tire quandry.. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bigjimzlll · 08-07-2002, 11:34 PM

this is strange...since the new engine

the 255-60s were no match for all of the brute torque.. which is just for what I hoped for. but I will be going to the track this weekend, so I bought some 285-60-15s. same brand..I have less traction with the taller and wider tires, either that or the engine is getting stronger..hmmm that must be it..lol

*Zkast* · 08-07-2002, 11:39 PM

I've noticed on the 295/50R15's on my truck, if I under inflate the tires to 20psi I can break'm loose anytime I please until it hits 3rd.

BUT if I keep them at 32-35 they hook up very nice and give a bassit hound bark while hitting 2nd gear.

What psi are you running in the rear's?

Longhorn Man · 08-07-2002, 11:48 PM

Not only does PSI effect it alot, but remember, if your not on a real good surface, then you're just putting more gravel and crap under your tires.

bigjimzlll · 08-08-2002, 12:13 AM

good point ...never thought of it that way longhorn

Longhorn Man · 08-08-2002, 12:59 AM

If you put wide street tires in the snow...you'd think about it real quick.

ChevLoRay · 08-08-2002, 10:54 AM

The width of the rim affects the contact patch at the pavement. Tires that are too wide for the rim, will have different contact points at the pavement depending on how much air you put in them. It may be that they make contact only in the center, or only at the outer part of the tread, again depending on air pressure. Best way to know, may be to have access to water that you can spray on the tread (paint?) to show the pattern on the pavement at different PSI's. Of course, you'll need a compressor/air tank and a guage that you trust. It's trial and error.

Longhorn Man · 08-08-2002, 12:12 PM

Another way to do that test would be with a large smoth parkinglot.
Do burnouts untill the patch is an even black mark, no heavy black with light black on the edges, nor visa-versa.
You get the even marks by altering the air pressure. Just go a couple pounds at a time.
This is what the folks at good year told me to do a few years ago when i asked about this. I was doing a report for school and had to come up with all kind of tests and answers on tires. It was a butt load of work, but I am educated quite nicely by the pros.

chevyman 68 C/10 · 08-08-2002, 07:14 PM

A quote from Hogans Heros "very interesting"

67 SS · 08-08-2002, 08:19 PM

Hey Longhorn Did the folks at Good Year sell you another set of tires after you burned yours off?

Sinister · 08-08-2002, 08:27 PM

use some chalk on your tires to get the proper pressure, put the chalk across the tread and drive , you'll see what your contact area/patch is, adjust pressure accordingly, soft chalk like the meter maids use is best...
got this out of a 4x4 mag...

bigjimzlll · 08-08-2002, 08:33 PM

not that i needed an excuse for doing burnouts, but now ican tell my wife I HAVE to do them to make it run better...lol.. yea she'll go for that

Longhorn Man · 08-08-2002, 08:47 PM

LOL!!!
Actually, the Citation I was driving was a complete total slug. At least it was loud though...only having an exhaust manifold (not even a header pipe) gave it the cool tune.

08-07-2002, 11:34 PM	#1
bigjimzlll Senior Member Join Date: Dec 2001 Location: Redding,CA...USA Posts: 4,736	tire quandry.. this is strange...since the new engine the 255-60s were no match for all of the brute torque.. which is just for what I hoped for. but I will be going to the track this weekend, so I bought some 285-60-15s. same brand..I have less traction with the taller and wider tires, either that or the engine is getting stronger..hmmm that must be it..lol __________________ It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA

08-08-2002, 12:13 AM	#4
bigjimzlll Senior Member Join Date: Dec 2001 Location: Redding,CA...USA Posts: 4,736	good point ...never thought of it that way longhorn __________________ It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA

08-08-2002, 10:54 AM	#6
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	The width of the rim affects the contact patch at the pavement. Tires that are too wide for the rim, will have different contact points at the pavement depending on how much air you put in them. It may be that they make contact only in the center, or only at the outer part of the tread, again depending on air pressure. Best way to know, may be to have access to water that you can spray on the tread (paint?) to show the pattern on the pavement at different PSI's. Of course, you'll need a compressor/air tank and a guage that you trust. It's trial and error. __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.

08-08-2002, 07:14 PM	#8
chevyman 68 C/10 Registered User Join Date: Feb 2002 Location: Gilmer, Texas USA Posts: 313	A quote from Hogans Heros "very interesting" __________________ 69 Chevy short fleet side soon to have LT1 and 4L60E pb. ps cruise and air. 68 Chevy short fleet side 400 sb 5 inch chop top pb. ps. pw. 350 auto and shaved handles 68 anniversary no engine long wheel base 400 auto FOR SALE 68 Chevy fleet side long wheel base complete parts truck.

08-08-2002, 08:27 PM	#10
Sinister Between Trucks... Join Date: Mar 2002 Location: Los Angeles, CA. Posts: 3,830	use some chalk on your tires to get the proper pressure, put the chalk across the tread and drive , you'll see what your contact area/patch is, adjust pressure accordingly, soft chalk like the meter maids use is best... got this out of a 4x4 mag... __________________ Beat it to fit, Paint it to match...

08-07-2002, 11:39 PM	#2
Zkast Account Suspended Join Date: May 2002 Location: Olathe, Kansas Posts: 929	I've noticed on the 295/50R15's on my truck, if I under inflate the tires to 20psi I can break'm loose anytime I please until it hits 3rd. BUT if I keep them at 32-35 they hook up very nice and give a bassit hound bark while hitting 2nd gear. What psi are you running in the rear's?

08-07-2002, 11:48 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Not only does PSI effect it alot, but remember, if your not on a real good surface, then you're just putting more gravel and crap under your tires.

08-08-2002, 12:59 AM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	If you put wide street tires in the snow...you'd think about it real quick.

08-08-2002, 12:12 PM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Another way to do that test would be with a large smoth parkinglot. Do burnouts untill the patch is an even black mark, no heavy black with light black on the edges, nor visa-versa. You get the even marks by altering the air pressure. Just go a couple pounds at a time. This is what the folks at good year told me to do a few years ago when i asked about this. I was doing a report for school and had to come up with all kind of tests and answers on tires. It was a butt load of work, but I am educated quite nicely by the pros.

08-08-2002, 08:19 PM	#9
67 SS Registered User Join Date: Jun 2002 Location: NW ARKANSAS Posts: 258	Hey Longhorn Did the folks at Good Year sell you another set of tires after you burned yours off?

08-08-2002, 08:33 PM	#11
bigjimzlll Senior Member Join Date: Dec 2001 Location: Redding,CA...USA Posts: 4,736	not that i needed an excuse for doing burnouts, but now ican tell my wife I HAVE to do them to make it run better...lol.. yea she'll go for that __________________ It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA

08-08-2002, 08:47 PM	#12
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	LOL!!! Actually, the Citation I was driving was a complete total slug. At least it was loud though...only having an exhaust manifold (not even a header pipe) gave it the cool tune.



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