Which Mods?
Interesting post this, especially as I'm considering an 18G as my next upgrade. Currently I have: 3" custom exhaust and Harvey Smith downpipe plus sports cat, Harvey Smith ported headers and up-pipe (all heat wrapped), wrapped standard (VF35) turbo, Walboro 255, Hybrid FMIC and wing mounted air intake - all mapped by Andy F. The car is quick with a nice spread of torque 
; Andy's road dyno test (below) gave 351bhp and 330lb/ft. I think Andy was able to map a little more agressively thanks to the FMIC. I'm encouraged by what Rob and others say on here about the 18, which would seem to provide gains all round and virtually no drawbacks over VF35. One thng though - can someone explain what a 3 port boost solenoid is and why it's worth having with an 18G ??
; Andy's road dyno test (below) gave 351bhp and 330lb/ft. I think Andy was able to map a little more agressively thanks to the FMIC. I'm encouraged by what Rob and others say on here about the 18, which would seem to provide gains all round and virtually no drawbacks over VF35. One thng though - can someone explain what a 3 port boost solenoid is and why it's worth having with an 18G ??
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From: SMACS
Originally Posted by GazTheHat
Barnesy, just thought i'd condense what's been said. I've been speaking quite a bit with RLE too, we've done our homework on this 
should expect around 330/330 with the first stage, then
18g + blanket (£850-£1000)
induction kit (£150-£250)
3" is not necessary, but advised. (£350-£800)
3 port boost solenoid, not necessary, but some advise. (£150)
this will see you around 360/360.
headers & up-pipe will be a good mod (£400)
FMIC (£650-£1000) is optional.
should expect around 330/330 with the first stage, then
18g + blanket (£850-£1000)
induction kit (£150-£250)
3" is not necessary, but advised. (£350-£800)
3 port boost solenoid, not necessary, but some advise. (£150)
this will see you around 360/360.
headers & up-pipe will be a good mod (£400)
FMIC (£650-£1000) is optional.
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From: 392/361 MY04 STi
Good graph. What wing induction did you go for?
The 3PBS just allows greater control over boost, when over about 1.3bar. I'm sure a techie will give some more info. But for this stage of modification, it seems it is recomended and a lot of people have gone that route.
It's more a "I don't know what it really is, but i should have one"
The 3PBS just allows greater control over boost, when over about 1.3bar. I'm sure a techie will give some more info. But for this stage of modification, it seems it is recomended and a lot of people have gone that route.
It's more a "I don't know what it really is, but i should have one"
Last edited by GazTheHat; Oct 17, 2006 at 05:32 PM.
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From: 392/361 MY04 STi
Originally Posted by Barnesy
Cheers for that, whats the blanket on the turbo?
A blanket will normally do 4 turbos, and thanks to a generous SNetter, passed the excess on to me.
So i'm sure he wouldn't mind me passing it on again.
Originally Posted by GazTheHat
Good graph. What wing induction did you go for?
It's more a "I don't know what it really is, but i should have one"
It's more a "I don't know what it really is, but i should have one"
- Know that feeling! The wing kit came with the hybrid FMIC as supplied by Harvey, although I has to supply the actual filter. I thought that £600 all in including fitting was a fair price indeed. In fact Harvey has been extremely helpful in helping to explain the ins and outs of Impreza tuning generally to a relative novice like me and would like to thank him publicly for all his help 
the three port will help you hold peak boost a lot better/ longer mate.
Mine tails off pretty rapidly but I'm confident the remap with Bob is going to resolve all my current issues.
Mine tails off pretty rapidly but I'm confident the remap with Bob is going to resolve all my current issues.
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