how much would it take for a 400 to hit 80?

[quad_man08]

well someone i know has a 400ex and one of my friends rides with him and said that he hit 80 over whoops....so he says it will probly hit 90 top. how much does it take to get a 400 to hit 90 or even 80.... all that i know that he has in it is pipe, jet kit, airfilter, hotcam, and a 426 kit so i dont think itll hit those speeds. maybe 75-80 tops

[brapbrap13]

all about gearing.

[TravEX]

Higher rev box, serious motor mods, 16/36, and 22's would do it, BUT I doubt you could get enough power to pull that gear to that speed from a 400EX.

Travis

[ITSTOCK]

45+ horsepower and the right gearing.

90mph on it??? HIGHLY doubtfull, nearing impossible. Tell him to take a vid with GPS though, I'm not saying it IS impossible.

[oldskoolex400]

without rev box running 15t front 20in rears i hit 76 last winter idk about 90 mph sounds a little much i havent tried toping it with the sparks box and 16t front

[firefighterjosh]

I have a banshee. (See below for mods) and I got clocked at 92MPH. If a 400ex with the mods you said can keep up with me in accleration and top speed. Then I would.....Hmmmm be very impressed.

[465Rider]

I think high 80's and possibly 90+ is possible with a fully modded 400, I know mine is blown out to the max, no mor mods to be done execpt a nos bottle, I'm turning 75+ with 15-38 gearing, 18" mx tires on the back. It's not good though, to be winding 400's out to 90mph, it's going to blow sooner rather than lator, dun that already, but I think 90mph is doable. If you wanna drag race the 400 is not the machine to buy.

[firefighterjosh]

Originally posted by 465Rider
I think high 80's and possibly 90+ is possible with a fully modded 400, I know mine is blown out to the max, no mor mods to be done execpt a nos bottle, I'm turning 75+ with 15-38 gearing, 18" mx tires on the back. It's not good though, to be winding 400's out to 90mph, it's going to blow sooner rather than lator, dun that already, but I think 90mph is doable. If you wanna drag race the 400 is not the machine to buy.

75+???? I don't mean to bash ya but that is hard to belive. The only thing I can think of is a full blown motor with a Turbo charger and NOS.

It takes alot of mods to get a Banshee to 80 HP let alone a 4stroke 400.

[465Rider]

Originally posted by firefighterjosh
75+???? I don't mean to bash ya but that is hard to belive. The only thing I can think of is a full blown motor with a Turbo charger and NOS.

It takes alot of mods to get a Banshee to 80 HP let alone a 4stroke 400.

I'm not getting into a bashing contest, I mx race mine, not interested in the top speed like I use too, the 400 cases are not made for high mph. I hit the rev limiter at 10,100rpm, I know that's close to 80 with my set up, 400's will rock your world if they're built right, but they're not desgined to go 90, if you wanna drag race it, you better cryogenic metal treat the cases.

[TRXman86]

my father in law has a 750 Shadow, me and him hauled *** down the road one day to see what i could hit. i dont know what was done with motor, bought used. i had 20" HS with stock gearing. she was screaming and started to rattle valves at 79. when let of i was at 81. it can be done! i had a blaster that hit 70 with .10 over bore, Toomey B-1 full set up, with 20's. nothing is impossible. all machines are different. no matter if built back to back. yours may, his wont, mine and another guy will. dont matter.

[465Rider]

Originally posted by firefighterjosh
75+???? I don't mean to bash ya but that is hard to belive. The only thing I can think of is a full blown motor with a Turbo charger and NOS.

It takes alot of mods to get a Banshee to 80 HP let alone a 4stroke 400.

400's will hit 100mph on pavment with a turbo, running on nos, but like i've been saying, if your into drag racing the 400 is not the machine to buy.

[phildogg]

with enough power and right gearing anything is possible..
phil

[PismoLocal]

If you had a flat road that was a couple miles long I bet all you would need was a piped,cammed,carbed,ported,polished, 460 stoker with a 16 tooth front and a 36 rear sproket with 22's out back. lol

edit: It would also have to be running around 12-13:1 compression with nitrous.

