Q Ship! MASSIVE Pictures, at last!!! 56K god hates you.

[Mark86T]

damn you, haven't i taught you anything!???!

If you paint them...paint them BLACK!

good job on resizing them... my goodness...

we might have to go do a photoshoot of the family cars and whenever you get the blackhole (z31) up and running, maybe we can get some on-track pictures of you trying to catch up to Homer

Pics would be cool, but me thinks you may be the one attempting to catch my black beauty/beast. As for the calipers, I will paint them body color. SILVER METALLIC!!

[Mark86T]

These are unsafe ratings for a heavy car like the Q (over 4000 lbs) - it is the dynamic load values under braking and acceleration that will give you problems. Your values are probably for "max psi" loading.

You need at least 95 rated tires (1521 lbs) or more (according to Q45Tech) if you do not use strong tires (like Michelins).

Otherwise, a very nice look!

Z

Damn Discount Tire!! They neva mentioned anything about that! I've been buying from them for years! Gonna have a talk with them soon. Thanks for the info.

[Mark86T]

Jesda, thanks again for all your help getting my pics hosted!!! Mark

[elwesso]

Looks nice.

I have a 10in sub in my trunk too, but I bet mine was cheaper!

[Mark86T]

Looks nice.

I have a 10in sub in my trunk too, but I bet mine was cheaper!

Doubt it. Can you say FREE!! Free sub & got the amp (400 watt) FREE from my lil bro. Box cost me about $50! Can you beat $50 for a sub, box & amp? Nuttin better than free. I want to upgrade to a 12" sub soon. 400 watt amp is too much for the 10". What kinda amp you running?

[elwesso]

Yes I can, I got my sub, amp AND box FREE

$30 for the wiring including a $20 set of wire strippers!!

I have a kenwood 240 watt amp, MTX sub, in a ported box, its VERY bassy.....

[Mark86T]

Don't ya just love FREE?!

[VmaN!]

Hey Mark nice car =D Did you take those pics at lake las vegas?

[rsiwicki]

http://www.nissaninfiniticlub....ating

Mark.....the above thread explains load rating in good detail. See Q45techs comments especially. I went through the same thing when I started looking at wheels/tire combo.

[Mark86T]

Hey Mark nice car =D Did you take those pics at lake las vegas?

Thanks! Yes, some of the pics were at Lake Las Vegas. And at a park in Henderson. Where is Vegas you located?

[Mark86T]

http://www.nissaninfiniticlub....ating

Mark.....the above thread explains load rating in good detail. See Q45techs comments especially. I went through the same thing when I started looking at wheels/tire combo.

Thanks, I appreciate it. 4,000lb cars are new to me. I've only ever had Zs.

[VmaN!]

Ya lake las vegas is really nice, doesn't even seem like you are in vegas there. The atmosphere there is that of another city/country. I'm in the Silverado area, near eastern off the 215. How about you?

[Mark86T]

N. East. 95 & Charleston.

[szh]

Let's see if my math is working.

His car, with him in it, probably 4400lbs at WORST.

front tyres have a load rating of 1,433 lbs each rear tyres are 1,323 lbs each.

1433x2 = 2866lbs for the front axle1323x2 = 2646lbs for the rear axle.

total load rating of 5512lbs.

5512lbs > 4400lbs.

the car is probably front heavy, hence the higher rating for the front axle. Let's assume the car has a 60/40 weight distribution.60% of 4400lbs is 2640lbs40% of 4400lbs is 1760lbs

As we established, the front load rating of the tyres still have close to 200lbs of room...with the rear nearly a 1000lbs. Obviously, the weight over each axle will differ based on the actual weight distro.

You brought up an interesting point of braking. Under normal braking, maybe 10-50lbs is moving. Under hard braking, potentially a few hundred pounds.

Problem is, these tyres won't be genetrating god awful amounts of braking G forces, where they would exceed the load ratings of the tyres to become an issue...

Now, if he ever trailers anything with it, he might have a problem.

Way too simplistic a calculation, I am afraid. You are not taking into account the tire pressure typically being well below MAX PSI (load rating drops with lower pressure) and when the car hits a bump, or a simple pothole at high speeds ! You need a lot more margin of load support that these load index values can provide.

Remember that the load index ratings are at maximum cold inflaiton pressure. For example, a tire rated at 95 load index is 1521 lbs when the tire is at is 36psi and must be down-rated at lower pressures.

