I've got a 2007 STi and have done a few bits and bobs to it so far, the only 'power' mods I have done so far is by putting an Afterburner Centre Section and an Afterburner Vortex backbox on my car.

What further modifications would people recommend which are safe, reliable and are relatively cheap for what you get?

I don't really want to decat the exhaust system due to the noise levels already being loud enough as it is.

With regards to remaps what would people recommend and what could be expected in terms of power increases.

I am not too sure how safe such modifications are and with just getting my 2007 STi I am quite wary of things that may harm my motor in any way.

I live in the north east and ideally would not want to travel more than say 100 miles to get any work done if that is possible.

Any recommendations of modifications, people to see or places to go would be much appreciated.

Cheers

G

 

You need removal of second cat, upgraded fuel pump and remap this can take you as high as about 340bhp. Cost about £900

You may consider fitting the approved Prodrive performance pack which raises power to a handy 316bhp and retains your warranty. This will come fitted with a new backbox but then you can change back after fitment. Cost about £1800.

 

Cheers for that mate!

What are peoples opinions on whether to go down the PPP route or other avenues from specialised tuners?

How essential would removing the second cat be in gaining such figures, is it necessary?

How reliable are the more popular remaps for MY07 STi's? Just after lashing out quite a large chunk of change for my motor I really wouldn't want anything going pop due to the changes....

Finally does anyone know of any tuners in or around the North East area that have a good reputation for remaps?

Thanks in advance.

G

 

Mines a JDM STi & my mods are shown over there <<<<. Usual stuff eg exhaust, fuel pump, induction, better boost control & some wierd wastegate upgrade. B Rawle then remapped the lot Supposed to be about 375bhp albeit not checked on a rolling road as yet.

PM me for the cost.

Andy F is based up North / Scotland I think

TX.

 

Cheers TX.

I think its all about deciding on the warranty issue, if the general cost of a few bits and bobs plus a remap is around the £1000 mark then basically you are paying nearly double that to keep the Subaru warranty if going down the PPP route, which if you have a brand spanking new motor sounds sensible. However, for that money you are getting half the power you would be getting from a custom remap.

Decisions decisions.............

 

^^ Nice looking car BTW fella

TX.

 

Forgot to mention the same thing about your motor, very tidy!! Bet it shifts as well!!

Mine has been slightly upgraded since those pics, will have to get some new ones up soon.

G

 

The prodrive performance pack is quoted at 316bhp but i believe it is conservatively stated. I have this fitted to my car and have no complaints. I certainly havent any need for more power and my warranty is unaffected.

 

Forget the PPP,(warranty) as these engines are generally bullet proof and you dont sound the sort of owner that would abuse his car.

Go for a sports cat downpipe and a decat centre pipe (also from Scoobyworld) then get a uprated fuel pump fitted. (this mod is vital if going for a remap).

I paid £150 for a brand new Prodrive sports cat d/p and £50 for a Prodrive pump.(from scoobynetters)
I fitted the pump myself and got a specialist to fit the d/p for £80
I then took it to Powerstation (110 miles each way)for the map.The map was £650 inc vat and the transformtion is fantastic.

Hope this helps.

 

The new 2.5ltr STi's respond well to tuning and can produce very good results from relatively minor mods, for example a recent STi we mapped achieved 288bhp and 323ftlbs measured at the wheels, depending on the factor used this equates to as much as 360bhp and over 400ftlbs at the flywheel all at sensible boost levels too

Mods were H&S sportscat downpipe and decat centre
OE STi backbox
Walbro fuel pump
STi panel filter
Iridium spark plugs

To achieve a higher horsepower figure you would need to look at a bigger turbo.

 

Thanks for the replies!!

Just having a glance at the various tuner websites it does seem that somewhere in the region of £900-1200 will achieve the results that have been outlined above.

I know I seem to be dwelling on the point of warranty but at the end of the day I am 23 years of age and have just payed out my savings to buy MY07 STi so you can understand that I am quite apprehensive about invalidating my warranty.

With regards to remaps I am guessing that they come with their own warranty and any damage caused by the changes would be covered by the individual tuner?

Have there been any unfavourable situations documented on this forum where someone with a hawkeye STi had their motor remapped and it went wrong or any serious damage was caused due to the mapping?

As I really don't have much knowledge in this area I must apologise as I don't really know if getting a remap on a 2.5l STi which would invalidate the warranty is a risky thing or if such changes are pretty much bulletproof...

Thanks again for all replies.

G

 

There are no guarantees in life matey, your car could go pop in standard form, you just never know. My advice is if you are unsure or can't afford to suffer the financial consequences leave it alone and trust in the manufacturers warranty.

Personally I took the decision to go for it and make the best of a very capable engine. If you use your noggin and do the mods sensibly and using the right people you can minimise your 'exposure', but also making sure people can help you should you need to make a warranty claim. Keep any standard bits should you need to claim. When I sold my old WRX it was stripped of its mods and the PPP map and standard parts put back on, exactly the same if I have been making a warranty claim.

The other thing is I have a tuner near to me that I trust to make the best of my car. I would never want a dealer to go near my car to do warranty work anyway. It would have to go seriously pop first !

From what I have read of your mods you have gone some way to impacting your warranty anyway with the Centre and Back Box. The easiest and cheapest option for you to maximise your power without going to extremes is to fit the following...

