Today I was headed south on I-75 and decided to see what she's got. I was cruising at about 70 when I got the wild hair, so I stomped on the pedal and about 1 min later I was cruising at 95 mph and about 4500 rpm. With the pedal to the floor she wouldn't get to 100 nor would she redline. Capital WTF.

 

What did you have in your xB? Are you heavy set? Did you know your car is not aerodynamic?

 

True. Car & Drive tested the xB up to 103mph & said that is the top speed because of aerodynamics. Maybe you live above sea level enough to kill your top speed some. :?

 

I've had my box up to 115, so car and driver is wrong

 

I got my xB to 110 on the highway a few nights ago...

 

Also different driving techniques. Gradually add pressure and sometimes relieve some pressure on the accelerator instead of flooring it. There's something about air/fuel mix ratio that contributed to the low MPH, I think. But I'm not even an amateur on that subject so someone should fill in.

 

May be a dumb question, but were you driving into the wind? We have a pretty constant wind here in Lincoln, so when I drive home from work I have to work the engine just that little bit harder. On the other hand, I have had my car to 95, it was pulling harder, but it's not nearly as stable at speed as my Corvette or my old Mercedes, so I stopped right there.

Mike R.
rolex87

 

To those who have gone over the 103 I said.. How do you know that the speedo is 100% right on? Im not sure how C&D gets there info, maybe a GPS tracking thing that can track your speed better then the speedo can. Maybe it was a bad day when they tested it. To many things that can play into this. Also the xB they tested was loaded up to something like $18,xxx so it had a great deal more weight to it & a auto.

 

I'm thinking, it's a box. On wheels. But a box. So the wind has to play into the top speed.

As an old ad with Jackie Stewart would have said about the xB, 'This is not aerodynamic'.

And the size of the engine. Not very large. Maybe it's a combo of reasons.

 

I had my auto box up to 110 on the way to Atlanta last month... i don't have any engine mods at all.

I wanted to get it all the way to 120, but it only went to 110 give or take 1 or 2 mph

 

well..to answer a couple questions , I only had myself and my 110 pound wife in the car and no cargo. It may have been a little breezy but during some stretches I was going slightly downhill which I thought would counter act it. Seriously though I also tried accelerating slowly which in reality would mean for about 3 or 4 mins till pedal was all the way down. Now I do have the stock 18" rims and my gas mileage is only 24 mpg, so I wonder if they didn't calibrate my speedo and I was actually going faster. But the key here is that in 4th gear the box wouldn't let me redline. If there were a mod to allow that it would be sweet.

 

I have an auto xB w/ 18's and it's slow as F%&# ! ! I've never been over 95, even on a trip to vegas! I once thought that I might be baby-ing the car too much, so I floored that _____ on the freeway. I was already doing 80, so I thought I would at least hit 100... Nope. It was more like

80.........81.........82.........83.........84

Geez! It took forever just to get to 90! At that pace I felt I would blow it up if I kept trying! So I said the hell with it, I just cruise the slow lane now!

-THE DON

 

looking at the poll results is funny

 

Alright, I have DC headers, Blitz Exhaust, and AEM cold air intake... on i87 last week I floored it and I couldnt push past 100mph... and it was just me in the car. Im going to try again tonight on my way home from work, Id be satisfied if i could crack the century mark.

 

160MPH in your box!!!!

this is how you could do it for real,take a cat shot off the deck of a u.s. navy carrier and l know you go 160,170 mph,but you aint going to enjoy the stop!and then the boat will more than likely run you down if you float at all. u.s. navy aviation 63-67.
FLY NAVY!!!!!!!!!!

 

its definately only the automatics that have this low speed problem. it must be the added weight of the tranny, and the power consuming automatic. cuz i have a stick with intake & exhaust, and 18's. i've been too 110 easily, and still had alot of pedal left. i backed off at 110 cuz it was gettin scary

 

???????

umm, are yall doing something wrong?

my auto box with no engine or wheel mods got up to 110 easily .... ??


Maybe it's something to do with outdoor temp/humidity, elevation, or something?

 

The wheels have a lot to do with it... I'm rockin' 18" chromes on 225/40/18's (yes they rub) and as soon as I put them on I could feel the difference.

 

Navy sucks....AIR FORCE AIR FORCE!

 

I know some of the NRG crew in Philly have taken their boxes up to 120 I think (two of them are stick the other one auto).

Personally I have an auto XB and have gone as fast as 110-115 without any problems. I have no engine mods and have 18's....So i dont know.. :D :D

Just my 4 cents!