Originally Posted by davidm_sh
I went from a VF22 to an 18G on my 02 WRX. Also did my runs at Bandimere (5280ft asl) on pump gas.
Mods with VF22:
-MRT 3" catless TBE
-pinks + GSS342
-TXS TMIC v1
-boost up to 17psi down to 15psi by redline - all it would hold to redline
-pump gas 93 octane
ran a 1.85 60' - 13.2@101
Mods with 18G:
-added GP MOTO 4-2-1 headers
-did NOT change tune one bit for headers
-20psi peak and to redline for boost
ran a 1.96 60' - email@example.com
Same spool as the VF22 but more topend.
Originally Posted by pezman04wrx
Wow, that's one heck of an improvement ...
I'm not certain I agree. The extra 3 to 5 lbs of boost and the set of headers could be all the difference. And while his post says 15psi was "all it could hold at redline" I'm not certain what that means. Every person I've ever known with a vf22 has never had any problem running 20+psi all the way to redline. The problem has always been "not enough fuel", and too much boost. It's no suprise where the "more topend" is coming from, the extra 5psi of boost. 5 lbs is a huge difference!
I'm not dissing the 18G, it's a great turbo and should perform better than a vf22. But what is stated above is not what I would call a fair comparison.