dump valve
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24 August 2013, 10:38 PM
#9
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Can we please make a sticky thread for dump valves?
OP - if you want a dump valve I'd recommend a Forge Recirc or a GFB Respons or if you are budget limited look for the discontinued part GFB Stealth FX Pro. I would not recommend running a full VTA system based on what I have learned.
Balance Motorsport and Scoobyworld are the best place to look as far as I have found.
24 August 2013, 10:50 PM
#11
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Can we please make a sticky thread for dump valves?
OP - if you want a dump valve I'd recommend a Forge Recirc or a GFB Respons or if you are budget limited look for the discontinued part GFB Stealth FX Pro. I would not recommend running a full VTA system based on what I have learned.
Balance Motorsport and Scoobyworld are the best place to look as far as I have found.
24 August 2013, 11:02 PM
#14
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When you use a VTA it messes up the fuelling due to the ECU being told by the MAF sensor how much air is being drawn in. The ECU then calculates how much fuel to add, when the VTA dump valve bleeds off air this causes the car to run rich. The potential is bore wash and fuel getting past the piston rings into the oil degrading it and screwing up the engine.
24 August 2013, 11:03 PM
#15
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Yes seriously, it's an important part of my current setup and also on tens of other cars I have setup. It took a few years of R+D to get it right but everyone running my setup is happy with it, I am just curious as to why VTA is hated so much. 
24 August 2013, 11:25 PM
#16
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When you use a VTA it messes up the fuelling due to the ECU being told by the MAF sensor how much air is being drawn in. The ECU then calculates how much fuel to add, when the VTA dump valve bleeds off air this causes the car to run rich. The potential is bore wash and fuel getting past the piston rings into the oil degrading it and screwing up the engine.
24 August 2013, 11:37 PM
#17
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What if I told you that a VTA can be setup to eradicate that problem. 70% of the cars I have setup run Ecutek with the MAF still in place and none of them have any issues at idle or on boost. You will only get issues with VTA and the MAF if you have it set to dump everything, a good VTA can be set and matched to run perfectly with your current setup and give zero running/fuelling issues.
Someone prepared to stand their ground.
25 August 2013, 12:08 AM
#20
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It's more about how much volume of charge air you have to play with, FMIC is better for the flutter noise you are after, then you have 2 options really set a Recirc or VTA so that it retains some charge air in the Intercooler and associated pipework which will cause a slight compressor stall and give you the noise you are after at low boost levels, or blank off the DV port and you will have it right through the boost range however that puts huge stress on the turbo and stalls the compressor violently on lift off from full boost, making gear changes potentially jerky and lagy
Last edited by Big 'D'; 25 August 2013 at 12:25 AM.
25 August 2013, 12:19 AM
#21
Got to be a wind up this one
The residential dump valve advisors have moved away from scoobynet and have moved to fb
Please contact tubby for authorisation to join us for a 'discussion '
Entry is free as long as you post a picture if your car so we can discuss its suitability for a dv
Ppppssssttttt
The residential dump valve advisors have moved away from scoobynet and have moved to fb
Please contact tubby for authorisation to join us for a 'discussion '
Entry is free as long as you post a picture if your car so we can discuss its suitability for a dv
Ppppssssttttt
25 August 2013, 12:48 AM
#22
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What if I told you that a VTA can be setup to eradicate that problem. 70% of the cars I have setup run Ecutek with the MAF still in place and none of them have any issues at idle or on boost. You will only get issues with VTA and the MAF if you have it set to dump everything, a good VTA can be set and matched to run perfectly with your current setup and give zero running/fuelling issues.
I run my GFB full recirc and largely use it as a piece of engine bay bling but understand that there may be some advantage to running slight VTA. If someone wants to comprehensively explain why VTA is good or beneficial I'm open to ideas - please put it on here or the "official thread" I started a while back.
As for flutter I can easily get the flutter sound if I whack the spring up to max, but haven't chosen to keep it like that.
25 August 2013, 01:07 AM
#23
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Hence the reason I said "full VTA". I drove an RB320 with a VTA Forge item and it ran like a bag of nails, yet experimented massively with my GFB Stealth FX on a blob and found little problems below 25% VTA.
I run my GFB full recirc and largely use it as a piece of engine bay bling but understand that there may be some advantage to running slight VTA. If someone wants to comprehensively explain why VTA is good or beneficial I'm open to ideas - please put it on here or the "official thread" I started a while back.
As for flutter I can easily get the flutter sound if I whack the spring up to max, but haven't chosen to keep it like that.
I run my GFB full recirc and largely use it as a piece of engine bay bling but understand that there may be some advantage to running slight VTA. If someone wants to comprehensively explain why VTA is good or beneficial I'm open to ideas - please put it on here or the "official thread" I started a while back.
As for flutter I can easily get the flutter sound if I whack the spring up to max, but haven't chosen to keep it like that.
25 August 2013, 01:07 AM
#24
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What if I told you that a VTA can be setup to eradicate that problem. 70% of the cars I have setup run Ecutek with the MAF still in place and none of them have any issues at idle or on boost. You will only get issues with VTA and the MAF if you have it set to dump everything, a good VTA can be set and matched to run perfectly with your current setup and give zero running/fuelling issues.
On my Scooby I run a MAP sensor due to my stand alone ECU so no issues for me.
25 August 2013, 01:20 AM
#25
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What I was trying to say there mate was that a VTA can be setup to eradicate the issues normally associated with VTA without the requirement for a remap.
25 August 2013, 07:22 AM
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But will the op actually bother to remap the car just to run a fart valve? My 2005 came with a HKS one. Didn't actually run too bad and I'm still getting pops and bangs from the sports cat exhaust since I fitted a standard valve. Just felt like a tit every time the HKS shat its pants. may be its a maturity thing!
may be its a maturity thing!
25 August 2013, 10:37 AM
#28
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That's is down to personal choice, as far as I can figure out the only down side to the VTA is the noise, if setup correctly there are no running issues and improvements can be made in through the gears acceleration by managing the charge air correctly.
How do you figure this? I highly recommend using VTA, through all the testing I have done it has proven to be the most efficient and manageable way of dealing with surplus charge air. However it must be setup to suit your car, if you just slap on any old VTA you are asking for issues.
Cheers Iain
Cheers Iain
Last edited by Big 'D'; 25 August 2013 at 10:40 AM.
25 August 2013, 11:31 AM
#30
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Also I have not met anyone who has setup their VTA to match their cars current setup
Cheers Iain