Track speed ?

meathooker · Mar 6, 2017

Curious what others are seeing.

Had some nice dry deep powder to do long steady pulls.

BD sidekick as delivered from BD.

48-50 mph at 8450-8550 rpm.

JJ_0909 · Mar 7, 2017

meathooker said:
Curious what others are seeing.

Had some nice dry deep powder to do long steady pulls.

BD sidekick as delivered from BD.

48-50 mph at 8450-8550 rpm.

What track?

meathooker · Mar 11, 2017

JJ_0909 said:
What track?

155 2.6

aj1180 · Mar 11, 2017

That sounds like it's in the ballpark for track speed. 8450 to 8550 seems a bit high for rpm. I'd add a couple grams to the primary and see if that helps. Might pick up a mph or two. You have to be right up against the rev limiter. Keep in mind that when you check your track speed again you will not be on the same conditions. This will effect track speed.

Ricks 32 · Mar 11, 2017

8550 is money on the Axys turbo. I'm running the race kit and mine spikes to 8600 and settles at 8550-8500.

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snowcheck163 · Mar 11, 2017

My Boosted 15 with a 163 I see about 70mph on a hard pull. Light snow. At about 8200rpm. 5-5 1/2 psi.

ripnit · Mar 12, 2017

14 motor in a 12 pro, BD / non intercooler/ updated tubes and box set at 6psi - seeing 62-67 mph depending on snow conditions

jim · Mar 12, 2017

I always enjoy track speed threads. You will typically see up to 30 mph difference from person to person. Ill just throw it out there...if anyone is getting 60 to 70 mph on a pump gas turbo on a 800 two stroke, they have officially defied the laws of physics and likely have cold fusion or something like that going on somewhere in their sled. I have been on 70 mph ttack speed turbo sleds...and they are called turbo apex or turbo nytro. And they destroy my 8psi pump gas m8 turbo...which has about 45 to 50mph track speed depending on conditions.

ripnit · Mar 12, 2017

OK......Here's what I do....Clear max speed on guage, climb hill read max speed.

jim · Mar 13, 2017

Track speed is not the max speed the sled's track experienced during a climb. My stock 600 would see 80MPH on the right type of climb. All tracks/sleds will zing up to high speeds during a climb.

Track speed is measured during the worse-case loaded-up situation while in a the climb...when you are moving along at 5mph or so. And it is sustained for 3-4 seconds or so.

AKFULLTHROTTLE · Mar 13, 2017

Ricks 32 said:
8550 is money on the Axys turbo. I'm running the race kit and mine spikes to 8600 and settles at 8550-8500.

Sent from my iPhone using Tapatalk

From some dyno reports, 8400 is about it...

aj1180 · Mar 13, 2017

I have a turboed nytro and I'll agree that the higher track speeds can only be achieved reliably with a 4 stroke turbo. An honest 60+ In powder conditions would be one unbelievably well set up 2 stroke turbo at 6-7 lbs. I'd really like to see and ride that sled as it would be a blast. I'm not biased here as I have a 2 stroke turboed Polaris as well at 10 lbs of boost and it's not even close to my nytro at 15lbs. As I said before it really depends on snow conditions.

fredw · Mar 13, 2017

Run a doo turbo impulse 800 Etec. Strait av gas on a three inch 174 and ten lbs boost low 70s to mid 70s mph and we'll pull this all day long.. At 550lbs

850s will be even better once tuning and clutching get dialled in, the difference between them is narrowing, also have a 300plus nitro:eyebrows:

jim said:
I always enjoy track speed threads. You will typically see up to 30 mph difference from person to person. Ill just throw it out there...if anyone is getting 60 to 70 mph on a pump gas turbo on a 800 two stroke, they have officially defied the laws of physics and likely have cold fusion or something like that going on somewhere in their sled. I have been on 70 mph ttack speed turbo sleds...and they are called turbo apex or turbo nytro. And they destroy my 8psi pump gas m8 turbo...which has about 45 to 50mph track speed depending on conditions.

meathooker · Mar 14, 2017

jim said:
I always enjoy track speed threads. You will typically see up to 30 mph difference from person to person. Ill just throw it out there...if anyone is getting 60 to 70 mph on a pump gas turbo on a 800 two stroke, they have officially defied the laws of physics and likely have cold fusion or something like that going on somewhere in their sled. I have been on 70 mph ttack speed turbo sleds...and they are called turbo apex or turbo nytro. And they destroy my 8psi pump gas m8 turbo...which has about 45 to 50mph track speed depending on conditions.

i was thinking the same thing.

my PG BD feels great right at 50 - cant imagine another kit is a solid 20-25% better.

southshore · Mar 14, 2017

17 axys with Silber 5lbs of boost 2 gals of av gas I see 51 mph in about 3 feet of pow climbing wfo

JJ_0909 · Mar 14, 2017

southshore said:
17 axys with Silber 5lbs of boost 2 gals of av gas I see 51 mph in about 3 feet of pow climbing wfo

elevation? track length and type?

I see about the same - maybe 55 - 2 feet of fresh, 7psi. 163 2.6"

southshore · Mar 15, 2017

JJ_0909 said:
elevation? track length and type?

I see about the same - maybe 55 - 2 feet of fresh, 7psi. 163 2.6"

About 8k feet 155 2.6
78g weights 8400 rpm

Bacon · Mar 19, 2017

fredw said:
Run a doo turbo impulse 800 Etec. Strait av gas on a three inch 174 and ten lbs boost low 70s to mid 70s mph and we'll pull this all day long.. At 550lbs

850s will be even better once tuning and clutching get dialled in, the difference between them is narrowing, also have a 300plus nitro:eyebrows:

I don't even have to ride or see that sled to know your full of crap. I've ridden with a Nypex that would pull those numbers and that thing was stupid fast.

AdrenalineAddict · Mar 21, 2017

I'm with you Jim, many think track speed and ground speed are synonymous. I was telling a fella a couple months ago my 155 Axy's will give me 38 MPH when set up right, he told me I should run a Cat, runs 50 MPH all day long. I took his Cat for a spin and got 37 MPH Hmmm!!

aj1180 · Mar 23, 2017

If track speed is always king then we all should be running 121x 1" tracks. I bet we could see 80 plus mph on a 6 lbs boosted sled if it was geared up. I've seen some short track 1.5" lug sleds do some amazing things in set up snow where track speed is truely king. In powder there are so many variables to consider. A well set up suspension that puts the power to the ground will out climb a higher track speed sled that is trenching.

Track speed ?

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