Hi,

Title says it really. Have a relatively standard 06 WRX 2.5L Hawkeye. Only has a backbox on at moment and made 253bhp on rollers recently.

Am intending to put centre link pipe & de-cat pip on leaving downpipe standard (so its MOT friendly). Was told by the rolling road centre (DSA in Aylesbury) that my car could benefit from a better TMIC. So I have purchased a hyperflow scoobyclinic (APC type) TMIC - still to be fitted.

I believe the injectors are already capable of 550cc flow so do not need to change them.

Will be fitting a do-luck panel filter to the car before the Ecutec remap.

My question really is: Is it worth me upgrading the turbo, if so which would give me sensible power upgrade to 300-340bhp and still be gearbox/engine friendly without giving me massive amounts of lag?

Been looking at VF35, TD05-18G and 20G. Also possibly vf43 if I win the lottery!

Thanks, Andy.

 

Are you sure It's standard with only a back box? 253bhp sounds like it's mod'd. Standard is 227bhp. I have the same car with a turbo back cobra de cat system just waiting for a re map so I'm kinda in the same place as you. Wandering what if a new turbo will make much more difference and what else I will need to change. I know if your wanting around 300 you will need to upgrade your fuel pump unless you have already to a walbro 255. Andy Forrest told me for a stage 1 map this wouldn't be needed but anything over then it would be a must.

 

Totally standard. had 1 lady owner before me who rarely drove it! Thats what DSA said too, but we checked it a few times. Never been mapped. Am just luck to have good start point for mods!

Have heard different things about the fuel pumps. Supposedly the standard pump flows enough to cope with the remap. But I will also be fitting the Walbro 255 as they quite cheap, its definitaly worth it!

 

yes you would need a turbo as a td04 which is what you have wont give you more than 280 bhp tops, i would get a vf35 or td05 16g, minimal lag and around 340 bhp. this is also a realistic limit of your engine and gearbox as bigger turbos will kill them if remapped to their potential and if not then they wont be nice to drive. you probably wont want to hear this after you have paid for it but you would have been better off buying a second hand Sti intercooler as they are more efficient.

 

Try an sc36billet. That should sort your powers goals out

 

I agree that the TD04 is not up to the job, but cant believe for one minute that a standard sti intercoler will be better than a hyperflow TMIC??? To be honest I was looking for an sti TMIC but came accross the hyperflow unit first.

Would the td05-16G, vf35 or sc36billet be bolt on replacements or would they require new oil, water lines and pipes etc? I am going to be fitting the turbo myself so really want something with no suprises when I start the job!!!

 

Your car hasn't got PPP without you realising has it?
Have a look on www.andyforrestperformance.co.uk for a guide.
I used Andy's site like a checklist once I knew what power I was after.
Stage 2a has 334/335 on my 05 WRX wagon with a VF34.

 

Sorry to hijack, but what's the limit on tuning the hawkeye WRX engine? I have one, and I've upgraded it with a pipercross filter, Milltek 3" sports cat exhaust, walbro pump, colder plugs, process west TMIC with shroud, a harvey ported VF35 and harvey ported and wrapped headers and uppipe. It's got an ecutek remap, and produces 330bhp/340ftlb at 1.2bar. I'm very happy with it, the power delivery is excellent for a daily drive with a bar of boost at 2500 rpm and then holding 1.2 bar solidly between 2800 and 5100 rpm before slowly tailing off.

Like I said, I'm happy with the car. But, let's face it, it's never enough. I've got the itch for more, and as I see it I've got two obvious options:

1. Get one of harvey's modified TD05-18Gs and aim for up to 380bhp
Problems: while I'm happy to get a new clutch, I can't afford a new gearbox or forged internals. How much can the hawkeye wrx box and internals take?

2. Increase the boost beyond 1.2 bar, fitting a three port solenoid if necessary. Not sure how much more I'd get with boost at 1.3 or 1.4 though
Problem: I've been told by a well respected source that more than 1.2 bar on the hawkeye wrx engine is asking for trouble

Anyone got any views on the above? It seems all in all that the hawkeye wrx is a worse base for tuning than a blobeye would have been (I've got the wagon model cos I want the rear space, which sadly rules out an STi)

Cheers

Dai

 

Double post

 

Go for a VF34 if you are after a fast road car you will get 340/400 With full 400 ft/lbs @ 2800 which makes the car quick

http://www.andyforrestperformance.co.uk/27344.html

Go to this site Andy only dose subaru's and i think the best there is

 

Yeah that's who I contacted about my remap. Best to contact him sooner rather than later as he is very busy. He really knows his stuff and I agree with the above comment probably the best by far. Check his site that gives you all the info you need.

