V2 STI MODS ADDVICE new apexi and td05 20g +
 

Hi wanted some advice from the guys in the know,
i have a v2 sti with 62000 on clock,
it already has some tasteful mods but after driving my mates type-r
i decided i needed a bit more go so i have been buying bits for the car over last few months and am nearly ready to put all on car and get a remap but want some advice first.
here is a list of the stuff i have,

apexi ecu and controller
brand new td05 20g turbo
nur spec r exhaust
looking for a decent decat atm something like a hks pref heat wrapped
walbro fuel pump
4 pot front brakes 2 pot rears from a v5 sti with new mintex drilled grooved discs and red stuff pads

all that stuff is sitting in my cubard waiting to be fitted.

i was hoping to get around 350bhp mark, not really after any more think that should be enough have been told my redtop sti should be ok for that sort of power.

what about my injectors will they handle 350?
is it worth getting a front mount or will this bring turbo lag?
been told if only going for 350 front mount not needed?

i will also put new plugs oil filter and change all diff oils day before remap.

is there anything else i need to do ?

Your O/E injectors will be yellow 440 cc and these will max out somewhere between 330 and 340 bhp typically.
Do you know what turbo is on the car at present??? That may already be capable of similar power to your injectors.
I actually ran an STi3 Wagon on VF23 O/E turbo, yellow injectors, O/E ECU and O/E TMIC and it rolling roaded, several times, at 335 bhp 333 ft/lbs. The other mods were 3" exhaust with open neck down pipe, ported headers, matched up-pipe, all DEI heat wrapped and a manual GBE boost valve, (not a bleed valve) running 1.45>1.4 Bar.
I measured air charge temperatures and they rocketed off the guage scale at 70C without much provocation. Yours will be a slanted intercooler and this was a straight type. Yours probably struggles by 280 bhp.
I then tried an STi 8 TMIC, 550 injectors and Simtek ECU with one of my own turbos. 371 bhp at 1.4 bar out the box and it eventually did 392 bhp at 1.5 bar after some minor alterations and more mapping.
Subsequently I fitted a Hybrid GT FMIC and it did 401 bhp with no other alterations and 409 bhp after mapping. Still 1.5 bar.
Spool is exactly the same now with the FMIC than it was with the STi 8 TMIC. 1 bar in 4th at 3,200 rpm. Stories of turbo lag with FMICs are either pretty crap FMICs or poor mapping or some other reason.

Does the v2 not have 380cc injectors?

v2 STi.

gray 380cc

Thats what i was meaning the v2 sti , i am sure its the 380cc that are on mine.

LOL hey harvey after all these years is the grey matter going ;)

Sti 2's have 380's as standard and will not be good at all for what you need. 550's will be good up to the max of what the 20g will give you.

Thanks for putting me right. Obviously the car here has had yellow injectors, (96 STi) added at some point. :o

Which turbo harvey? MD321H? :)

Not an MD321 fan and certainly not on a 2 litre. Poor spool IMHO.

whats better in your mind harvey?

Is your turbo a secret that you don't... "cannot", divulge us then? :wonder:

Ok I have now got some 550 injectors! so they should be ok for the 350 mark.
i have another question which is something that has only just occurred to me!
being a v2 sti my current turbo has the turbo intake on the top!
my new one is front entry same as all cars after v3
so i am going to get a new turbo intake and run undrneath the inlet however they are larger in diameter,
i know i will need to re locate the header tank that's no problem really the bit i am puzzled on is if i do get a new intake how will my green maf sensor fit? will i need to get the larger one like my mates orange one on his type-r? if i do the plugs that connect the maf are different.
any ideas guys?

