the car was tuned by GST.at that time it had a no name sri and a full TBE w/2 cats.i drove it like that for a while knowing i wanted a bigger turbo.so along the way i have added the following
titek cattless DP
nur spec cbe
walboro 255
GMS inlet and afta maf
cobb sri w/air box
css tmic

now i have a few choices.get it retuned and hope it makes more power(thats worth 400 it costs to tune),add in a set of 650cc injectors and tune or just wait for the turbo and do it them.im just wondering if it will make more power with the current parts(power i will feel)or if bigger injectors on the stock turbo would be beneficial.
any and all suggestions please.

 

you need a new tune and some sti pinks!

 

pinks flow 550 were 06 sti yellows flow 560.

 

injectors wont make any difference in power, unless your fuel system is maxed out in which bigger injectors will allow you to add more power. But you your stock injectors should be just fine running those mods and not a bigger turbo.

getting a tune on those new parts will give you power as you have a more free flowing system now, how much and if its worth the 400 tune is up to you.

if you are going to add a bigger turbo then get it tuned all once. Dont waste money getting multiple tunes, if money is an issue wait...because in the end doing it all at once and doing it right will save you money down the line.

 

it just got much harder with twins on the way.i have the money sitting here for the turbo and i already have the injectors.i just dont like waiting.then again i was lucky to be able to do more to my car in 2 months than most can do in a year.

 

get it tuned.. driving around with mods that your car is not tuned for can end up disastrous. the 400 is worth the saving of the motor... $2500 from Subaru lol.

 

that was my thoughts as well but being as i didnt add fuel or boost it shouldnt hurt it.i changed one sri for another.the only main thing would be the cobb airbox.
am i wrong

 

Get a hallman RX Pro, slap DW 650 Injectors on it, and go in for a pump and race gas tune, and call it a day.
The vf39 is a TQ turbo as is on higher octane.

 

well i talked with the wife and ed.he can tune stock turbo w/740cc easily.so im going to do that and when it comes time to install the turbo ill be able to get it tuned the same day

 

do you have a bigger top mount now then from the prev tune??

 

yes,bigger tmic.also i guess i should mention it has a larger uppipe and a tomei UEL header

 

ya, if you changed to aftermarket headers, changed the TMIC and the fuel pump, you need a tune

 

i would just take mods off and wait for the turbo to arive.

 

I gained 20WHP from swapping the Cobb catted DP to the Cobb race DP. Tune done by GST.

Any significant change in exhaust backpressure (turbo -> back) warrants a retune IMHO.

 

Wow! 20whp? I'm putting a catless Titek on tomorrow morning to replace my catted Titek (which will be for sale) but I'm expecting much less than that and not going to get re-tuned. Was the downpipe all that was tuned for?