Style

iTrader: (1)

I fitted a equal length header this wkend, its all fitted nicely, but car seems much slower.

wasnt expecting this. turbo starts at 3k or jjust after, where as it started at 2.3 ish before.

is this to be expected, anything i can do about it

Turbotits

iTrader: (2)

There going to need to be mapped for and if your running a small td04 turbo i wouldnt bother they tend to make the spool up later in my experience

JohnD

iTrader: (5)

Equal length headers are usually reserved for part of a big HP build. They seem to be of no or even negative benefit on standard or lightly modified cars. A much better bet would have been standard headers ported by Harvey, API etc. You should at least have a re-map to pull back what you've lost or remove them !

JohnD

Style

iTrader: (1)

its a 1995 wrx import.

i think its runnig a Td05. is this right?

what other mods could i do to try and get the most out of them?

better injectors? walborugh fuel pump?

apexi ecu, could this be mapped for it?

Jay m A

iTrader: (2)

Depends what headers they are, if they're designed for big HP then the primaries and uppipe could be large bore and will adversely affect your spool and perhaps top end power if you haven't had it remapped.

As mentioned for a TD05 a decent set of ported OE headers will suffice - since yours are off get them done and sell on the equals - you don't need them untill you plan to go over 350HP IMO

Style

iTrader: (1)

well, going to put a little shopping list together.

550cc injectors, walboro pump, FMIC, Feul pressure reg, panel filter and a apexi ecu.

obviously i want to get the ECU set / mapped last.

if i put on a FMIC the fuel pump and injectors as it is now, will the car still be ok to drive around in, i just wont be getting any real gains, till i take a trip to someone to get the ECU set up / mapped? - is this right, safe to do?

Harryr34

iTrader: (9)

Once you have fitted all the parts listed you should get it remapped asap, it will be ok to drive it off boost.

Style

iTrader: (1)

will probably try and get a ESL daughter board or similar, and not go the apexi route.

do you think ill get gains from a FMIC, 440cc injectors, walboro fuel pump, these tubular equal length headers, fuel pressure reg, decent panel filter, 3" turbo back dcatted downpipe sports cat on center section and a esl or similar daughter board remapped for the above.

abny ideas what sort of gains i could expect?

and would 440cc injectors be ok, or should i go for 550cc's? after all this ill work on handling / brakes etc and leave engine as it is.

joz8968

iTrader: (13)

If you keep the TD05 and do the other mods you should easily get over 320bhp, so 440s at std 3bar fuel pressure might be a bit marginal i.e. will require getting on for 100% IDC - see here: Scoobypedia | Trusted knowledge for everything Subaru | Knowledge / Estimated Horse Power from Injectors

I'd go for 550s with those mods - may be able to run a tad more boost than with the 440s also, whilst not maxing the 550s out.

Jay m A

iTrader: (2)

440's will be fine for the TD05 but thats about it, 550's will make future proof to circa 400HP

Edit to say - 440's will be fine with the adjustable FPR

joz8968

iTrader: (13)

Oops . Overlooked the FPR in the list of mods initially, so agree with this.

Style

iTrader: (1)

ok cheers, so 550's without a FPR, and 440s with one.

is there any benefit or either? guessing the 440 route will be slightly cheaper?

do you get the mapper to adjust / calibrate the FPR to get it set up correctly as part of the remap?

andyxros

ive put some semi equal length on mine (so am told) and my mapper said it was more laggy so am in two minds wether to take them off and port the old ones but dont know if it needs mapping again after

Jay m A

iTrader: (2)

It should come with a gauge - in fact make sure you get one with it, then you can set it up yourself, you'll need to to get it running OKish with your bigger injectors.

if you go for 440's then set it at 2.6bar (vac disconnected) or 2.1 bar with 550's. Set it when the engine is fully warmed up. Then the ECU will sort out the fuelling as long as your lambda sensor is working OK. Drive off boost until mapped. Your mapper will then readjust to his preferred settings.

HTH

Jay m A

iTrader: (2)

Also you should get the FPR regardless, the walboro fuel pump has been known to overpower the OE FPR on the early classics.

ade_sti

iTrader: (2)

If car is near standard then take them off and sell them - waste of time mate I have been there. Headers are one of the last things to do. Bigger Turbo, remap, exhaust, de cat and other stuff worth doing before the headers. Untill you are getting near 400bhp then forget them to be honest mate. I was in exact same poeistion as you - get Harvey on here to port your headers and get his up pipe - you wil be impressed. I get full boost at 3000rpm with ported headers.

uk300scoob

iTrader: (24)

550cc injectors
walbro fuel pump
Fuel pressure reg
panel filter
full decat turbo back exhaust ( heat wrap down pipe )
equal length exhaust headers ( heat wrap headers )
fmic of large tmic
ecu remap

and you'll be spot on

Aztec Performance Ltd

iTrader: (234)

I will need mapping for the improvements.

Did you heat wrap the headers and up-pipe?

If the rest of the spec is up to it, a TD05 + Tubular Headers makes a stormer of a car.

Lateral Performance

iTrader: (20)

That's never been in question

Aztec Performance Ltd

iTrader: (234)

It is if you just read the first post and then skim the rest (badly)

harvey

iTrader: (48)

550 injectors can take the car towards 400 bhp. If you are not planning to go past the 380-400 bracket then you certainly do not need the parallel fuel rails so save your money. Similarly if you are happy around 380 bhp ceiling in the future there is no need for an FPR which could be fitted at a later turbo update anyway.
If you are staying with yellow injectors, 440cc and are prepared to max them out, 325-350 bhp then you need an FPR.
If you change the injectors you must remap. Same goes for a change of turbo or fitment of FMIC.
Unfortunately, like many others who have been badly advised, you have found to your cost, that tubular headers are generally for big power engines and poor spool is common on most tubular header installations. There are small bore tubular headers that perform quite well but these are usually specialised items for a quality set.
BTW, a TD04 generally maxes out around 280 + bracket and will not need an FMIC unless you are pushing it very hard. The TD05 16 G is good for 325-350 bhp subject to supporting mods and certainly on a Classic, will benefit from an FMIC.