[swva400ex]

its about the gearing but you got to have the power to pull it.

[firefighterjosh]

I am not just talking Top Speed. My banshee could do 200 mph if I had 20 Miles and something to give me a bump. For a 400 to have good acceleration and top speed of 90 would be a hard task.

[465Rider]

Originally posted by firefighterjosh
I am not just talking Top Speed. My banshee could do 200 mph if I had 20 Miles and something to give me a bump. For a 400 to have good acceleration and top speed of 90 would be a hard task.

A fully modded, stroked 400 running on meth, nos and turbo charged, in the 1/8 mile against a drag banshee, would be a good race, we need more of them, the banshee should win, but not by much. The original post was, " can a 400 do 80-90mph", the asnswer is YES.

[firefighterjosh]

If the banshee was a Full Drag banshee I think the banshee would kill it.

[465Rider]

Originally posted by firefighterjosh
If the banshee was a Full Drag banshee I think the banshee would kill it.

I don't know dude, the banshee's have been getting spanked on a regulare basis at old's hill(Glamis) by the four strokers.

[firefighterjosh]

maybe by a 450 but not by a 400

[†2005 400ex†]

That depends on how modded the 400 is.

[quad_man08]

ok that is what ive told him. well he had a gps and it said it hit 80 but ya.....i dont think so

[skull2002]

i have a 04 400ex. jetted dead nuts on, hmf pipe, k&n, w/outerwears. radared at 72 mph, have the blue copy of ticket for proof!and i dont mean after 4 miles of downhill straightaway! gears and motor are stock.im 5'10 and 250 also. so im sure with some engine mods, 85+ is definitly attainable.

[newrider4002001]

i got clocked at 75-80 on my 400 ex by my dads truck at the old airport and it didnt take me more then a quater mile to hit it

[400exstud]

Originally posted by newrider4002001
i got clocked at 75-80 on my 400 ex by my dads truck at the old airport and it didnt take me more then a quater mile to hit it

Not with that 14T sprocket you didn't:p !

[c.mcd]

a cheetah cylinder'd banshee with some other mods will pull close to 100hp... thats at the motor no the rear wheels. i dont know i just thought that was interesting....its in the dirt wheels novemeber issue if anybody wants to take a look

[northwest Texas]

I could possibly buy the argument that your bud thinks it will hit 90mph. Most people on quads really embelish on the speed thing so I always take that with a grain of salt. I could care less of top mph, has no importance to me.

The thing that tells me your bud is full of poo is he was doing 80mph over the whoops. I'd have to call BS on him.

[400EX QUADER]

A stroker cheetah on alcohol with drag pipes and alot of porting can hit 115hp+. Have the 4 strokes been beating the nice tripple banshees or for that matter a banshee over 110hp?

[400EX QUADER]

oh and i'm talking about rear wheel hp's. Even a cheetah cub on racegas with drag pipes and porting, etc could easily be over 100hp.

I think you would need 45+hp to do and tall gearing and maybe bigger tires. Some 450s can hit 90+mph and a 400ex can be made powerful as a 450 so i think it could easly be dun.

[slower]

hahahaha

http://www.exriders.com/vbb/showthread.php?s=&threadid=263240

[krt400ex]

Originally posted by slower
hahahaha

http://www.exriders.com/vbb/showthread.php?s=&threadid=263240


umm, i am going to take an educated guess....ur the same guy with just the er added to ur name....what did that post have to do with this thread?


i think a 400ex will do 80, but i dought it would be able to do more than that unless it was on alchohol and/or nos

[newrider4002001]

Originally posted by 400exstud
Not with that 14T sprocket you didn't:p !

no it was b4 i bought this sprocket. i hate this sprocket im putting my old one back on dont know what it was but it gave me more topend

[Kaleigh]

the bigger the front sprocket the more topspeed.. when you change front sprocket.. ever tooth in the front is equal about 4 in the back..

