NVH Levels in a sierra.

[dull]

G'day, just after some ideas about ways to make the sierra a happier place to be, it's a 95mdl hard top.

What would you recomend to make it a little less noisey on the highway, more/thicker insulation under the carpet? Some sort of spray on sound deadner under the cabin? earmuffs?

Cheers
Dan

[Gwagensteve]

Check the doors are sealing properly, the bailey channel is intact, all the firewall plugs are in place, the gearshift and handbrake boots are in good condition, the unis are in good nick, the exhaust doesn't have any leaks, and that everything is tight.

Make sure the gearlevers aren't in contact with the body etc, it will cause drumming at speed.

Beyond that, obviously you are running road tyres at the correct pressures and the car is properly tuned and otherwise running well? There should be no identifiable gearbox transfer case or diff noise at all.

I have found NVH lowered significantly by lifting the transfer case - this lines the jackshaft up with very little angle and seems to make a huge difference. This has been the case with three cars I have built over the last few years.

However, this isn't really possible without a body lift creating its own problems.

At the end of the day though, a Sierra is a noisy and harsh car. Most of the changes Suzuki did when they built the coil sierra were aimed at making them quieter. They are much smoother/quieter on the road than a leaf car - door seals are better, bailey channel was improved, body mounts changed,

Yes, you can look at thicker insulation etc, but it won't make a massive difference. I run no sound insulation/carpet/rubber at all in mine and it's pretty quiet, but I don't daily drive it.

Steve

[grimbo]

putting some insulation on the inside of the door panel can help as they are a large flat panel of steel that drum away at any sort of speed

[moose]

just do wat i do , turn up the stereo .................LOUD !!!!!

[Gwagensteve]

putting some insulation on the inside of the door panel can help as they are a large flat panel of steel that drum away at any sort of speed

Coiler doors are much better designed to counter this. They were heavily redesigned.

Steve.

[over land 4x4]

ear muff's cheap and eazy
or get that thing into your name so we can take it out

MTFUSB

[Liam]

Get some big simex muddies or swampers, throw away the carpet and insulation and stop being a wuss.
It's a sierra.

[Pyrotech]

just do wat i do , turn up the stereo .................LOUD !!!!!

X2

Get some big simex muddies or swampers, throw away the carpet and insulation and stop being a wuss.
It's a sierra.

x2

a combonation of these two, is the way to go, trust me, thats what i do
32 simex pedes, no carpet, softtop, and a decent set of speakers

[GRPABT1]

While your at it a set of extractors and a 2 inch exhaust

[dull]

Gwagensteve, thanks for all that mate. I'll give it all a good check over on the weekend.

Liam: Yeah, i've got the 32" mongrels begging to be put on, have to pass the RWC 1st.

Pyrotech: I must be showing my age, to much noise from the stereo gives me a headache!

I LIKES ME CARPET DAMN IT!!

It stays till it gets to wet and rotted, nicer under feet.

over land 4x4: Get a new user name, not one that was issued to you on aother forum ya lazy bastard!
It's not going up north till the 25th now, deano is still flat out, so it's turning into a 4day festival/working bee.

Cheers Guys.

[moose]

just do wat i do , turn up the stereo .................LOUD !!!!!

X2

Get some big simex muddies or swampers, throw away the carpet and insulation and stop being a wuss.
It's a sierra.

x2

a combonation of these two, is the way to go, trust me, thats what i do
32 simex pedes, no carpet, softtop, and a decent set of speakers

got both already !!!

[over land 4x4]

there you go dan you with your muff on

[dull]

Thanks for that mate, It's much quieter now..

[over land 4x4]

almos forgot the 32's



and planing a all zook day at paddy's when will you be ready im hopeing there will be more mud this time

[dull]

Well, I really need to get the roady and what not done before I go out again, 2inch lift and 2inch body lift on stock narrow tyres sort of makes me nervous about a roll over!

So it'll be after the 25th of this month. So i'd guess that the 2nd of may might do the job.