i was driving to san diego on sunday for work and i was late so i was trying to go really fast and i got a big open stretch of road and wanted to see how fast my car would go with my awesome SPFR intake. yeah, i know it only adds 1 HP, but i have heard reports of people not being able to go past 110mph, so i just laid on the gas to see what would happen. well, even though it was kind of at a slight incline, the speed just kept going higher and higher. my wheels are 16" but the tires are smaller and lighter than stock so i know the speedometer was off. it past 120 like it was nothing and kept going. i was only watching the RPMs after that, since engine speed is constant for what gear you are in, no matter what size your tires are. suprisingly the car remained very smooth and stable the whole time. no shaking or anything. i would have backed off if it started making noise or vibrating wierd. but it never did. well, the tach passed 6000 and i kept going to see if there was still a rev limiter in 5th gear. yep. there is, and around 6400 or so, the engine cut out until the revs dropped a little. since i was still floored it quickly went up and hit the limiter again. by then, i knew what was going on and i let off the pedal and slowed down to a more respectable speed. i don't condone this kind of driving, but i was running late so it was ok. i just thought i'd let you guys know that 1.42whp really does seem to make a difference.

wow now imagine if you had the AEM intake WOW..

Strange? everyone said 5k in fifth was the rev limiter round 110-115 mph or so. i dont want to try it out sorry! :oops:

with my awesome SPFR intake. yeah, i know it only adds 1 HP,

i just thought i'd let you guys know that 1.42whp really does seem to make a difference.

hahaha man, we are never going to hear the end of this.

awesome Eric! I've never had it up that fast, but my 1hp SPFR intake sucks just as bad as yours I'm sure. :lol:

ya know if you were a noobie i wouldnt believe one damn word you were saying...but since you are a valid poster and exsperienced with this automobile.....all i have to say....i bet it was fun and i wanna do it too

wow now imagine if you had the AEM intake WOW..
Strange? everyone said 5k in fifth was the rev limiter round 110-115 mph or so. i dont want to try it out sorry! :oops:

maybe my speedometer is way off, i don't know. all i know is that it went up to 6500 in 5th gear. and the reason i posted this is so you guys DON'T try this. i just wanted to let you know where the limit is.

BTW, i tried to reach the top speed in my WRX after it was all modified, but i got scared at around 145-150. they say the gearing allows it to go up around 170, maybe more with a strong enough engine and the right wind conditions. once you get past 120, there is a tremendous force of the air on your car that doesn't allow you to go faster unless you have a lot of power.

ya know if you were a noobie i wouldnt believe one damn word you were saying...but since you are a valid poster and exsperienced with this automobile.....all i have to say....i bet it was fun and i wanna do it too

haha. i'm not lying. but seriously, don't try it unless you at least have good tires. the stock ones are rated at 85mph and are not safe above 90. actually, what i did was probably not safe at all. i shouldn't have even posted it, but oh well. i already did. be safe you guys, i just had 2 subaru friends die this weekend. my friend and i put a lot of hours into making his car really fast (he had a lot of money), so i feel partially responsible. very sad.

http://www.nasioc.com/Uploads/accident.jpg

eric, what kinda rims do u have?
i thought u had the grids in 15's on ur bag setup?
but i could be totally wrong. anywho.
how fast were u going do u think? when it hit the rev limiter?

what are the specs on your tires? you could probably use that one program on the saturn website to see how off your speedometer was.

that must have been going pretty fast.

BTW, i tried to reach the top speed in my WRX after it was all modified, but i got scared at around 145-150. they say the gearing allows it to go up around 170, maybe more with a strong enough engine and the right wind conditions. once you get past 120, there is a tremendous force of the air on your car that doesn't allow you to go faster unless you have a lot of power.



When my DSM was stock..i took it to round 155-160 then i got scared... it sounds like a whole lot more than 145-150.. but its not.. anything over 120-130 feels pretty much the same stuff just flys by faster. Either way, no more going that faster for again. I'm surprised that the WRX wouldn't let you take it up that high stock.. maybe because it's not as aerodynamic as the the 2g smiley bumper DSMs?

sorry to hear about your friend eric, that really sucks.

sorry about your friends eric....that is really a bummer....

eric, are you still running 205/40/16?

nice!!!! :bow:

i i know the speedometer was off. it past 120 like it was nothing and kept going. AWESOME!! It's good to know our leetle box-cars can PERFORM!!

Now you need to go to the nearest CHiP officer and turn yourself in . . . you SCOFFLAW!!!

:silly:

... engine speed is constant for what gear you are in, no matter what size your tires are... .
Not so. The overall wheel diameter, or more accurately the rolling radius, affects rpm. Imagine how the rpm at any mph would be raised if you could bolt on little 12" trailer wheels.

