I guess I will make my speech again. Diverter Valves(DV) and Blowoff valves(BOV) are all the same thing.... a BYPASS VALVE(BV)!

People automatically assume that a BOV is vented to atmosphere and that a DV is recirculated. Wouldn't it be easier to ask if the motor will be an OEM MAF setup or an aftermarket MAP (speed density) setup instead making an unsupported assumption?

MAF equipped motors require a sealed system because if air that has been metered by the MAF gets vented to atmosphere by a DV/BOV/BV the engine will receive a rich air/fuel mixture. Aftermarket BOV's will not harm the performance of a MAF equipped motor as long as it is recirculated like the OEM setup. Just stay away from that ultra lothargic HKS SQV/SSQV crap.

If needed I can explain the difference between MAF and MAP systems but I am sure that information can be found on this site by doing a search!

If you are buying a BOV for the sound then you are buying it for the wrong reason!!!

 

Can someone give me a quick reply whether the JDM MR DV can be crushed as the 1G valve can? Sorry for the OT.

 

The point I was making (which you missed), is that anyone that *is* asking the question, isn't running Speed Density on a standalone. Therefore, the answer is completely valid in that context.

 

Yes.

 

So say I have an 8 and stock boost with a mail-in flash, I get a spike of 21 sometimes 22 do I need to upgrade my stock bov?

 

I am running the JDM DV on my 2003 EVO. I upgraded only because in 2003 the DV was plastic and didn't like to hold 20+ psi. The JDM metal DV which is what comes on the 2006 EVOs holds boost just fine. Determine how much boost you want to run then do a boost leak check at that psi and see if your DV will hold the pressure or not. Mine holds 27psi just fine. No reason to upgrade at all.

 

It would be a good idea. If you had an IX, the answer would be no.

 

They do unless you switched to a different setup PERIOD Also no dont vent on any MAF equipped car PERIOD

If your running speed density or a blowthru. Then DUH obviously you can vent it. Its not rocket science. EVOM

 

Obviously your cool EVO isnt running a MAF sensor. DUH.

 

I am running VTA with a MAF and 540whp stock turbo.

 

But it's not daily driven and doesn't really make 540whp.

 

Yea that dont count

 

sorry for my stupid question now, i have a evo IX i just got like 2 weeks ago and i put in the hks uip with the hks ss bov, also have the hks carbon fiber exhaust catback....is that bad for my car?

 

With 128mph traps on MY DAILY DRIVER.

http://www.speedworldmotorplex.com/calc.htm

You do the math.

 

We've been through this 1000 times, Scott. That calculator is not accurate for an AWD car.
Last time at the track, I trapped 109.5 consistently, and on their scale, I was showing 3380lbs with driver. Using that calculator, it says I have 346whp. Guess what, I only dyno'd 299.6 on a Dynojet - nowhere near 346. If you go by my ET of 12.30, it says I'm making 359whp - oops, even further off from reality.

Although no one knows how you magically went from 123 to 127mph traps, and although we haven't seen you duplicate it, 127.xx mph still only equals to 480-490whp, not 540whp. And when did it become a daily driver? It sure wasn't in the past.

Yes, 06, you made a pretty big mistake purchasing all those HKS parts - it was just a waste of money. The UICP is not hurting the car, but it's not helping either - it was just an expensive use of your money that could have been used towards parts that make power. The HKS SSQV _is_ bad for the car and should be sold then replaced with your stock BOV, which NEVER should have been removed. The cat-back is fine, but again, you just paid a lot for the HKS name and aren't making much power. It's important to not get sucked into the ricer mentality of only purchasing things from HKS if you care about performance. If you don't care, then buy whatever you want.