How much Power for 250 Pro Supercross?

How much power do these pros really have?
What sort of gains can you get from the best performing VP race fuels and an ECU?
What about ECU tuning, what does it do and what are riders wanting from it? We touch on that subject in this video a little.
We even compared a Vortex ECU to a GET ECU, to illustrate tune up matters!

[@craighills2382]

Great video once again, I do enjoy your ways of videos explaining an so .I find them easier for my understanding for the most part cpmpared to.

[@Runk3lsmcdougal]

Sweet video

[@zardportugal]

TOP videos here. Congrats.

[@franklange7280]

They have it figured out on snowmobiles. I like efi on my sled.

[@HPRaceDevelopment]

far easier application.

[@hellbentftw]

Might want to mention somewhere what size bike it is. Won't be obvious to many.

[@thedirtdigger5990]

I got a video on my channel of my fully modded 16 250sxf on the dyno making 50hp with pro6, best we got was 53hp once. I have since taken all of those mods and put them on my 21 250sxf. I've been asked many times if it was a 350 from the guys i race

[@HPRaceDevelopment]

bring it to our dyno and we will publish what it makes on our dyno

[@thedirtdigger5990]

@@HPRaceDevelopment where you located?

[@thedirtdigger5990]

Oooh Texas is a bit too far for me to travel

[@HPRaceDevelopment]

@@thedirtdigger5990 If it makes 50 on our dyno ill give you 2k

[@thedirtdigger5990]

@HP Race Development that's very tempting but Michigan to Texas is along ways away

[@maxdad05]

so is this a twisted motor? seems odd to have a stock can on a modded 4 stroke

[@HPRaceDevelopment]

it is a twisted build. How much he spent and what they agreed upon I didnt ask but he qualified for multiple super-cross night shows and was quite close to some mains on this bike. Sadly he got hurt and broke his tib fib midway into the season. He has a full fmf for it but the durability of ti exhausts systems is not great so he mostly rode it on a stock pipe. if you havent watched our channel we have showcased different exhausts on this generation bike. generally we see very little difference in performance on any exhaust. These days - its mostly weight savings

[@mopoworks7780]

are the hp numbers rear wheel or calculated crank power? what is the power loss %

[@HPRaceDevelopment]

rear wheel

[@Nils_Tore_Berntsen_Sagengen]

most bikes lose about 20% from crank to rear wheel😉

[@mattwindell1638]

I just went back and watched the 2023 250 sxf dyno run and saw it made about 42.5 on pro 6. Is it fair to say the new engine with pro 6 and stock ecu is 2hp better than a lightly modded 2022 with fuel and ecu?

[@HPRaceDevelopment]

we made 45+ on pro6 and ecu in that video 43.5 on pump gas and ecu 42 ish on stock ecu and pump. The new engine is better than most mod bikes from most places

[@googlesucks3520]

Whats your current turnaround time for 2013 300sx stage 2 package?

[@HPRaceDevelopment]

Cant get to it for a month

[@64maxpower]

Have you ever encountered where a rider is turning faster lap times on less power?

[@mikebishop6095]

Hey buddy I’m just ripping my own track stock ecu your thoughts on mr12 vs pro6

[@HPRaceDevelopment]

most powerful fuels you can buy

[@HPRaceDevelopment]

most powerful fuels you can buy

[@mikebishop6095]

@@HPRaceDevelopment thanks Derek and stock ecu is fine until I get an HP race development tuned GET lol

[@HPRaceDevelopment]

@@mikebishop6095 Dont know what you own but it shouldnt hurt anything

[@mikebishop6095]

@@HPRaceDevelopment Thanks again and I love your content and builds. I have a 21 yz250f power flow, high flow air cover and powercore 4 hex slip on and I run stock mapping because of your video on the map changes on the dyno with the power tuner app and stock was best it seemed

[@simoncleland704]

What does a stock 250 SXF on pump gas make your dyno?

[@HPRaceDevelopment]

published in previous videos, about 40

[@reh9999]

Interesting.

[@tiko-sn6kb]

Is that a stock pipe

[@ihateemael]

looked like you made your dyno run in 2nd gear . . why?

[@HPRaceDevelopment]

what gear should we run it in, and why do you think what you think?

[@ihateemael]

@@HPRaceDevelopment Hi, as far as i'm aware the industry standard, with a chassis dyno, is to use a gear which has the closest to a 1:1 ratio. Why. . this gives you repeatable results which are then comparable between bikes. Using a lower gear ratio gives torque multiplication which makes the actual number read irrelevant. At least that's what I was taught many years ago. But maybe you already know this? or have a fancy setup where you can program this in? . . which is why I asked. ps: I tried to find some quality resources to point to but nogo so far. cheers.

