1999 RS-T+10PSI+WRX Injector

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Oct 7, 2003 | 10:03 AM

JSTTURBO

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1999 RS-T+10PSI+WRX Injector

Question for you guys who run 10psi and more of boost on WRX injector.

I have this setup on mi RS-T:

Lachute 2,5 Turbo/Back Exhaust
Borla Headers
Zero Sport Radiator Wind Deflector
Halley HP Fuel Pump (650 hp)
Cobb Tuning Cams
HKS Super Mege Flow Air Filter
HKS Intack
Go Fast Bits Blow Of Valves
ASR 2.25'' Up-Pipe
ASR 2.25'' Down-Pipe
WRX Custom Intercooler
Turbonetics (T3/T4 Garette) Turbo (SET AT 8.5PSI)
Turbonetics Delta Gate Wastgate
Bell Engineering Group inc. Rising Rate Fuel Pressure Riser
B&N Oil Engine Cooler
Unorthodox Racing Full Pulley Kit
APEX'i S-AFC
Split Second TMC1 (timing controler)
WRX 420cc Injector (not install for now)
Turbonetics MBC (set at 8.5PSI)

-For those who run 10psi and more, on 420cc WRX injector do you still using RRFPR???

-For those who run 10psi and more, on 420cc WRX injector and using APEX,i S-AFC, what kind of setup are you using??? What it look like???

-What I really want to know is, can I up my boost from 8.5psi to 10psi with my actual setup and by installing my 420cc WRX injector and kiping my stock internal engine???

-Do you think I will still safe at 10psi whit a good tuning setup???

Oct 8, 2003 | 07:21 PM

Kevin M

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From: Reno, NV

Car Info: 1993/2000/2001 GF4 mostly red

I would go straight to STi injectors or even PE650s if I were you. That's a large turbo for the WRX injectors. We don't even recommend a VF30 on stock injectors.

Oct 9, 2003 | 03:22 AM

NOS25RS

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I used to boost up to 8.7psi with stock injectors, RRFPR and forged internals, but the S-afc set-up was +50% all the way up after 3500rpm. This set-up was still running lean, so I upgraded the 550c.c injectors with fuel rails and a EMS. FYI: I blew my #3 piston with 11.6psi with stock internal, stock injectors, stock ECU.

Oct 12, 2003 | 07:31 PM

Weird Styles

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11psi can blow the stock internals on these motors?!

Mind you I am coming from a Nissan, still in it actually, which you can hit 11psi steady on stock internals. Actually the stock KA24DE motor can see 350HP on stock internals....

wow

Oct 12, 2003 | 10:26 PM

Kevin M

Registered User

iTrader: (12)

Joined: Nov 2002

Posts: 18,369

From: Reno, NV

Car Info: 1993/2000/2001 GF4 mostly red

It has a lot more to do with running too lean than it does with the actual power levels. You can make TONS of power on a Subaru engine with sufficient fuel and ignition capabilites. Even leaning out a stock-power WRX can blow it up.

Also, JST, I noticed you have a 2.25" up and downpipe. I would switch to a 45mm uppipe diameter, and 3" turboback. You will notice a lot more power and response with that setup.

Oct 13, 2003 | 10:36 AM

ImprezaRSX

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Posts: 1,821

From: Washington

Car Info: 93 BG5, 00&01 GM6, 06LGT, 07STi

Quote:

Originally posted by Weird Styles
11psi can blow the stock internals on these motors?!

Actually the stock KA24DE motor can see 350HP on stock internals....

wow

A stock 2.5 RS can hit 350HP on stock internals too. THat's about the limit, but you have to be running enough fuel and proper timing retard. >350HP you have to worry about the rods or the rings giving out. However, if you run lean at only 280HP you have to worry about the pistons taking a big dump in your lap. IT's all about Combustion Chamber heat management.

Oct 24, 2003 | 11:59 AM

Jon@Z1

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Our old project 99RS used to run 19 psi for nearly 20K miles on stock injectors and a T3/T4 and he key to that much boost was in timing adjustment...an Apexi ITC let us taper timing off once boost came in and the revs climbed. Eventually though the motor snapped a rod but upon disassembly there were no signs of detonation...the pistons weren't chipped or pitted and had a nice uniform color to them. The rod simply wasn't strong enough for the stress. Once evaluated our engine builder noted that race prepped (coated/shot peened) stock rods would have likely kept the motor intact - so the motors are fairly strong in stock form. 19psi w/a supra TT pump, AFC and ITC (east coast so we had 94 octane at the pump) was seriously quick (STi V5 tranny helped too, teeny gearing hehe).