N(VH) increase - 305 tires vs susp mods

[GT 550]

Hi folks, looking for some informed opinion about the cause of a road noise increase. About 3000 miles ago I changed rear tires from stock to 305 (PZero) and about the same time installed Steeda RLCAs and rear shock mounts, and FRPP knuckle bearings. Steeda claim no NVH increase from the the RLCA bearings but from what I'm reading here some people feel the RLCA bearing does increase NVH.

Either way the noise is quite intrusive on coarse tarmac surfaces although it remains quiet on smooth surfaces, the increase is a no brainer but the difference is huge. I would expect increased noise from wider tires and at least some of the the suspension mods as the latter replaces bushes with bearings, but I'd appreciate hearing from anyone who's maybe just fitted wider tires or the susp mods and can comment on the noise change.

Car is a DD and I'm thinking of taking out the RLCAs but there's no point if it's the tires.

Cheers and TIA

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[BmacIL]

If you changed to the same tire, just wider, it's not the tire (unless it is an XL rated vs SL rated on the stock ones).

Every set of bearings I've added increases noise. Not so much general road noise, but noise from bumps and ruts is louder. I expect the same from the RLCA bearings. It is a relatively serious modification for those who favor handling and precision and don't mind the tradeoffs for NVH.

 

[bootlegger]

Pzeros should be quite quiet, unlike SC2, R888R, or RE71R. Just changing the width won't add much road noise, though I am guessing you will add a small amount going from 40 to 30.

 

[moarhorsepower]

Add some of this to your trunk. Makes a big difference in road noise (even quieted down the differential lockouts that are currently on my car). Don't need a ton, just the spare tire wheel well and surrounding bare metal.

https://www.amazon.com/Noico-Deadening-Automotive-Restoration-Insulation/dp/B01BKKZ1AM/ref=sr_1_4?crid=3RD8SVG1AM0G&keywords=noico+80+mil+sound+deadener&qid=1556799815&s=gateway&sprefix=noico,aps,121&sr=8-4

 

[ForYourOwnGood]

There is night and day difference between my stock 235/50's and my MPSS 305/35's. The wider tires sound like wooden barrels rolling down the road even with the above mentioned insulation in the trunk.

 

[moarhorsepower]

There is night and day difference between my stock 235/50's and my MPSS 305/35's. The wider tires sound like wooden barrels rolling down the road even with the above mentioned insulation in the trunk.

It's funny...supposedly the Michelins (PSS and PS4S) are supposed to be the quieter of the tires in the same class/performance range. Don't get me wrong they aren't the quietest but it was liveable to me. Adding the noise insulation just helped tone it down a bit further.

 

[bootlegger]

There is night and day difference between my stock 235/50's and my MPSS 305/35's. The wider tires sound like wooden barrels rolling down the road even with the above mentioned insulation in the trunk.

Wait until you hear a road-legal track tire.

 

[ForYourOwnGood]

Wait until you hear a road-legal track tire.

I've had them before, but the cars were generally stripped out so it didn't matter. I wasn't trying to drive them an hour to work listening to the radio.

 

[bootlegger]

I've had them before, but the cars were generally stripped out so it didn't matter. I wasn't trying to drive them an hour to work listening to the radio.

I have just decided to turn the stereo up to fix the issue. LoL

 

[ForYourOwnGood]

I have just decided to turn the stereo up to fix the issue. LoL

Now thats my kind of problem solving.

 

[BmacIL]

I have just decided to turn the stereo up to fix the issue. LoL

Or make your exhaust louder.

 

[Lightning Struck]

My 325 PS4's are night and day quieter than the SC2's were

 

[Performance nut]

Or make your exhaust louder.

I think BmacIL just suggested you get a pair of hookers...

 

[GT 550]

Thanks everyone for the more, er...technical replies. I tried two hookers but they couldn't stand the road noise . Anyhow...

Add some of this to your trunk. Makes a big difference in road noise (even quieted down the differential lockouts that are currently on my car). Don't need a ton, just the spare tire wheel well and surrounding bare metal.

Thanks for the suggestion, I've actually used Dynamat and it's taken the edge off the roar but it's still intrusive on some surfaces. Also have some noise blocking blanket on the floor of the trunk which helped but again it's not great.

There is night and day difference between my stock 235/50's and my MPSS 305/35's. The wider tires sound like wooden barrels rolling down the road even with the above mentioned insulation in the trunk.

Very interesting, that's exactly what mine sounds like. Do you have any added susp bearings?

 

[moarhorsepower]

Thanks everyone for the more, er...technical replies. I tried two hookers but they couldn't stand the road noise . Anyhow...

Were they dead hookers? Because then they wouldn't complain...

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