Celica Forums General Discussion Exterior The power you will need to obtain speeds in the Celica

I came across a very interesting calculation that works out the power needed by a car to obtain certain speeds. It varies for each car because of the different drag co-efficient for each particular body shape. A Celica with stock body kit is as follows

140mph = 190 bhp
150mph = 233 bhp
160mph = 281 bhp
170mph = 328 bhp
180mph = 399 bhp
190mph = 476 bhp
200mph = 544 bhp
210mph = 641 bhp
220mph = 735 bhp
230mph = 838 bhp
240mph = 950 bhp
250mph = 1074 bhp
300mph = 1862 bhp
500mph = 8644 bhp
1000mph = 69,186 bhp

The calculation can be applied to any car. Simply divide the cars speed by the current top speed

so for the Celica to obtain 160mph its 160/140 = 1.14

you then cube the 1.14 giving 1.48

you then multiply the 1.48 by the current power so 1.48 x 190bhp = 281 bhp

Its supposedly accurate to within a few bhp. Interesting though!

1000mph = 69,186 bhp


thats my new goal

Don't forget the high speed tires!

Wouldn't things like weight affect this however?

weight deals mostly with acceleration (why semi trucks have 17 speed transmisons)

but also my 450 pound bike does 130 with no proplem with only 90 hp

that calculation doesn't make sense - that's saying my GT can't hit 140mph? is that right?

I thought the GT's top speed was 130ish?

no. your GT will not hit 140mph. the max speed of a GT is 127mph.

just like the book says

127/140 = 0.907

cubed = 0.746

0.746 x 190 bhp = 141 bhp !!

Pretty clever huh?

Its amazing at top end how much difference a good tail wind makes. If the wind is 40MPH, you can add 30MPH to your top speed.

my head hurts!

My celica has 180 bhp. I can hit 140. You math is flawed. Furthermore, my celica could probably go faster than 140 if I wasn't limited by the fuel cut-off.

i hit 135 in my gt so yah hell yah gts can beat by
that alot

That coefficient is geared towards HP when it should be geared towards torque.

you wannt need the tiers you are then flying

not to mention the rpms will scream past 20k!

Yeah, I've had my needle on 150mph but I'm not dumb enough to believe the car is actually travelling at 150mph. Max speed T Sport = 140mph - 2mph for the GTS and 127mph for the GT.

The top speed is quoted as 127 mph on the GT for a reason. You were not actually doing 135 mph because the speedometer said you were.

The co efficient is geared towards horsepower for a reason. A diesel engine might have 200 lb/ft of torque but a top speed of only 115mph.

The calculation is not my own but was printed in EVO magazine.

how about if you drop it from a plane?? couldnt it reach 100 miles an hour without any horse power??

^^^

This explains why the $20k Honda Insight has so much troubles hitting 70mph... its only got 67hp

I always like this s**t talk about top end, especially in a stock or relatively stock 7th gen Celica. I see no proof of a GTS going over 140. I don't need proof and I know a GT won't go 135 mph. I have said before, that I'm going to give proof. Until my car is ready, I have some suspension problems, then it's on all night until I reach the max.
Our Celica's weren't meant for top end speed anyways. That's like asking a school bus full of children to do the skid pad in .95 G. What about the drag coefficient in the formula? "You" stated before hand, but where is the formula to determine this on top of the gross HP? Is that added on? It can't be. There is a mathematical formula to add to this one.

Cars not meant for top end speed don't have overdrive. All 7th gen celi's have overdrive.

sxyimports125, windspeed has everything to do with the top end of the car. Aerodynamics are the limiting factor. A plane doing 200MPH air speed in a 40MPH tail wind is going 240MPH ground speed. The same airplane flying in the opposite direction at 200MPH air speed with a 40MPH head wind is going 160MPH ground speed. Its simple really. If you have a strong headwind you can deduct the windspeed right off the top of your top end speed of your car. The opposite is true if you have a tail wind.

Go out on a real windy day on a flat stretch of highway that is running parallel with the wind & see for yourself.

Are cars weren't meant for the drag strip. I don't care for overdrive. What the hell is that? A button pushed on auto's for an extra gear? Most cars that I've driven have an overdrive other than manual and that's dating back some years fool. You didn't listen. Read again.

Generally speaking, overdrive (O/D) is the highest gear in the transmission. On most cars the automatic transmission has 3 speeds and Overdrive (forth speed). Overdrive allows the engine to have less rpm with higher speed in order to have better fuel efficiency. When you switch it on, you allow the transmission to shift into overdrive mode after the certain speed is reached (usually 30 - 40 mph depending on the load). When it's off, you limit transmission shifting by third speed.

In normal driving condition the overdrive should be always on.

You may need to switch it off if you drive in mountains area.

