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why don't some tires squeel?
I have a 3.6, 915, and 245 rear tires, and will admit I'm overly immature and occasional go for the "burn out" on acceleration.
There is tire smoke, and you can smell the tires, but they don't really make any sound ("squeeling"). Please restrain yourself from explaining how abusive/dangerous/immature I am, I'm just curious why some tires squeel and some don't. Any ideas? -Steve (And I'm drawing a blank on what model tire I have is right now. They are approx 4 year old Bridgestone perfomance tires. Basically worn out now.) |
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Virginia Rocks!
Join Date: Oct 2003
Location: Just outside the beltway
Posts: 8,497
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I always thought that in front engine RWD cars, the squealing was because there was less weight on the tires basically letting the edge of treads skip along the pavement. With the Porsche all the weight keeps them from even spinning. The combination you have allows you to spin, but is pressing down harder on the wheels than if the motor wasn't there.
If you took the same tires and put them on a FERWD car, I bet they would squeal.
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Rosewood 1983 911 SC Targa | Black 1990 944 S2 | White 1980 BMW R65 | Past: Crystal 1986 944 na Guards Red is for the Unoriginal
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Registered
Join Date: Mar 2004
Location: S.E. Pennsylvania
Posts: 1,967
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Are you sure it's not the clutch you smell burning????
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The Fox Carrera |
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Back in the saddle again
Join Date: Oct 2001
Location: Central TX west of Houston
Posts: 56,188
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Nope, I believe the squealing is a combination of a few things, but mostly the first one.
When a tires spins and doesn't squeal it's usually because it is really being abused. Spun really fast. When a tire is just barely slipping on the pavement it will squeal. I think tire compound will also affect the squeal Also, the weight on the tire will affect it. Generally when someone smokes a tire, many revolutions really fast, there's no squeal, just a zhzhzhzhzhzhzhzhzh noise. When I was 16 I had a '65 Impala with a 350, 4spd, and 4.10 gears. If I revved it up and let the clutch out it would spin the crap out of the tires, make lots and lots of smoke, and not squeal. If you hold your foot down until the car gets up to the speed of the tires and they stop squealing on their own you might hear a tiny bit of squealing right before they stop slipping. I generally consider a burnout with tire squeal to be a really weak burnout, and one with smoke and the zzzzzzhhhhhhhhing noise a really good one (or bad if you have to pay for the tires and clutch).
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa ![]() |
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Automotive Monomaniac
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Tire compound.
Some tires are very vocal at the limit, others are very, very quiet (maybe too quiet as they offer little audible feedback). Personally, I hate loud tires. I'd think the higher the treadwear rating, the louder the tire. I know I can really get rental car tires screaming!
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2018 - Porsche 911 Carrera 7MT / 2018 - Porsche Macan 7DCT / 1993 - Cadillac Allante / 2023 - RAM TRX (on order) |
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Back in the saddle again
Join Date: Oct 2001
Location: Central TX west of Houston
Posts: 56,188
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That's in corners. Put those same hard tires on the back of a high horse tire roaster and you won't hear a thing when they hit the gas.
Put those tires on the front of some 17 yo's honda civic and they'll sing like a banshee when he does burnouts.
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa ![]() |
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More Likeable IRL
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why do some tennis shoes squeak only when they are wet, yet other squeak when scuffed against dry ground? its these questions that make me wonder.
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78SC PRC Spec911 (sold 12/15) https://www.youtube.com/watch?v=f7I6HCCKrVQ Now gone: 03 996TT/75 slicklid 3.oL carb'd hotrod 15 Rubicon JK/07.5 LMM Duramax 4x/86 Ski Nautique Correct Craft |
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Senior Member
Join Date: Feb 2000
Location: Lacey, WA. USA
Posts: 25,310
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Rubber compound. Race tires do not make a peep. Street tires do. Especially when they get older.
And BTW, I'm with "The Fox" on this one. Steve, I think you are smoking your clutch. My 911 won't break loose in the way you describe. Instead, the cabin fills with yummy clutch smell.
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Man of Carbon Fiber (stronger than steel) Mocha 1978 911SC. "Coco" |
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Back in the saddle again
Join Date: Oct 2001
Location: Central TX west of Houston
Posts: 56,188
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Yep, my '88 would slip/smoke the clutch, but not really the tires unless I was sliding sideways.
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa ![]() |
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Registered
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> Steve, I think you are smoking your clutch.
I'm very certain it's the tires, per the two long rubber marks on the street (yes limited slip). This is in a 914 and dyno'd RWHP is 235 HP. You can even do it from a rolling start with the clutch fully engaged. -Steve |
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Back in the saddle again
Join Date: Oct 2001
Location: Central TX west of Houston
Posts: 56,188
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Steve, sounds like a fun little car. Sounds like you also need more tire.
![]() Or maybe not, wasn't it Donohue that said when you can leave black marks from one corner to the next you have enough power. Maybe you just have enough power.
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa ![]() |
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John M
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Tire Sqawkn'
Need to take off the bais ply 90 series red stripe tires and replace with real rubber, while de-tuning the awsome P-Car engine to a scant 240 hp or lower to stop the sqawkn'
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"I Can't Drive 55!! |
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Registered
Join Date: Jun 2004
Location: Oakland Twp., Michigan
Posts: 279
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Buy a Mustang. Sorry, couldn't resist. So you can sqwak your tires, why? I don't get it.
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2001 Twin Turbo |
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You do not have permissi
Join Date: Aug 2001
Location: midwest
Posts: 39,934
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Um,....because the cars chassis and powertrain wasen't designed to "burn rubber": because the engineers have configured the chassis to have transfered accelerational forces to the road surface?
(just guessing here.) Next...
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Registered
Join Date: Jan 2005
Location: Sterling Colorado
Posts: 99
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I have not even tried my first 4 months of owning my 81 SC. I thought you were referring to that squeel going around a corner! I cant seem to get the tires to squeel even when cornering hard. Am I not going fast enough? Seems to never even think about not holding the line I give it. Must I try harder?
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Back in the saddle again
Join Date: Oct 2001
Location: Central TX west of Houston
Posts: 56,188
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Bagpiper, you're not trying hard enough. But I'm not advocating you tearing around on public streets at or above the limit.
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa ![]() |
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Registered
Join Date: Jan 2005
Location: Sterling Colorado
Posts: 99
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Thanks Masraum! Hope to see you in about 8 years as I am looking to retire down in the Lake Conroe area. Houses are very cheap compared to Colorado I can pay cash and spend more money on the car!
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