What is the top MPH you can achieve without replacing the engine? Also what kinda things could you buy to increase the top MPH? So far with AEM intake, and DC headers and exhaust i can get to 115-120ish quite easy, but i want to go higher.

top mph is rpm limited at around 130 . but thats with lots of mods. i can get about 125 with header , intake , exhaust on my xB

I havn't had enough road to go all out. . . but all I gots is an intake. . . and a crappy one at that. . . I've hit about 119, and ran out of road. . . this is in a 5spd. The auto's should have a slightly lower top speed.

Where are you going in such a hurry? You do realize that it takes quite awhile to get to that speed, and that the engine/car/suspension/chassis isn't to happy doin it? Not hatin on you. . . just curious. . . or maybe you're just curious too?

I don't see why top speed should be an issue with an economy car, I wouldn't be going 100+mph on the stock tires. I doubt they were made for that speed.

I thought we had H rated tires, which can handle up to 130mph. . .
http://www.discounttiredirect.com/direct/brochure/info/tmpInfoSpeedRating.jsp

My car topped at 120mph. The engine actually started to shut off. I have a picture on my cardomain site. It's the first pic.

http://www.cardomain.com/id/allblackxb

you shouldn't be driving that fast anyway....hehehe

123mph for me the other day back from Duluth chasing a Pontiac.......
both hands glued to the wheel, stereo wide open with Rush Moving picture, Red Barchette playing..


stock motor, trd suspension kit...

you shouldn't be driving that fast anyway....hehehe

yeah really. Threads like this one start flame wars. just givin you a fair warning. :nope:

I work for lockheed martin. I duct taped on some space shuttle rocket motors and my little xA ended up in the lower atmosphere in just under 2 minutes

I havn't had enough road to go all out. . . but all I gots is an intake. . . and a crappy one at that. . . I've hit about 119, and ran out of road. . . this is in a 5spd. The auto's should have a slightly lower top speed.

well... that auto should have a lower top speed because of more parasitic drag from the tranny... but if you want to talk gear ratios the auto would have a higher top speed if it didnt have a governor and had more power due to the longer final gear (this is also how they acheive statistically better highway mpg).

still though, im not planning on ever going that fast- so it makes having the much shorter gears of the 5spd a much better choice! less moving parts + 1 extra gear for shorter ratios= FUN :D

-jon

Yeah. . . good point on the taller ratio. . .

And out of curiosity, as I don't own an auto, I wonder how it pans out. I know that there will be less whp, from losses, but like you said, there is a taller final gear. So thus, I wonder if top speed would be HP limited (or drag) or if it would be rev limited.

i would guess with as little whp our cars put out, its probably like you mentioned, the 5spd having a higher top speed- because its getting more power and is able to reach high rpms faster... and i doubt the auto would be able to make it to 120+ since it has taller gears (which would require even more power, but its already losing some).

solution: blitz superchargers for everyone!! :D

-jon

HERE HERE

im paying off the last of my debt and getting the Blitz S/C. i think with that and a few other mods ive topped out the 0-60 range with bolt on's only. Im still too new to to major things, but i was hoping to get a higher mph and take it to a track eventually. ( no, not to think its fast, just to show its full potential )

im paying off the last of my debt and getting the Blitz S/C. i think with that and a few other mods ive topped out the 0-60 range with bolt on's only. Im still too new to to major things, but i was hoping to get a higher mph and take it to a track eventually. ( no, not to think its fast, just to show its full potential )

good luck! *major jealousy*

i havent read about a single unhappy blitz s/c owner. from what i can see, its a wonderful unit!

-jon

Hmmm, I thought I read somewhere that the egg and the toaster were limited to 109 by a speed governor. I guess I read incorrectly.

i can vouch for 124-126mph. im hoping for 140mph. Off the line its a great car but once the other car catches up i look like an idiot and get passed

Hmmm, I thought I read somewhere that the egg and the toaster were limited to 109 by a speed governor. I guess I read incorrectly.

That was probably for the auto. . . and I'm not sure if it is a governor, as aero-drag/power limited can often feel like a governor.

But personally, I know that a 5spd can reach over 109, and it seems to be redline limited.

well i drove a breif time over the weekend at 5k rpm for about maybe mile or two with the mods i have on my xA sri header and trd muffler every thing was just humming!!! and not droning sound just humming i was mildly :shock: and surprized :shock: 8)

i think who ever said they got up to 120 our liars couse the govenor shuts you off at 110 , the ony way is to shoot nitrous ,

118 for me so far but i didnt want to push it anymore. had more room but it was shaking like a mofo with the wind from the side . that was stock steelies, Injen SRI, and custom bent exhaust.

Quoting Paul Walker from F&F.... "I need NOS"

:rofl:

not really

Scott

i think who ever said they got up to 120 our liars couse the govenor shuts you off at 110 , the ony way is to shoot nitrous ,

Do you have a 5spd? I'm not aware of any governor. . . only the rev limiter. I dunno. . . in fact, I don't even know what "our liars" means in the first place. . . or "couse."

But I guees from what you say, "the ony way" is to shoot nitrous.

