VF30
03 February 2003, 03:45 PM
#2
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It could boost creep at the top end as it or its variants do on the STis. With the problems you have had with your engine I strongly advise you to fit a VF28 that would have come with the car at least initially until you get everything sorted (ie boost control, fuelling, oil usage). I think at some point your engine needs a compression test too before you put any performance parts on. Just my 2p.
03 February 2003, 07:20 PM
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Whats the difference with the vf30 compared to the vf28 ? Is it bigger ! The vf28 will be hard to get hold of ! What makes you think i'll need to do a compression test ?
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03 February 2003, 07:43 PM
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VF30 has a bigger compressor and it can easily boost creep at the top on some cars - like the situation with your downpipe.
If you don't use boost control or remap you will lose out on spool up and it will probably boost creep at the top.
Compression test because you were using oil at an astonishing rate (in a week what I use in a year), before you push the engine I think you need to know it will hold compression otherwise you are flogging a dead horse.
If you don't use boost control or remap you will lose out on spool up and it will probably boost creep at the top.
Compression test because you were using oil at an astonishing rate (in a week what I use in a year), before you push the engine I think you need to know it will hold compression otherwise you are flogging a dead horse.
03 February 2003, 09:56 PM
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John,
I thought only the VF35 has the tendency to boost creep.
I once remapped a MY00 with VF30, I had to use 91% Wastegate duty at high revs to achieve about 1.2 bar@6000 RPM and 1.1 bar@7.000 RPM.
Mark.
I thought only the VF35 has the tendency to boost creep.
I once remapped a MY00 with VF30, I had to use 91% Wastegate duty at high revs to achieve about 1.2 bar@6000 RPM and 1.1 bar@7.000 RPM.
Mark.
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04 February 2003, 05:47 AM
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Boost creep, can someone explain this to me. Is this a limitation of the solenoid not being able to control boost levels properly or something to do with the wastegate, or something else.I'm keen to know.
I'm currently running a VF-30 but using a ball and spring type bleed and WOT boost is always 1.2 +-.02 bar.Of course I can't do any tapering and I will soon be going back to the factory solenoid.
Mark
MY99
I'm currently running a VF-30 but using a ball and spring type bleed and WOT boost is always 1.2 +-.02 bar.Of course I can't do any tapering and I will soon be going back to the factory solenoid.
Mark
MY99
04 February 2003, 07:06 AM
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The inability of the wastegate assembly to flow enough gases to reduce boost to the desired level. Can be a physical problem with the wastegate port size, or a flow problem (ie; a downpipe which blocks the gas flow exiting from wastegate, like the OE one).
It generally only becomes an issue when upping boost above stock, and at high revs (high gas flow numbers).
Richard
It generally only becomes an issue when upping boost above stock, and at high revs (high gas flow numbers).
Richard
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