[@ihateemael]

ps: my research tells me hp numbers theoretically aren't affected . . but given that simply increasing rear tyre pressure "reads" as more hp, then you are a better position to test this than I am. cheers.

[@HPRaceDevelopment]

@@ihateemael gearing doesnt effect power in theory - Some gear ratios are less efficient in gear design that others - but dirtbikes are not cars and are never 1:1 anyways… The primary gear reduction is 3:1 or so most bikes before the transmission. then the trans ranges from 2:1 in first to sometimes overdrive in 5th or 1:1 then sprocket ration is 3:1 or so so its at minimum 6:1 even in 6th gear… For us, power is similar 2-5th gear mostly. we use our gear selection to get a load time we want to replicated track loads for mapping purposes

[@donaldblank8873]

Anybody that doesn't know a 2023 gas gas EC250 comes with 49.5 horse power stock will be questioned. These are specifications straight from the dealer. This guy's like you that gets false rumors running all over the internet.

[@HPRaceDevelopment]

You mean the guy trying to sell you something? Your dealer own a dyno and show it to you on the dyno? Nope.

[@denniswilder3014]

Dynos are different. Dynos are just tuning tool and can be altered to give huge numbers. The dyno is set and can show gains with mods. But the likely hood of a rider staying at the correct rpm is slim to none.

[@mahaniamir]

Seems GET ecu you have in house is better . With vortex it just got an extra HP !?????😢

[@HPRaceDevelopment]

If that

[@donaldblank8873]

The bikes need to be up to temperature before anything can be done. Other wise readings will be different every time. Please show the temperature of the bikes during these test. Is otherwise your data means nothing

[@HPRaceDevelopment]

Buy a dyno - publish your own wants and needs. We are a multi time national championship winning shop with top placing privateer pro bikes and winning clients in premier racing associations across the world. I test bikes to the same conditions we measure they experience in use. all of our published results are bikes fully up to temp, and we test them beyond “normal” operating temp for mapping purposes. If you can do better - start a business and get to it.

[@JimCooper-f8g]

Maybe at crank

[@jr6874]

around the same as a 250 2-stroke

[@Corteum]

His YZ 250 2-stroke teest delivered 49.64hp. and it wasn't even a pro bike, just had some porting

[@harryjohnson2]

1st

[@CryptoJace]

It's a 250

[@inevespace]

I expected something near 45hp. Results here are almost stock. Not related: drive chain looks not good. Many kinks.

[@HPRaceDevelopment]

xring - left a tad loose in axle setting. But good eye. I was concerned too but after a little playing with it by hand you could easily and freely move all the links both directions. If I had run it tighter it would have “aligned” the links prettier

[@inevespace]

@@HPRaceDevelopment I see, I suspected it is a chain with seals. I myself run such, because don't care about small power loss and like to adjust it only once in 50 hr. But never saw it on a pro race bike. But why power is relatively low? You have videos with 22 sxf250 where with vp pro 6 and get ecu you achieved 45hp. It can be an effect of atmosphere condition, but you mentioned that corrections take it into account and you can compare dyno results made on different days.

[@HPRaceDevelopment]

@@inevespace That's all this guys bike makes... For his budget and what his builder did that's the power level this 22 model is at. It's in line with what we have published on what stock 16-22 ktm's do plus pro 6 and mapping...

[@therawlifefamily]

@@inevespace your preference for chain adjustment is what I just found out and is a great benefit of a sealed chain. On my 450 I rarely have to adjust it whereas with a regular chain I had to adjust it very often.

[@inevespace]

@@therawlifefamily to be precise, it is not about adjustment itself, but rather lifetime of components. Because chain doesn’t “stretch” even in super muddy long rides, not only the chain, but sprockets live longer

[@SharonD369]

That yellow strap is going to bite your arse one of these days, can’t believe your using it to be honest.

[@HPRaceDevelopment]

As oppossed to what.

[@SharonD369]

@@HPRaceDevelopment It’s almost split in half, can’t you see that ?.

[@HPRaceDevelopment]

@@SharonD369 Its been that way a looooong time - maybe 5 years… I just got some new straps so you can be happy If the rear straps break the bike just more prone to slipping the tire its still secured up front 3 ways Ive tried turn buckle chains, they dont work we still have a cover to make for the drum - but Im more focussed on making power than crap i dont need.

[@SharonD369]

@@HPRaceDevelopment It doesn’t look good dude, your showing us your knowledge and professionalism you should make it look good so idiots like me can’t pick at it lol 👍