VF34
18 March 2006, 07:35 PM
#4
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Would have thought so. I'm aiming for 300-320bhp with standard 380cc injectors, a Walbro 255 pump, Power FC and a sports catted H&S system plus factory headers.
18 March 2006, 09:15 PM
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Should get between 330-350bhp with a VF34 with supporting mods, might be able to give you a more accurate answer after mines is rolling roaded next saturday.
Might be worth getting the wastegate ported before having it fitted to stop boost creep if your running de-catted. Mine was fine when i first fitted it, but once the turbo was run in and had lossen up started getting boost creep.
Check this site out: http://www.pghsubarus.com/tech/porting/porting.aspx
Might be worth getting the wastegate ported before having it fitted to stop boost creep if your running de-catted. Mine was fine when i first fitted it, but once the turbo was run in and had lossen up started getting boost creep.
Check this site out: http://www.pghsubarus.com/tech/porting/porting.aspx
18 March 2006, 11:09 PM
#7
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Well I'd stick with a VF if your only ever going to want 350bhp tops. If you're planning on more then the TD05 is the way forward, but which version, I don't know. Is the 16g just the standard one from early WRXs?
The VF series look nicer as well LOL
The VF series look nicer as well LOL
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19 March 2006, 12:46 AM
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The Link refers to a US WRX STi, which has a 2.5lt.
Big engines, small turbo's = potential boost creep.
A VF34 on a 2.0lt should not suffer from boost creep.
Both turbo's have similar flow, and spool up, although you may struggle to achieve 350bhp on some rolling roads, but they will be close.
Mark.
Big engines, small turbo's = potential boost creep.
A VF34 on a 2.0lt should not suffer from boost creep.
Both turbo's have similar flow, and spool up, although you may struggle to achieve 350bhp on some rolling roads, but they will be close.
Mark.
19 March 2006, 11:07 AM
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Well mine is on a 2.0 UK classic with a full 3" exhaust and once the turbo had lossened up. I started getting quite bad boost creep, the car would hold boost to about 5500rpm then start creeping up. When set to 1.15 bar would creep to over 1.3 bar and when set to 1.3 bar would creep to over 1.5 bar.
As the car is only mapped to 1.3 bar this meant i had to run a lower setting to allow for the creep.
Had the wastegate ported as describe in the above link and the problem is now sorted, holds boost right the way to the red line.
As the car is only mapped to 1.3 bar this meant i had to run a lower setting to allow for the creep.
Had the wastegate ported as describe in the above link and the problem is now sorted, holds boost right the way to the red line.
19 March 2006, 01:14 PM
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If the waste gate is so restrictive that it can boost creep to 1.5bar, it wll creep to 1.5 bar whether you map it for 1 bar, 1.3 bar, or even remove the hose from the actuator completely.
What you're describing doesn't sound like it was caused by a restrictive waste gate, but more likely a boost mapping/boost set up type issue, which has either just been masked/slugged by the porting, or sorted in the removing/refitting of the turbo.
Mark.
What you're describing doesn't sound like it was caused by a restrictive waste gate, but more likely a boost mapping/boost set up type issue, which has either just been masked/slugged by the porting, or sorted in the removing/refitting of the turbo.
Mark.
19 March 2006, 02:21 PM
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Originally Posted by turboDean
Check this site out: http://www.pghsubarus.com/tech/porting/porting.aspx
"Use a magnetic wand to catch metal bits from going back into the turbine." - Sounds like a recipe for disaster
19 March 2006, 02:57 PM
#13
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Well if you're thinking of 380-400bhp and a new gearbox eventually then why not do it now, get one of the hotter hybrid TD05s and go for it? There are plenty of threads on here discussing the merits of 18g, 20g, this wheel and that wheel...
19 March 2006, 03:37 PM
#14
Do not really want to go down the 6 speed route due to the extra weight and not really happy with the ratios. But the price of a uprated 5 speed is something i cannot justify.
Might take a chance with my sti 3 gearbox and see how it copes. Would love a car that will accelerate to 100mph in under 10 seconds.
Might take a chance with my sti 3 gearbox and see how it copes. Would love a car that will accelerate to 100mph in under 10 seconds.
24 March 2006, 09:30 AM
#15
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LOL yes 0-100 in under 10 is handy for sure. My old Clio used to do it in just over 11 and that was running around 250bhp/tonne on road tyres and obviously front wheel drive. I'd imagine if you could crack say 300bhp/tonne on a 4wd chassis you'd hit your target, although I've never dragged my own Scooby so I wouldn't know for sure.
24 March 2006, 12:56 PM
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my vf34 on my my00 uk with full supporting mods is between 340 and 350 bhp depending on fuel
made 340.1 with 348 lbs/ft torque 3 days ago on straight optimax , has made more but that was when i added a bottle
however,if i had my time again,which will hopefully be soon then i'll be getting the td05/18g and Link ecu. gearbox and clutch already sorted but will need uprated internals me finks
just haven't decided to go 2.5 or just strengthen the 2.0 UK block
made 340.1 with 348 lbs/ft torque 3 days ago on straight optimax , has made more but that was when i added a bottle
however,if i had my time again,which will hopefully be soon then i'll be getting the td05/18g and Link ecu. gearbox and clutch already sorted but will need uprated internals me finks
just haven't decided to go 2.5 or just strengthen the 2.0 UK block
25 March 2006, 03:36 PM
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Just come back from Powerstation and my my00 with vf34, FMIC and supporting mods made 312 bhp on optimax, but did only peak at 1.28 bar of boost, normally runs about 1.35 bar.