... i have heard reports of people not being able to go past 110mph, so i just laid on the gas to see what would happen... it past 120 like it was nothing and kept going....
Top Speed [mph] 103
http://scion.jbcarpages.com/xB/2004/index3.php

xB — MAJOR TECHNICAL SPECIFICATIONS (Scion Tech Manual, pdf file)
Max. Speed km/h (mph) 165 (103)
Max. Cruising Speed km/h (mph) 145 (90)

My car shakes above 70mph (stock tires). I did make it to 110mph, however!

You SoCal guys drive fast down there on normal freeways. I was just down there on vacation back in August and freeways down there are from 80-90mph mostly on open freeways. Geez...

yea 80 is about normal speed down here. Funny thing is, for some reason its the SUVs that are driving like maniacs.

... i have heard reports of people not being able to go past 110mph, so i just laid on the gas to see what would happen... it past 120 like it was nothing and kept going....
Top Speed [mph] 103
http://scion.jbcarpages.com/xB/2004/index3.php

xB — MAJOR TECHNICAL SPECIFICATIONS (Scion Tech Manual, pdf file)
Max. Speed km/h (mph) 165 (103)
Max. Cruising Speed km/h (mph) 145 (90)
103 is not top speed.

Speedometer isn't very accurate over 100mph. You were probably doing 110 and it said 120.

i hit a governor on my 04 at 118mph, where it wasnt "maxxing, or rev limiter" where i actualyl felt the engine drop rpm.

i know i maxed mine out on highway 101 from san fran to san jose... usdmbb told me that my wheels are off about 5 miles but never confrimed ..mine did the same thing just made a overrev sound and doesnt let ya go anymore i only did it once to see how long it takes and if my i/h/e does anything...it took me a bit time to get there lol..but yeah its possible to do well over 100 ....

... i have heard reports of people not being able to go past 110mph, so i just laid on the gas to see what would happen... it past 120 like it was nothing and kept going....
Top Speed [mph] 103
http://scion.jbcarpages.com/xB/2004/index3.php

xB — MAJOR TECHNICAL SPECIFICATIONS (Scion Tech Manual, pdf file)
Max. Speed km/h (mph) 165 (103)
Max. Cruising Speed km/h (mph) 145 (90)
103 is not top speed.
It's like, does Scion ever actually get in the car and run it up to top speed, before publishing such bs?

eric, what kinda rims do u have?
i thought u had the grids in 15's on ur bag setup?
but i could be totally wrong. anywho.
how fast were u going do u think? when it hit the rev limiter?
If it's geared the same as an xA 5spd, it's about 127, that's as high as the xA is geared to go stock....3500rpm at 70 4000 at 80 4500 at 90 5000 at 100 6000rpm at 120... I figured out that about 127 is the top for a 5spd xA about 130 is the geared limit for an Auto xB.


***All #'s are for stock vehicals.***

... an xA 5spd.... 3500rpm at 70 4000 at 80 4500 at 90 5000 at 100 6000rpm at 120... I figured out that about 127 is the top for a 5spd xA....
That is around the redline. Does the car reach redline in 5th? Or do the car's power and drag equal each other at something less than 127 mph?

the GOV kicks in at about 120, it 2 miles on the freeway to find that out.

In another thread, Tomas posted a page from a Scion manual with a table that showed the speedometer is allowed to read around 4 mph fast at 60. I can see on my ScanGuage that the engine computer says my xB car is going 56 when the speedometer indicates 60.

That would be 8 mph fast at 120, meaning that 120 would be 112. The factory gives the top speed as 103, so the best we can do should not be greatly faster than that. I would believe 110 - need to try it myself and see what my ScanGuage says vs the speedometer reading.

The computer is programmed with the car's factory tire diameter and knows the true speed based on that, while the speedometer is calibrated to read high so people won't blame it for making them speed.

there is NO speed limiter

and it is not 103 mph top speed drag or governor limited.

The computer is programmed with the car's factory tire diameter and knows the true speed based on that, while the speedometer is calibrated to read high so people won't blame it for making them speed.


no. it is the possibility of the speedo mechanism being not exactly linear to the actual speed , and the possibility of the needle being installed incorrectly.


my car's speedo is dead on for sure between 40 and 70mph. so I would assume it's correct or close to at higher speeds.


every car is different.

i hit a governor on my 04 at 118mph, where it wasnt "maxxing, or rev limiter" where i actualyl felt the engine drop rpm.nope. the scions are not such equipped.

