vf34
17 July 2011, 11:35 PM
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vf34
hi people ive brought a vf 34 today for my classic i fitted a 20g last week and oh my god LAGGING HELL so how will my vf 34 be and do they make decent power advice is much appreciated 
17 July 2011, 11:53 PM
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It will be much better, its a roller bearing turbo but the rest depends on what you have done with your engine and other mods to what sort of power it will make.
Tony
Tony
17 July 2011, 11:59 PM
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oh great lads thanks ive got 980cc injectors bit big i know simtec ecu 3inch open neck down pipe full exhaust walbro pump and fuel reg standard sti v4 topmount for now so you say it will be quick spooling thats good 20g doesnt start spooling until 5000rpm and i have to change gear at 7
18 July 2011, 12:06 AM
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oh great lads thanks ive got 980cc injectors bit big i know simtec ecu 3inch open neck down pipe full exhaust walbro pump and fuel reg standard sti v4 topmount for now so you say it will be quick spooling thats good 20g doesnt start spooling until 5000rpm and i have to change gear at 7
Mine starts spooling about 3800rpm and hits full boost of 1.4bar very quickly, maybe by 4100-4200rpm. These figures ,ay be slightly wrong because I don't have a graph showing the boost pressure along side rpm so I'm guessing.
Didn't hit the 350+bhp figures that everyone says they can get. A few mappers have told me that realistically it is a 330-340bhp turbo.
18 July 2011, 12:12 AM
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very similar spec to me although I have an STI8 top mount fitted, 550cc injectors, 3" turbo back, tubular headers and uppipe and the VF34. I achieved 328bhp on the rollers after it was mapped. Also running simtek.
Mine starts spooling about 3800rpm and hits full boost of 1.4bar very quickly, maybe by 4100-4200rpm. These figures ,ay be slightly wrong because I don't have a graph showing the boost pressure along side rpm so I'm guessing.
Didn't hit the 350+bhp figures that everyone says they can get. A few mappers have told me that realistically it is a 330-340bhp turbo.
Mine starts spooling about 3800rpm and hits full boost of 1.4bar very quickly, maybe by 4100-4200rpm. These figures ,ay be slightly wrong because I don't have a graph showing the boost pressure along side rpm so I'm guessing.
Didn't hit the 350+bhp figures that everyone says they can get. A few mappers have told me that realistically it is a 330-340bhp turbo.
18 July 2011, 12:19 AM
#7
oh great lads thanks ive got 980cc injectors bit big i know simtec ecu 3inch open neck down pipe full exhaust walbro pump and fuel reg standard sti v4 topmount for now so you say it will be quick spooling thats good 20g doesnt start spooling until 5000rpm and i have to change gear at 7
Jura
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18 July 2011, 08:53 AM
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Yes it is, vid on youtube of it on that actual dyno as well. Did 2 dyno runs at different venues with only 4bhp difference between them. Definitely a vf34 as well. Going to look at headers and uppipe next, suspect they may be too large and uppipe not flow matched to vf34. Plus putting hybrid fmic before next remap.
18 July 2011, 12:44 PM
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i will be going down front mount route when funds allow as long as ther good turbos tho and spool is quick thanks again oh and i also want sum headers etc aswell
18 July 2011, 07:50 PM
#12
20g doesnt start spooling until 5000rpm and i have to change gear at 7
Before you go any further you might want to find the cause of your problem. Your injectors are way too big but that on its own will not be the issue. The correct selection of headers and uppipe has a big effect on spool and power and the car has to be mapped by someone that knows what they are doing.
18 July 2011, 09:25 PM
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car was mapped by simon ie jollygreen monster how much are the headers mate ive got my vf34 now anyway so happy days
18 July 2011, 09:38 PM
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There is something very far wrong here unless you have an e-Bay special. I have 20Gs that I build spooling to 1 bar in 4th gear on a level road, starting at 1700 rpm and making 1 bar anywhere between 3140 rpm and 3600 rpm.
Before you go any further you might want to find the cause of your problem. Your injectors are way too big but that on its own will not be the issue. The correct selection of headers and uppipe has a big effect on spool and power and the car has to be mapped by someone that knows what they are doing.
Before you go any further you might want to find the cause of your problem. Your injectors are way too big but that on its own will not be the issue. The correct selection of headers and uppipe has a big effect on spool and power and the car has to be mapped by someone that knows what they are doing.
18 July 2011, 09:51 PM
#15
vf 34 is where its at as far as spool and drivability is concerned with a sub 400bhp car, you will not find a better turbo for the 350bhp mark and when coupled with a short ratio gear box you will not find a better driving scooby. and that really is the end.
