what size wheels should i buy for 1994 Q45a

Post by **gode45** » Sat Mar 10, 2007 6:39 am

just purchased a 1994 q45a. im buying wheels for it and i want to go as wide as possible and possibly 18"s. i do not care too much about performance. i do care about not giving up the comfort of the ride. and i do not want to interfear as much as i can with the active suspension. what hve you guys beeen running. thanks

Post by **maxnix** » Sat Mar 10, 2007 7:34 am

Decide on the tire first, then find a wheel that meets OEM specifications and is strong and light as possible.

Post by **3Q Jay** » Sat Mar 10, 2007 9:01 am

welcome to NICO and the only reliable source (thanks to texasoil) of info on the active Q.

if you really care about the ride, DON"T go 18's on your active.

study wheel offsets and fitment. member's rides section has some pics of my dryfitting 18x8 +40 on my active.

Post by **maxnix** » Sat Mar 10, 2007 12:43 pm

Wouldn't even worry about wheels until the rest of the car is restored to as new OEM condition first, especially the active and other suspension rubber wear bits.

Any increase in unsprung weight is going to increase the rate of wear.

Post by **tkd_q45** » Sat Mar 10, 2007 2:36 pm

As Jay states - 18" do degrade your ride - that said, it truely transforms the look of your car and both of us run 18s. If you do go 18" I'd go with 245/45/18 as it give you more sidewall (26.7 vs stock 26"). If you active is working properly, you would have a smoother ride than someone who has a standard suspension. My 94 was an A and was converted to back to standard as I was just not up to keeping on top of the suspension. I did go to CA Custom springs - ride is not nearly as good as it was when my active was functioning normally.

Post by **lino** » Sat Mar 10, 2007 2:56 pm

Welcome to Nico!

What is the mileage on your Q? Is the ACTIVE, ACTIVE? I'm still running the oem tires size on oem wheels. I've been thinking of 245 45 18s. I'm not quite sure yet though. One member here Jeff Williams has 275 35 18s I belive on the rear of his non-active car.

Post by **Rex** » Sat Mar 10, 2007 3:15 pm

Look for 17x8 or 18x8 with 35mm offset.

Tires are key, so make sure you find the right ones to go with the wheels.

Ideally 17's are best, until all the good 17" tires are gone.

Post by **lino** » Sat Mar 10, 2007 4:52 pm

35mm offset for both the 17x8 and 18x8?

Post by **szh** » Sat Mar 10, 2007 6:47 pm

lino wrote:35mm offset for both the 17x8 and 18x8?

That is a good size offset for those wheels.

Z

Post by **Q45tech** » Sun Mar 11, 2007 4:50 am

The active software is written for oem 15" sidewall stiffness AND OEM TIRE AND WHEEL WEIGHT so any change in size will mean an over shoot or undershoot in control.

Just EXPECT that even a BRAND NEW 94Q45a would not behave as designed with different size wheels and tires.

Try to keep as close to oem tire wheel weight as you can a few pounds probably won't matter much but watch out for anything over 17".

A 17" tire is naturally 13.3% stiffer in sidewall from size alone, however the oem tires [15"] were the top of the line [so very stiff] so one might get lucky there! Finding strong enough 17" that are no heavier than oem will be a challenge {FORGED will be required to meet weight limit].

Post by **Rex** » Sun Mar 11, 2007 2:04 pm

lino wrote:35mm offset for both the 17x8 and 18x8?

Yes, remember offset is in relation to width, and (generally) diameter doesn't come into play.

Post by **lino** » Sun Mar 11, 2007 3:54 pm

Q45tech wrote:The active software is written for oem 15" sidewall stiffness AND OEM TIRE AND WHEEL WEIGHT so any change in size will mean an over shoot or undershoot in control.

Just EXPECT that even a BRAND NEW 94Q45a would not behave as designed with different size wheels and tires.

Try to keep as close to oem tire wheel weight as you can a few pounds probably won't matter much but watch out for anything over 17".

A 17" tire is naturally 13.3% stiffer in sidewall from size alone, however the oem tires [15"] were the top of the line [so very stiff] so one might get lucky there! Finding strong enough 17" that are no heavier than oem will be a challenge {FORGED will be required to meet weight limit].

Do have the specs on the 15" sidewall stiffness, oem tire and wheel weight?

Post by **Q45tech** » Mon Mar 12, 2007 3:10 am

Tire stiffness is measure by taking the unloaded radius vs the loaded radius.

A tire with 1000 pounds on it deflects 3/4" thus 1000/0.75= 1333 pounds per inch static..............varies by inflation psi.

This stiffness [spinginess] is inserted into formula with coil springs to befine the real chassis to road stiffness.

The road, the tire, the wheel, the coil spring, the coil spring mount.

Back in 80's tires were side wall stiffer [and need less inflation pressure]...strength of materials vs weight improvements have made possible 51 vs 44 vs 36 psi tires................more air saves weight as long a the ballon is strong enough to survive.

what size wheels should i buy for 1994 Q45a

what size wheels should i buy for 1994 Q45a

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