Not a great result but not to bad and they do say you get quite big differences between different rolling roads, so may get more elsewhere.
There were a couple of cars with VF34's and VF28's and they all made around 310-320.
Not a great result but not to bad and they do say you get quite big differences between different rolling roads, so may get more elsewhere.
There were a couple of cars with VF34's and VF28's and they all made around 310-320.
25 March 2006, 03:46 PM
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Will try and post the graph for you later, feels great on the road pulls right the way from 3000rpm up to redline. Yours being an STI you may get slightly better results with the better heads and higher rev limit.
Last edited by turboDean; 25 March 2006 at 04:36 PM.
25 March 2006, 04:35 PM
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Graph now added in the members gallery check out this link:
http://bbs.scoobynet.co.uk/showthread.php?t=491418
http://bbs.scoobynet.co.uk/showthread.php?t=491418
25 March 2006, 07:43 PM
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Originally Posted by banny sti
Will i make my power target of 350bhp??
25 March 2006, 08:17 PM
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Turbodean,
What did Power Station say about your graph ?
IMHO, I think you need to get your map looked at. You have two bad dips in power, 1st starting at circa 3600rpm, and the 2nd starting at around 5000rpm, but very bad at 5900rpm.
This would indicate either a boost, fuel, or ignition timing issue, or a combination.
Dr.P,
The VF35 has the same size compressor, and exhaust wheels as the VF34, but a SMALLER exhaust housing for earlier spool up, even though the VF35 is not a ball bearing turbo.
It certainly won't achieve anywhere near 400bhp. 320-350bhp depending on supporting mod's, mapping, and rolling road.
Mark.
What did Power Station say about your graph ?
IMHO, I think you need to get your map looked at. You have two bad dips in power, 1st starting at circa 3600rpm, and the 2nd starting at around 5000rpm, but very bad at 5900rpm.
This would indicate either a boost, fuel, or ignition timing issue, or a combination.
Dr.P,
The VF35 has the same size compressor, and exhaust wheels as the VF34, but a SMALLER exhaust housing for earlier spool up, even though the VF35 is not a ball bearing turbo.
It certainly won't achieve anywhere near 400bhp. 320-350bhp depending on supporting mod's, mapping, and rolling road.
Mark.
25 March 2006, 10:02 PM
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Originally Posted by R19KET
Turbodean,
What did Power Station say about your graph ?
IMHO, I think you need to get your map looked at. You have two bad dips in power, 1st starting at circa 3600rpm, and the 2nd starting at around 5000rpm, but very bad at 5900rpm.
This would indicate either a boost, fuel, or ignition timing issue, or a combination.
Mark.
What did Power Station say about your graph ?
IMHO, I think you need to get your map looked at. You have two bad dips in power, 1st starting at circa 3600rpm, and the 2nd starting at around 5000rpm, but very bad at 5900rpm.
This would indicate either a boost, fuel, or ignition timing issue, or a combination.
Mark.
Last edited by turboDean; 25 March 2006 at 10:21 PM.
26 March 2006, 01:18 PM
#28
Scoobydazza if you have a look on this thread it shows what mods the car is running
http://bbs.scoobynet.co.uk/showthread.php?t=491418
http://bbs.scoobynet.co.uk/showthread.php?t=491418
26 March 2006, 02:40 PM
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Originally Posted by scoobyDAZZA
have you got
3-port boost solenoid
uprated fuel pump
bigger injectors
3-port boost solenoid
uprated fuel pump
bigger injectors
Not really bothered at the moment, car drives well and everyone had quite low figures from Powerstation, couple with VF34's and VF28's only hit between 310-320. Even a type R with 2.5 bottom and TD05 20G only manged 367BHP which i would of excepted to make 380-400 without any problems.
Not planning anything for the engine for a while want a new interior next, then suspension mods, then maybe do some more to the engine, want to put a reversed inlet manifold and ported headers then i will get the map tweeked again.
Last edited by turboDean; 26 March 2006 at 02:43 PM.
26 March 2006, 10:30 PM
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Originally Posted by banny sti
Scoobydazza if you have a look on this thread it shows what mods the car is running
http://bbs.scoobynet.co.uk/showthread.php?t=491418
http://bbs.scoobynet.co.uk/showthread.php?t=491418
i did look , the reason i asked is in case he forgot to add them
i'd have thought with his mods,which are almost identical to mine,he'd need the 3 items i mentioned
mine's been on 3 different rollers and always makes between 340 and 350 bhp
here's my spec,excsuse the caps as i have them saved in my note pad thingy
IHI VF 34 TURBO
K+N 57i
550CC INJECTORS
GT SPEC HEADERS
H+S DOWNPIPE
BLITZ NUR SPEC R SYSTEM
NGK PFB7R SPARK PLUGS
LIGHTENED PULLEYS
MAGNECOR HT LEADS
WALBORO FUEL PUMP
FRONT MOUNT INTERCOOLER
RE-MAPPED FOR OPTIMAX BY BOB RAWLE DEVELOPMENTS
SAMCO HOSES ALL ROUND
BAILEYS VENTURI DUMP VALVE
3-PORT BOOST SOLENOID
very similar