for rpm limit mines set to 8000 rpm at the moment the next block will be going higher (about 9000)

as for cams im working on uploading a vid of mine so youll be able to hear it with 274/272\'s

[filthyrich]

OK, so the 2.34 sounds sexy as hell.

I already have a 2.5 block, so the destroker seems to be the way to go.

I guess I need:

my 2.5 block

my 2.0 crank

some forged pistons

some forged rods

oil pump

gasket set

mls head gaskets

cam belt / tensioner

ARP studs / bolts

Clutch

Are my 565cc injectors and TD05-25G big enough?

Any other tips?

[funkytown]

as happens at times.. what are you hoping to achieve with your build? can you tell the pros and cons on the 2.34 stroker vs destroker are?

just dont rush in to it

who knows if injectors and turbo are \'big enough\'.. depends what youre out to achieve mate.

[filthyrich]

haha the pro of the destroker is i already have the parts

Nah im pretty good with the decision to do the destroker

I\'m not the best with turbos - I see a lot in the states with a GT35, and tbh i\'m not sure how the oldschool td\'s compare.

[filthyrich]

I *think* the TD05 will run out of puff before the motor.... the destroker is pretty rev happy

[funkytown]

what is the turbine / compressor measurements.. thats where you start.

[filthyrich]

Never mind sorted. I think all i need to figure out is pistons and rods and im good to go.

I\'ll talk to the guy thats doing my machining for that

[hijacka]

 rex-leggy said:

as for cams im working on uploading a vid of mine so youll be able to hear it with 274/272\'s

Goody can\'t wait! hurry up lol

[sultan]

you will need to strengthen the block. especially if you\'re going for high boost or high rpm

[rex-leggy]

 sultan said:

you will need to strengthen the block. especially if you\'re going for high boost or high rpm

also 14mm head studs is a must imo . theres lots to be thought about