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$5000 To Up Performance, Rb25det, Best $/kw

qikstagea

By qikstagea,
in Engines & Forced Induction

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qikstagea Mentor

qikstagea

Posted
Posted

Ok. The said RB25DET takes pride of place between the strut towers of a 97 Stagea. Car was originally designed to be all show no go, but... stuff it. Lets go.

Im sure we've all sat down to figure what the best bang for buck performance upgrades would be.

Exhaust. - 3" turbo back. Probably a BATMBL or BOs Important dump, 4" (?) highflow cat., resonator for 3-4000rpm, cannon muffler, something with a decent note.

FMIC. - 600x300x76, with 2.5" Aluminium piping, Through GKTech.

Highflowed standard turbo. (would sell my working turbo, and buy a highflow.) Had my eyes on yours, alex- I knowll you'll be reading this.

Computer (not sure whether to go piggyback or full replacement)

Should i be upgrading injectors?

AFM? A Z32...?

Cams? Ive heard good things about Tomei Poncams. Adjustable cam gears....? just the exhaust, apparently...

Do i NEED a pod filter, or would a K&N panel in the factory box be adequate?

Does a CAI make a difference on an intercooled engine, seeing as the air is just going to get heated passing though the turbo anyway? Id like to keep the inlet tract as straight and short as possible.

post-24895-1158500678.jpg

For $5000 (give or take $1k) what would be the best upgrades? needless to say, slotted rotors and S2 calipers with greenstuff pads are on the way...

Hope i get some decent answers, ill leave you guys with it.

qikstagea Mentor

qikstagea

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upgrade your brakes before you make it go any faster

ok thx read the post bwud.

Power Fc + Z32 AFM + Injectors

Theres approx $2500 gone

They arent exactly the first things you would do though, are they.... no...

I had looked at power fc's, and have used one with the commander unit in a 180SX, i like the thought of being able to make modifications on the fly, with the knock sensor etc, injector load readout and so on, but dont think they have one for the RB25DET auto...

_8OO5TED_ Mentor

_8OO5TED_

Posted
Posted

first things would be intake (cooler/airbox and cai) then exhaust. beyond that the stock RB25 ecu is dodgy so some type of fuel/ignition controller at minimum is required, so pfc with z32 afm (if it can work with the auto) or perhaps a safcII/ITC combo. upgraded fuel pump is generally a good idea at this time too.

qikstagea Mentor

qikstagea

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there are no suitable stand alone ecu's for nissan auto

So the best bet would be a piggyback system or similar? most places ive spoken to have changed the subject fairly quickly when it comes to the ecu, which is why i thought id post here. and they all had different ideas of what i should do first, which is what im after.

Say someone said "heres $5000 to spend on your engine". what would you do to it?

_8OO5TED_ Mentor

_8OO5TED_

Posted
Posted (edited)

turbo back exhaust $800

generic intercooler kit $450

cai set up $300?!

bosch/walbro fuel pump $250

SAFCII/S-ITC $500

DBA slotted rotors $400

GCG Hiflow/2nd hnd HKS turbo (low mount, ie GT2535) $1500

turbo timer $100

EBC $400

Thats $4700, then add tuning on top of that, $2-300 maybe?!

thats a quick list, hope it helps.

Edited by _8OO5TED_
paulr33 Grand Master

paulr33

Posted
Posted

the problem is that auto gear logic is in the main nissan ecu and all stand alone engine management systems for nissan are manual, so it will be harsh the auto box. you need a piggyback system

qikstagea Mentor

qikstagea

Posted
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I think the lack of Power FC for nissan autos is simply cos there isnt a big enough market. Most people modify manual vehicles. They may be thinking they wouldnt sell enough to be worth the research and developement? Ive read in the stagea forum that there may be something in the works, but i assume it would come at a premium.

What is a good piggyback system to use? GReddy e-manage or something? computers are one of many things in my "not my strong point" category...

mad082 Grand Master

mad082

Posted
Posted

ok, well if you go the BOS dump and cat, then a cat back 3" system you are looking at about $1000-$1500 for that.

then $400 for a cheap cooler.

anywere from about $1000-$2000 for a turbo.

for the ecu you have a few options. they all work out to be about the same money. they are a greddy emanage ultimate, pfc or safc2/sitc combo. for any piggy system you'd really want a remapped ecu to base it on so that you don't have rich and retard mode. that setup will give you the best driveability as it should be close to the standard gear change (unless it was altered in the remap). then using the safc2 you can alter the amount of fuel going in, and run a z32 afm.

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