Top Speed [mph] 103
http://scion.jbcarpages.com/xB/2004/index3.php

xB — MAJOR TECHNICAL SPECIFICATIONS (Scion Tech Manual, pdf file)
Max. Speed km/h (mph) 165 (103)
Max. Cruising Speed km/h (mph) 145 (90)
103 is not top speed.
What leads you to say that?

... the speedo mechanism being not exactly linear to the actual speed , and the possibility of the needle being installed incorrectly. my car's speedo is dead on for sure between 40 and 70mph. so I would assume it's correct or close to at higher speeds... every car is different.
Your car sounds very different. At 60 mph, my speedometer indicates 4 mph faster than the reading that my ScanGuage is getting from the computer. This fits with the large cumulative error that others have noted below, summarized as:
1. The little 60 series tire inputs extra revolutions which makes the speedo read 3-4% faster than the 65 series bB tire it was designed for.
2. The speedo is then cablibrated to specs that require it to read an additional 3% faster than the input.

... Speedometer is 4-5% fast, as it is on many other cars too.
http://www.scionlife.com/forums/viewtopic.php?t=136044&highlight=speedometer

... the Scion xB... speedometer error, about 3-4 percent optimistic with the 60 series tires...
http://www.scionlife.com/forums/viewtopic.php?t=68648&highlight=speedometer+error
... the service manual for the xB specifies that the speedometer be calibrated so that it reads about 3% too fast.
http://www.scionlife.com/forums/viewtopic.php?t=136044&highlight=speedometer

The computer is programmed with the car's factory tire diameter...while the speedometer is calibrated... no....
My ScanGuage is displaying a speed taken from the diagnostic port of the "computer", which is multiplying a tire diameter by the revolutions to get a speed.
And the speedometer is "calibrated" with gears of a specified number of teeth to show a speed.

wow...the fastest i got in my xb was 108.after that i got sacared and let off.when i had my 04 maxima i did 135 and i still wanted to keep going but cops scared me that time not the car.....i gotta say ....past 85 these xbs feel like they are gonna fall apart.im running df210's with stock rims and tires.how can i fix this little problem.or ist it normal?

My Box easily goes over 100 MPH, no shakes or vibration. You really can feel the wind pushing the front. It easily does over 90MPH with the windows down too. I sure surprise a lot of those SUV monsters when I pass them...lol

Don't worry too much about the tires. The law requires a vehicle's tires to be rated for its maximum speed or higher, and similarly it is illegal to mount replacement tires on a vehicle with a speed rating lower than the stock ones. The stock xB tires are "T" rated, which is 118 mph. The rating is based upon 30 minutes at that speed, but of course depends upon tire wear, inflation, and driving conditions.

i guess it is just the wind.the aerodinamics of this thing suck.that is what i feel when i got over 90.the wind pushing my but around.

I have to try it now... i have 1000 Miclia rims with 215/35 18 W rated Yokohama Parada Spec 2 tires. I have had mine up to about 95, and it is extremely smooth. I love these little boxes!

there is NO speed limiter

and it is not 103 mph top speed drag or governor limited.
I call BS, I hit the gov/speed limiter at about 120 (118-120).

:no:

My box shakes at 105mph. (don't ask how i was drivin). But I felt it was too dangerous. As for a limiter? does it has one :doh:

I've heard some "blockheads" (loving term...from an egghead) talking about their gov. Can't remember what mph it is tho. I can find out tonight.

Top Speed [mph] 103
http://scion.jbcarpages.com/xB/2004/index3.php

xB — MAJOR TECHNICAL SPECIFICATIONS (Scion Tech Manual, pdf file)
Max. Speed km/h (mph) 165 (103)
Max. Cruising Speed km/h (mph) 145 (90)

bull, the day I picked mine up I had it to 110, I've had it at and around 115 - 120 probably a half dozen times in the past year, and yes I know running above 75 is a no no with a non broken in engine, atleast I do now, but mine is still running just fine, and I've not done any engine mods

You SoCal guys drive fast down there on normal freeways. I was just down there on vacation back in August and freeways down there are from 80-90mph mostly on open freeways. Geez...

:silly: My '06 auto likes 80 and will do it all day @3500 rpm. Keeps you from getting run over by the SUVs!

My xB speedo reads 8 % fast at all speeds, so 120MPH is actually 110MPH on my car.

i don't condone this kind of driving, but i was running late so it was ok.
:P :silly: :P :silly: :P :silly:

All this guessing as to speedometer..I've got a Magellen Colorstreet pilot GPS in mine and the speedo is nuts on up to 85 mph..haven't been any faster yet but now I'll have to give it a go. I'd better take the 2x4's off my roof rack 1st.

Mike