Which Blow Off / Dump Valve??

As most of you know, im currently doing my turbo conversion. i want to install a dump valve into the system so i get that 'Tssschhhh!' noise when i change gear, but i dont wanna skimp on the looks either. Can anyone suggest a nice dump valve, not silly money stuff though. Please post links or pics.

I would go with a Apexi twin chamber blow off valve. It can be adjusted and has two chambers to assist in opening the relief valve. But it really comes to personal choice, they all do the same damn thing.

HKS makes about the loudist blowoff valve ive ever heard. i also heard they have nice internals and dont break much. just my 2 cents.

yeah, i quite fancy a HKS SSQV

http://files.automotiveforums.com/uploads/155798HKS-SSQV.jpg

go for the Greddy BOV Type-S! It looks good and is highly constructed out of aluminum. The best thing about it is that it is adjustable

I would recirculate the BO air. Seriously you'll probably end up with driveability problems. I mean it might drive OK but wouldn't you rather have better power and drivability than sound?

If you'd rather just have the sound get one of these. :D


http://www.takakaira.com/php/template.php3?id=163&cat=3

haha:hehehe: thats so funny its scary!!:D i didnt honestly think anyone would come up with something like that let alone buy one! i like the 'Tssschhhhh' but not that much or that bad!

Have you ever seen the plastic intercooler kits? $125 I believe?

http://www.visracing.com/images/aero-cooler.jpg


Get that and that fake BOV noise!! LOL :bloated:

Dude I'm serious. I saw a civic with one of these a while ago. I was waiting at a light trying to turn left I saw this civic crusing down the oncoming lane. From a far I though, oh cool he's got a turbo. Then as he got close I noticed it was FLAT and obviously fake. I thought it was just the lamest thing I've ever seen! I guess it all goes back to the guys that would stuff socks in their shorts to make their package look bigger. Trying to look like you have something you don't. It's sad really. :(

hey, you guys can come up with some wierd shit:D but hell its funny:hehehe: the thing is, i can actually see people buying this shit!

Ive ordered the HKS SSQV off the same guy who got me the head gasket, well in actual fact, its around the same price so i asked if he could swap it for me, as he already has my money. Its just, while im turboing my DE, i wanna do it right, and do it nice.

G-Force, what is the downside of NOT recirculating the gases? my guess was that it could create a slight lag, as the pressure would have to be built up again when boost comes in.

Originally posted by P11GT
G-Force, what is the downside of NOT recirculating the gases? my guess was that it could create a slight lag, as the pressure would have to be built up again when boost comes in.
It's been talked about before, but I'll reiterate again. PAY ATTENTION NEXT TIME! :D

Nissan air measureing units acutally measure the volume or mass of the air that passes it. The CPU accounts for this 'mass' and sends fuel to the chamber as appropriate. If you dumped off that air then you'll get more gas and not enough air. Because ou dumped it out of the system and the ECU thinks it should be there. What will probably end up happenig is you get some stumbling during shifts and when you let off the gas during high acceleration. Worst case you foul up your plugs eventually and degrade performance. I think after anyone goes turbo it would be a good idea to keep an eye on those plugs for a while.

HKS VPC baby!!! hehe...bye bye to maf!

speaking of fake intercoolers...i saw a mirage with one of those and the evo 4 body kit, it has the evo 4 wing, wide body but skinny stock tires....it even has the EVO 4 emblem on the car....so horrible/funny
the best part...it's a mirage coupe! hahaha.....

Thanks G, i understand now. the good thing is, that buying this valve has not been a waste as ive come across this fitting.
http://files.automotiveforums.com/uploads/608734HKS-recirlulationfitting.jpg
so if it doesnt work out as expected, then i can always use this to recirculate the gases on the HKS SSQV

whats a HKS VPC??? sounds interesting

Vein Pressure Controller...basically a fuel management system that replaces the oem air metering device...such as the MAF. it gives you the ability to tune air flow and fuel delievery. you actually physcially remove the oem air meter outta your car and replace it with the VPC. it also comes with a controller device to fine tune air/fuel that's in the car.
it's very very good stuff but also very costly.

and the ECU will "believe" that the VPC is the MAF? wouldnt you have to get the ECU retuned for the VPC?

What about the Apexi S-AFC? and maybe a AVC-R? can these do the same job?
http://files.automotiveforums.com/uploads/972090ApexiS-AFC.jpg
text on S-AFC;
DIGITAL SUPER AFC - Piggyback Fuel Computer

Modifies air-flow meter signal (pressure signal in some vehicles) to optimize fuel-air ratio; Vacuum Fluorescent Display (VFD).

The second-generation S-AFC is a fuel computer that adjusts fuel/air ratio by modifying the air-flow meter/MAP sensor signal. The S-AFC features a user-definable, eight-point, adjustable fuel curve that can be set in 500 RPM increments. The range of fuel adjustment is +/- 50% at each of the user-defined setting points. On hot-wire vehicles, the Deceleration Air Flow Correction function is capable of curing the erratic idle and stall problems associated with open-atmosphere blow-off valves on hot-wire air-flow meter systems. The S-AFC is capable of monitoring and replaying the following data channels in Numerical, Analog Meter and Graph displays: Intake Manifold Vacuum/Boost Pressure, Air Flow Capacity, Intake Manifold Pressure, Karmann Frequency, Engine RPM, Throttle Position, and Air Flow Correction %.

http://files.automotiveforums.com/uploads/642679ApexiA-VCR.jpg
text on AVC-R;
Advanced electronic boost controller

Highly flexible boost control with revolutionary new functions; Vacuum Fluorescent Display (VFD).

The Super AVC-R is the premium closed-loop electronic boost controller on the market. The AVC-R allows flexible control over virtually every aspect of boost control and adds new innovative functions such as injector pulse monitoring and gear specific boost control. Some key functions include: RPM-based boost and solenoid duty cycle control, scramble boost, self learning mode, 2D ghost map trace mode, analog display mode, real time replay and peak hold data modes. The AVC-R utilizes an ultra-fast microprocessor and a high quality solenoid valve to control boost. The result is ultra-fast response and accurate, stable boost control.

These things have 2d maps they are OK but not a really good tuning solution. You basically get what you pay for. They work off rpm only (I think) and you can really botch up if you misadjust somethign.

The good stuff stand alone and piggy back systems like the TEC-II and Motec systems are 3d maps that take into account throttle position (WOT, tip-in, etc), rpm, engine VE, and more crap than you thought an ECU took into consideration. :D It would be a REAL fun toy to play with but I think I'll just get JWT to do my ECU tuning for me. ;)

well i guess its gonna have to be something like this then.
http://www.apexi-usa.com/electronics_fc.asp
http://files.automotiveforums.com/uploads/548440ApexiPowerFC.jpg

Dont you have the UniChip?

Yeah the Unichip would work fine too. Although I don't think he can tune it himself. They sell you the box and the tuning but if you want something changed you have to go back and have it changed with their software.

Yeah, i got the unichip, but was looking for something a bit better. Would it work on an open loop system? ive never enquired about it. I think i'll have a look on Dasteks site.
http://www.dastek.co.za

the VPC physically replaces all the air sensors that's in the motor and hooked up to a separate controller device, you use the controller device to tune the air/fuel settings, not the ecu.
the Power FC is a very powerful tool that you can use to tune your car as well. most Supra and RX-7s that's making serious power and reliable for the track uses power FC to fine tune them. But, make sure your tuner knows how to do it...if you are thinking about getting it and mess with it yourself, don't bother.
you can also send your ECU to the US and have JWT remap it for ya.

Didnt HKS discontinue making VPC's for the US market?