A cheaper, and less hassle, method is to get a 90deg Samco of correct diameter and leg length and clamp it to the collar of the FE turbo with a jubilee clip (thus creating the OEM TE 'snorkel'). Then the other, upturned, end of the Samco simply joins to the downturned black turbo elbow hose (that comes off the resonator, after the MAF) by an internal ally sleeve, clamped by two more jubilees...

humm i have already replaced the oem intake with a samco type hose modded to fit buy me with help from some geezer of the forums!
and i can see what you are saying and it does make a lot of sense plus i wont need to relocate my header tank,
but will the diameter not affect turbo performance, because the intake on my mate type-r is a lot wider than my one:brickwall!
i would prefer to do this option as its easiest.
opinions?

btw Thanks guys for you input:thumb:

Are you saying that the TD05 20g has a larger diameter collar, to take a bigger intake hose? (it does I think - bigger turbo).

You can get the Samcos where one leg is one diameter, the other leg another - and the transition from small to large is not stepped, but gradual. I don't think it will be a restriction... unless you wanted to max the turbo out when mapping (dependent on the supporting mods of course).

Yes it does have a larger diameter collar, the samco hose with one end larger than other is the hose i used to fabricate the oem turbo intake so i know what hose to get and where to get it from :)
i wont be using turbo to its capacity so guess it will be ok to go down this route,
wonder what power gains i will see?
when she goes for map it will have
pink 550's
td05 20g
new hks heat wrapped down pipe new blitz nur spec-r system
walbro 255 270 lh fuel pump
front mount inter cooler
apexi power fc and commander
complete service with new oils and plugs
now i am asking my self do i do up pipe and headers?
god this is getting expensive lol

Welcome to the world of Impreza ownership! :D


The limiting factor out of that lot will be the 550cc - but they're hardly lacking! :norty: You'll easily get 350/350 and the turbo won't be breaking sweat re. boost level. I reckon you may be able to get 370-380bhp and similar torque TBH...

I run my 20g at 1.6/1.7 bar on 10% meth and my 550cc injectors are at 96% at 4 bar fuel pressure. That will tell you how well my 90 degree elbow on an early car works.

PS i have a few more mods than that btw

What bhp/lb ft? :)

Not sure as it have never been near a set of rollers in this spec. I would say bhp wise just over 400 and probably about 350-360 lbs ft but thats just an estimate. The injector duty with fuel pressure kinda spells it out for ya.

Indeed. :cool:

Harvey,

Just a quickie, so you was/were running that power on standard V2 Internals then??? what box too??

Coulty what gear box are you running in your car? I have an 18g and 550 injectors to be fitted to mines shortly. I am just wondering what kind of power the standard box will take.

i am running an sti6 5 speed 754 box. God knows how long it will last. But should be fine for a while until i get a bigger turbo/injectors. I have heard from andyf that the newage wrx 5 speed boxes are quite strong so unless you wanna go the very expensive 6 speed option then thats probably the way forward.

In my experience, providing the 90 degree entry is smooth without abrupt corners or edges it does not restrict power from a TD05H just like Coulty has found out for himself.

