how much horse power

[2006 400ex slsd]

how much horse do u guys think my 06 400ex has it has a DG slip on k@n filter and stage 2 cdibox i think stock is 35-39

[bkelley]

No, stock is like 27 HP. You're probably at 30 - 31 HP.

[TRXRacer1]

Originally posted by bkelley
No, stock is like 27 HP. You're probably at 30 - 31 HP. I think that's a best case scenario too! I'd say 29.

[2006 400ex slsd]

ohhh ok coool thanks for the info

[honda400ex2003]

Originally posted by TRXRacer1
I think that's a best case scenario too! I'd say 29.

x2 steve

[bkelley]

Well I was figuring a properly piped and jetted bike with a filter would fetch 4 more HP.

[flyjum]

Right around 30whp

Get a cam and intake then you would be around stock 450r hp of 34-35.

[TRXRacer1]

Originally posted by flyjum
Right around 30whp

Get a cam and intake then you would be around stock 450r hp of 34-35. Nope

[honda400ex2003]

Originally posted by flyjum
Right around 30whp

Get a cam and intake then you would be around stock 450r hp of 34-35.

Now that is a statement you dont see everyday. hahahahahahahahaha lololololololol. steve

[beags86]

Originally posted by flyjum
Right around 30whp

Get a cam and intake then you would be around stock 450r hp of 34-35.


yeah a cam and intake, i think i am going to go with a victor jr. and comp solid roller with .600 lift and then i am going to up grade with some hooker headers and 4.11s out back

lol made myself laugh on that one.

[flyjum]

For intake Im talking lid/filter.

On a Yfz you can see 5hp gains with a fuel customs intake.

Also with the cdi a hotcam will help him ALOT in top end power as he can rev higher. Also the cdi will give him more timing then stock one.

Also victor jr intake manifold will suck on street use.
It would be all right for high rpm. Dual planes are better for street.
LOL

[Muzzgit]

To get to 35HP you will need, as I have, Hi-comp piston 406cc, stage 2 Hot Cam, Ported head, Rocket slip on, lid off + K&N......35.4 on the dyno.

Still, if I had my time again, I'd just go with a 450R with a slip on and leave it at that.

[honda400ex2003]

Originally posted by flyjum
For intake Im talking lid/filter.

On a Yfz you can see 5hp gains with a fuel customs intake.

Also with the cdi a hotcam will help him ALOT in top end power as he can rev higher. Also the cdi will give him more timing then stock one.

Also victor jr intake manifold will suck on street use.
It would be all right for high rpm. Dual planes are better for street.
LOL

the difference is that is a yfz and this is a 400ex. lol. you will be hard pressed to find 5hp anywhere on a 400 without spending some $$. steve

[ballerchaos]

i dun know, the jardine full exhuast has dyno charts that show about a 4 hp gain with a propperly jetted bike, no air box lid, with a uni, and of course the rs-5 exhuast on a 400 ex, to the ground, so that puts u at just about 31 hp, so why wouldnt any other exhuast come close??

[ballerchaos]

sorry, just checked the dyno sheet, the 400ex they ran stock was at a 25.1 hp with there exhuast, jetted, no lid, it makes 30.3, 5 hp to the ground is respectful, and a noticeable increase, and for 325 shippped for a full exhuast you cant beat it

[TRXRacer1]

Originally posted by ballerchaos
sorry, just checked the dyno sheet, the 400ex they ran stock was at a 25.1 hp with there exhuast, jetted, no lid, it makes 30.3, 5 hp to the ground is respectful, and a noticeable increase, and for 325 shippped for a full exhuast you cant beat it I have a bridge for sale if you're that gullible.

[ballerchaos]

Originally posted by TRXRacer1
I have a bridge for sale if you're that gullible.
I dun know dude, its possible to put that much to the ground without a lid and a full exhaust, with propper tuning, hell i pulled the air box cover off of my dads mower, drilled out the jets just a tad, and removed the muffler and the thing does burn outs in wet grass lol, so....

[killer400ex]

a lawn mower? since when did this become a john deer forum? in that case my lawn mower will do wheelies and pull big heavy things so beat that. listen up your comparing apples to oranges here bud. a tractor operates alot different than a quad does, and for your info doing all that stuff to a lawn-mower wont make a difference because they are governed, the only way you would notice a difference in power is if you screwed with the governor, the only difference that would make is how it sounds

[bkelley]

Originally posted by killer400ex
a lawn mower? since when did this become a john deer forum? in that case my lawn mower will do wheelies and pull big heavy things so beat that. listen up your comparing apples to oranges here bud. a tractor operates alot different than a quad does, and for your info doing all that stuff to a lawn-mower wont make a difference because they are governed, the only way you would notice a difference in power is if you screwed with the governor, the only difference that would make is how it sounds Not sure if serious...

[killer400ex]

dead serious lol

[honda400ex2003]

heres what you need to do. go to ct racing . com and check out the exhaust shoot out there from a few years ago. look at the max hp output of every exhaust on the list. you should read the whol deal, they use a k&n filter and jet each one with a dj kit and get it tuned on the dyno. there is NO exhaust combo that will produce 5 hp by itself. granted this is a slip on only and the biggest peak gain from a stock internals engine was 1 hp on the CT racing and the white brothers. when companies are doing this testing on a machine, they are not listing the other things done to the machine when they are dynoing them. just because it says it is just the exhaust doesnt mean it does. I know this for a fact from talking to manufactures! they do anything and everything to get as much hp out of an exhaust as they can. I have seen exhausts brag up 12 hp. not on its own. it is on a full blown race motor compared to a stock engine. they dont list what is done to it though. just a open air box this and something else that, it isnt always true as trx has said also. believe what you want! I had my 400 dynoed 4 weeks ago, 34 hp with quite a bit done to it in the way of engine work for a 10:1 compression engine. I know that a header will not yield another 3 hp out of it. I would be at 37 with that, sorry not gonna happen. just because it says something doesnt mean it is true especially if it is on the internet! im done arguing about this, you can believe what you want, for the rest of us realists as bkelley, trxracer1, and I are, we know what these engines are actually running. steve