VVT Tuning Noise - ADDED: Comparison Video

[kiichiro]

Uh.
ITS VVT

[AdrianG]

Originally Posted by Dezoris

This motor and countless tunes are quiet during the overlap phase.

The overlap at cold start on the factory tune is definitely not quiet.

Maybe you could post a datalog from your car (which doesn't make this noise, correct?) showing your vvt angles and we can compare with one that does.

- AdrianG

[s2d4]

Originally Posted by Dezoris

I have heard this is multiple tunes, including the Perrin, Vish, and Visconti.

Your issue is placing visconti in the same light as the other 2 thinking there must be something wrong.
I am nearly 100% certain visconti did not play with the cam phasing until shiv posted it up so what you heard with visconti is not the same with the other two.

[Dezoris]

My car has valvetrain noise during overlap on perrin tune. Even more pronounced than Shivs.
This has nothing to do with cold starts. Its about the sound in the videos at specified times at normal operating temps.

[wparsons]

What exactly are you claiming is "valvetrain noise"? Are you suggesting the timing chain is making noise, or the valves themselves are making noises? Just because a noise is appearing from a different cam angle doesn't mean it's a noise being made in the valvetrain. Adding overlap can increase intake noise quite a bit, maybe that's what you're hearing?

I've listened to the sound clips a few times and don't hear anything remotely alarming, so either you're being paranoid, or the clips really don't represent the noise well at all.

[Luckrider]

Runinng Shiv's tunes I can hear a change in the engine noise right around 3800 rpm or so. With e85, the noise is even louder. Comparing the exhaust valve advance on the logs with what I hear, they certainly lineup. The sound has all of the characteristic rasp of an exhaust that has imbalanced pulses.

[mike the snake]

Could it have something to do with the direct injection? My tuner mentioned something about the DI making some serious noise when figuring out how to tune my car.

[86-tundra]

interesting. Always wondered what that noise was.

[wparsons]

I went out for a drive tonight with the windows down to listen for any new noises after flashing with an OFT. There's definitely a noise in the ~3200-4200rpm range, but it definitely doesn't sound mechanical in the valvetrain to me at all. It definitely sounds like rasp, and is more audible at part throttle than at WOT.

[SirBrass]

It's like intake rasp in terms of what it sounds like. It's not noticeable at low speeds, but it is at freeway speeds. That's why I think it's an intake noise.

Either way, if it's normal, then that's cool.

On phone I am. Therefore, if mistakes I make, Frank Oz blame you should.

[Tromatic]

OP needs to a bit more direct in accusing Shiv of being a BS artist.

[JerryMichaels7]

I know what you are talking about.. In both my tunes from fa20club and now e85 from Bill. Its like were the torque dip is in that range of the rpm's, on mine it sounds like my header or OP is rattling to shit. But i checked everything and found nothing, flashed to stock and noise is gone.

[DJCarbine]

Originally Posted by JerryMichaels7

I know what you are talking about.. In both my tunes from fa20club and now e85 from Bill. Its like were the torque dip is in that range of the rpm's, on mine it sounds like my header or OP is rattling to shit. But i checked everything and found nothing, flashed to stock and noise is gone.

Sounds like an exhaust leak almost around 3500-4000RPM right? Like a metallic rattle..... Stock tune doesn't do it, its gotta be the exhaust note due to aggressive cam phasing. Could be why there is a torque dip in the first place, people would complain of the engine note and think something is wrong.

Just my theory of course

[JerryMichaels7]

basicly what I think it is also