View Poll Results: The best turbo for 340bhp, peoples opinions please...
VF34
14
34.15%
VF35
8
19.51%
TD05 16g
19
46.34%
Voters: 41. You may not vote on this poll
Poll on the best turbo for 340bhp...
28 March 2007, 11:39 AM
#31
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As usual with late spec Classics it would appear there are subtle differences in specs.
The VF29 came on WRX RA the VF28 on the STI RA.
looks like we're both right lol
Incedently my car has the six speed box so i have the low ratio 1st - 4th with long 5th and 6th best of both worlds lol
The VF29 came on WRX RA the VF28 on the STI RA.
looks like we're both right lol
Incedently my car has the six speed box so i have the low ratio 1st - 4th with long 5th and 6th best of both worlds lol
VF28 is STi Version 5: set up properly, will boost from 2800 rpm
VF29 is STi Version 6: set up properly, will boost from 2900 rpm
Both shift 425 cfm and are nearly the same Certainly identical outside, VF 29 has a changed compressor wheel. It is based on VF 24 which is to all intents the same except for the wheel.
Because of that you'd make VF29 the choice over VF24. However probably only Michael Schumacher could tell you the difference in all of them when driving.
David APi
28 March 2007, 12:39 PM
#33
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Right, well here is the spec of my engine, and the mods it has:-
Currently on 74k; but had a bottom-end rebuild at 58k with forged pistons and billet rods (imported from America; but not sure what make)
Full Ninja System and decat/downpipe
Green Panel Filter
EcuTek Tek 3
Uprated Oil Pump
Walbro Fuel Pump
And I have waiting to go on (before the turbo and re-map):-
Ported Headers
STi8 TMIC
4bar FPR
So can anyone hazard a guess as to what power I could achieve and with what different turbo's??
Currently on 74k; but had a bottom-end rebuild at 58k with forged pistons and billet rods (imported from America; but not sure what make)
Full Ninja System and decat/downpipe
Green Panel Filter
EcuTek Tek 3
Uprated Oil Pump
Walbro Fuel Pump
And I have waiting to go on (before the turbo and re-map):-
Ported Headers
STi8 TMIC
4bar FPR
So can anyone hazard a guess as to what power I could achieve and with what different turbo's??
28 March 2007, 01:31 PM
#34
anyway i have a VF34 with full decat, ported standard headers, STi injectors, STi intercooler and am getting 333bhp & 325ft lbs torque 
not sure how much more you can get out of it but it does have a safe Bob Rawle remap 
so i assume with a bit of OB and a slightly more aggressive map could get it up to 340-350bhp 
28 March 2007, 01:51 PM
#35
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I was lead to believe that the VF34 spooled up slightly earlier than the VF35 as it has roller bearings anyway i have a VF34 with full decat, ported standard headers, STi injectors, STi intercooler and am getting 333bhp & 325ft lbs torque not sure how much more you can get out of it but it does have a safe Bob Rawle remap so i assume with a bit of OB and a slightly more aggressive map could get it up to 340-350bhp
anyway i have a VF34 with full decat, ported standard headers, STi injectors, STi intercooler and am getting 333bhp & 325ft lbs torque not sure how much more you can get out of it but it does have a safe Bob Rawle remap so i assume with a bit of OB and a slightly more aggressive map could get it up to 340-350bhp Also, IIRC Andy F came on here recently and said that sometimes the individual difference between cars amounted to more than the difference between these turbos.
Spool threshold and lag DOES matter on a Uk non-Sti car though. A 500rpm difference might not sound like much but you WILL notice it. In 5th gear my VF35 is good to go from 2500rpm.
My classic with supporting mods made 320bhp with a VF35 on a BRD map, but a new age will probably make about 10-15bhp more with the same mods. It doesn't feel too dissimilar in terms of spool characteristics to the TD04 set up, but hits much harder and stays right up to the red line, which is what you want.
Ns04
28 March 2007, 02:01 PM
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IIRC mate, the VF35 has the P15 exhaust housing so spools up quicker than the 34 which has the P18. The exchange is that the VF34 has a slightly better top end.
Also, IIRC Andy F came on here recently and said that sometimes the individual difference between cars amounted to more than the difference between these turbos.
Spool threshold and lag DOES matter on a Uk non-Sti car though. A 500rpm difference might not sound like much but you WILL notice it. In 5th gear my VF35 is good to go from 2500rpm.