But of course, turbocharging, supercharging, engine mods, wheel diameter changes, aerodynamic changes, swaps, drops, and weight reductions have no bearing on top speed or performance either, as the ony way is with nitrous? Right?

Now don't get me wrong, there is a chance that you know what you're talking about, but your argument isn't very convincing.

Oh, and using nitrous to attain a higher top speed when you are gear limited, is a VERY VERY VERY bad idea. Maybe if you were drag limited. . . but shooting nitrous to exceed your redline is quite possibly the dumbest thing I've ever heard in my entire life. . . ever.

Oh, and if we somehow DID have a governor, and you shot nitrous, you still can't defeat the governor unless you remove it. In fact, you'll probably blow your motor! The fuel would cut, and you'd still be spraying. At that point you'd feel your motor turn into clam chowder.

Unless you change your gear ratios on a gear limited car, you won't change your top speed attainable. . . you'll only get there faster. The easiest way to go faster without swapping your tranny would be to change your wheel diameter, assuming there is enough power left to beat drag. And of course, you would slow your acceleration as well with that approach. Or you could always strengthen your internals, balance your engine, and raise your redline. That would work too.

Stop watching Paul Walker movies and read a book.

The best place to run a top speed test?
I-15 grade, from LV to LA. . . there are some long straight areas that are relatively smooth, and offer the added benefit of a downhill grade.

The best place to be arrested while doing a top speed run?
Read above. You are in plain view for miles and miles, and the joshua trees, billboards, and occasion crests offer perfect locations for NHP/CHP to hide. And I always see people being ticketed and/or arrested on that road. . .

i would guess with as little whp our cars put out, its probably like you mentioned, the 5spd having a higher top speed- because its getting more power and is able to reach high rpms faster... and i doubt the auto would be able to make it to 120+ since it has taller gears (which would require even more power, but its already losing some).

solution: blitz superchargers for everyone!! :D

-jon

I've reached 118mph.

Cya

I havn't had enough road to go all out. . . but all I gots is an intake. . . and a crappy one at that. . . I've hit about 119, and ran out of road. . . this is in a 5spd. The auto's should have a slightly lower top speed.

Where are you going in such a hurry? You do realize that it takes quite awhile to get to that speed, and that the engine/car/suspension/chassis isn't to happy doin it? Not hatin on you. . . just curious. . . or maybe you're just curious too?
not to brag, its stupid to bring it up to high speeds on public roads, but i got it up to 125 ob on the highway, took a hell of a long time, and i have intake header, exh, crank pulley.... but it had speed wobbles like a mo fo... duno though how do s/c xB's go at high speeds?

Yes it is stupid. . . but hopefully if you guys put anyone in danger, it will just be yourselves. . . but even then, you never know.

I've never really had bad speed wobbles. . . my xA seemed pretty solid for such a light car. . . but I've also spent many hours driving 100+. But the scariest thing is your tires. . . if you suffer a blow out, kiss your life good bye. But these cars (with a competent driver whom speeds only on safe, empty roads), is safe to about 90mph. . . anything higher is a gamble, as the brakes/tires are not responsive for evasive action past 90mph. Is the car capable? Sure it is, but these are probably the last cars you want to be doing high speed runs in.

Our cars do have a speed governor. The Xa will shut off at 125. I have shut off my engine many times and it wont kick back on until you back down to about 115. I really dont have a problem with 125, I think it is fast enough. Most people don't have the will to go that fast anyway. I want to get there faster from 80 and up. Hence my new 15Lb NX bottle and kit. It is getting installed Tommorow. So I will have some pics posted. Starting with a 35 shot, maybe up to 50. The kit is capeable of a 75 shot, but you have to be realistic about the 1nz-fe.

i dont know how to do the quotes but djct claims kiss your life goodbye if you get a blowout at 100+. Im gunna go with personal experience and say at 110 at +/- a mph or 2, i suffered a blowout on the stock tire on I680 in Walnut Creek and stopped safe and crash free. Now i will agree that excessive speeding is dangerous, but i tend to do it more often than not.

blowout, meaning that your tires completely blow. . . you were lucky to survive if that was the case. . .

I'm not lecturing people to not speed, just to check their tires. Don't have a cow man. I was just trying to get people to check their tires and be cautious.

And if you've ever taken a logic/reasoning class, you'd know the argument, "well, this ONE time. . . this and this happened" is total bull. On average, a blowout at high speed usually ends in bad things. If you lose a front tire, you won't be able to slow down as fast or steer. If you lose a rear tire, you have an extremely high chance of spinning.

Now I've had a flat at high speeds before, but I don't know if you are talking about a flat, or a blowout.

Our cars do have a speed governor. The Xa will shut off at 125. I have shut off my engine many times and it wont kick back on until you back down to about 115. I really dont have a problem with 125, I think it is fast enough. Most people don't have the will to go that fast anyway. I want to get there faster from 80 and up. Hence my new 15Lb NX bottle and kit. It is getting installed Tommorow. So I will have some pics posted. Starting with a 35 shot, maybe up to 50. The kit is capeable of a 75 shot, but you have to be realistic about the 1nz-fe.

