would you change a VF22 for a VF28????
 

as above really.

Had a UK99 which I had a VF28 fitted to and mapped up, made 309bhp and I loved it.

Decidied to sell it due to the running costs, but I have recently bought a V3 WRX which has a VF22 on it, I am going 5o get a Simtek ECU fitted but can't make my mind up to whether or not I change the turbo to a VF28.

On the road I seem to hit full boost from 3800rpm in 5th gear, do you think it is worth changing from a VF22 to a VF28?????

Damo

p.s. I have a VF28 in the garage

Have copied and posted this from a .pdf I have - but not sure where I got it now. Might be useful info for you.

VF22
WRX Japanese domestic market
Best turbo for high output engine. Highest capacity of all IHI “STi” turbo’s. OK for high boost or
stroker engines. Best fitted with cars that at least have a front mount intercooler. Not recommended
for really big boost stroker engines or cars that run over 25 psi boost.
Same Turbine housing and wheel as a VF23 (20) with larger Compressor housing.
Only fit this turbo if you have at least an exhaust, front mount intercooler and air inlet mods. Its
good also if you plan internal engine mods.
This turbo has the most lag of all the VF series.

VF23
Sti Ver 3 June 1996
Good all round turbo with straight inlet path
Same compressor housing and wheel as a VF24 with larger Turbine housing (20)
Great turbo for mildly modified cars and those who are unsure of their plans for the future

VF24
STi ver 4, June 1997
Common for Group N rally cars and has good bottom end. Not recommended for stroker engines or
engines with high boost as turbo is small and can over speed.
Same compressor housing and wheel as a VF23 with smaller Turbine housing (18)
Best turbo for Auto’s and cars that want the best bottom end and least lag.

VF28
STi Ver 5, June 1998.
Basically the same as VF24

VF29
WRX Japanese domestic market
Basically the same as VF24 except has a different location for the pressure hose on the waste gate
actuator
Compressor wheel is slightly different.

VF30
STi ver 7Oct 2000
A totally new design and shape “VF” series turbo
Common on Group A rally cars where more capacity is required than is possible with the VF24.
Good turbo as compromise between the VF23 and VF22, as it has the same size turbine housing as
a VF24 and a compressor housing similar to a VF 22
A relatively new turbo to the market and still being “tried and tested” early indications are it will
replace the VF 23, with slightly more capacity.

You will find the VF28 spools well and early but has a bit less top end than the VF22.

Thanks for all the info it came from NASIOC I think but I'm still undecided, does anyone think it is a worthwhile swap???

Damo