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vf24 vs vf22 : upgrade


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Hi Guys..

I have a 2001 STb manual.

So i just got my Version6 STI Ra ECU with Yellow injectors today.

And now im just looking for the right turbo.

I heard a vf22 has quite a bit of lag to it..

And i can also get a vf24..

Which one would you reccomend?

I think the vf24 because it has a quicker spool. unless someone can convince me otherwise.

cheers

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Guest itsgotgo

In all honesty the vf28 i had on my 98foz had no lag and pulled clean to 7500rpm

Have heard the other 2 can be a little laggy and the 28 will see 200kw atw.

But others may have a better idea :)

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yeah i was thinking about the vf28.. but im struggling to get my hands on one.

I have found one, but the guy wants 650 for it and it has done more than 160000km..

I can get a vf24 for about 500, but it has done way less kms.. around 90k

they have similar caracteristics the vf28 and 24..

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vf24 and vf28 are near identical - both ball bearing turbos

Same turbine

Same exhaust housing p18

Compressor size is the same.

Make about the same power - 200kw atw+

Similar spool times

VF22 uses a bigger exhaust housing + compressor wheel.

So it will make more power but have more lag

You will need bigger injectors / aftermkt ecu to be able to use the all the power the vf22 can put out

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 Qwerty said:

vf24 and vf28 are near identical - both ball bearing turbos

Same turbine

Same exhaust housing p18

Compressor size is the same.

Make about the same power - 200kw atw+

Similar spool times

VF22 uses a bigger exhaust housing + compressor wheel.

So it will make more power but have more lag

You will need bigger injectors / aftermkt ecu to be able to use the all the power the vf22 can put out

Awesome! i think a vf22 is a bit too much then! ill go for a vf24..

Its not like im gona try and get top end speed anyway..

So the yellow injectors, v6 ra ecu and vf24 should make a good upgrade ;D

thanks for the advice

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so a vf22 will just bolt straight on with no extra mods?

If i get the yellow injectors and sti ecu, will i need to worry about the too much boost?

or will everything be sweet as?

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Yes both will bolt straight on

You can run a vf22 or even bigger turbos on yellows but your power will be limited by your fuelling.

I've seen people put vf22 on wrx's with grey injectors - lol

On yellows you will only safely make about 200kw before you run out of injectors - depending on the dyno.

vf24/vf28 are proven to make about 200kw @ 18psi and run injectors close to 100% duty

The vf24/28 will outspool a vf22 and both make about the same power on yellows.

vf24/28 will have more torque and a much better midrange than a vf22 - so all round a faster car.

Sti's had these turbos for a reason.

If in the future you wish to upgrade injectors / ecu etc and make more power a vf22 should do 230kw ish.

If you just want 200kw odd the vf24/28 is the better option - if you want more power in the future the vf22 is better.

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Guest itsgotgo

Good stuff qwerty,i never had the 24,but the 28 pulled like freak from the start with no lag :)

With a boost tap mine was ok but with a good boost controller it was awesome!!!!!!!!

Also the drive-ability around town was good :)

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sweet as guys! your help is much appreciated.

Well, im gona do the whole thing

Yellows, STI ecu and turbo... just trying to fing the right one.

i dont want to go too much on the boost..

i think standard boost with that ecu will be about 16 psi? is that right?

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the sti setup will do abt 175kw at the wheels with the vf22 - kingpin from here has done the same thing as fasr as mods and thats what he god..

anyway as summed up earlier - depends what u want to get in the end...?

if more pore is ur thuing then the 22 but if u want a good street driven car then the 28.. personally the 28 also is better as it will not tempt u to over boost on the standard cast pistons as they are not too happy to run too much boost for too long..

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 Qwerty said:

Yes both will bolt straight on

You can run a vf22 or even bigger turbos on yellows but your power will be limited by your fuelling.

I've seen people put vf22 on wrx's with grey injectors - lol

On yellows you will only safely make about 200kw before you run out of injectors - depending on the dyno.

vf24/vf28 are proven to make about 200kw @ 18psi and run injectors close to 100% duty

The vf24/28 will outspool a vf22 and both make about the same power on yellows.

vf24/28 will have more torque and a much better midrange than a vf22 - so all round a faster car.

Sti's had these turbos for a reason.

If in the future you wish to upgrade injectors / ecu etc and make more power a vf22 should do 230kw ish.

If you just want 200kw odd the vf24/28 is the better option - if you want more power in the future the vf22 is better.

Put brand new VF22 on my 80K wrx and it pulled like a schoolboy with minutes to live...great turbo.

And if your worried about lag, change down a gear... :P

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i put the vf28 in today with a v5 ecu..

but there is a little bit of a problem

it doesnt boost fully..

it max out at about 7 or 8 psi..

what could it be?

i used my old restricter pill, should i used a restrictor pill that came with that turbo?

or will a boost tap fix it?

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Guest itsgotgo
 BC5RA said:

That's waste gate pressure.

You sure you've connected the vacuum lines correctly?

Mine did the same thing,all lines hooked up correctly.

All i could put it down to was different actuators.

I searched and searched for a line problem and never found one though.

I scratched my head over this for a few days lol :)

I will be something with the change of ecu.?

I think conrad has sorted with a tap for the time being :)

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there is no problem with the exhaust or turbo bolts..

what i did is, i put my old ecu back in, and then it boost 100%, 11 or 12 psi..

the moment i put the sti ecu in, something goes wrong. I think it might be going into safemode.

But i will install a led light to make sure. But ive got a feeling that its the safemode.

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Guest itsgotgo

the sti ecu will not take it to 12psi :)

Dont ask me why but mine was the same. ???

Just use the boost tap or ebc you will be fine.

Mine was far from safe mode with the ebc installed ha ha 8)

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yeah i got a vf22 on my wrx great upgrade aye i didn't have to change my computer or anything but mines nz new so might have something to do with it.

when i put the vf22 in it would only boost 9psi off the wastegate as we had to block off the factory boost solenoid from memory it managed 144kw atw at 9psi peak and 167kw atw on 13.5psi and peak boost but i think i have a leak as my gauge said it was 15psi but dyno said other wise.

i find the vf22 to be very aggressive pushing you back in your seat feeling, you notice the lag compared to the factory TD04H but i'd never swap it for another turbo for bang for your buck.

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yeah, it was a tough decision for me between a vf22 and the vf28..

The reason why i took the vf28 was about the whole lag issue.

but that issue can be sorted by just changing a gear down, like some said before.

Ended up getting a really good condition vf28. And its awesome.

I think you might have a leak yeah.

I bolted in the vf28, with my standard ecu, and its still boosting 11psi. With my old solenoid everything. Just as it always was.

Just check the bolts on your turbo is all properly tightened.

or your gauge might be screwed..

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