Unless your after much more power then you enter into another league.
And lots more ££"S for not a great deal more reward, on the road.
Unless your after much more power then you enter into another league.
And lots more ££"S for not a great deal more reward, on the road.
18 July 2011, 10:28 PM
#17
Take note of what Harvey has said.
I run a proper 20G and I can assure you it spools a hell of alot earlier than 5K. From memory it made full boost (1.6bar) by 6000 rpm.
I went from a vf28 which is known as a fast spooling turbo and my 20G spools quicker. This was probably helped by the fitting of Laterals GT spec manifold and up pipe though.
I run a proper 20G and I can assure you it spools a hell of alot earlier than 5K. From memory it made full boost (1.6bar) by 6000 rpm.
I went from a vf28 which is known as a fast spooling turbo and my 20G spools quicker. This was probably helped by the fitting of Laterals GT spec manifold and up pipe though.
18 July 2011, 10:33 PM
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yea thanks mate but 20g is going now already got my 34 for the power i want will be plenty just trien to upload sum pics of my car but cant work out how to do it lol
19 July 2011, 12:21 PM
#21
Ported headers and matched uppipe, all DEI heat wrapped, stainless steel, specially designed, slip jointed uppipe with five new Subaru studs is £230 for headers exchange and £139 for the uppipe to match your turbo/spec. there are six uppipes to choose from as obviously one uppipe will not do all specs/turbos. Delivery £12.50 or fitting either uppipe or headers and uppipe is a fixed £75.
We do not do ceramic coating. you would have to get that done yourself.
About seven or eight years ago, before ceramic coating became the must have on S/Net I went on to ceramic coating of various items. After 18 months or two years this practice stopped because we found that after that after a while, on stainless steel headers and uppipes, subject to very high EGTs the ceramic coating would flake. We also discovered that the thermal properties were no better than the heat wrap we use now.
There was also the cost consideration ceramic coating v/v heat wrap plus time delays at a subcontractor.
We now use DEI heat wrap. Not a cheap heat wrap but the best all round product we could find and a customer on Saturday morning pointed out that his headers wrapped four years ago by me were still in good condition.
GT Spec tubular header set with three bolt gasket and uppipe supplied is £445.
DEI heat wrap doing each runner separately is £110.
My special three bolt trick uppipe, DEI heat wrapped, slip jointed (to take stress and strain off the headers to prevent cracking of headers with constant heat recycling) purpose designed, five new Subaru studs, two to choose from £149 with or without boss for EGT etc.
Full boost on a 20G should be around 4,000 rpm or just after and the 20G is a good 20 bhp + ahead of the VF34 which is more comparable with an 18G.
I think this answers all the questions.
We do not do ceramic coating. you would have to get that done yourself.
About seven or eight years ago, before ceramic coating became the must have on S/Net I went on to ceramic coating of various items. After 18 months or two years this practice stopped because we found that after that after a while, on stainless steel headers and uppipes, subject to very high EGTs the ceramic coating would flake. We also discovered that the thermal properties were no better than the heat wrap we use now.
There was also the cost consideration ceramic coating v/v heat wrap plus time delays at a subcontractor.
We now use DEI heat wrap. Not a cheap heat wrap but the best all round product we could find and a customer on Saturday morning pointed out that his headers wrapped four years ago by me were still in good condition.
GT Spec tubular header set with three bolt gasket and uppipe supplied is £445.
DEI heat wrap doing each runner separately is £110.
My special three bolt trick uppipe, DEI heat wrapped, slip jointed (to take stress and strain off the headers to prevent cracking of headers with constant heat recycling) purpose designed, five new Subaru studs, two to choose from £149 with or without boss for EGT etc.
Full boost on a 20G should be around 4,000 rpm or just after and the 20G is a good 20 bhp + ahead of the VF34 which is more comparable with an 18G.
I think this answers all the questions.
19 July 2011, 04:50 PM
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thanks for the reply harvey wot would the gains be for ported headers and matched up pipe for vf34 could well be interested in a set so for the headers wrapped and uppipe to match 34 delivered if you do delivery thanks because i think your abit to far away from me to come to you and fit them
20 July 2011, 07:56 AM
#23
Delivery same price anywhere in the UK including N.I, Highlands and Islands.
I cannot tell you what the gains will be simply because every car is different and it even depends on what rolling road you use but I have not fitted ported headers and matched uppipe to anyone that has been disappointed as far as I know. You will find the car more responsive with more torque right across the rev range, a crisper driver altogether.
Delivery £12.50 or fitting either uppipe or headers and uppipe is a fixed £75.
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