What should I do, ATG? Turbo stuff

[jlee]

I have a TD06 20G & 38mm Tial wastegate that's going on my car - I'm trying to decide between running the dump tube into the downpipe ($150) or going open dump ($20ish).

If I send it through the exhaust, it'll probably sound about like it does now. If I run an external dump tube ('screamer pipe'), it'll sound more like this - (go to 1:05).

I love the sound but I'm afraid it will not only draw attention unnecessarily, but it may also get old after a while...

 

[vshah]

i feel it would get super annoying after a while if it was that loud. is there any power difference?

 

[Toastedlightly]

This is in the MR2, right? (can't watch video, at work). How does the dump sound when you are in the cabin? Its not like you'll hear the wastegate being open for long periods of time.

Just dump it!

 

[jlee]

This is in the MR2, right? (can't watch video, at work). How does the dump sound when you are in the cabin? Its not like you'll hear the wastegate being open for long periods of time.

Just dump it!

Yep, the MR2. For normal daily driving it wouldn't be an issue..just when I step on it hard.

i feel it would get super annoying after a while if it was that loud. is there any power difference?

There should be a slight increase in power with an open dump.

 

[skyking]

The old fogey in me outvotes the young buck when it comes to excessive noise. I go toward whatever is quieter nowadays.

 

[satyajitmenon]

Loud and Proud.
TBH, saw both vids and both sound ok.

I love the sound but I'm afraid it will not only draw attention unnecessarily, but it may also get old after a while...

Well, if it does draw unwanted attention, just flash your cop (get outta jail free) card.

 

[vshah]

or custom fab some sort of switchable option

 

[sdifox]

make it quiet. Then "borrow" the horns from your cruiser.

 

[Elfear]

I vote for the quiet option as well. Loud is fun for awhile but it does get annoying. I guess you could set it up for the open-dump and if it gets annoying just plumb it into the exhaust.

 

[DivideBYZero]

J, I used to have a Forge Dump valve on my WRX. Do NOT underestimate how little boost you need for it to sound like you just released your air brakes... Essentially any build up of boost, no matter how small, will result in a PTSSSSSSSSSSSSSSSSHHHHHHHH when you lift off the throttle.

It got old pretty fast and I put the stock Recirculating unit back on after 2 months.

Caveat: When I was in the mood however it was great fun, sounding like a hooligan!

 

[shabby]

i feel it would get super annoying after a while if it was that loud. is there any power difference?

It'll get beyond annoying, i dumped my full exhaust with a boost activated cutout after the turbo, after a week i disconnected it. It was just too loud and attracted too much attention.

 

[punjabiplaya]

Is there a way to get a switchable system? if not, go for the quiet

 

[stag3]

i voted for quiet, but just get an exhaust cut out so you can route thru the exhaust 99% of the time, and open it up out the side when @ the track

god i miss my mr2 their values are still so fucking high or i would have loved to pick up another one

 

[Zenmervolt]

J, I used to have a Forge Dump valve on my WRX. Do NOT underestimate how little boost you need for it to sound like you just released your air brakes... Essentially any build up of boost, no matter how small, will result in a PTSSSSSSSSSSSSSSSSHHHHHHHH when you lift off the throttle.

It got old pretty fast and I put the stock Recirculating unit back on after 2 months.

Caveat: When I was in the mood however it was great fun, sounding like a hooligan!

He's talking about the wastegate, not the diverter/blow-off valve.

The wastegate diferts exhaust gas away from the hotside under full-throttle conditions to prevent overboost.

The diverter valve (aka blow-off valve) vents excess manifold pressure to prevent the turbine from stalling when there's a sudden lift of throttle.

Jlee: I would run the dump tube back into the exhaust somewhere downstream of the hotside but before the catalysts. That will keep you EPA compliant. An open dump lets exhaust bypass the catalytic converters and can get you into trouble if you ever have to smog the car (I know you don't have to now in NH, but you might move someday). Besides, the power difference is ridiculously small and while I'm certainly no tree-hugger, it just seems silly to bypass the cat for even a small bit of the exhaust considering how effective they are at reducing pollution.

ZV

 

[jlee]

Jlee: I would run the dump tube back into the exhaust somewhere downstream of the hotside but before the catalysts. That will keep you EPA compliant. An open dump lets exhaust bypass the catalytic converters and can get you into trouble if you ever have to smog the car (I know you don't have to now in NH, but you might move someday). Besides, the power difference is ridiculously small and while I'm certainly no tree-hugger, it just seems silly to bypass the cat for even a small bit of the exhaust considering how effective they are at reducing pollution.

