Andy-C

Hi all,

Thinking about upgrading from TD04, but I am confused as to what I should do next. I have a MY98 wagon.

I was thinking of a TD05 as a natural progression, however someone mentioned the VF series, which I don't really know much about.

Ideally I would like faster acceleration over top end, so that would be something to consider.

I would be looking to change the turbo at the same time as a remap.

I don't want to be phoning Zak or Knowlsey up wasting their time at the moment, as this is in the thinking stage, so all help/ advice would be appreciated.


PS - don't let -C`chelle see this - she doesn't know about my plans -yet

StiX

iTrader: (4)

I have been considering this for some time, I have a remapped TD04 producing 273/273, but would love to go over the 'magic' 300 without losing too much low down boost.

I have also been considering TD05, I had one on my old WRX and it spooled up pretty quickly with a full decat.

However, the TD05 can be brutal on the gearbox I have heard if mapped to its full potential with supporting mods.

The VFs are highly rated also, and I have been thinking about VF28 (P1/STi 5 turbo) which spools up quickly and is good for about 320bhp or VF34/35.

Anyway have a look here:



'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'

alloy

i have a vf35 for sale...

Supercue

iTrader: (1)

No good without a price

Granby

iTrader: (5)

Depends on what TD05 & would you be doing any other mods

TD05 16G / 320-330

TD05 18G / 370-380

TD05 20G / 400 +

StiX

iTrader: (4)

I was under the impression that a standard TD05 16g would go up to 350 - with supporting mods of course?

Granby

iTrader: (5)

Yep you could be right but i've not heard of many that have taken them that far, a bit like the VF34/35 which should also be good for around 350 but most people seem to get around the 330 mark including me

Andy-C

Thanks for the replies everyone, but please keep them coming.

Car is MY98 wagon UK model
Mods so far are:
Green Cotton filter
2.5" H&S decat from turbo back.
Warlbro 255 fuel pump
(4 pots and DBA discs for stopping )

I would like to break the 300bhp barrier running at 1.25 boost max

Supercue - hands off - my thread - lol
Alloy - How much?

Supercue

iTrader: (1)

StiX

iTrader: (4)

In that case if you aren't chasing big numbers I would go VF28 - very fast spool up and relatively cheap too, cheaper than VF34/35, maybe £150-200?

Add an Apexi FC, mapped and fitted for £750 by Andy F or someone else and for a grand you are there, with the mods already fitted. Only thing you may need is a 3-port boost solenoid, for better boost control but they are less than £100 (not sure how much exactly).

320bhp

Your not going to gain boost pressure with a 3 port solonoid, the only way to get 1.25bar is to have a boost controler. If your going to go down the apexi route, then get the apexi boost controller to £250.

essexboy30

iTrader: (1)

You can have a manual boost controler, you don't have to go the apexi route.

StiX

iTrader: (4)

You can, but I would always do it the safest route via a proper remap instead of just whacking up the boost?

I wasn't saying you can raise the boost higher with a 3-port?

It enables more accurate boost control when remapping. When mine was done mapper wasn't able to achieve boost target of 1.25 on my TD04, so installed a 3 port and then had no problems. I have heard the same thing from lots of ofther people on here also.

essexboy30

iTrader: (1)

It enables you to map boost versus RPM, etc.
Manual boost controler will just set a maximum limit.
But again your mapper can set either up for you.
I'm running a manual boost controler, with a little more than 1.25 bar

Milamber

iTrader: (2)

1.25 is for girls

Andy-C

That as maybe, but I won't crack my pistons

Tiny

Where's Frayz ??

This thread is still waiting to be Farayz approved imho

( Sorry but it's unable to be rubber stamped until then )

StiX

iTrader: (4)

Oh, and bigger injectors - forgot about them, your 380s are apparently only good for up to 300bhp, so you'll probably need to upgrade to 440s which are good for up to 350bhp.

Andy-C

440's - are they the yellow ones

wrx_yank

keep in mind, mitsubishi turbos....(TD05-16/18/20G and the like) are rebuildable, IHI turbo's are not....

although i love my VF-39

frayz

iTrader: (7)

Andy,

Call Zak and speak to him.. it wont be a waste of time if youre serious.

I'll reply to this thread later when i have more time.. or catch me down the lodge if you want a chat.

Frayz

Nate

iTrader: (2)

I had Mike's (essexboy30's) 3 month old VF28 fitted last week ....... The difference is incredible, on Zak's laptop he said my 01 WRX gained 310 BHP, and that if we took our combined weights into the equation, the car was pushing Approx 330BHP.




And I still have to get him to fit Frayz's STi pinks yet ...... Which (according to Zak) should release another 15BHP

I am a little bit happy with that


Have to get the geometry and suspension mods now

yellowvanman

Wow Nate, that is some gain, but how did you even drive it before with only 20BHP?

SirFozzalot

Too busy with your R/C stuff eh?

Andy-C

Hi Frayz,

I would appreciate some feedback from you (via PM if you want) before I contact Zak.

Thanks mate

Milamber

iTrader: (2)

That IS impressive

53

iTrader: (41)

Pub numbers

WRX_Dazza

lol, can also go on EA's dreamo machine and get it confirmed

yellowvanman

What were you doing looking a year old threads?

bibo_boy

I had a Type R with a VF22 and now have a RA with a TD05...

TD05 all the way