Decat Rear Centre £70 H&S group buy now on.
Fuel Pump and Plugs £150
Panel Filter £55
Mocom racing Remap £450

Somewhere near £750 and you would get close to my 288/323 at the wheels. All the pipes are underneath the car and easily accessible should you need to change. The Panel filter/pump (easily changed back) plugs wouldn't be a warranty issue I wouldn't have thought and the map is easily changed.

The choice is yours but for me it was an easy decision. I only fitted the H&S sports cat because I already had it, otherwise I would have done exactly what I described. Prodrive claim the standard DP is equivalent to a sports cat anyway, although I don't know how much of a sports cat

PPP is of course the cautious mans upgrade, but in its latest guise is even more of an expensive decision. You get a decat rear centre, fuel pump, back box and a reprogrammed ECU. Of those parts that you get with PPP, all I can see you need is the decat rear centre, fuel pump and remap. Not sure I would part with nearly 2K to get those parts which can be had for a third of that money !

Hope thats useful, at the end of the day its your decision. My car now to when I picked it up is completely different. Its 20% more powerful with 30% more torque and I have reduced my in gear times by 22%.

<<<VMS

 

Pretty sound advice there mate, good post.

With regards to the modifications I would be looking at doing, they would be similar to what you have outlined above. Nothing OTT, just a few subtle adjustments and a remap to get the power to somewhere around 340/340 at the fly.

Cheers

G

 

Just choose your mapper carefully and find someone you trust and can work with. I chose Mocoms because Zak was the nicest fella I met in a long time, trustworthy and couldn't do enough to help me achieve what I wanted out of the car. I got no BS advice about unecessary mods so I only parted with my hard earned for the bits that mattered.

 

before you do anything else "i have had this from Mike Wood of Prodrive"

"the pistons are on the limits as they are, before any power increases are made changing the pistons is advisable"


then you can go to what ever power you want (within reason) safe in the knowledge that the pistons wont give out on you.

 

Does PPP change the pistons ?

 

Are you saying that he said that the pistons are at the limit when an STi is in standard form? In that case does this mean that the PPP is also a risky change or do you mean anything after the addition of the PPP on a hawkeye STi?

G

 

hi mr g
nice to see a new scoobynetter in the local area. think ive seen your car about. i live nearby in elmtree stockton
my cars off the road for a total custom rebuild. see it in projects 05 sti mickyjeff and you will see what i mean.
some really good people around pm me for details
i had the ppp on my newage blobeye. it was ok. i just felt i could have done a lot better for the money.
knowing what i know now. always open for a pint and a chat
cheers mick

 

Alright Mick,

I am always up for a mini meet, with working shifts it can be tricky for times although I always get 3-4 days off every 4-5 days so it shouldn't be an issue one night/weekend. Thanks for the offer!!

You didn't pull up alongside me at the lights outside of Central Park around 2 weeks ago did you?

Just had a few bits and bobs done to my motor and gave it a good clean, pics here:

https://www.scoobynet.com/scoobynet-...ml#post7265088

G

 

Ive got a MY2006 STI, mine had the following upgrades, Milltek exhaust with sports cat, panel filter and remap by powerstation, it was producing 342bhp and 346lbft.

I then wanted more power and added a perrin front mount intercooler and gen spec II headers and another remap by Andy Forrest, it was then producing 379bhp and 390lbft which had maxed out the standard turbo.

The car ran fine for about 6 months, then the cylinder head gasket blew and I needed a engine rebuild, dont know whether the extra power caused it to blow, but alot of people have told me that 340-350bhp is about as much as the 2.5 engines can take in standard form.

The cost of the engine rebuild was £2500 this did include for upgraded pistons, rods and bearing along with some other bits.

Just thought id let you know as it can be expensive to repair the damage after its happened.

 

Interesting, how many miles did you run it for at 379 ? Type of driving road/track ?

 

Thanks for posting up parmin!!

I was going to ask how much power the stock internals could take before something went pop. With a few alterations I am going to be looking for around the 340bhp/360lbs/ft

There seem to be quite a few people running this sort of power in a hawkeye so hopefully theirs and mine doesn't go pop when I get the work done.

G

 

decat, induction kit and remap, but bear in mind heat is an issue without uprated oil cooler

 

I have read about HG's going without any mods on the 2.5. I think its luck of the draw TBH.

https://www.scoobynet.com/scoobynet-...68-gutted.html

Personally I feel happier knowing my car is mapped specifically to the parts fitted, higher output or not.

 

with impreza's fitting a generic map, other than the prodrive is asking your engine to go bang

 

You only have to read some of the chalk and cheese experiences of the PPP package on what would be considered to be identical cars, to know that generic maps have their 'issues', even if its just value for money.

 

well the only reason i say it would be the only one i'd ever have is cos you'd have a warrenty, personally though i'd decat and tech 3 all the way lol

 

Yes - they can be expensive to repair 'if' they go bang. But you could have spent £1800 on much lesser performance with the PPP.

Mine has been running 360 ish bhp for over a year now and regularly sees track action. If time is taken to maintain the car, and minimise the chance of det - there should be no reason why they would go bang.

If they do go bang .... £2500 aint that bad considering you now have an engine capable of sustaining so much more