mattwrxCS

iTrader: (1)

Hi all,

Whats the difference between the VF35 and the VF29? and what power levels can be expected?

I have the 29 on my RA as standard and have a 35 on the way, i was wondering if it will be any different?

mattwrxCS

iTrader: (1)

Anyone?

Pete

Matt, i have the VF34 on my TYPE-R and it made 347bhp/346lbft but it,s not far off it,s limits tbh mate, i think the 35 makes similar maybe a tad more but might have different spooling qualites

mattwrxCS

iTrader: (1)

Thanks Pete,

If the VF29 and VF35 both peak at 350bhp ish, then i'll just fit the VF35 later on if the 29 goes pop.

Stevesbluewrx

iTrader: (4)

Would the 35 not be a over kill with the RA short gearing? I guess it depends on the driver but my 35 worked very well on my 2002 STi with the 6 speed box.

I could be wrong again.

Steve

Pete

Steve,

Just slightly off topic of 29/35 turbos

I think the 34 makes a great turbo tbh, i,ve been in a RA with this unit fitted and it was superb, my box is also very close ratio and the acceleration to 100 is frantic, i think it,s hitting 100 in around 10secs, well it did a quarter mile @ 12.2 @ 110 terminal so not shy

Stevesbluewrx

iTrader: (4)

Pete,

Not off topic at all matey.

I understand the 34 and 35 are almost like for like. The 34 would/is slightly better than a 35 . I guess its how the driver uses it I guess but on a RA a 18g would be better over a VF if you was not to go VF route (off topic I know).

In this case would a 22 not be better suited for mattwrxcs?

Steve

Pete

Steve,

Yes a 22 is a good option too, i liked the 29 aswell on my old RA tbh, but i,m with you too about how it,s driven etc.

An 18g on an RA would be fun to say the least..

banny sti

iTrader: (68)

This should help

IHI Turbos

VF22
This turbo has the highest output potential of all of the IHI VF series turbos and is the best choice for those who are looking for loads of top end power. The top end power however, does not come without a cost. The VF22 spools significantly slower than the rest of the IHI models due to the larger P20 exhaust housing and is much less suited for daily driving than some of the other models. Although the largest VF series turbo, the VF22 is not quite optimal for stroked engines or those who wish to run more than 20PSI of boost.

VF23
This turbo is considered a great all-around turbo. Like the VF22 it utilizes the largest P20 exhaust housing. This housing is mated with a smaller compressor housing of the of the VF24. This turbo is considered optimal in applications with range from mild to slightly wild. It does not have the same top end power of the VF22, but spools up significantly quicker.

VF24
This turbo shares its compressor housing with the VF23 however, this housing is mated with a smaller (P18) exhaust side. The smaller characteristics of this turbo allow it to provide ample bottom end power and quick spool. This turbo is very popular for Imprezas with automatic transmissions and Group N rally cars.

VF28
This turbo came standard on the STi Version 5. In terms of overall size, it is smaller than the VF22, VF30 and VF34, and about same size as the VF23.

VF29
This Turbo is nearly identical to the VF24, with the same compressor and exhaust housings. However the compressor wheel in the VF29 is has been changed slightly. The changes made to the compressor wheel in this model are generally viewed as improvements, and as such this unit is typically chosen over the VF24.

VF30
The VF30 is commonly considered the best bang for the buck turbo in the IHI VF series line. A relatively new model the VF30 features the same exhaust housing as the VF24 but a larger compressor side similar to the VF22. The combination of these two parts results in increased output potential without the lag associated with the VF22. Although it doesn't offer the top end supremacy of the VF22, the VF30 is a great compromise between these unit and the quicker spooling models.

VF34
The VF34 is nearly identical to the VF30, with the same exhaust housing and compressor. However the VF34 goes back to the ball bearing design, and in doing so achieves full boost approximately 500RPM sooner than the comparable VF30. The VF34 is the most recent IHI design and as such costs slightly more than its counterpart. Top end performance and maximum output are identical to the 30.

VF35
VF35 The VF35 has identical internals as the VF30 and it uses divided thrust bearings. However, the exhaust housing is a P15 which means this turbo will have fantastic spool characteristics. This turbo is standard on the new WRX Type RA. LIMITED SUPPLY.

VF36
Roller bearing version of the twin scroll VF37, also has a titanium turbine and shaft for even quicker spool. Same compressor housing as VF30/34, however twin scroll P25 exhaust housing provides slightly better top end output due to reduced exhaust pulse interference. This turbo is good for 400HP and used on JDM STI Spec C from 2003 onwards.

VF37 (thrust bearing)
Enter the age of twin scroll IHI turbos. Same compressor housing as VF30/34, however has a new twin scroll P25 exhaust housing that provides slightly better top end output due to reduced exhaust pulse interference. Twin scroll also provides better spool up for improved low down response over the VF30/34. This turbo is good for 400HP and used on JDM STI from 2003 onwards.

VF38
Twin scroll turbo with titanium turbine and shaft. Smaller compressor housing than VF36/VF37 provides tremendous spool up capabilities but less top end than VF36/37. The spool capabilities of this turbo are demonstrated on the JDM Legacy GT, which reaches peak torque at 2400RPM.

VF39
Single scroll turbo used on USDM STI and latest 2.5L STIs released internationally. Smaller than VF30/VF34.

VF42
Exclusive turbo to the S203/S204 models, this features a twin scroll design with a slightly larger compressor than the VF36/37 turbos and different turbine design (more blades). The VF42 is a roller-bearing turbo and is likely of similar size to the VF22 turbo, but with twin scroll exhaust housing for faster spool and superior top end performance due to reduced exhaust pulse interference.

Banny

mattwrxCS

iTrader: (1)

Cheers for the input guys, the VF22 or 18g are not really an option as i have 2 turbo's already,

The 29 is on currently, i'm trying to find out if there will be any advantage of fitting the 35?

Thanks, Matt.

Stevesbluewrx

iTrader: (4)

I think your need someone who has done this mate to add input? Or even a mapper like the legend JGM .

Or you could sell both the 29 and 35 for a 18g or 22. lol Only kidding.

Steve

webby v7 slipperwagon

iTrader: (2)

So what could you expect out of a mapped vf35

99greenwagon

iTrader: (39)

vf35 should be mappable upto around 350 bhp with supporting mods

Pete

^^^^ Like he says...... similar to my 34.

mattwrxCS

iTrader: (1)

If the VF29 can make the same power, then i'll stick with it for now.

Pete

Matt, stay with the 29 mate, it,s a nice turbo imo....

IainMilford

iTrader: (15)

my vf35 makes 347/343

Tidgy

that posted info is a bit inacurate. the new age sti's up to hawkeye had the 35, the 34 was on the ra's iirc

sppol on the 35 and 34 are about the same, top end on the 34 is about 10-20bhp more. cost wise £200 - £300 more for the vf34

AndrewC

Matt has already asked the guy who fitted his Simtek.

VF22 has no place on a 2.0 Subaru engine, VF34 or 18G will blow it away...

mattwrxCS

iTrader: (1)

Yeah, Thanks Andrew

The 29 is staying on.