[400EX QUADER]

3 in the back...

[krt400ex]

Originally posted by 400EX QUADER
3 in the back...


actually, if u want to get really technical, it is 3 1/2 in the back

[400EX QUADER]

oh really?? if thats true, good info.

[krt400ex]

Originally posted by 400EX QUADER
oh really?? if thats true, good info.


ya it is true...


hahaha, i just thought i would join the banwagan...lol

but ya that is true

[400EX QUADER]

where did ya learn that?? Never heard 3.5 before...

[quad2xtreme]

Originally posted by quad_man08
well someone i know has a 400ex and one of my friends rides with him and said that he hit 80 over whoops....so he says it will probly hit 90 top. how much does it take to get a 400 to hit 90 or even 80.... all that i know that he has in it is pipe, jet kit, airfilter, hotcam, and a 426 kit so i dont think itll hit those speeds. maybe 75-80 tops

Tell me his gearing and tire size and I will let you know the RPMs. I say BS. The reason...if he is running on a track, then he isn't likely to be running a 36 on the front with a 38 on the rear...and he isn't likely to be running anything larger than 20" tires.

Basically, 16/38 gearing with 20 inch tires is 10,000 RPM for a whopping 88.7 MPH. Your friend is talking like a weather forecaster...he means it feels like 90...not is 90. :rolleyes:

More likely scenario is 15/38 gearing with 20 inch tires at 9,000 RPM = 74.8 MPH.

/Jon

[krt400ex]

Originally posted by 400EX QUADER
where did ya learn that?? Never heard 3.5 before...


MXA

[flauge]

he means it feels like 90...not is 90.
Man, I think all atv's should come with speedos just so people would stop guessing:scary: . A buddie of mine at work says his 450r will go 110mph stock:o Hes dead serious too, thats whats funny..

[400EX QUADER]

Originally posted by krt400ex
MXA

Moto crossers anonymous???

[flauge]

/\ lol

[Def-e-nition]

Lol ! 90mph ??

Bugger that . These guys can go all gearing crazy - I say No way .

And Ill stick with my answer .

I can get it to do 116 mph Down an unused Mineshaft . Bring it , we'll show you . :D


Weather forecaster - he he he that was funny .

[krt400ex]

Originally posted by 400EX QUADER
Moto crossers anonymous???

so maybe u don't like the mag, but my buddy who also owns a performance shop told me the same thing.

BTW- everything that i have read in MXA and had a chnce to test and see for myself has been right on par with what they said. so i know they r not a faulty mag

[exrider2001red]

[

Basically, 16/38 gearing with 20 inch tires is 10,000 RPM for a whopping 88.7 MPH.



/Jon [/B]


is this true cause if so i know which mod im doing next to my bike

[quad2xtreme]

Originally posted by exrider2001red
is this true cause if so i know which mod im doing next to my bike

It is totally true; however, you won't have the hp to actually pull this gearing all the way to 10,000 RPM...that was kind of my point with the BSrs.

[Knowpig]

Originally posted by flauge
Man, I think all atv's should come with speedos just so people would stop guessing:scary: . A buddie of mine at work says his 450r will go 110mph stock:o Hes dead serious too, thats whats funny..

That's funny $h!t.
110.
Bwaahhahahahahah.

[Kaleigh]

Originally posted by quad2xtreme
It is totally true; however, you won't have the hp to actually pull this gearing all the way to 10,000 RPM...that was kind of my point with the BSrs.

What if you went to road tires were the tread has less resistance.. do you think you might be able to pull it off then.. I know it makes a hude difference on my bicycle and car.. My snow tires dont let me go that fast on dry pavement..

[quad2xtreme]

Originally posted by Kaleigh
What if you went to road tires were the tread has less resistance.. do you think you might be able to pull it off then.. I know it makes a hude difference on my bicycle and car.. My snow tires dont let me go that fast on dry pavement..

