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Atmospheric DV....again
- Thread starter adam cupra 20vt
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- atmospheric dvagain
thats how mine sounds but you cant hear it on video as ive got straight through exhaust
is this the one mate ??
http://cgi.ebay.co.uk/HKS-SSQV-2-du...arts_Vehicles_CarParts_SM?hash=item2558dacff3
The incoming air is measured by the MAF and the ECU injects the correct amount of fuel to match the airflow, by venting to atmosphere you are venting measured air so the amount of fuel the ECU injects will be wrong/too high because of the loss of measured air. The closed loop recirculating system keeps the amount of air in the system correct.
People may say "I have no problems whatsoever" but you're not seeing what's going on inside your engine due to too much fuel. Fouled plugs, bore wash (where fuel dilutes the oil in the bores and you get wear on the piston rings and bores), damaged CAT, damaged 02 sensors and so on.
Is it worth it just for a bit of sound?
People may say "I have no problems whatsoever" but you're not seeing what's going on inside your engine due to too much fuel. Fouled plugs, bore wash (where fuel dilutes the oil in the bores and you get wear on the piston rings and bores), damaged CAT, damaged 02 sensors and so on.
Is it worth it just for a bit of sound?
when i had my MR2 there was alway a similar debate.
As the air going through was metered it would fuel for it but becuase it was vented to atmosphere it would then cause the car to run rich, stall and have very poor/jump throtlle respose. From about 1995 (rev3) they changed the way it was metered with a AFM not a MAF (i think thats the right way round) so you could then run one.
I did try a VTA for a while but it did cause the car to run rich and not longer smooth it also lost performace so i went back to the recirc.
HKS SSQ is probably the best ro run, i ran it on my S14a but Blitz also do good one to that is more or a pigeon sound and can alos re-circ if you want it. That is what a ran on my Evo it wasnt extremely load but still sounded good, better that the HKS in my opinion.
As the air going through was metered it would fuel for it but becuase it was vented to atmosphere it would then cause the car to run rich, stall and have very poor/jump throtlle respose. From about 1995 (rev3) they changed the way it was metered with a AFM not a MAF (i think thats the right way round) so you could then run one.
I did try a VTA for a while but it did cause the car to run rich and not longer smooth it also lost performace so i went back to the recirc.
HKS SSQ is probably the best ro run, i ran it on my S14a but Blitz also do good one to that is more or a pigeon sound and can alos re-circ if you want it. That is what a ran on my Evo it wasnt extremely load but still sounded good, better that the HKS in my opinion.
we have a winner 
basically as above your going to be overfueling, i dont think enough to cause borewash as a remap will tend to run a little rich,
basically as above your going to be overfueling, i dont think enough to cause borewash as a remap will tend to run a little rich,
Max_torque gave the facts on atmospheric dump valves and the Bosch engine management system in http://www.seatcupra.net/forums/showthread.php?p=107507#post107507
Im with Karlw here we both ran MR2 turbos for a good few years.
basically if you want the best performance stick with a recirc. if you want a nice sound then get a BOV.
I ran a bailey DV26 on my MR2 for about 6 months then ripped it off, it was a pull type setup so the vacuum would pull the piston shut on boost. spring wore out quickley, and it used to leak. not very good.
then changed to a HKS SSQV, still a twin piston but it was a sequential setup this time and when on boost the piston was pushed shut. it never leaked and made a nice sound.
from personal experience i didnt find bailey to be made very well.
basically if you want the best performance stick with a recirc. if you want a nice sound then get a BOV.
I ran a bailey DV26 on my MR2 for about 6 months then ripped it off, it was a pull type setup so the vacuum would pull the piston shut on boost. spring wore out quickley, and it used to leak. not very good.
then changed to a HKS SSQV, still a twin piston but it was a sequential setup this time and when on boost the piston was pushed shut. it never leaked and made a nice sound.
from personal experience i didnt find bailey to be made very well.
As far as I know, HKS Europe are doing a deal on MK4 GTi SSQVs for £170 + vat until stock runs out. I considered this for my LCR but the way the DV fits looks weird. Basically from the diagrams, it looks like you block the TIP connection up (correct) but then you remove the hose that goes from the charge pipe to the DV in OE location and stick the SSQV directly onto the charge pipe. Maybe this just looks weird due to the LC & GTi single IC assembly.
you gotta watch eBay mate, alot of the HKS/APEXI/Blitz stuff on there are copies, they leak are made from plastic and are known to fall apart quickly.
genuine HKS SSQVs for for around the £200 mark.
these are the 1st gen ones
these are the current 2nd gen ones (just a different case, the internals remained the same)
hth
Good answer Rob....I don't have an argument for that one
So what were actually saying is you can run one but you will run a bit rich as there is the expected fuel going in but less air as some is being dumped to atmosphere....I understand the argument now
Also makes you think about people running the 50/50 valves as although these dump 50% of the air back the other 50% is still escaping.......no fault codes logged [as with the twin piston atmospheric] but must be overfueling?
Also if this is the case the car must over fuel if it has a boost leak?
Running a 50/50 or BOV valve has a detrimental effect on a cars MPG so overfuel must be an issue.
I've read that but I've ran a 50/50 for last 3 months with no loss of MPG.
I'm running my Forge again now as thats what it was mapped with so I left it on.
Just makes you think whats going on that you can't see.
I'm running my Forge again now as thats what it was mapped with so I left it on.
Just makes you think whats going on that you can't see.
What are these then as Forge make/sell them for Leon Cupra R's - http://www.forgemotorsport.co.uk/content.asp?inc=product&cat=190202DV&product=FMDVSPLTR
Thats a 50/50 valve inless you run it in full recirc.
That would be un metered air.
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