SARD Torque Control valve, useless?

[Z2TT]

Hi,

I have seen a product called the Torque Control valve, basically it replaced the catylitic converter and has a varying diameter, the diameter is small at lower RPM and larger at high RPM, apparently this gives more low end power on turbocharged vehicles and helps turbos spool quicker.

Does this really help as I thought for turbocharged vehicles, you can never have too large of an exhaust, or is that wrong. I read posts from a few forum users on some forums who have used it and they say they feel more punch down low.

[abently]

ROFLMAO...... the people who buy this product deserve the results imho lol.

Look at old F1 Turbo engine pics if you need a pictorial answer to your question.

[Draven]

I'm amazed SARD make this.

basically, the ultimate turbo vehicle has a side pipe exiting off the front quarter panel straight out the dump.

I just call bs basically... any benefits that are made from the cat backwards are absolutely minimal. Most benefits are made as close to the engine as possible.

In an n/a engine, extractors is where it's at. with a turbo it makes less difference, but it's still all about close to the engine.

[takai]

Doesnt help with performance, does help with noise restrictions.

[wa5]

if you are caught without a cat on your car, you can face big fines, I have never heard of anyone actually getting fined for this, but penalties do exist.

[Draven]

big is the operative word.

If you think defects hurt, wait till the EPA get on your arse about not having a cat

[wa5]

I have heard the figure of ten thousand dollars bandied around for an individual.

[Z2TT]

I too dont understand why SARD made the product, I was thinking that even though on turbo cars you'd want the least restrictive exhaust, but that would be if you plan to always be on boost i.e on the track, and that for streetability some restriction using the torque control valve would help drivability, yes/no ?

Just thought there had to be a reason behind the product being made, or it's just all bullcrap.

[mullett]

There's a very sound, logical reason for it being made:

The estimated revenue from the expected sale volumes versus the cost of development works out to be a positive number

It reminds me a lot of the 'varex' mufflers, maybe the only real application is for reducing noise, as Takai said?

-RM.

[allencr]

I have seen a product called the Torque Control valve

I be curious.
Link?

[Z2TT]

Here is the link

http://www.nengun.com/sard/torque-control-valve

I emailed SARD asking them about the purpose of the valve, and here is the response :

Hello MR. Boris,

Thank you for the email.

T.C.V. is designed to increase the engine torque at low RPM, because every
car has to have some back pressure at low RPM to increase engine response.

Turbo car, of course straight pipe is the best; however at the low RPM while
the turbo has not yet fully spool up, the engine would still need back
pressure to bring up the speed in order to get the turbo to spool up faster.
And once the turbo is fully spool up the T.C.V. will also be fully opened.
Therefore you will have a free flow exhaust system to help on the top speed.

Also, T.C.V will quiet down your straight pipe exhaust system, due to the
valve design inside the system.

So it looks like at lower RPM when the turbo has not spooled up a smaller exhaust would be better?

[abently]

So it looks like at lower RPM when the turbo has not spooled up a smaller exhaust would be better?

Lol, what a joke... seriously after the header collector, you want ZERO back-pressure in an N/A vehicle..

I'm actually surprised a SARD sales person would even make such a claim due to the very clear legal implications of making a known false claim.

[Z2TT]

I too don't know why they say that, they are trying to say that the increased velocity given by a smaller exhaust at low RPM's will help the exhaust gasses flow out quicker thus spooling up the turbo quicker?

[Cuzzo]

How could more back pressure help build boost?

Wouldnt it then slow down the exhaust wheel?

[abently]

How could more back pressure help build boost?

Wouldnt it then slow down the exhaust wheel?

That's correct. Exhuast velocity across the turbine wheel is directly related to the pressure difference between the exhaust manifold and exhaust system.

This is why Boost comes on sooner whenever you upgrade to a 3" Exhaust system.