39 replies to this topic

[JRod]

Oh definitely, i wasn't meaning to insinuate anything like that.
But the injectors must surely be maxed out, from a safety point of view.

Yep. Next step is new computer and bigger injectors for the car.

[Naif]

according to many people who have had their injectors cleaned and flowed, stock grey tops flow 440cc stock yellowtops 480 or 500cc. stock grey tops are capable of 190 - 200kw, yellowtops around 220kw. as soop said the rs muffler is actually a gx item. having a gx muffler on your car will not prevent you from running over 10psi of boost, my brothers car ran a stock dump pipe and stock GX exhaust system, the car made 140.1kw atw on 1 bar of boost, i will also mention that it ran the stock gx fuel pump andit had no problems pumping enough fuel. i also thought it was cyl 4 which was the main culprit for detonating due to lack of fuel, altho i killed both 2 and 4 at the same time.

[Soop]

I have to ask. How much effort was needed to generate 1bar of boost with the standard exhaust system? Would I be correct in saying, that if you touched nothing other than the exhaust. The boost would actually increase due to the loss of back pressure post turbo?

[Naif]

I have to ask.
How much effort was needed to generate 1bar of boost with the standard exhaust system?

Would I be correct in saying, that if you touched nothing other than the exhaust. The boost would actually increase due to the loss of back pressure post turbo?

mine was running a turbosmart bleed valve, his factory boost control, the ecu has a jdm mod chip.

his car is now completely transformed, running my gtb engine, full tbear 3" exhaust, naifspec custom FMIC and CAI and 03 sti fuel pump.

[boost]

Interesting (but I guess also kinda obvious) choice of fuelpump naif, is it loud?

[Naif]

Interesting (but I guess also kinda obvious) choice of fuelpump naif, is it loud?

no, no louder then stock, the reason i chose this pump in both my brothers and my car is due to the fact you can get them for around $50, the last one i baught i got the complete insert into the tank from top to bottem, fuel sender and all, not that the actual mounting bracket was any good to me as one of the pipes is on a different angle.

the pumps are supposed to be good for around or over 200 LPH, walbro's are 255 lph, whether the walbro can actually flow that is another question, and then reliability comes into it.

[Soop]

I presume you were running similar turbo's?

[Naif]

I presume you were running similar turbo's?

both running td05h's, mine had a cai and 2.5" cat back exhuast.

[Soop]

So basically your mods allowed you to make more boost sooner? Or have i missed something totally?

[Naif]

So basically your mods allowed you to make more boost sooner?
Or have i missed something totally?

no, i was running a manuel bleed valve and he was running factory ecu controlled boost control.

[BMX013]

just curious with this guide, 
if i do the parallel fuel rail setup and fuel pump and headers and CAI (i already have 3" TBE with high flow cat, 3" resonator and a 2.5" varex muffler, 
you said to use the stock up pipe, should i be decatting this uppipe though?
by doing just these mods what should i notice most out of my car? (and then i would up the boost a little after )

[Josh.]

What car do you have?

Full exhaust and a CAI without a tune to suit is a very bad idea.

[BMX013]

What car do you have?

Full exhaust and a CAI without a tune to suit is a very bad idea.

i have a 2005 2ltr wrx (last of peanut eye)
you need a piggy back ecu in order to tune on a stock ecu dont you?

 

[Reevesy]

Ecu in your car is tunable no need for aftermarket or piggybacks.

[BMX013]

ahh this is good to know, cheers reevesy

so if i do the fuel system, the cai and headers and decat my uppipe and get a tune what can i expect to see out of my car from that?

[Josh.]

Your car doesn't have a cat in the up pipe and aftermarket headers would be unnecessary with a stock turbo.

Your stock fuel pump and injector set up is also more than fine for the stock turbo.

With an exhaust and re tune it should make somewhere around the 160KW at the wheels mark.

A CAI is just for the induction noise, it won't give it any more power.

[BMX013]

i thought the inguard box made heaps of restriction / turbulence?
 

[Josh.]

Apparently MSR did a heap of testing and found that it made fork all difference.

[SAV84C]

The airbox is good for about 200kw

 

CAI is good for making noise and better throttle response and thats about it...

[BMX013]

whats a good turbo upgrade for my05 wrx? im not gonna chase massive power i want like 180 atw maybe, it is my daily and doing over 400ks a week so dont want it breaking every thou, i do keep up with maintenance though so shouldnt realllly be an issue