The automatic transmission automatically shifts from OD to the 3-th gear when it feels more load. When it feels less load it shifts back to the O/D, but under certain conditions, e.g: driving uphill or towing a trailer, the transmission can not decide to stay in OD or to shift into 3-th speed and it starts to shift back and forth. That's the time you may switch it off and help the transmission to decide.

You also may need to switch it off when you want to slowdown using the engine braking, for example, driving downhill. [For more details, check your owner's manual]


see also...
http://auto.howstuffworks.com/automatic-transmission8.htm

good info

The drag strip and top end speed have nothing to do with each other unless you are running an 8 second car, fool.

do you guys both mean "tool"
...we are talking about automotive stuff, right

That's right ... tool, that's it.

Getting off subject a bit there. I don't think there was anything else to add to the formula. It must be pretty accurate because when I used it with the top speed of 127mph for the Celica GT it came up with 140bhp.

It probably gets a little less accurate over 180mph, but only by a few bhp I should imagine. The wind shouldn't really be considered as a factor nor should driving down a steep hill. A cars true max speed will be found on a perfectly flat stretch of road (one with a nice surface) with no wind. And I'm sorry to say it but with 190 bhp the Celica won't get over 140mph.

no wind huh ... well this is bout as pratical as a lot of physics proplems...

Yah if you are at sea level the air is a lot thicker. Jets are a lot slower at sea level.

yea, and wind doesn't have much effect on the ground. Unless its a hurricane or tropical storm the wind is like 5mph. Who cares about top end speed? We all know it takes like 5 min to reach 120mph. Our cars are slow. Just stick to the back roads, they are much more fun to drive anyway.

I would say my GT would take about a minute at most to reach 120MPH.

Considering there are basically two variations of the 7th Gen Celica, there are a huge amount of conflicting views about top end speed and acceleration on these boards.

A lot of it might be down to the fact that some people insist on bolting crappy looking body kits to what is essentially a nice looking car. God only knows how much a shitty front end like the Blitz must slow the Celica down over 100mph. And people who insist on fitting rear spoilers to the Celica that look like they belong on a fucking boeing 747 commercial jet can kiss goodbye to 20mph off their top end. Performance wise the best thing you could probably do is lower the car as far as you can without effecting ride quality too much and take off the rear spoiler. Making the car look like it belongs to Batman and fucking Robin in my opinion is just ruining a nice car. If you're not happy with the way it looks then you should sell it and buy something that you like the look of from the factory.

Is it just me or is everyone blowing this way the hell out of proportion? He posted a simple relative equation, and yall starting thinking about wind speed, air pressure,elevation, aerodynamics and blah blah

LOOK my GT stock with no engine mods has gone 142. i had it clocked with a radar gun as well. so somethings wrong.

its like in physics there are gonna be certain set constants in the equaiton that are gonna throw stuff off like acceleration due to gravity doesn't take into effect wind or restaince so its only there for a basic view

max speed for a GT is 137.5 mph, not 127...


137.5 is based on stock tires size, final gear ratio and horsepower.

QUOTED OFF THE TOYOTA UK WEBSITE:

The Celica's 1.8 litre four-cylinder engine produces an exciting 140 bhp at 6,400 rpm and 172 Nm maximum torque at 4,200 rpm. That translates into a 0 - 62 mph acceleration time of just 8.7 seconds and a top speed of 127 mph. With the modified engine that powers the exciting Celica T Sport, the figures are even more impressive - 62 mph in just 7.2 seconds and a top speed of 140 mph, where permitted.

i hit 250 in my celica

Exactly my point.

Right on there brother!

I'm still hearing my Gt hit 140 and this and that, but where's the proof? I hit 135 ish in my GTS, but I don't have proof and it took a hell of a long stretch of road to do that in the first place. For me doing it twice will require my car to be at the optimal and no fear of cops because of my trouble with the law before. Plus I need a long stretch of highway road. That I have covered. Who here wants to back it up. Nobody. So it's all heresay. And I know that most talk is crap. Back it up or shut up.
Thanks for the explanation on the auto overdrive Isaac. I do appreciate that.

to those that make outrageous top speed claims, you need to pander that somewhere else. We all own and drive these vehicles and we all know what they will and won't do. save the BS for a different board.

I hit one jillion mph who's gonna argue that?

180 is not the actual crank horsepower of the Celica engine.

How else would N/A Celicas dyno over 180 to the wheels alone?

Actual engine power at the crank is likely over 200 hp.

Most if not all car companies under-rate the output of their engines for legal reasons, and those who don't pay for it sooner or later.

Case and point...The Cobra and RX-8 just to name a few.

It's not very accurate because it doenst leave room to compensate for other factors that play a role in top end but interesting thought none the less. I'd say its got a good entertainment value only.

do YOU even know what your point was?

ok slidr, answer this: how many stock Celicas dyno over 180 whp?