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turbo question
- Thread starter woof
- Start date
southwalesgt
Member +
Heres some info for you bud
The MY98 model WRX JDM version comes with the VF22 turbo
The MY98 model STi4 JDM version comes with the VF24 turbo
The newer MY2000 P1 and STi6 UK and JDM versions come with the VF28 turbo
The base turbo is a Mitsubishi TD04. Originally, when the WRX first debut in 94, the WRX came with a larger Mitsubishi TD05 turbo. The larger turbo allowed for greater top end horsepower at the expense of turbo lag and initial spool up. Thus, starting in 97 Subaru replaced the TD05 in favor of the smaller and quicker spooling TD04.
So…where to begin and what type of turbo to install? Well, for starters, look to Subaru's own in house performance tuning division - STi. The 280 hp WRX STi V7 sports an IHI VF24 roller ball bearing turbo.
Roller bearing turbos give you fast transient spool up - full boost comes on quickly.
The VF series (VF22, VF23, VF24, VF29, VF30, VF34, VF39) are the most common direct replacement turbos. All VF-series turbochargers use the same roller bearing, water-cooled core assembly. The differences are in their wheels and housings to achieve different flows.
The VF22 has the largest potential for peak horsepower. In other words, in the IHI model range, the VF 22 supports the highest boost levels. It is capable of running up to 25 psi. Because it is a roller bearing turbo, turbo lag is minimal...the boost comes on around 3300 rpm. Expect to max out the VF22 somewhere in the 400-450 hp range.
The VF23 starts the middle ground. It comes on boost around 3100 rpm and is capable of running 20 psi of boost. Expect to max out the VF23 somewhere in the 300-350 hp range.
The VF 24 starts to come on around 2900 rpm and will significantly improve power through the midrange over the stock TD04 turbo. However, the VF 24 is only capable of running around 17 psi.
The VF23 and VF 24 are a great replacement for those who value drivability higher than maximum power.
The VF29 & VF30 delivers a very wide increase in torque over the standard TD-series turbos.
The VF 30 is a fairly new IHI model that utilizes the exhaust housing of a VF24 and the compressor housing sized between a VF 23 and a VF 22. It comes on boost down low (around the 3000 rpm range). With upgraded injectors, fuel pump, and engine management, the VF 30 is good for 365-390 horsepower. It is important to note that the VF30 is NOT a roller bearing turbo.
The IHI VF34 (which comes standard in the Japanese market STi version "RA") is a new roller bearing turbo. It has the same specifications (compressor size, etc.) as the VF 30. The difference lies in the roller bearing which, theoretically, allows quicker spool and better response. It costs a couple hundres more than a VF 30. The VF 34 maxes out around 365-390 hp. It is probably the most popular option for big turbos on the WRX.
One other turbo to note is the VF 39...it comes standard in the USDM STi. These are a new roller bearing, TWIN SCROLL design. Performance numbers are pretty similar to the VF34
http://www.mrtrally.com.au/performance/docs/turbo-data.pdf
The MY98 model WRX JDM version comes with the VF22 turbo
The MY98 model STi4 JDM version comes with the VF24 turbo
The newer MY2000 P1 and STi6 UK and JDM versions come with the VF28 turbo
The base turbo is a Mitsubishi TD04. Originally, when the WRX first debut in 94, the WRX came with a larger Mitsubishi TD05 turbo. The larger turbo allowed for greater top end horsepower at the expense of turbo lag and initial spool up. Thus, starting in 97 Subaru replaced the TD05 in favor of the smaller and quicker spooling TD04.
So…where to begin and what type of turbo to install? Well, for starters, look to Subaru's own in house performance tuning division - STi. The 280 hp WRX STi V7 sports an IHI VF24 roller ball bearing turbo.
Roller bearing turbos give you fast transient spool up - full boost comes on quickly.
The VF series (VF22, VF23, VF24, VF29, VF30, VF34, VF39) are the most common direct replacement turbos. All VF-series turbochargers use the same roller bearing, water-cooled core assembly. The differences are in their wheels and housings to achieve different flows.
The VF22 has the largest potential for peak horsepower. In other words, in the IHI model range, the VF 22 supports the highest boost levels. It is capable of running up to 25 psi. Because it is a roller bearing turbo, turbo lag is minimal...the boost comes on around 3300 rpm. Expect to max out the VF22 somewhere in the 400-450 hp range.
The VF23 starts the middle ground. It comes on boost around 3100 rpm and is capable of running 20 psi of boost. Expect to max out the VF23 somewhere in the 300-350 hp range.
The VF 24 starts to come on around 2900 rpm and will significantly improve power through the midrange over the stock TD04 turbo. However, the VF 24 is only capable of running around 17 psi.
The VF23 and VF 24 are a great replacement for those who value drivability higher than maximum power.
The VF29 & VF30 delivers a very wide increase in torque over the standard TD-series turbos.
The VF 30 is a fairly new IHI model that utilizes the exhaust housing of a VF24 and the compressor housing sized between a VF 23 and a VF 22. It comes on boost down low (around the 3000 rpm range). With upgraded injectors, fuel pump, and engine management, the VF 30 is good for 365-390 horsepower. It is important to note that the VF30 is NOT a roller bearing turbo.
The IHI VF34 (which comes standard in the Japanese market STi version "RA") is a new roller bearing turbo. It has the same specifications (compressor size, etc.) as the VF 30. The difference lies in the roller bearing which, theoretically, allows quicker spool and better response. It costs a couple hundres more than a VF 30. The VF 34 maxes out around 365-390 hp. It is probably the most popular option for big turbos on the WRX.
One other turbo to note is the VF 39...it comes standard in the USDM STi. These are a new roller bearing, TWIN SCROLL design. Performance numbers are pretty similar to the VF34
http://www.mrtrally.com.au/performance/docs/turbo-data.pdf