Upgrade for a VF28 on V5 STI
 

I have done some research and seem to find conflicting advice everwhere I look. :brickwall My car is running at 335 with the above turbo, FMIC, Decat, Walbro, air filter, and a remap by JGM. After 2 years of running this I need more.

I would like to get around 360bhp and improve torque. Mainly for pulling power on motorways as its quick enough around town.

SC billets are too expensive as are the 321's etc.

What about a VF34? 35/43 or 48 as these are considerably cheaper but will they make 360 ish with good torque?

td05 18g and rebuildable

Yes td05 18g/sc38 but would need 550cc or larger injectors to go higher than current power

Cheers Simon, I was looking at the SC range but I just carnt afford it. What would you suggest for my car and aims. They are a bit more modest since we last spoke!

VF34 or TD05 18G?

I've gone for a VF48 on my set up, heard good things about them, good for an easy 350+bhp with supporting mods obviously and above all affordable. mid range and spool up good apparently. I'll let you know once the engine is built and installed :)

Please do mate. Dont want to spend hard earned cash to make my car slower. Hope all goes well

the vf48 is an excellent turbo for a 2.5ltr,but on 2 ltr will fetch about 340/320,but mid range punch is very good and nice and smooth.
so if aiming for a 360+ on a 2ltr i would be looking 18/20g,anything else is very expensive and im not sure that an 18g will pull 360+ on 2ltr?i came to the conclusion that the only way to get 360-400 on a 2ltr would need a 20g.
(without the use of meth obviously).
but just how laggy is the 20g? and whats the difference between a tdo5/6 20g?:wonder:

i dont think a vf34 will make 360+ on v power.
ive seen many results from a vf34 normally fetching 330-340 with similar torque on 2ltr.(again without meth)

"What about a VF34? 35/43 or 48 as these are considerably cheaper but will they make 360 ish with good torque? "

not from what i have seen,they are all similar on a 2ltr and will normally fetch 330-350.with alot less torque than a 2.5 ltr.

I replaced my STi 5's VF28 with a TD05H 20g (and obviously all associated supporting mods added) -- mapped by Simon to 384/349.

Obviously the 20g is a tad laggy when compared to the VF28... but considerably more powerful/torquey once it does come on boost. :)


As 99gw implies, if you want to all but guarantee your 360 goal then, at the very least, a proper 18g (e.g. one from harvey) will be needed. Getting 360 on the VF34/35/43/48 is unlikely (but you might get near).

The VF 48 is good enough for me it'll save my gearbox and in a 700kg car, should be just about quick enough :) :thumb:

dont get me wrong,im running a vf48 on my type r and with the low ratio gearing it makes for a very fast road car.:thumb:

agreed joz,dont forget to fit a new set of spark plugs before mapping.:D

Sparkies FTW!

FTW??:wonder:

when you selling your 20g joz?:norty:

What other supporting mods are you running Joz? 384 is a very healthy figure. I am aiming for at least 360 otherwise it is not worth doing plus the ability to get more torque over the VF28 is desirable. I dont want to murder the gearbox so am happy with 360-380.

what year car do you have? and which model?

You need to worry about the engine, 13+ years old and 350bhp is deemed as top end reliability, they use to rebuild these at 320bhp in the early days, and those engines were not tired or have as many miles on the clock, so note that I would not want to really want to run more than 320-330bhp on any classic 2ltr turbo engine (they are not like the new age STI engines which are much stronger).
Stick with a vf30/34/35/48 and go for drivability rather than out and out power.

Tony:)

so would you say by fitting a 20g you lose driveability?how laggy are they? i hit 1bar boost at 3425 rpm in 4th gear with a vf48 on 2ltr.

Well my vf36 is on full chant by then in comparison (standard car btw), but that really doesnt say anything, it gets there quite quickly from 1k to that also ;)
With a 20G its going to seem an age in reality, single scroll will suffer badly with lag on a turbo that size, no matter what anyone say's, its going to be pretty laggy compared to a vf48.

Tony:)

For the win.


Never! :D

Depends if I decide to take the plunge and change to twin scroll. :cuckoo:

Already accrued the headers/uppipe/sump/440 injectors. Just need the 440s flowed to 930cc by Lateral, a GC8-pattern TS d/p, and of course the turbo - SC42 Billet, probably. :D

But will I do it...................? :wonder: Answers on a postcard to... :D

If I do do it, you can have first refual on the 20g. Been on since Nov. '10 (fitted by API) and been working/delivering the goods beautifully lol. ;)

May I refer the Rt. Hon. gentleman to "My Garage", where a comprehensive list of my mods awaits his delectation... :D

Mine hits the mapped target boost (1.5bar quickly settling to 1.4) at between 4.0-4.2k.

So it prob hits 1bar at a similar rpm point as your VF48 does, at c.3.4k odd(?).


It wouldn't be worth moving to a 20g IMO.

so NOT that laggy then? i dont find my vf48 laggy as the low ratio box means the revs are always up fairly high anyway,so when you plant your foot down the boost is right there with no waiting at all. i can see how a uk car with 20g would be very laggy as the gearing is so much longer,im wondering how much quicker, if at all will a type r be with a 20g over a vf48?:wonder:
lets so over quater mile run?:norty:

I have gearing 'in between' a vanilla WRX and a DCCD Type R/RA, what with it being a regular STi.

I expect yours feels fine with your Type R's ultra quick gearing/F.D.?

Currently have a V5 Sti myself which i only aquired recently after 2 UK Turbo's wish i had of made the choice sooner tbh such a better car!

Getting it remapped on the 14th by JGM can't wait:) Only upgrade's ive made is full deca, walbro 255l upgraded fuel pump and panel filter change... Quite like the VF28 but its enevable its going to stay that way very long;)

Anyway already been looking at turbo's like the Op and have stopped at the MD series yes bit expensive but Produce good figures etc.

joz8968 had a look at yours in your garage :thumb:very nice bud! By the looks you've never rebuilt your engine or upgraded your gearbox? If so thats good don't know the capabilites of these cars so found that intresting...

yes,it dosent feel laggy whatsoever,so if i stepped up to a 20g im assuming that will feel ok too? will the car be quicker or, in effect actually slower?
even though it will produce more power and torque?:wonder:

99gw, what's your MAX. target boost and when does it come in at, in 4th? Go out later and let us know...

Yep. Original engine and 'box. With c.47k on 'em. API 'red' modded/uprated oil pump though.

So far so good. But I rarely hoon... And if I launch from rest, it's only prob. circa 1 in 100 times! Seriously. In any case, I always get the wheels rolling, rather than dump all the torque into the drivetrain in one go! Ouch!

Nice1 cheers for info m8:thumb: