heple1983

Newbie Question Just Curious

Done some searches and not found much.

I was just wondering what the difference between the WRX Import Engine and The UK Turbo Engine on a classic as the WRX is rated at higher bhp.

While i'm on the topic whats the differences on the STI's aswell.

Cheers in advance for any help!!

The_Judge

Here's a good place to start...

heple1983

Av had a good read found it very useful but i was after more information on actual parts of the engine that differ.

is it just the turbo??

AndrewC

No it's not just the turbo.

The differences vary between MYs but to simplify, WRXs have the same bottom end and heads as UK cars, STi have forged pistons and different cams and valve gear.

Andrew...

heple1983

So wrx's have the same internals and ancilleries as the UK just a bigger TD05 turbo

And

Sti's have Uprated internals & Heads, TD05, Larger Intercooler with i/c

Pimp Boy

The main difference between an import and a UK spec classic is about 20 bhp, & the imports have a rear wiper & come in black (as mine does), i think may also have a.c. Differences between an STI & WRX besides obvious body styling, (on STI) larger intercooler, uprated chip, larger brakes, but like my wrx if your planning on new suspension, 6 pot calipers & discs, front mounted intercooler, & new chip with remap then soon enough it i'll be weeing all over STIs, hope this helps

heple1983

Mines a MY99 UK Turbo

So i've already got 4 pots and larger discs and A/C

I'm more interested in the engine as i'm lookin into what can be changed over from a WRX/STI to my engine in order to improve performance.

Thanks for the help anyway dint know all imports had rear wiper thought it was just the 3 door STI

dij

I would like it if someone could give a positive answer to the orignal question.

I think heple has answered the question now,the heads arent actually different in terms of the bare cast head,its the cams, followers,valves that make it different.The block,crank,con rods are the same,except the sti has forged pistons.
So a bare engine would be the same between a WRX and UK classic on the same MY.

Interms of adding uppgrade parts,you can use anything from an sti 5 or 6 as long as you have the correct supporting mods.

heple1983

Cheers mate - Big help

Roojai

I think what would make the biggest difference, apart from turbo, would be the ECU. But then a JDM ecu will not be mapped for UK fuel

yhe chod

and i think the gearing is different.[final drive and gearbox ratios]
which give it better 0-60 times.

wrxsmo

Should cover most things here

The power difference is a little more than that, a '98Uk car = 215 hp whereas '98Wrx = 276bhp. Certainly worth taking into consideration if looking to buy !

Ayde

iTrader: (6)

heple1983 what mods are you running already if any?
I to have a MY99 uk, I went to the SIDC rolling road day at Prosport a few months ago and got just over 264bhp and torque was 260. Thats with a full de-cat (resonated centre), K&N panel filter and STI 5 intercooler with the STI Y-pipe, ECU is a std 801 and it is always run on Optimax.
I was really suprised with the figures and I think they are pretty genuine as the other cars that ran that day returned expected figures.
My mate had an MY98 a while ago and had a WRX engine, gear box and rear diff fitted as his original engine went pop To be honest there wasnt much difference in them but he had the lower gearing so could always get away quicker but because of the lower gearing he also had to go to a Shell garage more often too

StickyMicky

righty-ohh

does anybody know how the 276bhp classic wrx`s stand in all of this

ie: the pistons and such
do they still have the same heads and bottom end as the uk car?

stann01

OK THEN!

2O BHP? TRY 60.
AND COME IN BLACK? = MINES SILVER? LOL

Differences between an STI & WRX besides obvious body styling, (on STI) larger intercooler, uprated chip, larger brakes?? ==ONLY DIFFERANCE IS SHORTER GEAR RATIO!

YOU NEED TO READ SOME MORE ON IMPORTED MOTORS!

heple1983

Cheers lads think i got it now.

-------------------------------------------

Difference between WRX and UK Turbo is :

TDO5 Turbo
ECU Mapped for jap fuel

-------------------------------------------
Difference between WRX and STI is:

Short Ratio Box
Head, Cams, Followers and Valves
Forged Pistons
Intercooler
Re-Mapped ECU

StickyMicky

sum of the wrx`s came with vf22 vf 23 and probably vf24 ihi turbos as well mate lol

sum wrx`s had 440 injectors as well amongst other things

jonny gav

iTrader: (1)

right then-

pre 96 uk and pre 96 wrx and sti saloon has tdo5 turbo
pre 96 wrx wagon has tdo4 turbo(not sure about the sti)
post 96 uk turbo also has tdo4 turbo
post 96 wrx has vf turbo (vf22 i think)
post 96 sti has vf23-vf28

not all sti's came with forged pistons!

as for injectors-

all pre 96 cars came with 380cc injectors(phase 1 fuel rails)
96-98 uk cars have 380cc injectors(phase 1 fuel rails)
99-00 cars came with 440cc injectors(phase 2 fuel rails)
96-98 wrx and sti have 440cc injectors(phase 1 fuel rails)
99-00 wrx and sti have 440cc injectors(phase 2 fuel rails)

don't ask about diffs and g/boxes, it gets even more confusing

heple1983

i want to upgrade my turbo to one of these listed above which one is the best on to go for - i've gathered from searching that it is a front entry converted TD05

I have a MY99 UK Turbo

jonny gav

iTrader: (1)

the best one is the vf30, i have for sale!

heple1983

Well it would be if your selling one wouldn't it.

Anyone else got an opinion