Anything you can to reduce drag will help including using a chain with no o-rings or x-rings. Lighter axle, hubs, wheels, tires, and shaving any other weight off the rider or quad will help.

The real problem with the 400ex in near stock form is that it was never meant to have maximum hp at higher RPMs.

/Jon

[exrider2001red]

what is stock back sprocket for the 400ex

[PismoLocal]

38

[Honda4lyphe]

techinally..who cares? unless your drag raceing i can see a point but if your a regular track/trail/dirt rider your not going to go over maybe 45 to me its all in acceleration but ya in drag raceing i can see how top speed affects..fact is a STOCK 400ex will do anywhere between 62-70 depends on the rider's weight and expirence and how the bike was broke in new. To me if you could pull of 70 on a stock bike it shouldnt be too hard to mod it to 75-80 but 85-90-100...thats a whole nother story.

[ridfastorbelast]

ive had a 400ex i hit 78-80, with it and i had a white bro slip on, dj 146 jet kit, and a 16t front sproket and 38 back and 20inch tires

ive tried with 16-36 but it wasnt strong enought

for the 250 $ i put in my quad I was really hapy to smoke all the 450r and follow raptor 700 with a 400ex

my other friend that put cam, dmc full complete pipe,jet kit k&n,carb, and 16-35 sproket hitted at 89

my friend had the same same jetting but had a complete pro cicuit pipe and a k&n he hit 84 with it. it really fast

if u know what ur doing youll get it done, if u know ur bike youll make it


my friend has a dvx and know alot about quad and he make 80mph on a police radar the highway. so know your quad and youlll make it hapen


sry my grammar im french lol

[firefighterjosh]

Originally posted by ridfastorbelast
ive had a 400ex i hit 78-80, with it and i had a white bro slip on, dj 146 jet kit, and a 16t front sproket and 38 back and 20inch tires

ive tried with 16-36 but it wasnt strong enought

for the 250 $ i put in my quad I was really hapy to smoke all the 450r and follow raptor 700 with a 400ex

my other friend that put cam, dmc full complete pipe,jet kit k&n,carb, and 16-35 sproket hitted at 89

my friend had the same same jetting but had a complete pro cicuit pipe and a k&n he hit 84 with it. it really fast

if u know what ur doing youll get it done, if u know ur bike youll make it


my friend has a dvx and know alot about quad and he make 80mph on a police radar the highway. so know your quad and youlll make it hapen


sry my grammar im french lol

Wht did you clock it with?:ermm:

[ridfastorbelast]

2 cars and 1 truck... for all the ex

dvx clock by police radar



if u know what ur doing.. youll b able to get 80mph with not alot of parts

[oldskoolex400]

how do you have to know what your doing to get the top speed? all you have to do is shift and press the gas, theres not much skill in that......

fully built 400ex =52hp
+NOS= over 20hp
+turbo = about 25hp

total = around 100hp 400ex which should beable to hit over 90mph.


You could add a jet engine like that alba raptor on alba.com and go even faster.

[Stein2088]

Originally posted by quad_man08
well someone i know has a 400ex and one of my friends rides with him and said that he hit 80 over whoops....so he says it will probly hit 90 top. how much does it take to get a 400 to hit 90 or even 80.... all that i know that he has in it is pipe, jet kit, airfilter, hotcam, and a 426 kit so i dont think itll hit those speeds. maybe 75-80 tops


either i missed the quote or i think everyone needs to slow down (when reading).... " "well someone i know has a 400ex and one of my friends rides with him and said that he hit 80 over whoops...." " over whoops??? please mayb he did hit 80 and mayb we should consider that hitting 80 over whoops is insane also impossible now mayb he went into them at 80 cuz someone added a whop section on a long flat road but i go to a lot of races and i have yet to see any track where speeds reach near 80 let alone anyone with enough balls or engine to take whoops/go through them at 80, so lets be realistic top speed sure top speed on any MX track going through whoops????