I have detailed load index tables (available for $70 from the US Tire Manufacturer Assocation) that I will extract information from to show what happens to load index with decreasing pressure. (I am using a 215/65-15 tire - the old Infiniti OEM value - for these. The tables are actually far more detailed for other tire sizes and XL tire types).

So here is the derating for a few load index values (the first is is his rear tire and the second is his front tire and the third is the minimum recommended for a Q45) as a function of tire pressure:

Load Index 26 28 30 33 35

90 1,014 1,058 1,146 1,235 1,32393 1,102 1,146 1,246 1,345 1,43395 1,168 1,224 1,323 1,422 1,521

The bottom line is that with his current tires, he has no room for error whatsoever. With these tires, I would:

1. return to Discount Tire and get them replaced - they should change out the tires at no cost for their ineptitude.
2. increase the pressure to 38-40 psi cold inflation pressure (if the tire is a 44 MAX PSI tire) or even 44 psi (if it is a 51 MAX PSI tire with soft sidewalls). Makes for a rougher ride though.
3. check his cold tire pressure every morning - before the sun has warmed them up.
4. never let tire pressure drop too low.
5. pray that the car never hits a pothole at speed![/list=a]
   
   Z

[szh]

As a first blush set of info, here is the ETRTO load index table (not tire size specific, so they should be taken as a first step info only):

TIRE LOAD CARRYING CAPACITY (LBS) AT VARIOUS PSI Load Index 26 28 30 33 3680 761 794 860 926 99281 783 816 882 948 1,01982 805 838 915 981 1,04783 827 860 937 1,003 1,10284 849 882 959 1,036 1,10285 871 915 992 1,058 1,13586 904 937 1,014 1,091 1,16887 926 970 1,047 1,124 1,20188 948 992 1,069 1,157 1,23589 982 1,025 1,113 1,202 1,27990 1,014 1,058 1,146 1,235 1,32391 1,047 1,091 1,179 1,268 1,35692 1,069 1,113 1,213 1,301 1,38993 1,102 1,146 1,246 1,345 1,43394 1,135 1,190 1,290 1,378 1,47795 1,168 1,224 1,323 1,422 1,52196 1,202 1,257 1,367 1,466 1,56597 1,235 1,290 1,400 1,510 1,60998 1,268 1,323 1,433 1,543 1,65399 1,312 1,367 1,488 1,598 1,709100 1,356 1,411 1,532 1,653 1,764101 1,400 1,455 1,587 1,698 1,819102 1,444 1,499 1,631 1,753 1,874103 1,488 1,554 1,676 1,808 1,929104 1,521 1,598 1,731 1,852 1,984105 1,565 1,642 1,775 1,907 2,039106 1,609 1,687 1,819 1,962 2,094107 1,653 1,731 1,874 2,006 2,149108 1,698 1,775 1,918 2,061 2,204109 1,742 1,819 1,973 2,127 2,271110 1,797 1,874 2,028 2,182 2,337111 1,852 1,929 2,094 2,249 2,403112 1,896 1,984 2,149 2,315 2,469113 1,951 2,039 2,204 2,370 2,535114 1,995 2,083 2,260 2,436 2,601115 2,061 2,149 2,326 2,502 2,678116 2,116 2,216 2,392 2,579 2,755117 2,182 2,271 2,469 2,645 2,833118 2,238 2,337 2,535 2,722 2,910119 2,304 2,403 2,612 2,800 2,998120 2,370 2,480 2,689 2,888 3,086

[maxnix]

Damn Discount Tire!! They neva mentioned anything about that! I've been buying from them for years! Gonna have a talk with them soon. Thanks for the info.

Yeah, they did that to me and Tirerack did it to some members here also. I actually was asked to leave my Costco tire center when I asked them to air my tires to 35 psi, and proceeded to explain very politely why it was necessary for the weight of the car. Guess I shouldn't have done it in front of customers.

The best was the Discount guy who said load ratings didn't matter. Could I have that in writing, sir?

[HondaCRX]

You are not taking into account the tire pressure typically being well below MAX PSI (load rating drops with lower pressure) and when the car hits a bump, or a simple pothole at high speeds ! You need a lot more margin of load support that these load index values can provide.

For a normal, average, typical motorist... i would whole heartedly agree with you.

But, we're speaking about a good friend of mine.

I can almost guarantee these tyres are pumped to just under Max PSI... (ie. 2-3lbs under). Also... potholes + High speed + las Vegas /= Real World.

You'll be hard pressed to find a pot hole in Vegas... let alone one that would require speeds greated than 35mph. People complain about the slick roads of Vegas... except, the roads in California are much worse, in terms of smoothness.

