Apexi Ecv (electronic Control Valve)

[PAV34]

Got a Blitz exhaust and its a tad loud so ive put it for sale. I dont really want to sell it becuase its looks really nice on the car.

Then i came across the Apexi ECV.

It can also connect a electrnic controller like the pen type turbo timer apexi have.

-Has anyone got this?

-Is it effective?

-Does it decrease power much?

Any info at all much appreciated.

Thanks,

Phil.

Edited July 10, 2006 by PAV34

[MANWHOR3]

It decreases power ALOT. When the valve is fully closed, if I plant my foot, you can actually watch the revs climb about half the speed as normal and the engine chokes.

It's very expensive.

It doens't help you with exhaust noise test because they'll just open the valve.

It does make it a bit quieter, but not a lot.

your best bet would be to install a middle muff

[PAV34]

ive got a split dump/front, hi flow cat, resonator then the muffler.

should i replace the resonator?

what else could i do to make it quiter without losing performance?

Edited July 10, 2006 by PAV34

[MANWHOR3]

Basically, the resonator doesn't quieten it that much. If you get a nice big straigiht through centre muffler, it will quieten it down a lot.

But keep in mind, no matter what anyone says, acording to the lawsof physics, less noise generally means less power.

[mad082]

But keep in mind, no matter what anyone says, acording to the lawsof physics, less noise generally means less power.

that is only true to an extent. a 3" exhaust on a charade will give it less power than a 2" as it doesn't have a big enough engine to put enough air to fill a 3", but it will be noiser than a 2". it depends on the muffler. if it is just a straight through, perferated pipe muffler it won't affect performance. the cat slows the air down more than a most mufflers (unless they are the winding type that look like a 's' inside).

if you want to quieten down your exhaust put a straight through 'hotdog' resonator in, 1 with the raised holes. this will take out a fair bit of noise, and you won't notice any performance loss. those noise valves even make a difference when they are fully open. they slow the air down so there is a slight loss of performance. as the air travels through the exhaust it swirls slightly. the valve interupts that swirling (even when fully open).

Edited July 11, 2006 by mad082

[PAV34]

will it still have a throaty rb sound though?

where can i find a 'hotdog' in stainless?

thanks for the help.

[benm]

I had a new custom made 3.5" polished stainless exhaust fitted to my car exactly a week ago and its very quiet compared to what I had on previously.

The previous exhaust was a Do-Luck 3.5" cat-back that had a middle resonator and a maaaassive rear canon with 4" tip. The exhaust was soooo loud I couldn't even let my car idle in my garage (detached from house) or driveway because it would make the front/side windows of our house vibrate that's how much it droned.

I had Eddie at Penrith City Exhausts have his way with it and the results are simply incredible. I always thought big hp means big noise but it's not the case if you use the correct mufflers (note I said mufflers and not canons). The canons are pathetic and removing the noise so I had a big oval magnaflow muffler put in the rear and a fairly big magnaflow center muffler added and it's all nice and high off the ground (i'd say 3-4cm higher than the previous exhaust).

It's nice to drive a car that doesn't drone at 110km/h in the motorway and also now I can let it run on the turbo timer when I get home without waking up my neighbours.

[mad082]

yeah cannons are pretty crappy at reducing sound. an oval muffler will always take more sound out. the best are the jasma split mufflers. the pipe comes in as 1 3" then splits into 2 2.5" then joines back into 1 3" then to a 4" tip. thats all just in the muffler. if you look up it you can see split as it is just like an big oval with a partition down the centre.

[benm]

Both my magnaflow mufflers enter 1 side and go diagonally across the muffler and exit the opposite side.

[mad082]

Both my magnaflow mufflers enter 1 side and go diagonally across the muffler and exit the opposite side

that gives a little bit more back pressure (only the tiniest amount) and increases surface area, which increases how well they work. having them at an angle makes the sound particles bounce of 1 side into the other and just keep bouncing the whole way along. think throwing a bouncy ball through a pipe. if it is straight then the ball will just pass straight through. if you put it on an angle then do it it will bounce from side to side. the air still flows through about the same, but the sound is less.

Edited July 11, 2006 by mad082

[PAV34]

hrmmm,

i like the look of the nismo mufflers, cant seem to find a 3" stainless cat back system, or am i looking for something that doesnt exist?

[Ryan1200]

I hav an apexi ecv with elec controller.. took my exhaust (100mm) on a gtr from 105db at 5000 dowm to 92db to clear a defect that i recieved... the valve will only work with it 100% shut... i really didnt like putting that much of restriction on the engine... the motor just didnt feel right driving with it fully closed. then comes the problem with it closing up at high rpm... everything was fine until we started running over 15psi and now we cant keep it from closing up and still hav the use of the electronic controller.... we added extra spring tension to it but affects the controller it attemps to operate the flap and cant so it goes into error a mode... we cant find a happy medium so at the moment its wired fully open and will stay that way...