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Old 11-17-2008, 08:56 PM   #1
azn0boi04
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Default turbo upgrade without standalone ecu ?

i have a 94 wrx, td05 turbo.. and stock ECU. (U8)
my turbo is going bad and i want to upgrade a little bit.

or that possible on a stock ECU, or do i just have to replace the turbo with another TD05

what is the biggest turbo i can get without tuning?

i heard the VF22 can go on my car without tuning. is that right?
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Old 11-17-2008, 09:11 PM   #2
Matt Monson
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Any of the STi variant factory VF series turbos would be an acceptable replacement. However I wouldn't really call any of them other much of an upgrade. But to really upgrade (like to an 18G) you need bigger injectors, bigger intercooler and new EM.
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Old 11-17-2008, 09:14 PM   #3
azn0boi04
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o cool.. i thought i had to tune my car if i got an STI turbo..
why dont u think any of those are an upgrade from a td05.

i dont wanna upgrade Too much, because i dont want to get a new EM, yet...
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Old 11-17-2008, 09:51 PM   #4
suberdave
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any turbo will work, the ECU dose not know what turbo is on the car. you do not have to tune for a turbo.

what you have to tune for is higher boost...

if you run a TDO5 at 12 PSI it is the same as runing a GT40 at 12 PSI. but most people have to tune due to the fact that people run different turbos for higher boost, and earlier spool.

if this statement is wrong someone correct me...

-=Suberdave=-
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Old 11-17-2008, 10:28 PM   #5
azn0boi04
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what would be the best turbo to put on my car?
VF___?

not sure if i want low end power or high end power...

i will be running about 17 psi boost...
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Old 11-17-2008, 10:57 PM   #6
suberdave
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for 17 PSI you will most deffantly need larger injectors, bigger intercooler and some serious EM...

to run any front entry "VF" turbo you will need a EJ20K intake or rotated or some different turbo config.

-=Suberdave=-
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Old 11-17-2008, 11:32 PM   #7
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Quote:
Originally Posted by suberdave View Post
for 17 PSI you will most deffantly need larger injectors, bigger intercooler and some serious EM...

to run any front entry "VF" turbo you will need a EJ20K intake or rotated or some different turbo config.

-=Suberdave=-
not true. you can run a 90inlet pipe.
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Old 11-17-2008, 11:35 PM   #8
azn0boi04
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Quote:
Originally Posted by supasweetr34skyline View Post
not true. you can run a 90inlet pipe.
i can? wow my options are just bouncing back and forth..

but i would have to get another intercooler.. cuz my slanty is said to handle only 18 psi or something like that... and 17 is right next to 18.. haha
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Old 11-17-2008, 11:46 PM   #9
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deadbolt will change the housing over to the 90 degree inlet for cheap. good call kevin.
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Old 11-18-2008, 12:00 AM   #10
suberdave
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Quote:
Originally Posted by supasweetr34skyline View Post
not true. you can run a 90inlet pipe.

something like this may be an option...



http://www.optionimports.com/90demotituel1.html
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Old 11-18-2008, 12:13 AM   #11
azn0boi04
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hahah that looks easy to make.. with some 3 inch tube and a heat gun.... but if something like that will work, then ill have to look into it...
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Old 11-18-2008, 12:16 AM   #12
gc8awdsti
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wow suberdave that peice is nice. seriously i tried to make a 90 degree one time and it was boost leak from hell.lol

im about to buy that peice right now..lol thanks man.
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Old 11-18-2008, 01:48 AM   #13
Super Nintendo
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Quote:
Originally Posted by suberdave View Post
any turbo will work, the ECU dose not know what turbo is on the car. you do not have to tune for a turbo.

what you have to tune for is higher boost...

if you run a TDO5 at 12 PSI it is the same as runing a GT40 at 12 PSI. but most people have to tune due to the fact that people run different turbos for higher boost, and earlier spool.

if this statement is wrong someone correct me...

-=Suberdave=-
That's actually wrong. Bigger turbos move more CFM at the same PSI.

-Ty
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Old 11-18-2008, 09:55 AM   #14
Matt Monson
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Quote:
Originally Posted by azn0boi04 View Post
o cool.. i thought i had to tune my car if i got an STI turbo..
why dont u think any of those are an upgrade from a td05.

i dont wanna upgrade Too much, because i dont want to get a new EM, yet...
Here's a start for you:
http://www.mrtrally.com.au/performan...turbo-data.pdf

A vf22, which has a very similar sized exhaust wheel to the Td05 that's currently in your car puts out about 450cfm at 1 bar of boost. The Td05 will put out 505cfm at the same pressure. And that's the biggest of those VF series turbos that were found on factory STi's (in reality, the VF22 was found stock on v3&v4 5MT sedans and were an option on the v3&4 STi's). All the others are smaller. The only one I know nothing about is our current vf39 USDM STi turbo. I am sure a quick search will give you some flow numbers or someone else will add in the answers here.

At higher pressures, the vf22 has been shown to outflow the Td05 by about 5 or at most 10% as you approach something like 1.2 bar. But as others have said if you want to push that kind of pressure you will need injectors.
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