joz8698 : Where does crap like that come from? I don't sit on Scoobynet all day/night like some people. I have far more going on in my life to allow me to sit on Scoobynet or any other BBS for prolonged periods so it can be days before I get back to Scoobynet when I am busy. Over a period of about 12 months I have been doing a lot of trials and testing with turbos, headers, uppipes and modification packages and I have now settled on a TD05 derivative front entry turbo, along with the rest of the package to give quick spooling and reliable performance in the 380-400 bhp bracket. Generally 1 bar at 3200 rpm in 4th.
Joz, you can have one of these for £925.
I will find graphs for this turbo with an STi 8 TMIC and Hybrid FMIC on the same car and there are several other graphs from other 2 litre cars all around the same 380-400 bracket.
555wrxra : If your car is a version 2 it has side feed injectors and the pinks are top feed.
To fit a front entry to a version 1 or 2 car MY93-96 there are several options. A 90 degree smooth bend as described by Joz above or you can lift the inlet manifold on Tufnol spacers and these are available from Roger Clark Motorsport or Carl Davey and others too I guess. Go for the Tufnol (not aluminium) and I seem to remember Carl Davey does a kit with 20mm spacers and socket cap screws. This will give you the clearance to put in a silicon inlet tract and adopt the same type of intake system as the Classics have versions 3-6. You may still have to move the power steering reservoir but conversion with an STi 7 reservioir bottle is very easy.
Another alternative is to cant the turbo back at an angle of about 25 degrees and then apply a smooth bend out towards the drivers side wing allowing a smooth inlet tract to the front entry turbo. This involves making a new uppipe and downpipe and is the system I adopted on my 95 WRX which does 422 bhp on V-Power with 1ml per litre NF. This is on one of my own TD05-06 20Gs which is not the same turbo referred to above.
I will take a photograph of this system but it does involve making a new uppipe and downpipe which is a hassle.
Be aware however that there are a range of TD05-06 20Gs out there and while some of the early ones were genuine 400 bhp turbos a lot of what is sold now are 360-380 turbos.
Pete : I assume you refer to my STi 3 Wagon at 409 bhp. This has standard internals and runs a TY754 gearbox. (In place of the OE 752) If I have misinterpreted your question let me know. The 95 WRX with 422 bhp is only limited by the turbo because it has Omega pistons, Arrow rods and various other upgrades. I plan to fit a further turbo to that to take it in the direction of 500 bhp but it depends what turbos are here unused when I find time to do that.
How long the box lasts is very much down to how the car is driven. The TY752 boxes are not as strong as a TY754, probably because the TY754 has a much stronger casing. The New Age TY754 boxes are virtually the same as STi 5 and 6 boxes apart from the ratios. I ran one of these well over 500 bhp and although I rived the centre out of the uprated clutch twice, the gearbox itself was OK. The first thing that went was the centre viscuous diff. The torque was enough to tear the pressed metal assembly in the clutch and the first time this happened was just after 186 mph run at Bruntingthorpe.
The six speed box from the New Age cars is stronger again but it is also heavier. That is what is in the STi 6 Wagon now but with the latest Forrester ratios which are wider spaced than the 1-4 on previous 6 speeds with higher 5th and 6th and I also have a PPG box in a 754 casing.

http://i44.tinypic.com/23k5hm0.jpg

STi 3 Wagon. 409 bhp. Standard internals. V-Power and 1.5 mls NF. HS380 turbo. 1.5 bar. Hybrid GT FMIC. Simtek ECU.
Max ACT recorded on power runs 22 C.
401 bhp on first power run before map adjustments but after slight tweak to FPR.

http://i41.tinypic.com/qpkpw8.jpg

Same car, same spec 392 bhp with STi 8 TMIC Same boost/fuel.
Max ACT on power runs 42 C.

http://i44.tinypic.com/2w523hw.jpg
http://i44.tinypic.com/28hzaco.jpg
http://i40.tinypic.com/35lc9yo.jpg
http://i42.tinypic.com/1ijtbm.jpg

95 WRX Wagon. One of my own TD05-06 20G turbos. 422 bhp. Omega pistons, Arrow rods, 740cc injectors, Hybrid GT front mount and ready for a bigger turbo.
As this is a front entry turbo the uppipe has been altered to let the turbo sit back allowing for a smooth silicon pipe into the turbo compressor inlet. Although this is a version 2 car STi 3 coil pack and plug leads have been fitted in preference to individual coil on plug as even with reduced spark plug gaps the plugs were being blown out.

:eek:

:wonder:

Harvey mate, it was just an innocent question - nothing more. :) Believe me when I say I wasn't asking it in a "Bloody hell, why isn't he telling us?!" manner. I asked that question as I thought it might be a work-in-progress trade secret that you, quite rightly, wouldn't want your competitors in on, etc.. So just wanted you to expand on any info on the turbo - if at all possible (which you have - thank you). :)

It's not in my nature to be arsey like that (haven't got the energy, for one thing :lol1:). Sorry if that was how the question came across to you, though. :confused:

Er... however, I have no comeback on this point :o :D :lol1: