dyno results in

[ONRAILS]

He also has a catless down pipe. I got those exact numbers, except I was at 10psi. I have 2.5 cat w/dp, 2.5 pipe to axle (resonator deleted), mbc, fcd, injen.

I still don't see any dyno sheet to disprove my skepticism.

 

[1FASTMSP]

My Subaru friends tell me that the USDM STI injector are side feed as opposed to the WRX's top feed design; so no they will not fit the MSP. Also the STI injectors are 550cc ( from what I have been told ).[/QUOT

Thanks for the info. So whats the right injector? I need 440 or higher I can control the injector from my AEM EMS so I'm not to worried about the size just that it will fit and work properly.

you need stock WRX injectors, they are light blue and top feed and high impedence, they drop straight in with no problem....also, make sure they have not been modified, otherwise they will be running around 800cc

i got a set from ebay for $60, and got my walbro GSS342 fuel pump on ebay for $80...

 

[PHILLY-ORANGE]

Hey thanks for the info.

 

[muohio]

Hasn't one of the MPI Tuner owners proved that a fuel pump isn't necessary with 440cc injectors?

 

[daedalus]

not a big deal, but AT/ 4G63's came with 390cc not 380cc. *Shameless plug* I have a set of 390's for sale that i was going to use on my 4G63 NA project car, but that blew up so if anyone wants em i'm not using them...

 

[1FASTMSP]

Hasn't one of the MPI Tuner owners proved that a fuel pump isn't necessary with 440cc injectors?

i think dean's car is running stock fuel pump, but that is with extra injectors, not bigger injectors, iirc...

 

[boo ya speed]

im in the mountains so its harder for me to get hp plus no fuel thats why i lost so much top end

 

[DSMConvert]

hmmm seems you guys are a little confused on DSM injectors....DSMs came in 3 different engine types...420A(N/A engine) 4G63(Turbos) and the 4G64(2.4L N/A). 420s came with 380cc, 4G63s came with 440cc, and the 4G64 I believe came with the 390s. 510cc injectors were on the jdm galant vr4 models. You can pick up 440s all day for 50 bucks shipped, infact I just sold 2 sets for that. When I built my mx6 FS03 I used 440s from a dsm and they supplied plenty of fuel for my t3/04. 440s will push enough fuel to run 18ish psi on a t25 turbo, but you will have to upgrade the fuel pump on mazdas.

 

[jred321]

auto 1g turbos had 390's and a smaller turbo (13g i think), 1g manual had 450's and the 14b, 2g turbo had 450's regardless of drivetrain but a crappy t25, the 1g 2.0 na (i believe a 4g63 still) ran 240's, the 1.8l a little smaller injector but nobody cared enough to measure them, the 2g na motor (neon motor, 420a) ran 235's. i couldn't find what the 4g64 ran in the 2 minutes it took to search for all of this on dsmtalk. so you can get 4g63 injectors in 3 different sizes in US models of the engine (not counting evo8), and dsm injectors (if you count all 2g's as dsm's) in 6 different sizes

 

[DSMConvert]

hmm wow I wonder how we both got our info off the same site and ended up with different #s? I prob superimposed a # somewhere... at any rate 450s are the only thing worth getting and should supply plenty of fuel...if you're worried about buying used injectors there is a company that will flow chart them and balance them for fairly cheap(means they'll be basically new and have charts with them). If you scroll down the link below there will be an injector chart...The chart is actually for a 2g but will give you a good idea of what fuel mods you will have to do for an MSP. Please note the stock 2g fuel pump flows slightly less than a 190 wally, I'm not sure on the MSP.

http://www.roadraceengineering.com/eclfuel.htm

 

[TurfBurn]

I called roadrace and talked to them directly. They actually just send the injectors to RC Engineering to have the work done, so you can send them directly to them. The cost is 100 bucks for 4 injectors... the process is pretty involved too

http://www.rceng.com/service.htm

I think I'll just do this to my injectors since I already have 8 of the same 550cc injectors.

This is also interseting and important because then I can match all my injectors to be the most consistent for overall flow so that I'm sure each cylinder gets the same amount of fuel per pulse.