Nick

i ran into down hill woops 4th gear on my ex un expectintly and it felt like it was going to rip my arms off.

[Honda4lyphe]

Originally posted by slow
i ran into down hill woops 4th gear on my ex un expectintly and it felt like it was going to rip my arms off.

haha sounds fun

but seriously..getting your ex to 80 shouldnt be that hard with a good pipe and proper jetting, might not go exactly 80 but pretty damn close..

[blown331]

I raced my buddies 95 mustang gt from a roll on... when i let off he had me @ 69 mph... and i was tucked and pegged

i'm 195lbs so someone lighter may be able to pull a few more mph out of it

[oldskoolex400]

i got 78 on a 15t sprocket 20 in rears stock rev box on a 55 degree day

[Honda4lyphe]

Originally posted by blown331
I raced my buddies 95 mustang gt from a roll on... when i let off he had me @ 69 mph... and i was tucked and pegged

i'm 195lbs so someone lighter may be able to pull a few more mph out of it

do you have any engine mods? if not that thing was broke in great!

[lil p]

how fast should a stroked 465 with over valves, over carb, 13.5:1 piston, port, stage2 hotcam,sparks e6 full pipe, k & n , runing alchohol be???????????

[parts eeter]

We gps two 400s both with extensive mods and reached 72.9 best mph on dirt roads tapping the rev limiter.

[oldskoolex400]

parts eeter-- is that the 400 with the stage 1 cam in it? thats cutting a few mph out of it right there

[parts eeter]

I realize this and I also have it geared for woods and have the stock rev limiter in place cuz I luv my quad and prefer the crank to stay together.I sold the stage 3 cam I had and used a woods cam instead.I am sure with gearing changes,rev box and race fuel we could squeeze out near 80 mph runs but I didnt even like going 73 mph.I save the 180mph runs for my GSXR 1000 and keep my quad pullin stumps.Just info for you guys to use for your own spending.

[blown331]

my 400 is bone stock at the time it had very bald tires. of course this was on the street and might be +/- a few mph.

Only TRUE way to get a 100% on the speed is by GPS. I'm going to be getting one of the small gps units soon. Good to know while boating too :)

[riles88g]

it wouldnt take much at all. mine does 72 bone stock. do a little gearing and ull be set

[atvnut22]

my bestfriend has a 400 with only a pipe, no lid, and jetted, and my other buddy was followin us in his ranger, he said him and the guy on the 400 was doin 73...whenever i left them, haha:D

[omeeomy]

my bro inlaws 416 was dynoed at 85 mph on the dyno so yes its possable but to be doing 80 over the whoops id love to see that
hes either full of b.s. or hes got some big ole brass ones lol

Fastest 400ex I had been on was 86MPH on GPS. 440 stroker done up. +1200rpm? rev box. on a 05 i believe it was 16/38 or 39. Idk it was rediculous to be going that fast on a atv. It was a blast to give other 440 big bores a head start and just haul arse past them. Over whoops never happen to be doing 80mph. 70mph is a stretch too and even 60mph over whoops is crazy. I have hit the rev limiter in 5th over whoops but the wheels will come up and thats when it would hit the rev limiter so it was not top speed that you could hit on flat ground where your tires are always making contact. Ever ride a waverunner? same thing you can be going fast accelerating then you hop up and it revs out and slows down speed wise from not being in the water

[atvnut22]

wait, by whoops did they mean, like whoops as in hills, or whoops as in medium sized rocks, OR possibly, whoops as in im goin over whoops at 80, WHOOPS this is a mistake, haha

[Snipe]

I smell a 3 year old thread lmao.

[atvnut22]

Originally posted by Snipe
I smell a 3 year old thread lmao.
i know, but just because a thread is three yrs old dont mean we cant still have a good time and express our thoughts and opinions on something, just sayin.;)

[n811]

HUH? I have dyno tests that we stopped at 70mph cause the powereband is not at top end speed. I dont think 80 is out of the question. Some gearing full pipe and porting. Might take a bit to get there but should be able to.