My classic with supporting mods made 320bhp with a VF35 on a BRD map, but a new age will probably make about 10-15bhp more with the same mods. It doesn't feel too dissimilar in terms of spool characteristics to the TD04 set up, but hits much harder and stays right up to the red line, which is what you want.
Ns04
Also, IIRC Andy F came on here recently and said that sometimes the individual difference between cars amounted to more than the difference between these turbos.
Spool threshold and lag DOES matter on a Uk non-Sti car though. A 500rpm difference might not sound like much but you WILL notice it. In 5th gear my VF35 is good to go from 2500rpm.
My classic with supporting mods made 320bhp with a VF35 on a BRD map, but a new age will probably make about 10-15bhp more with the same mods. It doesn't feel too dissimilar in terms of spool characteristics to the TD04 set up, but hits much harder and stays right up to the red line, which is what you want.
Ns04
28 March 2007, 03:20 PM
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VF29 came on the WRX, VF28 came on the STI, for both v5 and v6.
VF28 is STi Version 5: set up properly, will boost from 2800 rpm
VF29 is STi Version 6: set up properly, will boost from 2900 rpm
Both shift 425 cfm and are nearly the same Certainly identical outside, VF 29 has a changed compressor wheel. It is based on VF 24 which is to all intents the same except for the wheel.
Because of that you'd make VF29 the choice over VF24. However probably only Michael Schumacher could tell you the difference in all of them when driving.
David APi
VF29 is STi Version 6: set up properly, will boost from 2900 rpm
Both shift 425 cfm and are nearly the same Certainly identical outside, VF 29 has a changed compressor wheel. It is based on VF 24 which is to all intents the same except for the wheel.
Because of that you'd make VF29 the choice over VF24. However probably only Michael Schumacher could tell you the difference in all of them when driving.
David APi
28 March 2007, 06:26 PM
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28 March 2007, 07:39 PM
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28 March 2007, 11:41 PM
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Spool threshold and lag DOES matter on a Uk non-Sti car though. A 500rpm difference might not sound like much but you WILL notice it. In 5th gear my VF35 is good to go from 2500rpm.
My classic with supporting mods made 320bhp with a VF35 on a BRD map, but a new age will probably make about 10-15bhp more with the same mods. It doesn't feel too dissimilar in terms of spool characteristics to the TD04 set up, but hits much harder and stays right up to the red line, which is what you want.
Ns04
My classic with supporting mods made 320bhp with a VF35 on a BRD map, but a new age will probably make about 10-15bhp more with the same mods. It doesn't feel too dissimilar in terms of spool characteristics to the TD04 set up, but hits much harder and stays right up to the red line, which is what you want.
Ns04
1) You mention 5th - I take it your car spools up at 2500 revs across the gears ?
2) Why do Newages make more bhp with the same mods - is it due to their bigger intercoolers ? (and yes, I know they more than soak it up with their fatter bellies !
)Andy Mc
29 March 2007, 12:32 AM
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Ns04,
1) You mention 5th - I take it your car spools up at 2500 revs across the gears ?
2) Why do Newages make more bhp with the same mods - is it due to their bigger intercoolers ? (and yes, I know they more than soak it up with their fatter bellies ! )
Andy Mc
1) You mention 5th - I take it your car spools up at 2500 revs across the gears ?
2) Why do Newages make more bhp with the same mods - is it due to their bigger intercoolers ? (and yes, I know they more than soak it up with their fatter bellies !
)Andy Mc
In answer to #2;
I may be wrong, but it could be down to the more sophisticated ECU on newage cars (esp 03>)..?
The VF35 on my 05 WRX with usual mods makes around 330-340ish and hits 1 bar@ 2800 with peak (1.5) @3200rpm in 4th with a fully heated system/turbo..
IMHO go for lower response over an extra 10-20bhp top end for a real world fast road car, hence the VF35.
BUT also seriously consider a TD04 hybrid, which should get you close to 330 but with absolutely sensational low down boost/response that will see of laggier turbos with higher/peak BHP..
It's not all about peak figures remember..!
29 March 2007, 07:46 AM
#43
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Ns04,
1) You mention 5th - I take it your car spools up at 2500 revs across the gears ?
2) Why do Newages make more bhp with the same mods - is it due to their bigger intercoolers ? (and yes, I know they more than soak it up with their fatter bellies ! )
Andy Mc
1) You mention 5th - I take it your car spools up at 2500 revs across the gears ?
