sparkster

Starting from a standard Impreza WRX 2001 with I think 218bhp.

Modifications:
Tubular exhaust manifold (heat wrapped)
Walbro fuel pump upgrade
Up pipe
Down Pipe
Full decat system
STI top mount intercooler
Panel filter
Remap

Ive not been specific with the above but trying to give you my thoughts. Am I going to be held back by the turbo to get my the magic 300?

Any other changes or thoughts? Anything i'm missing? I don't think my budget will stretch further than the above plus labour.

Cheers,

Mark

Black-Hawk

iTrader: (4)

NO. turbo will strugle past 270.

prodriverules

iTrader: (52)

Yes mate the turbo is a tdo4 as standard so it might be pushed to get 300 out of it i'd say.

Suberman

I think that might get you somewhere around 280-290bhp on a realistic dyno. Using Andy Forrest's development car as a gauge, he achieved 300bhp IIRC on an 05 uk wrx with pretty much similar mods as what you've planned for but with an additional hybrid TD04.

So yes IMO, the turbo might be holding you back.

sparkster

I think i see where you are both going. Need to look at the turbo!!

sparkster

Ah ive just had a look at Andy F's website. Looks like a trade in for an AFP4H Turbo may be what i need to do!

Suberman

That will give even better spool than stock which i believe will make for a very driveable road car indeed.

greylag

Hi, would recommend also adding, sti pinks,vf35,lose the tubular headers, go for Harveys ported and wrapped standard ones instead. My 02 wagon is conservatively running 313/300 with this set up,BIG difference over standard. Then start saving for a big brake set up!!

antdye2008

I would speak to harvey too, i have a 2001 bugeye wrx and he adviced me to change the turbo to one of his td04.5 versions which i think is similar to andy forests hybrid version.
I had a full decat already and uprated fuel pump, then i had one of his wrapped uppipes put on and he mapped the car with bob and the result was awsome.

I have just got my car back today from harvey as i had it mapped again because i changed the injectors to the pink sti ones and i am extremely pleased with the results just waiting for bob to email me the figures through.

sparkster

Thanks guys. Havent been on this for about 6 years when i last owned a WRX but i remember why i did. Great advice - much appreciated.

zayd

iTrader: (1)

Why spend all that money on making a WRX into an STI when you can just buy an STI. Will you not spend the same money on all those mods, which once declared will cost you the same as an STI for insurance. Maybe you'd spend around the same if you sold up and purchased an STI.

I too have a WRX PPP Blob and once I tire of a lack of power, I shall upgrade to the STI. It does fine for me at the moment though. Sorry, I don't mean to dampen your initiative, just giving my humble opinion.

ade_sti

iTrader: (2)

You will get max 280ish, but most get around 270ish from all the cars I have seen mapped. Get rid of the "Tubular exhaust manifold" -spool will be crap - and just get a good smaller bore up pipe wich is slightly bigger that stock - as Harvey Smith who is on here to sort you out with one. You could also port you headers and wrap them also. Get a vf34/35 or a good conditioned vf28 for half the price. You will see around 325 - 335 bhp with spool only about 400-500rpm more than the tdo4 and once past 3700rpm the car will be pulling ahead of the tdo4. Also wrap the turbo exhaust side and down pipe. Ade

sparkster

Zayd, i know where you are coming from and good suggestion. I think the only reason i'm considering going this way is that it gives me the fun and control of building my own car to the specs i want. You have got me thinking though!

MattyB1983

iTrader: (51)

Is this a UK car with standard bottom end ???

sparkster

Yes it would be. The car isnt bought yet but i'm putting together a few scenarios together before i take the leap.

nosjunkie

iTrader: (7)

hi

mines a uk standard lump

running a vf23
standard headers
standard injectors
turbo back 3inch
FMIC
Walbro

and was mapped at 304hp

but work has happened since then

harvey

iTrader: (48)

Mark: You have no chance of getting 300 bhp with the above. 280 odd bhp probably. Much in line with what Ade says at post 12.
The mods and the order in which they should be done:
Walbro fuel pump
Turbo back exhaust system, open neck downpipe. It can be 2.5" or 3" but I would opt for 3" personally as it caters for project creep, fully decatted.
You will shoot yourself in the foot big time with a tubular exhaust manifold. You will greatly slug spool and have poor torque lower down. I recommend my ported OE Subaru headers, DEI heat wrapped with purpose designed, stainless steel, slip jointed, DEI heat wrapped and five new Subaru studs uppipe. £369 plus delivery exchange or we will fit in our workshop for a fixed £75.
Pink injectors and one of my TD04 and a half turbos. This spools as fast as a TD04 but with bags more torque and it does not become anaemic at 5500 rpm. 12 month guarantee. (The pink injectors have a ceiling of around 370 bhp).
With a remap you now have somewhere over 300 bhp.
Existing TMIC is OK at this level but if you were to go another 50 bhp or in that direction I would recommend a Hybrid front mount. (Always think about project creep so that you save needless expenditure).
A panel filter will add no additional power whatsoever and is therefore an expense you can save unless you are keeping the car long term in which case a K+N panel with a cleaning and maintenance kit will save you money long term.
If you want to go well past 300 bhp a VF28 will spool slower than your TD04 but still a fast spooling turbo. A VF35 will take you a bit further than the VF28 but spools a bit slower but is probably a 340 bhp turbo.
The VF28 and VF35 are both available second hand but you do run the risk of buying second hand.
I hope this helps.

sparkster

Harvey i will keep you in mind and many thanks for your advice. Top man.

Midlife......

iTrader: (2)

Just stepping back about 7-8 years I ran a Bug WRX at 300 plus BHP with some of Harvey's headers (and advice).

What a really nice car to drive, it had a Godspeed front brake conversion and eibach springs......I never thought it was going to break, the bug 5 speed ratio's were well spaced and it never gave the impression it was going to kill me LOL

Shaun

harvey

iTrader: (48)

Yes Shaun, that was a nice car and an all round package.
The thing is you don't need to go overboard with modifications to make these fast cross country cars.
I see lots of cars where the owner has gone OTT, wasted money and spoiled the car in my opinion but if it is his pride and joy who am I to say anything.