Bumps and uneven surfaces are one thing... since there's plenty of road construction in Vegas... However, Mark tends to drive his car AROUND virtually everything in the road. He avoids lane markers!!

I trust his extraordinary level of awareness in his car, so these setbacks won't be "issues".

Of course, he can always get new tyres.

and Zana... as ugly as it is... remember it! You're gonna see it at the AutoX and the road course!

Drag racing... well. i might have to just let you win that

[maxnix]

For a normal, average, typical motorist... i would whole heartedly agree with you.

But, we're speaking about a good friend of mine.

I can almost guarantee these tyres are pumped to just under Max PSI... (ie. 2-3lbs under). Also... potholes + High speed + las Vegas /= Real World.

Unfortuantely the above does not exempt your friends from the laws of physics. The tires are under the rated load carrying capacity, and more importantly, if they fail or contribute to an accident in which he is involved, the lawyers will be all over him like white on rice.

Do read the relevant Q45tech posts. Dynamic performance gains in tires are not necessarily attained with wider rubber on larger wheels, but by increasing the load bearing capacity of each tire, all other tire characteristics being equal.

[Mark86T]

I will check with Discount tire. But I am running 44psi which is the max pressure. I don't think it makes the car too stiff. More responsive is what I call it. Thanks for the advice.

Quote »and Zana... as ugly as it is... remember it! You're gonna see it at the AutoX and the road course!

Drag racing... well. i might have to just let you win that [/quote] Well I'm coming for ya! Drag racing should be a slam dunk. The road course seems doable. The autocross is the only one I'm not sure about. The larger the course, the better for me. Ain't competition great!

[HondaCRX]

Unfortuantely the above does not exempt your friends from the laws of physics. The tires are under the rated load carrying capacity, and more importantly, if they fail or contribute to an accident in which he is involved, the lawyers will be all over him like white on rice.

damn the laws of physics.

well, all four tyres blew. We were riding in the Q ship, 3 guys in the car (200lb, 180lb, 160lb, respectively)... the Q ship hit a lane marker and ripped one tyre to shreds...drove over a bowling pin, tyre number 2, gone.

tyre 3 and 4 went on vacation shortly after driving over two potholes and a tic tac.

[szh]

If you are not joking ("bowling pin"?, "tic tac"?), then you guys are lucky indeed! I hope no one was hurt in any way.

If you are joking, then <shrug> ... just remember that you are ignoring advice from people who have owned Q's for years (13 years in my case) or the ultimate in experts (Q45Tech) and we think we know what we are talking about. I have done my homework when it comes to tires ... load index tables and all.

Be safe.

Z

[ardvarkus]

Damn Discount Tire!! They neva mentioned anything about that! I've been buying from them for years! Gonna have a talk with them soon. Thanks for the info.

They should replace them for free... it is a legal liability for them to install sub-rated tires on a car.

[HondaCRX]

If you are joking, then <shrug> ... just remember that you are ignoring advice from people who have owned Q's for years (13 years in my case) or the ultimate in experts (Q45Tech) and we think we know what we are talking about. I have done my homework when it comes to tires ... load index tables and all.

Be safe.

Z

I'm just poking fun... and agree, to a point, about your concerns.

However, i'm not an engineer or some technician... just a guy who races cars and uses personal (and other people's) experience to determine what is good and what is not so good.

by the way, my point with the poking fun was, he's been on those tyres for a few weeks... not a single issue. Is that to say nothing WILL happen, nope. But, the laws of physics don't take breaks

[1992Q45A]

I love that black interior...

The wood trim is in great shape, it looks very rich and real... I like the wood they used on the middle console on the 94s and up

Mark,

We should try to get together for some Q pics when I'm in Vegas..

The Nevada Highway 318 events are identical, differing only in the time of year. They begin just South of Lund, at White Pine County just north of mile marker 9, head South through Nye County, and finish at Lincoln County mile marker 7.

Not sure how far that is from you..

[Mark86T]

I love that black interior...

The wood trim is in great shape, it looks very rich and real... I like the wood they used on the middle console on the 94s and up

Mark,

We should try to get together for some Q pics when I'm in Vegas..

The Nevada Highway 318 events are identical, differing only in the time of year. They begin just South of Lund, at White Pine County just north of mile marker 9, head South through Nye County, and finish at Lincoln County mile marker 7Not sure how far that is from you..

I'd love to get together for pics & stuff. Just let me kno when you are coming. I'm not familiar with the Highway 318 event. I'd have to check how far I am from those spots. I'm here in vegas. Just let me know.