Nrbg455

What would be my next thing to address to start looking for bit more power, oh engine has bin built to take more power already,
i have
full exhaust system
fuel pump
Induction kit
3 port boost controler

Was thinking the following as a 1st port of call

1. Injectors 1340cc
2. FUEL RAILS.
3. Fuel line kit
4. FPR with gauge
5. TGV housings
6. Turbo inlet

and what sort of power does standard turbo take think I read 390bhp? Is that right before it is maxed. Was reading few posts and most are either stage 2 like me or are fully built up over 400bhp and am in middle at minute so to speak I think.
Cheers for help

stockcar

1340cc injectors aren't required unless your planning to install a GT35 or whatever??

Nrbg455

Nope 450bhp was the limit but I want a turbo that does 500bhp but maped for 450. Smaller injector size then, if I used 1050 then I could use stock fuel rail?

stockcar

we do both 750cc and 1000cc kits (as well as far larger for more involved projects)

at 450'ish the 750cc will be more than capable

Nrbg455

Cheers pal
would you add anything or change anything to my list above or is this a good start. I don’t want to run anymore power at minute until car is ready for it so any extra advice u can give would be appreciated.

stockcar

with the std turbo you don't need fuel lines or rails / FPR IMO - even when aiming at 450 it would be a 'nice thing' rather than required.........

biggest issue you will have once you approach 450'ish is the std soft valve springs

Nrbg455

Dam I put my attention into short block rather than heads, might have to address this when I get to 400hp thanks for tip.

stockcar

personally wouldn't advise above 450 on a std short block anyhows unless it has already been "closed deck" converted and good quality forged pistons / rods

Nrbg455

Yes it has bin closed decked and 14mm head studs and good quality pistons and rods my limit was 450hp, just trying to establish parts I need don’t need. Brakes and suspension mods have bin done already, I no this part will take longer as it is expensive and will take time to get there

Danjo

If 450 is your limit then you are better off sticking to a turbo suited to that power level, such as the MDX321T which is a fantastic turbo (I used to run one myself on my 2015 STI). Something like an MDX321V or a Precision 5530 will hit 500bhp but will suffer from more lag giving you a very narrow powerband, particularly if you are still on stock valvetrain, so it’s not ideal to run a turbo like that at “only” 450.

Nrbg455

cheers for that pal will keep that turbo option in mind when I get that far, also what is the 2015 sti ecu like when u reach 400hp to be honest I have my heart set on a syvecs or something what did u run ecu wise ?

Danjo

At that level the standard ECU with Ecutek is just fine. It can have a number of failsafes enabled along with motorsport features such as launch control, flat foot shift, auto blip etc. My car is currently undergoing a 700bhp capable build and I have an Emtron ECU (equivalent to Syvecs) but it’s a little overkill for 450bhp.

Nrbg455

So quick update decided to have following work done early dec
car runs 357bhp and 358lbsft at min.

Suppose question I would ask would be will I notice a difference when it’s all fitted and maped?.
Didn’t fancy bigger turbo at min as didn’t want a lot of lag as supporting mods are not were I would want them yet.

Bigger Top mount intercooler

Reconditioned VF48 turbo bigger compressor wheel fitted

Ceramic coated Equal length manifold and up pipe

TGV housings

Turbo inlet

injectors if required

FPR if required

Nrbg455

So got my car back last week with new upgrades and car runs FP black car made 463bhp and 449lbsft at1.5bar which was turned down, unfortunately on drive home intercooler hose came of on 3rd pull of the day.
I heard the normal noise of intercooler pipe coming of and no other noise.
my exhaust had a big plume of white smoke come out of exhaust. my power band is now shifted dramatically to right turbo starts at about 3900rpm and finishes at 6800rpm
1. will my turbo be in need of inspection? Bit worried.
2. What can standard heads take ? think I read 8250rpm

Nrbg455

The power is turned down as my ecu struggles above 1.6 bar but. Am thinking after I get car back and prob get turbo checked just for peace of mind I may save to get stronger valve springs and valves in. Just wanted to no what people have done at this sort of power level also waiting for link to release software for my car year

lockheed

iTrader: (1)

• Doesn't matter how much power or boost you have ,standard valve train wont cope very long if at all over 8k rpm

Nrbg455

So 7k on standard heads is fine then.