ZV

Ah, good point - I didn't think of that.

 

[yhelothar]

i voted for quiet...
then watched the vids.. now i think i'd vote for loud
the loud has a nice sounding note.

 

[DivideBYZero]

He's talking about the wastegate, not the diverter/blow-off valve.

The wastegate diferts exhaust gas away from the hotside under full-throttle conditions to prevent overboost.

The diverter valve (aka blow-off valve) vents excess manifold pressure to prevent the turbine from stalling when there's a sudden lift of throttle.

Jlee: I would run the dump tube back into the exhaust somewhere downstream of the hotside but before the catalysts. That will keep you EPA compliant. An open dump lets exhaust bypass the catalytic converters and can get you into trouble if you ever have to smog the car (I know you don't have to now in NH, but you might move someday). Besides, the power difference is ridiculously small and while I'm certainly no tree-hugger, it just seems silly to bypass the cat for even a small bit of the exhaust considering how effective they are at reducing pollution.

ZV

Ahh, yeah, OK, missed that he was talking about the wastegate, I watched the video, heard the VTA dump and ASSumed he was talking about that.

I still say dump it into the exhaust. Dumping to atmos would also bypass the Oxygen sensor, right?

 

[ayabe]

Voted quiet, your car sounds great as it is.

The alternative is borderline too much for me, but I would have to hear it from the inside to make the final call on that. You will definitely get some people saying "what the hell is that?!" from a 1/2 mile away

 

[sjwaste]

I'd go quiet. Loud exhaust in general gets annoying after a while. I'll take you for a ride in my Supra if you don't believe me.

That said, you can buy a switchable diverter.

http://www.quicktimeperformance.com/QTEC/index.php

I'm sure you can rig that up for the wastegate plumbing.

 

[jlee]

I'd go quiet. Loud exhaust in general gets annoying after a while. I'll take you for a ride in my Supra if you don't believe me.

That said, you can buy a switchable diverter.

http://www.quicktimeperformance.com/QTEC/index.php

I'm sure you can rig that up for the wastegate plumbing.

Oh I believe you - my car had an Apexi n1 on it when I bought it. This would only be loud under WOT/peak boost, though - not the same as the perpetual ear-battering from a loud exhaust.

 

[imagoon]

One thing to think about, wastegates can leak a little and during long drives of little boost (say highway) they can actually draw atmosphere (cavitation effect? can't recall the name) in to the system and melt the cat due to the exhaust being to lean. I personally don't like the noise (and smell at times) and preferred to plumb it back to the exhaust system.

 

[ayabe]

I can't think of a single car where an N1 isn't obnoxious, such better choices out there.

 

[jlee]

I can't think of a single car where an N1 isn't obnoxious, such better choices out there.

It was one of the first things to go.

 

[jlee]

Update..settled on running the wastegate dump into the downpipe. I had to buy another turbo adapter since the one I had was garbage.

Now I need to find gaskets, buy bolts, and install everything. I just got an offer for a ROM tune (re-flashed ECU) for $350, which is pretty cheap. Needs a re-tune for my setup ($100). Also need a fuel pressure regulator ($75), but other than that, I should have everything:

TD06 20G turbocharger
Machined adapter for stock exhaust manifold
Braided steel oil feed / drain lines
38mm Tial wastegate
3" downpipe w/wideband bung
540cc injectors
ATS Racing bored fuel rail
Walbro 255 fuel pump
Innovate LC-1 wideband with gauge
Greddy Profec b Spec II electronic boost controller

And last but not least, a VMax quick ratio steering pinion (to bring me from 3.2 turns lock to lock down to 2.6).

 

[basslover1]

He's talking about the wastegate, not the diverter/blow-off valve.

The wastegate diferts exhaust gas away from the hotside under full-throttle conditions to prevent overboost.

The diverter valve (aka blow-off valve) vents excess manifold pressure to prevent the turbine from stalling when there's a sudden lift of throttle.

Jlee: I would run the dump tube back into the exhaust somewhere downstream of the hotside but before the catalysts. That will keep you EPA compliant. An open dump lets exhaust bypass the catalytic converters and can get you into trouble if you ever have to smog the car (I know you don't have to now in NH, but you might move someday). Besides, the power difference is ridiculously small and while I'm certainly no tree-hugger, it just seems silly to bypass the cat for even a small bit of the exhaust considering how effective they are at reducing pollution.

ZV

Only true enthusiasts go cat-less...:whiste:


Besides, a few WOT passes should get the turbo hot enough to burn any extra fuel.