Prototyping is fun :)

[BoxerSix]

I tell ya, I'll never get sick of R&D and prototyping parts. So much fun vs the standard automotive tuning crap these days.

Just some pics of a reversion chamber I developed for the Evo's and their damn BOV flutter. This problem has occurred on every Evo I've worked on, been around, etc and up until now it was thought to have been a problem with just the aftermarket valves. Eric Smith proved me wrong apon swapping from the Forge unit to an OEM MR valve only to have the same condition.

For those that do not know, the condition revolves around the BOV and it's hyper sensitivity to throttle input. This may not be apparent to you drag guys who are all go, but to anyone who actually tracks the car and needs to modulate the throttle it is. It also occurs randomly while cruising mid throttle or going up hills......This may not seem like a big deal to you, but go throw your car through a 30mph corner at 100 and lift off the throttle near the apex and tell me it's not...

Anyway I'll know more about weather this solves the issue or not on Thurday as I'll have both Eric's and Mike's evo's here. Both an 8 and a 9 GSR so I get to test both chassis(Mivec vs non Mivec). The chamber is designed to dampen the natural plenum intake reversion and shockwave on the boost/vacuum transition, yet not restrict signal flow in any manner. Those who don't know what reversion is need not worry, it's nothing you need to tweak yourself and wouldn't want to get into yourself anyway

If it works expect to see it on the shelves soon Hope you like. Mind the crudeness, I whipped it up from various scrap around the shop after doing some math and didn't feel like prettying it up for you.

Some of the guts



Assembled prototype

[GranMassaX]

you are my hero. Mark me down for one if all goes well

[Celtic1982citleC]

Very cool. My evo would've loved this!

[QuickLT1]

Looks like some sort of penis enlarger, brew maybe interested!

Haha, nice work thou!

[MikeyB.]

[crazybrew609]

i want 12.. oh wait i have neither an evo or a trubo so i don't need one.. but good work and it looks awsome adam as usual

[Cavi Mike]

Is this when trying to use an atmospheric blow-off instead of using a bypass valve?

[19Cutlass94]

Nice! Looks great!

[Captain Moai]

What kind of BOV is the OEM mitsu valve?

If you want, I've got an OEM Toyota valve here sitting around doing nothing, in case you need it for a mockup. It's a twin chamber pressure-differential style valve with a spring assist. The more you boost, the harder it's held shut, but most importantly it's got insanely fast response to changes in pressure differential.

Feathering the throttle under boost results in a rather embarassing farting sound from the intake. It's vibrating to maintain pressure. That's how fast it reacts.

http://www.megaboost.co.uk/old/pics/...ard-bov-01.jpg

[mikecentola]

hehe i like when your car farts, eric!

[BoxerSix]

Originally Posted by Moai

Feathering the throttle under boost results in a rather embarassing farting sound from the intake. It's vibrating to maintain pressure. That's how fast it reacts.

That's what i'm trying to reduce on these Evo's. The response is nice, but the sensitivity makes it annoying on the street, and very dangerous on the track or even goofing around on some twisties like I found out personally.

Erics car had the Forge DV valve, Mikes has the RS. Erics car now has the stock MR valve with differential chamber.....still does it. Leads me to believe it not the valves, but rather the reversion in the plenum. I say this because Mikes car had this TERRIBLY on the way up to Moon for that d day, running on the meth map. Once we converted back to the original(and superb) street map from Justin the issue subsided drastically, but still remains. The other ironic part......all cars that seem do this have been cammed Again...fucking with intake reversion. The math is the sucketh!

I'll let you know how it works out...