 

I'v got Hawkeye wrx,
When running a TD04
Hyperflow topmount, Cobra exhaust with sport cat, Tubular headers, K&N cold air induction kit. STD injectors with 10% methanol, The clinic on there rollers got 306 bhp & 376 Lbs torque out of it, and it was 280 bhp with 270lbs torque.
Keeping the TD04 with the above mode make a fast motor that is reliable.
when you start to get up above 330 to 350 engine will let go, Gearbox will let go, clutch will slip, rear diff will brake, been through all of them.
I would do the other mods befor changing the turbo.

2 years ago I got 3rd in mod class at scooby sprint for the year, with a std tdo4,
No lag with that baby.

Im now running a GT30 and 500 bhp, the car with the tdo4 was just as fast on the sprints.

So now im changing from sprints to timeattack.
track is where you require big power, roads is where you require quick spool.

Remember 300 bhp is a massive power. compaired to most other cars.

Bez

 

Sti internals are generally thought of as stronger than WRX internals, but is this still true of Hawks? Hawk STi pistons apparently let go at around 400bhp.

 

i agree with Bez, 350 will be the safe ish limit of the wrx gearbox. My plan was to mush my box into the 400 but the head gasket let go and i decided to go for the full build taking the car off the road for all of this year.

350 is still a very very fast car and i am sure i will miss the 5 speed which is great for everyday

 

Hi andy.
I think his car is a WRX not an STi.
But I also think the part numbers for Hawkeye WRX & STi Block, pistons, rods.
Infact the short motor are the same.

And it depends on how you drive your car,
But if you have 400BHP why drive it like a fiesta with 80 BHP
But if you have a fiesta with 80BHP and try and keep up with a scoob with 400BHP it only with 80BHP will go pop.
So style of driving I think too.
WRX gearbox are a week point! Defo.

Bez

 

Have you gone 6 speed now, how is your car coming on. & will it be ready for next year. (The start of)

Bez

 

I have just changed to a VF43 and it is worth every penny. I love the way the 2.5 pulls and was a bit worried about inducing lag with the front mount but there is none of it, feels like a proper turbo car now whereas with the TD04 felt more like a diesel with such narrow power band.

 

Oh yeah and you WILL need better brakes, ideally suspension too.

 

I'm running a Harvey's TD05 18G on my 06 WRX, also have a STI TMIC, Japspeed exhaust, Japspeed CAIK, my is running on 350BHP, 340LB/ft.

Remapped by RaceDynamix........it's the dogs.........

 

Hi Emz,

Sounds great!

At what point does it come on boost fully in 6th ie speed and revs?

 

Good day to you Bez,

Realised the OP had a WRX. Was just curious whether the 06 and 07 WRXs and STi's have the same pistons and rods - you reackon they are the same?

Andy

 

Totally agree with you. I would keep the standard Td04. Not worth the hassle and these hawk WRX's produce so much torque its fab

 

I would just add the tmic and map on your turbo as the car will have more power and it will be nice to drive, if you feel that isn't enough it would mean adding a turbo and tweak for more power.

 

next weekend

yep went with a 6 speed

 

Cool. Thanks for all the advice. Going to change the exhaust & filter as a start and get Duncan at RaceDynamics to map it soon with the standard intercooler. Will see how i get on with the standard turbo.

After that possibly fit my uprated tmic and change the turbo. we'll see!

Cheers all.

 

The hawkeye WRX gear boxes are much stronger than the previous TY754 boxes and will take more power/torque. Does the Hawkeye WRX have the Cat in the uppipe? If so you would be wise to get rid of it as it causes a fair restriction on the inlet to the turbo which affects your spool. Your engine should easily cope with sensible mods up to around 330bhp but you wont get that on a TD04 as you know, but you will also be a little short with a TD05 16g which is still a cracking road turbo with quick spool and better in my opinion than the VF sreies. The STI 7/8 TMIC's are efficient up to around 400bhp. A good set of mods would be remove catted uppipe if fitted on the hawkeye, remove centre cat and replace with straight through prodive pipe or the likes and fit a sports cat down pipe. Possibly Walbro pump, panel filter and remap. If you want more than around 285 bhp then fit a TD05 16g

 

If you were as quick with a TD04 as you are now with the GT30 then you must have an issue with your set up. I have went from a 16g - 20G - GT3076 and have took chunks out of my times every year and the tracks and hills up here in Scotland are pretty tight and twisty, no big power ccts.

 

The standard intercooler is suppose to be good for 400 bhp

 

They DONT have a cat in the uppipe

 

Personally if i was changing my turbo which I wont be then it would be for the STI turbo (VF43)