This is the first I've heard of it. . . but I've never been able to exceed 119, where power plateaus. I didn't know we could even hit 125, stock. I don't even remember if the speedo goes that high! What size wheels/tires are you running? Tranny? Year? I want to look into this more.

And how long did it take you to go from 120-125?

i remember getting up to about 118 on I-5 north up to sacramento. it seemed to not want to go faster but i only have exhaust. rode like a champ no wobbles or nothin

i lost the passenger rear. The tire fully shredded off within 2 seconds. It pulled my car from the fast lane to the emergency lane. Luckily the E-Lane was about 30 feet wide due to an up-coming merge. Also going from 120-125 takes about 20 seconds for me and i only have DC exhaust and AEM intake. I was running 17" OZ Superleggera's on 205/40/ZR17 Bridgestone Potenza's

Our cars do have a speed governor. The Xa will shut off at 125. I have shut off my engine many times and it wont kick back on until you back down to about 115. I really dont have a problem with 125, I think it is fast enough. Most people don't have the will to go that fast anyway. I want to get there faster from 80 and up. Hence my new 15Lb NX bottle and kit. It is getting installed Tommorow. So I will have some pics posted. Starting with a 35 shot, maybe up to 50. The kit is capeable of a 75 shot, but you have to be realistic about the 1nz-fe.

This is the first I've heard of it. . . but I've never been able to exceed 119, where power plateaus. I didn't know we could even hit 125, stock. I don't even remember if the speedo goes that high! What size wheels/tires are you running? Tranny? Year? I want to look into this more.

And how long did it take you to go from 120-125?

Sorry about the late reply. I was at the shop while my seats were bieng put in. Since I am lazy I will tell you take a look at my profile for all engine/car upgrades. I have all mods minus Seats and nitrous system posted. It took all of my engine mods and clutch, except for the pulley from perrin, to run the engine to the govener without stressing it to hard. The pulley just made it a little easier. It takes about a little over a mile of good highway distance wise. As for tires falken ZR 215 40 17.

I also took some pictures at Strict Fab during the seat install. I will post them in a few minutes.

never was much of a fan of reading.......

You could find a calculator out there some where what the top speed of the car could be. Here is the things to look at.

Max engine RPM that can be reached +
Tranny Gering/Final Drive +
Over all Tire Size =
Top speed.

The engine can only spin @ xxxxrpm, that alows everything behind that to spin @ what speed they do. So if you can figure out the numbers to go in to there, you can figure out the top speed of the car. Now Im not sure if you would add/subtract/divide/multiply, but those are the things. http://javascript.internet.com/calculators/top-speed-rpm.html is a very simple calculator. It does not take into account the tranny gearing/final drive though. Once you can figure out what the max speed would be possible with the gearing of the xA, then you just need to find out how much HP it will take to get everything to spin @ that rate :doh:

Edit: A much better calculator that takes more things into account. http://www.ring-pinion.com/content/calculators/RPM.asp

Example: With a 4.1 final drive, a 24" tall tire & 110mph speed would get you right around 5051rpm. Now this still does not take into account the gearing of 5th gear, but it gives you a idea.

Ok My wife is about to kill me so I just had time to upload them to my gallery

http://www.scionlife.com/gallery/showgallery.php/ppuser/cat/500

Ok My wife is about to kill me so I just had time to upload them to my gallery

http://www.scionlife.com/gallery/showgallery.php/ppuser/cat/500

Not to bad looking. I love the switch "Go baby Go" I dont like that steering wheel though. I would much rather have one like this http://www.performancecenter.com/graphics/grt/grt_702_500.jpg but hey as long as you like it. Also why have the passenger seat taken out, but have that center console + rear seats still in the car?

Hey HiFi, I'm not doubting you at all! But it is the first I've heard of it. . . and now I know why! It's because our cars don't have enough power to hit the limiter, in stock form. But considering the extent of the work you have done, I understand why you are able to hit it.

the autos ECU might not have a limiter, lots of various toyota products have thatfeature and so do a few nissans. Lots of ppl with 5 speeds switch to the auto ecu for no speed limiter. I don't know if that is the case with the scions, as most cars that you could do this with were OBD1. This is an option once you go FI, I could see the TC being a highway speeds monster

I went with the 1990 Supra Wheel for two reasons. First it is 15 years old so The chances of seeing an authentic Grant TRD wheel in another Scion are slim to none. Second I love to customize everything so I took the old cracked leather ring around the horn button and had a stainless center cap made for it.

And You must pay homage :bow: to the late 80's reflective TRD logo. I'm a sucker for Old School TRD.

that wheel is cool
I haven't seen one of those in a while

not quite feeling the grounding kit, but I do have some ideas

moved to power hungry


scott

i got up to 115
and then i had to turn (freeway, morning after prom)

123mph for me the other day back from Duluth chasing a Pontiac.......
both hands glued to the wheel, stereo wide open with Rush Moving picture, Red Barchette playing..


stock motor, trd suspension kit...

Good Album choice!