chrisdicko

iTrader: (21)

I currently have:
3" Full de-catted Exhaust,
Uprated up pipe.........not sure about headers, how can I check this?
K&N Cold Air Intake
Uprated Fuel Pump
ECUTek'd ECU
Dump Valve
NGK PFR 7B Plugs

If I bought a new turbo, and had it remapped to accommodate this, will it make much difference to my BHP? Maybe touch 400BHP? The intercooler would be ok still I presume, rather than spending for a FMIC?

What advantages would I have adding a Fuel Pressure Regulator now as well...or would it be a waste of money? As they aren't too expensive really.


Its a 2003 STI.


Thanks

chrisdicko

iTrader: (21)

bttt, with a few more questions..........

Obviously a FMIC would help.....and this seems very cheap, would it be worth adding?
Intercoolers : Subaru impress front mount intercoolers, fmic, impress front mount


I can get a HKS Fuel Regulator for £30 as well from someone at work, so would that be worth buying now as well for when I save up for the turbo?

Thanks

weeebell

iTrader: (1)

Your standard STi intercooler is good for 400bhp.

Adding a Td05-2og and a remap will see you to around 360-390

For the magic 400 you'll need another set of injectors. 650's.

The FPR is a good mod. Its a safety thing to stop you underfuelling.

chrisdicko

iTrader: (21)

So the intercooler may be on is limit if I want 400BHP?

Was hoping not to have to change the injectors, but not to worry.....just meants more saving!

So really what I'm aiming for is:
New turbo
650cc Injectors
FPR
Maybe a FMIC
and a remap?

And I might near the magic 400?

chrisdicko

iTrader: (21)

Having a read on the Andy Forrest site, it says the 550cc injectors are ok up to 440BHP, so I wouldnt really need to uprate them would I for the time if I was going for 400BHP?

Also, from ANdy Forrests site, it says the standard TMIC is well for over 450bhp with an appropriately sized turbo........so again, I wouldnt need to change this would I?

chrisdicko

iTrader: (21)

Any other advice you could give guys, with what I will need etc?


Thanks a lot

dunx

iTrader: (3)

You can reach 400 bhp by adding an fpr, and screw 0.5 bar more pressure into the system, this flows more fuel through the std injectors. Works for me !
Definately need a re-map, I did the above and on the rollers it went crazy weak at 4800 rpm and would have melted everything in seconds.

You could try the top mount, and then if you have problems, add one later when the wallet recovers, but then you will need a map tweak to get the most from the FMIC !

HTH

DunxC

chrisdicko

iTrader: (21)

400bhp from just the fpr? Seems good! lol.

Is it not dangerous to the engine cranking the pressure up? I thought it should be set to a fixed pressure like 3/2.6 bar.

For the time being, I may pass on the FMIC and injectors, and just buy a new turbo, fpr and get a remap and see what that produces.

joz8968

iTrader: (13)

The whole point of an FPR is to be able to raise the fuel pressure over the OEM one to allow more fuel through the injectors in any given amount of time. This gives the injector duty cycle a much easier time, so you also build in some headroom re the IDC too i.e. so you won't max out the injectors on full boost/WOT (dependent on how aggressive the map is in the first place).

Basically, the mapper can map for the max amount of fuel available for max power i.e. have the IDC close to 100%, or be bit more conservative with the IDC to trade an ultimate peak bhp figure for 'safety'.

chrisdicko

iTrader: (21)

Oh right, I see!!

Will a mapper alter the FPR for me? As I was going to get a new FPR fitted soon-ish, and just set it to a 'standard' pressure. But then when it comes to remap time, would he then adjust it?


Thanks

joz8968

iTrader: (13)

Yes. When you speak to the mapper prior to arranging a mapping session, you can brief him on all of your mods and the FPR etc.

He'll expertly map the max amount of boost and optimum ignition advance for the available fuelling on offer, for what is safe for all RPMs/loads, etc.

chrisdicko

iTrader: (21)

Sweet, thanks for that! I understand a lot more now.

I'll get it fitted, and set to the OM pressure, then when I get it mapped I will let the mapper know so he can change it.

Thanks

joz8968

iTrader: (13)

I believe so.

When you fit it, set to 3bar (vacuum hose off), then reconnect hose. You'll be okay to drive like this prior to the map as you'll have at least the same (if not more) pressure to the injectors as before anyhow. If anything it'll be running a little rich (not a bad thing, short term).

It might be the case that the after market FPR's do not require the upping of the pressure at idle, as they keep the pressure in the fuel rails higher in the first place, because of the stiffer spring's (diaphragm's?) increased resistance to pressure anyway? Not sure? Someone will fill you in with the science bit , I'm certain...

Ultimately it won't matter, as the mapper will know whether to alter it before he goes-a-mapping anyway. Just be sure to tell him that you have it fitted .

chrisdicko

iTrader: (21)

Nice one dude!! Really appreciate the help.