looking into a tial q BOV, just need help with what spring to get in it (setup is gonna be 500+whp, also would like to know what you guys are using and could recommend.
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i use 2 APR R1 vented to atmosphere. -
Pretty much standard S3 version. Is there really any benefit in the Forge metal recirculating versions and was told you should not vent to atmosphere if still running the motronic ECU
1986 Coupe q - 2281cc 3B, chargecooler, 2.75" exh & downpipe, ported head, water injection, CGR box, modified MD357 turbo, 440cc injectors, high power coil.
2004 A4 2.5TDi convertible, re-mapped to 180bhp
2011 A5 sportback 3TDi-Backbox delete, remapComment
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a80avant uses vemsComment
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Forge 007 for me - 4 years and no issues - only thing to mention is that it's connected with the high pressure acting radially on the piston rather than axially. The spring is not the only thing that applies the presure to the valve - the boost from the inlet is applied to the top of the piston, thus equalising the pressure over the top and bottom, give or take a PSI. The same connection also applies a vacuum to the valve when on over-run / idle and this, combined with the excess boost, causes the valve to open. The spring pretty mch makes up the difference and controls opening on idle.
Don't vent to atmosphere if you're keeping the stock MAF location but if it's going on the pressure side, then vent away.Cheers'en, AndyC
1994 ABY Coupe - Projekt AlpinweissComment
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One check you can do is to electrically disconnect the N75 (leave all the hoses alone!!!) and then do a WOT run. Stock boost is 0.4 bar, with a little tolerance on that value for the boost gauge. Anything way over 0.5 bar and it's an uprated spring.
Stock spring is approx. 3N/mm spring rate and about 80m long. Anything loads longer or that looks like it should be on a mountain bike and it's an aftermarket one.Cheers'en, AndyC
1994 ABY Coupe - Projekt AlpinweissComment
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Needs a remap AFAIK.Cheers'en, AndyC
1994 ABY Coupe - Projekt AlpinweissComment
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Ok thanks!!photobucket SUCKS
sigpicComment
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By-pass valve information
Just for reference (not for 500 hp) here is some info about the stock BPV:
RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avantComment
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The 710N valves work just fine at 500hp as well.
No air going backwards through the MAF etc.
BTDT and not 1 time.Comment
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