Anyone seen this J&K Supercharger around?
05-26-16, 03:16 AM
#1
Racer
Thread Starter
Anyone seen this J&K Supercharger around?
So found this being sent around in a whatsapp group we have in the middle east, was surpsied as I've never seen this covered here.
Anyone heard of a company called J&K in Japan?
Link to the build with pics ---> http://minkara.carview.co.jp/summary/1281/
Does sound lovley
Anyone heard of a company called J&K in Japan?
Link to the build with pics ---> http://minkara.carview.co.jp/summary/1281/
Does sound lovley
05-26-16, 08:45 AM
#4
pretty sure I saw it in the IS-F thread I just don't care enough to dig for it. They have an IS-F version as well as RC-F which are probably nearly identical.
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05-26-16, 07:00 PM
#10
You mean the blow-off valve? Maybe weird, but it's very important part of the whole system.
It relieves boost pressure when you're not in throttle in order to prevent overboosting and engine damage.
It's usually more audible when you have an open element intake system, like the one used in this RCF.
It relieves boost pressure when you're not in throttle in order to prevent overboosting and engine damage.
It's usually more audible when you have an open element intake system, like the one used in this RCF.
05-26-16, 08:17 PM
#11
It's a supercharger. That setup on the RCF doesn't have a wastegate, which are more for turbochargers to control boost. BUT, some folks are now using external wastegates on superchargers so they can control boost.
05-26-16, 09:26 PM
#13
That flutter sound is probably the longest on going debate in all turbocharged car forums. Some will tell you it is the dreaded 'compressor surge', which is very bad since it damages the compressor side of the turbo. But after years of reading through these debates, compressor surge flutter is only extremely bad when you come off high boost. But BOV flutter is actually normal coming off low boost(below 5psi)...and if you do not hear that flutter coming off of high boost, than you are ok. If he really mashed WOT at higher RPM on the RCF, the BOV would break with a clean whoosh...but with short half throttle revs at low rpm, you get the flutters.
The surge/flutter sound is caused when you let off the throttle, the TB is closed but the compressor is still spinning...the bov's job is to relieve that trapped pressure, but at low boost that pressure is not high enough for the BOV to open completely, so that low pressure bounces back and forth within the charged pipe and slowly gets relieved by the BOV in a skipping manner. Centrifugal superchargers are effected also because they have a compressor design like a turbo. Some think you have to tighten your BOV, but than you run the risk of boost pressure not being relieved properly...and some say to loosen your BOV, which actually can create and act like a leak. Ideally, the flutter is bad, but the consensus now is that it is ok at low boost pressure. How to get rid of the fluttering, recirculate the air back through the intake...but than you don't hear anything, not even the whoosh.
An external wastegate can also flutter as well, but it is completely different and doesn't necessarily occur when you let off the throttle completely.
The surge/flutter sound is caused when you let off the throttle, the TB is closed but the compressor is still spinning...the bov's job is to relieve that trapped pressure, but at low boost that pressure is not high enough for the BOV to open completely, so that low pressure bounces back and forth within the charged pipe and slowly gets relieved by the BOV in a skipping manner. Centrifugal superchargers are effected also because they have a compressor design like a turbo. Some think you have to tighten your BOV, but than you run the risk of boost pressure not being relieved properly...and some say to loosen your BOV, which actually can create and act like a leak. Ideally, the flutter is bad, but the consensus now is that it is ok at low boost pressure. How to get rid of the fluttering, recirculate the air back through the intake...but than you don't hear anything, not even the whoosh.
An external wastegate can also flutter as well, but it is completely different and doesn't necessarily occur when you let off the throttle completely.
Last edited by Fsport2UR; 05-26-16 at 09:36 PM.
05-27-16, 06:08 AM
#14
That's because most diverter or atmospheric dump valves are designed to open via a strong vacuum reference since they have to pull against a pre-loaded spring. Like mentioned, require being tight enough to not leak, but also not overly tight in that they never open unless full vacuum is present.
That's where a valve like Synapse comes into play. You can blip the throttle and still get a full discharge.
That's where a valve like Synapse comes into play. You can blip the throttle and still get a full discharge.
05-27-16, 06:53 AM
#15
You mean the blow-off valve? Maybe weird, but it's very important part of the whole system.
It relieves boost pressure when you're not in throttle in order to prevent overboosting and engine damage.
It's usually more audible when you have an open element intake system, like the one used in this RCF.
It relieves boost pressure when you're not in throttle in order to prevent overboosting and engine damage.
It's usually more audible when you have an open element intake system, like the one used in this RCF.