2) Why do Newages make more bhp with the same mods - is it due to their bigger intercoolers ? (and yes, I know they more than soak it up with their fatter bellies !
)Andy Mc
Hey Andy,
1) I mention 5th as it's where you want a good response most, being the longest gear etc... Jason's description sounds feasible to me (must get that boost gauge) 1 bar at 2800 and full boost by 3200.
2) New ages have the superior Denso ECU mate, you'd have to ask a mapper about how you can extract more bhp with them, but apparently you can.
Next step for me....FMIC then back to Bob!!
Ns04
29 March 2007, 08:18 AM
#45
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eBay.co.uk: Subaru impreza P1 /STi Top mount intercooler (item 200094513385 end time 04-Apr-07 21:07:34 BST)
Would this go on, and provide the necessary cooling for 340bhp??
Would this go on, and provide the necessary cooling for 340bhp??
29 March 2007, 09:51 AM
#46
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May be worth having a word with Harvey about his Hybrid FMIC. Seems to be well regarded. I know Bob's mapped a few of them too, so perhaps have a word in his ear and see what his recommendation is?
Ns04
unless he has sorted that out
29 March 2007, 12:27 PM
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In answer to #2;
I may be wrong, but it could be down to the more sophisticated ECU on newage cars (esp 03>)..?
The VF35 on my 05 WRX with usual mods makes around 330-340ish and hits 1 bar@ 2800 with peak (1.5) @3200rpm in 4th with a fully heated system/turbo..
IMHO go for lower response over an extra 10-20bhp top end for a real world fast road car, hence the VF35.
BUT also seriously consider a TD04 hybrid, which should get you close to 330 but with absolutely sensational low down boost/response that will see of laggier turbos with higher/peak BHP..
It's not all about peak figures remember..!
I may be wrong, but it could be down to the more sophisticated ECU on newage cars (esp 03>)..?
The VF35 on my 05 WRX with usual mods makes around 330-340ish and hits 1 bar@ 2800 with peak (1.5) @3200rpm in 4th with a fully heated system/turbo..
IMHO go for lower response over an extra 10-20bhp top end for a real world fast road car, hence the VF35.
BUT also seriously consider a TD04 hybrid, which should get you close to 330 but with absolutely sensational low down boost/response that will see of laggier turbos with higher/peak BHP..
It's not all about peak figures remember..!
What does "1bar" actually feel like - is this just the initial spool, or is it a pleasing thump in the back ?!
Andy
PS Do the last classics and the first newages have the same ECU ?
Last edited by andythejock01wrx; 29 March 2007 at 12:30 PM.
29 March 2007, 12:29 PM
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Hey Andy,
1) I mention 5th as it's where you want a good response most, being the longest gear etc... Jason's description sounds feasible to me (must get that boost gauge) 1 bar at 2800 and full boost by 3200.
2) New ages have the superior Denso ECU mate, you'd have to ask a mapper about how you can extract more bhp with them, but apparently you can.
Next step for me....FMIC then back to Bob!!
Ns04
1) I mention 5th as it's where you want a good response most, being the longest gear etc... Jason's description sounds feasible to me (must get that boost gauge) 1 bar at 2800 and full boost by 3200.
2) New ages have the superior Denso ECU mate, you'd have to ask a mapper about how you can extract more bhp with them, but apparently you can.
Next step for me....FMIC then back to Bob!!
Ns04
29 March 2007, 04:40 PM
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29 March 2007, 05:14 PM
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29 March 2007, 06:27 PM
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sorry to completely hijak your thread but youve got me interested now
what turbo does my MY99 WRX Import have as standard (mines the 276bhp version)... just so I know what to change up too!
what turbo does my MY99 WRX Import have as standard (mines the 276bhp version)... just so I know what to change up too!
29 March 2007, 06:45 PM
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29 March 2007, 08:41 PM
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Just kidding, I could go for the Sti 8 conversion, but by the time I've paid for a good un, and the work under the bonnet so that it'll fit, I figured that I might as well go the whole hog and get an FMIC.
The Sti8 intercooler is good to 400bhp + by all accounts
A good FMIC, however, is a better solution in a classic as it eliminates the problems with heatsoak inherent in the TMIC design and also keeps the temps down at speeds where the duff aerodynamics of the bonnet mean that air misses the bonnet scoop and, therefore, the TMIC (not good).
The sownside is that you have to cut your bumper about for it to fit and you might get a little more lag than with a TMIC owing to the increased pipework.
Ns04
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