Right,

Just bought another Impreza.

Dont want to go down the same route as my last one, as i feel i spent far too much money, and ended up chasing figures, rather than getting a car with good driveability.

I'm thinking of doing the following, to my MY00 wagon.

Full decat (possibly Revolution)
Ported standard headers
Walbro 255 pump
Am thinking about one of Andy.F's hybrid TD04's, just to keep the low down spool etc...
Ecutek remap from Andy.

Not sure if i'd need a fuel reg or not...
And induction wise, i want to retain the airbox, so looking at a panel filter, with a decent cold air feed.
And not sure about an up-pipe...seeing as it would all be coming off anyway.

How does all that sound for a sensible tuning option ??

 

i would add an avcr for better in gear boost, an inlet pipe and a cold air kit, those will give better acceleration even if they dont give better bhp

 

Do you really think i'd need an inlet and avc-r ?

 

Nobody else then ???

 

I think you're being very sensible.

What about a better TMIC? Not necessarily STi8 but certainly a post MY01 model.

Small bore tubular uppipes work well with ported headers.

May need an fpr.

 

Hi Guy's - Would you need to look at larger injectors maybe ?

Rob

 

440cc already, should be ok for the amount of air a TD04 hybrid can push.

FPR could help there as well.

 

Cheers Andrew.
I did consider a larger tmic, possibly MY02 Sti..but not sure if i'd need it with such "little" mods.

Rob, the injectors on the MY00 are 440's, and with the setup i'm looking for, they are more than enough for the job.

 

Well the MY99/00 TMIC is quite restrictive compared to the MY01-on jobbies so your little turbo will be working more efficiently to make the same boost, you may even be able to run a bit more boost without it getting sparkly.

If you're seriously thinking about a hybrid TD04 then you need to get Andy's advice on what cooling works best with it.

Andrew...

 

FE td05 releases so much more and since it is a straight swap, would be a crime not to!

I would go with an ecutek over a power fc, simply for the fit and forget unobtrusive factor and the standard idle control.

 

How you doing mate?
A Revolution exhaust system will make a good difference just for starters as will the ported headers if done properly. Andy will confirm. The O/E up-pipe will do the job and can be ported too or you could go to an aftermarket as Andy did on the headers comparison published in Scooby Mag recently but whatever you do, do NOT go to a big diameter up-pipe as it will slug spool and kill the benefits to be had from the hybrid turbo.
Wrap the headers, up-pipe and down pipe. Do a bit of under bonnet heat management.
K+N or STi panel filter with mods to the air box to get maximum cold air. No need to spend a lot on this as you can knock something up yourself.
Chances are your FPR will be OK. Try it and see. The fuel pump and injectors are good to 330 plus BHP before you might need more fuel pressure to extend the injectors, (may be good to 350) and that is where your hybrid turbo will be a limit anyway.
An AVC-R would be an unnecessary expense on this planned package.
There are always benefits from colder induction charges but it might not be necessary at this level. It will cost about £50 for a very neat guage to monitor air at the throttlebody. With that info you could make an informed decision and know what improvements you achieved if you actually fitted a replacement.
Also with the guage you can see what effect any changes you make, may have.
If you want help with headers, let me know. I have a spare set here.

 

nothing wrong with the PFC idle control Adam.. alters the timnig to keep it stable and uses the lambda sensor for fuelling etc..
Can be fit and forget with no commander too..

Simon

 

Again, many thanks for the replys guys.

Harvey, i'm doing grand thanks. Great to be back in a scoob again.

I've been deciding on an exhaust for the car, now most people have recomended the Revolution, but i really want something thats not much louder than standard...

Been doing a bit of reading on the up-pipe, and as you say, it does kill the spool slightly, i made this error on my last one, matched to HKS headers and a VF30, and i think the up-pipe took away any advantage that the headers should've given.

I may take you up on the headers...but just not quite yet.
I've only just got the car, so want to make sure belts etc are all changed, and everything is 100%, before i start tinkering.

I really dont expect to get near 300bhp or anything like that...
Just want to improve the driveablilty, and have some decent midrange power.

Thanks again for your input fellas.

 

I would disagree with you on one point Adam.

Jonny is looking to keep the low down spool, the TD05 will lose that.
I have just done some back to back testing (published in next months scoobymag) and although the TD05 made more power than the TD04 hybrid it doesn't necessarily make for a quicker car once the full used rpm range is considered.

Regards the Ecutec I would agree that in this case it is a better option than the Power FC. Cheaper, just as capable and retains the ability to auto adjust to lower octane fuels.

Andy

 

Harvey, a good plan which I can confirm that it does work

F

 

Cheers.

 

Sorry for the late replies guys.

As Andy says, i wouldn`t get the lowdow spool i want if i used the TD05, fair enough, it`ll make better figures, but i`m not after top end power with the car.

Got a 3 inch system on the car now, just need to get the downpipe to match, then i`ll be pestering you guys for ideas on the cold air feed, as i want to retain the airbox/panel filter.

 

Right...

Change of plans.

There's now a TD05 going to go on the car..
Should i still opt for EcuTek ?
Or move towards the Apexi ?

 

lol,

I would listen to andy, not just because he agrees with me, but also because he knows what he is doing!

 

Cheers Adam.
Hopefully it would be Andy mapping it anyway.

 

While making it more powerful at the top end, TD05 will stretch capabilities of the stock gearbox. Really work out what you want - best road car maintains realyl quick spool, and a suitably modified td04 provides this. If you want ultimate track performance, then td05.....with the gearbox caveat.....

Richard

 

Thanks Richard.

Very aware of the weakness of the gearbox, especially with TD05 and above, but after some thinking, i have decided to go for the 05 over the hybrid 04...i think.

I guess it's a "suck it and see" kinda deal.

 

Ok, another thicko question.

I know Harvey advised me not to go for a large bore up-pipe, but what size is recommended ?

 

45mm bore if you can find one.

Andy

 

Thanks Andy.

I'm sure H&S would make one for me that size.

 

Or do you know anywhere else i could pick up a small bore up-pipe ?

 

Regarding up pipe, I guess you've already got your plan, but this photo shows standard and flowed OEM pipe. Standard one really is a bit poor don't you think ? Especially if you have gone to the bother of changing the manifolds.

BTW I have a spare standard one you can have if you fancy getting freindly with your drill and a grind stone !

 

Thats always a thought matey.
As the headers and yturbo are all coming off anyway.

Although i'm not too clever on the old DIY side of things..

 

What size are the Helix uppipe supplied with GruppeS headers? I know they're smaller than my 2-and-a-bit inch H&S jobbie.

Andrew...

 

No idea to be honest Andrew..

Anyone running one ?