Danjo

If you want to push over 500bhp there’s a lot that needs to be taken into consideration. The standard liners don’t like much over 500bhp so there’s always a risk of splitting one. As has been said, you’d need stronger valve springs at the very least. A parallel fuel system would be wise, as would something like a twin in-tank fuel pump setup.

Im running 560bhp / 600lbft on mine but it’s built to handle much more.

Nrbg455

Think your misunderstanding me lockhead
am jumping from 360hp to 460hp and having to learn the car again I used to change gear at 5.5k to 6k now I am still on boost at this lvl and having to adjust and feel bit uneasy about going to 7k didn’t say I reved past that

Nrbg455

Don’t want to go past 500hp goal was always 450hp 450lbsft. In future will see.
parallel fuel kit already done.

Danjo

Did you get a power graph from when the car was mapped? That’ll give you an idea as to when it’s best to change gear. You’ll see when the power starts to tail off. My engine/heads are built to handle 8k rpms+ but the turbo I’m on currently isn’t flowing up there so no need to rev that high.
these engines don’t like to rev as standard, they are about mid range torque unless built otherwise.

Nrbg455

Yes m8 I did 6800rpm I think turbo finishes, just a bit paranoid as previous car was nothing but probs, granted this is different platform and hasn’t missed a beat.

Nrbg455

I got the car back the other day was just a intercooler pipe that came off and popped back on again, was out on tues nite getting used to the car again from having 360hp and now having 460hp car feels fantastic am well chuffed lol. It drives great round town it’s like turbo is asleep lol until u get an empty road to blip. Also loving the turbo whistle as she tootles about and all the other noises g8 fun next stop twin plate clutch.

Danjo

You don’t really need a twin plate clutch at that level. I’ve got a competition clutch stage 3 and it feels as light as stock, it’s a fantastic clutch.

Nrbg455

Oh ok cheers pal il have a read into it.
don’t suppose anyone knows about link ecus I have seen there Version 10 but can’t see anything for my model.

Danjo

I’ve seen Possum Bourne Motorsport in Oz using a Link on the VA Sti, so it shouldn’t be long before it’s over here. Otherwise it’s Syvecs, Emtron etc.

Nrbg455

Anyone done any valve train work and doesn’t mind giving there views.
getting to that stage we’re I am starting to want to refresh my engine and at same time do some head work, now that clutch and engine mounts are booked in for dec, then new ECU with bigger radiator and EWG setup following in April.
was hopeing to pick peoples brains who have had this work already done or are clued up.

how far did they take there head work as I see it is very easy to get carried away with putting extra bits in 😂, my heads are standard at the min.

JdmSti2006

my 2.0 jdm is in Andy Williams hands, it will have supertech valves kit fitted,will stay with oem cams. Was thinking about 272/282 but more aggressive You go more troubles at low rpm's ,not really fancy it in a road car where oem jdm engine revs to 8k anyway.Mine will be around 450 horses when done.1000cc injectors from stockar ,process west top mount intercooler, oem fuel system apart lph340 fuel pump and Chevron anti surge assembly,act hd clutch with streetlite flywheel, link g4x ecu,engine oil cooler,baffle plate,4 cylinder cooling mod- have it on shelf than why not ,some suspension upgrades, owens twinscroll turbo.
Already driving 2.0 hdi ,it reminds me why I chose subaru as a daily.

Dan.jo

It depends what you want to do with the car and what your power goals are. My engine has been built for 700bhp upwards so I went with fully built heads to include the following:

-Brian Crower stage 2 camshafts
-Supertech cam followers
-Supertech double valve springs
-Supertech titanium retainers
-Supertech nitrided inlet valves
-Supertech inconel exhaust valves
-Supertech valve seats
-Supertech viton valve stem seals
-porting and polishing as applicable


The above is required for my power levels but would be overkill if you are looking to keep the car circa 500bhp or below.

JdmSti2006

bc stage 2 272/272 or 276/276 not to aggressive than, curious how good are oem jdm cams till ..hp?