So I started a post the other day about what rebuild to do in the next few weeks and decided on a 2.1 Semi closed deck to get 400bhp. Without ringing around the companies I said I would ( as I'm still in Tenerife until Wednesday ) it comes in between £2500 a £3000 depending on head studs. So where does the other £7k go , heads don't need to be ported and polished I have been told, ok a Fmic and a new turbo about £1000 , plenty of second hand simtek ecu's hear and their, I already have 4pot breaks so that just leaves me with the gear box is it as bad and expensive as they say?
Now I have always been honest from the start,I am not a mechanic and have always had NA cars so am new to the big boys club and am finding seeing if you want big hp you pay for it but £10k really ,

I am basing this question on a post I have found

https://www.scoobynet.com/general-te...r-2-5-sti.html

Let me know your thoughts guys

 

Tbho it can be done relatively cheap BUT that will mean it's not very reliable,10K is a bit high for 400 though,I'd say more like 7K is a realistic figure for a reliable 400 that is.

 

Ye I thought as much, I did forget to put up the link I found suggesting it will got at least five figures to achieve 400hp but hear it is again, is that 7k everything I mentioned above or am I missing something. And reliability is a no brainier who wants a ticking time bomb

https://www.scoobynet.com/general-te...r-2-5-sti.html

 

7 k yes sounds about right for second hand parts 10k if buying a lot of brand new parts believe me I know

 

Well the only second hand part really would be the simtek, I can get my brother to do all the fitting etc, I just can't see 10k unless all the work was done in the shop,

How big a job is the gear box upgrade?

 

A main cost is the 6 speed that'll cost £2500 all day long

 

I am running 440 bhp on my bugeye STi, I did the fitting of bits myself then got it mapped as bits where added.
My spec is; RCM headers and up-pipe, FP Green turbo, yellow injectors, Aeromotive FPR. FMIC, K&N induction kit, APS parrallel fuel rail kit & turbo hard inlet pipe & 3.5" de-cat exhaust and controlled by a GEMS ECU with 3 port solenoid on standard internals currently at 107k miles.
Labour can be one of the biggest costs so if you are mechanically minded and take your time you can save a good bit of money by doing the mechanical work yourself.
Take it yours is a WRX so added costs of the block or pinningwould boot the price up. Aswell as the 6 speed box.

 

Gearbox £2k
New turbo £1k
Injectors £400
Clutch £500
Good front mount £500
Induction kit £100
Exhaust £300-500
Ecu fitted and mapped £1k

It soon adds up

Without your engine build and if you want to have 400 bhp on subaru 4 pots you are a braver man than me, They were crap IMO at 330 on my last car, Plus then you need suspension components to make it go round corners properly.

 

Yep it soon ads up.that gear box is the killer. Well I will have to do a bit more saving or sell some of the mrs clothes. Do it cheap and do it twice : )

 

10 grand can easily get spent. As the list above, then add brakes at £1000 (yes you will need bigger brakes), suspension and handling mods can eat £1500.

Its not all about power, its the entire car that needs attention.

 

As above, supporting mods arent just things which will otherwise break if you put that much torque through them, you also need a chassis that can make the most of it!

If i were you, i'd stop chasing numbers and just stick some cash into a decent turbo/remap to make what you have more usable, then spend the rest on brakes/chassis/suspension. real world that will be a much quicker and more satisfying to drive than loads of beans in a standard shell.

If you do go to 400+, the 4pots wont keep up for long, so budget £750+ for brembos at the least.

 

Yes well as I'm approaching 83k I will probably get the engine rebuilt and keep it all under 340bhp but get it a good map in that instance I can keep my gear box, get away with a newage sti tmic and the turbo I have now as its not to old,

As its an sti v4 i would think the pink 550cc injectors be a good enough choice

I will get it to 400+ BHP one day but I'm a few ££££ short of what's needed I.e box and chassis upgrade and I can always do that in time if I got the engine ready I.e semi closed 2.1 stroker. I'm good for 330-340 BHP for this year I think.

 

So your goin for the 6 speed box wich is a big spend item / you have budget £500 for clutch
I would say running that box with torque figures mid 400's or higher. Your gonna want a Hyper twin clutch & that's another £1380 on your bill
Ov course this is all hear say & your 400 rated clutch may hold out /
If it were me I'd fit the Hyper for future proof piece of mind

Regards

 

It is possible to do 400bhp on less than £10k, but it depends a lot on how much safety margin you want.

I assume you have a plain Sti V4 not the type R or type RA? The gearset in the type R/type RA would be able to cope with 400bhp at a push, but the plain STi will not.

A cheaper option is to go for the gearbox from an STi 5/6 or P1. These can be picked up for around £600-£800 and are capable of supporting 400bhp.

