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December 18, 2018, 01:35:32 PM
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Author Topic: Aftermarket Turbos  (Read 3841 times)

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Offline evoWiPeR

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Aftermarket Turbos
« on: November 19, 2003, 01:10:14 PM »
Anyone heard of somone putting a bigger turbo on the WRX at all. i wanna see what it looks like and see if its as god as they say it is. i was looking into the vf-24 turbo, but then i desided that a vf-35 turbo even tough expencive it might be Worth the POWER!!

let me knwo if u guys seen any around
'03 WRB WRX        
'05 Sky Blue Legacy

Offline Trailboss

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Aftermarket Turbos
« Reply #1 on: November 19, 2003, 03:39:07 PM »
Depends what turbo you are looking for.  The VF-35 isn't going to give you a lot of top end power, like the VF-34 or VF-22 will.  However, the VF-35 does act very similarly to the stock turbo. You get a very quick spool up around 3,000 rpms, unlike the other top end turbos that pull at 4,000.  It's a very good turbo for doing things like auto'xing and short sprint drives.  However, on the highway, you might want to think about something else.
"I dont think he knows how to give up. His mind and machine are racing as one." - Takahashi Ryosuke

Offline Timdog1650

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Aftermarket Turbos
« Reply #2 on: November 19, 2003, 05:48:44 PM »
The whole debate over what kind of turbo to upgrade to is a pretty common one, but easily solved if you have a good set of ideas in mind.  There is a turbo for just about every tuning application out there, and based on your price bracket you could end up with any number of different models with different specifications.  Like Josh said above, the VF 30/34 models are great top end turbos that come to full boost a little bit later than the stock model.  This has a lot to do with the size of the compressor and exhaust housing sizes.  The larger the turbo, the more lag, etc.

Good Midrange turbo = VF 23
Good Top end turbo = VF 30/34 (the only difference is that the 34 is ball bearing)

There are of course hundreds of other brands than the IHI VF series, but those are the most commonly used.  The APS SR series turbos are amazing as well, but significantly more expensive and much more lag than stock.  Another question to ask is if you want to run a FMIC or an aftermarket TMIC.  With a FMIC, you can see up to a 3 psi decrease in boost accross the entire system, accompanied by a large amount of lag (depending on FMIC).  The advantage of a FMIC though is the ability to run higher boost numbers because of increased cooling capacity.  A TMIC would have much much better boost response than a FMIC as well as very little loss in pressure, but can suffer from heat soak from the exhaust side of the turbo.  Addequate heat shielding/water sprayers are necessary for max. efficiency with a TMIC.

For further information on turbo charger size/specs, see  and read their descriptions.

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Offline MauroMotorsports

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Aftermarket Turbos
« Reply #3 on: November 24, 2003, 04:27:21 PM »
Upgrading the turbo on the WRX isn't very cheap that's for sure. The turbo itself can be found for a good price, however, you will certainly need fuel injectors, an upgraded fuel pump, and some sort of engine management.

Simply installing a larger turbo on a stock WRX will not yield good results. You will have to do some tuning in order to keep your cylinders from leaning out. The stock WRX fuel system and computer cannot handle the upgraded CFM's a bigger turbo puts out.

Timdog is correct, there are many different types of turbos out there, but there really isn't a single turbo upgrade that can be installed without upgrading your fuel system or your engine management.

Another thing is that lag can always be cured, but not fully on the WRX. Any IHI or other turbo can be ported and polished to reduce lag. Not to mention engine management along with a good boost controller too.

Just thought I'd give some insight.
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