guys,

can give advise whether the engine will detonate/lean/ping/break, if i were to replace the stock turbo to VF30 or VF24, without any EM and without upgrade fuel pump and injectors??

thks

I am going to try to pretend you are not even asking this question, but think about it.
The upgraded turbo will add more air to the combustion chamber with out any extra fuel. So you will be running your engine super lean, and then the engine will blow up if you will.
Does this anwser your question.

If you want your car to run on a regular basis, use your head!

 

:tease:

 

Here is a good guide for modding
http://www.wrxtuners.com/forums/showthread.php?s=&threadid=4007

It would be a bad idea to upgrade the turbo without EM and fuel upgrades
Also, even if you upgrade the turbo WITH supporting mods, I wouldn't do so unless you upgraded to a catless uppipe.

 

If you havent tried it and check the data logs I wouldnt say its not possible. I did the following upgrades with no problems what so ever. GTSpec Headers, GTSpec Uppipe, Fujitsubo Catback Exhaust RM01A, Invidia Downpipe, VF39, Forge Intercooler hose, Pony Express MIL Fix and a resistor for the EGT. Again I work at a Subaru dealership and the techs there are highly skilled. We even hooked up the Select Monitor(subaru scanner) and drove a few runs to make sure nothing is wrong. Car runs great and I plan to get ECUtek, modify my injectors, get a fuel pump, Electronic boost controller, and so defi gauges. My boss there says its even ok to run 16lbs of boost without engine management. ECU will compensate for the extra air unless you start messing with how many pounds your running. Mines running stock boost pressure.

 

!Laugh! not juz im using my head but using facts as well, one of my fren has got a vf24 dropped into his stock engine wif stock fuel pump and injectors for over a year (hes got turboback exos done and sti TMIC done), well, he data logged his engine and everyting's running fine, healthy engine, its only recently he got his ride modded further by adding a bigger turbo thus he upgraded his fuel n injectors and ecutek...

im definately using my head, coz i have some doubts on this dats y i post here to ask whether can it be done without harming my engine, if not i could have saved the trouble of asking and go straight to change the a bigger turbo..dude. ity:

 

p.s my fren drives his ride on daily basis.... well, any comments? :tease:

 

I drive mine on a daily basis too.... 60 miles a day. No problems what so ever.

 

How much boost did he run with before the new fuel equip.?

 

p.s my fren drives his ride on daily basis.... well, any comments? :tease:

Your friend is making a huge mistake. As will you if you put a bigger turbo on a stock car.

Best Auto Insurance | Auto Protection Today | FREE Trade-In Quote

 

Your friend is making a huge mistake. As will you if you put a bigger turbo on a stock car.

hi cosmo, it seems in here alot of guys advise is NOT to do it, but from where i come from, some of em insist could be done plus without raising the boost... ok, i have a question, does the higher grade (RON) fuel changes the possibility of able to upgrade the turbo on stock car? down at my wrx city, RON98 is everywhere, is this the cause ??

 

:tease:

 

hi cosmo, it seems in here alot of guys advise is NOT to do it, but from where i come from, some of em insist could be done plus without raising the boost... ok, i have a question, does the higher grade (RON) fuel changes the possibility of able to upgrade the turbo on stock car? down at my wrx city, RON98 is everywhere, is this the cause ??

Higher octane fuel protects against knocks, so theoretically you can get away with running more boost on stock engine management. But, why subject your car to that? Sure, it's possible to put a bigger turbo on a stock car and not have engine problems. It's also possible to fall out of an airplane and not get hurt, but why chance it?

Best Auto Insurance | Auto Protection Today | FREE Trade-In Quote

 

I know of...

I know of a guy who put a bigger turbo and STi injectors on '03 wrx... and he had TONS of problems with the car. It was running lean. But recently he got an EM (UTEC I believe), and it's running pretty strong now. Of course, don't know how well it will do in the long run

 

you could probably get away with doing that but why would you try? I would actually reccomend that you get a UTEC/accesport FIRST-you can get a lot more out of the stock setup with just tuning VS running a potentially dangerous setup untuned.

 

you could probably get away with doing that but why would you try? I would actually reccomend that you get a UTEC/accesport FIRST-you can get a lot more out of the stock setup with just tuning VS running a potentially dangerous setup untuned.

That's my question too. Why??? Wouldn't a bigger turbo, without doing EM or anything else, just mean more turbo lag? If it's part of building a bigger/better package, why not assemble it and do it all at once? Very

 

Just wait to install the bigger turbo, I have a super 16g setting in my closet until I get fuel upgrades.

 

That's my question too. Why??? Wouldn't a bigger turbo, without doing EM or anything else, just mean more turbo lag? If it's part of building a bigger/better package, why not assemble it and do it all at once? Very

No. A bigger turbo means more air. More air without engine management means much leaner AFR's.

Best Auto Insurance | Auto Protection Today | FREE Trade-In Quote

 

okay everyone has to realize that we drive JAPANESE cars meaning every car run completly different. Your friend may have a bigger turbo in his car with no EM or fuel upgrades and the car runs fine. Congradz to him i wish him the best of luck. But if you did the same thing to your car you could have completly different results. If you have the same that great you pick up a whopping, umm i dunno what you guys think 11whp if your lucky. Bro your more then welcome to try it and please with all seriousness tell us how it works out for you.

 

No. A bigger turbo means more air. More air without engine management means much leaner AFR's.

!Thumbs Up

And leaner AFR's mean........

Basicly you'd be doing all that work for nothing. The OFF chance that it may work really means it ain't worth it.

 

No. A bigger turbo means more air. More air without engine management means much leaner AFR's.

Yeah, that I understand. But I thought he said something about not trying to raise the boost (post #11). Maybe I didn't understand what he was saying, but that's why I didn't understand what he was trying to accomplish. If you're not trying to raise the boost and you slap on a bigger turbo, aren't you just increasing the lag effect... for no gain?

I'm not criticizing this fellow. I just haven't figured out what he's trying to accomplish by changing the turbo. Cosworth is looking at going to a twin turbo setup in 07 for their Champ Car engine. They may or may not shoot for more boost and horsepower, but they hope to decrease lag and package it easier. But there will be a new Pi ECU to match the new setup. So avoiding EM settings and making a major change seems a little hinky to me.

Like I said, maybe I just didn't understand what he was saying.