STi v4 pistons are quite capable of 400bhp, but you'd need uprated rods; fuel pump and injectors will need to be changed. As for turbo, a front entry TD05-20g would give you around 380bhp on pump fuel. Although it will be laggier than alternatives, that protects the gearbox. Add an FMIC and 20% methanol to the mix and you would get 400bhp.

(Other costs would include clutch and mapping, as others have pointed out)

Doing it that way, 400bhp can be achieved for probably around £5k all in, but the margin on the components won't be huge, so there would be little scope to go further. All depends on what you want from it.

 

Just don't get sided tracked and let feature creep take control while doing the modding(kind of like me really lol) as it can spiral out of control.
I can't even begin to count the money spent but 10k was passed many many moons a go !!

 

For 10k I would aim for more than 400bhp. However for 400bhp I would think, as said, it can all be done for around 5k depending on your route, all 2nd hand parts of course.

Rob

 

The Newage Pink topfeed injectors don't fit an STi V4 without running newage fuel rails and an adaptor kit.
So instead buy some 740cc sidefeed injectors to future proof it for 400bhp.

 

Lets say your car is standard.
With a 5 grand budget you wont get much of a car, fact. Yes you could maybe reach your 400bhp target but as I said earlier, its not just about the power output. The entire car needs attention to make anything remotely good to drive. No doubt a standard car with a 400 ponie engine will be fun, but quick from A to B, na.

One place you could save a few quid is gearbox. Yes the 6 speed setup is at the top of the list, super strong and will take lots of abuse (they do break now and again though). But, if 400ish is where you want to be then a later 754 box will work just fine. You'll have to look after it but it will take the power, mine did.

 

Me too... My engine bits will have cost roughly 2500 quid this time around, and another 1100 for a gearbox, and I'm hoping to make just above 400bhp. That includes a used 2.1 engine (ODB).

I do all work apart from mapping however, as it's my get away after sitting in front of computers all day and looking after a baby most evenings. I need to get oily and filthy at least once a week, otherwise I get moody

I think that if you do all the work you can yourself, you can easily achieve 500hp for 10k, although it's a lot of work (or hobby time?) if you do it yourself.

 

10k for 400 !

Will I don't know what coat your running but I have less than 10k in my blob eye running 440bhp ! I got a front mount and induction kit fitted for 500 - a fully serviced and re ceramic coated billet turbo from lateral for 1k - new 850cc injectors 180 fitted again at cams gt spec headers and harvey up pipe 330 fitted form cams 3"downpipe and nur spec r 280 fitted at cams ! I've also had big brakes gutted - coil overs - gram light wheels and including buying the car I'm still under 10k !

 

People must not get confused with a standard 2001> STI Vs any other standard classic.

400bhp is by far more achievable with less cash on a newage STI as you already have a motor that's semi forged to withstand 400bhp (usually), and 6 Speed box. As per handling, the Brembos are not the best, but there not bad with some decent pad/ disc combo, all of which you don't get with a standard classic!

400bhp will be more fun in a classic than newage, for that I'm sure, horses or courses

Rob

 

I'm pleased I stayed sensible and didn't go out of control

 

I would budget at least 4k for a half decent 2.1 to be built up by a decent firm.

Then factor in:

6 speed setup or PPG
Uprated clutch and flywheel
Decent suspension setup to handle the extra power.
Decent brake setup as the Subaru 4 pot wouldn't even stop a child's pushchair!
Decent fuel setup.
A reliable 400+ turbo
Fmic
Aftermarket ecu
Induction kit to suit fmic pipe work
Bigger inlet pipe
Mapping

Etc etc.

Then you have to factor in labour costs, geo costs, possibly need bigger allows unless you can get a brake setup that fits under your current wheels. You will probably also have to go 3" exhaust as your current one will be restrictive.

Its very easy to spend over 10k doing it right.

 

 

Go buy a 2nd hand one with fsh and build history!!! simple answer! lol

 

But any 400+ bhp classic worth owning is still gonna be big money. Especially one with a built motor and 6 speed box. And to be honest, properly built 400+ bhp classics don't come up for sale that often.

Which ever way you do it, to own a properly good 400bhp classic impreza you will need to spend between 8 and 10 grand. Be it buying one already done or building one yourself.

 

Sell your car, buy a newage STi, bolt on a turbo and get it mapped.

 

Slight over simplification, and OP could still be looking at being 10k down in the process unless the sale goes very well.

 

go hard or go home!

 

For a proper rebuild with parts,labour and supporting mods I.e better brakes,suspension etc...you can easily blow 10K+,if you are doing the work yourself and sourcing good quality second hand parts yes you could get it down under 10K but that is the only way you could do it for a lower price.SJ.