Higher boost on a Pro

[twsandrew]

Anyone running over 12lbs yet every day and if so what kit? Want to switch but coming off higher power sleds and being a bigger rider 6-10lbs just will not do it. Ready to pull the trigger but I have only seen one sled run much boost and that was OVS. Anyone with BD or Silber kits running higher boost on race fuel yet?

 

[Kestrel2126]

I have run more than 12 PSI on my pro from time to time, but I can assure you it is not worth it, and actually takes away from the rideability that makes the Pro what it is. The only time you will want to run more than 11-12 PSi, is a wide open face or chute, and you had better have some good suspension underneath you, or even then, it will not be useful.
As you mentioned, you are coming off of higher HP sleds, which is fine, but I am guessing that they were also considerably heavier sleds, that do not handle as well as a Pro. If you were talking about Yamahas, then you cannot even begin to compare boost #'s, and are going to be starting over, as far as what you want/need for turbo power. If it was Cat, then you will also be dealing with a much lighter, nimbler sled. Yes, you will notice that the Cat feels more powerful with the same PSI, but you will also be able to put the power to better use on the Pro, and get further/higher/tighter. (Think Harley Vs. Crotch Rocket).
For what it is worth, I'm 205Lbs w/o clothes, so probably 240 at least all geared up, and I ride at 10PSI most of the time (when the snow is good), and rarely go above 12 anymore.

 

[edavis0202]

Burrant runs his sled at 14lbs, not that that means anything to you and me, because Im sure there is more going on behind the camera that we dont know.

 

[2XM3]

agreed, 10-11 is about perfect on the pro in 99% of all riding...im 6'6" and 285... my apex...pppfffftttt....never again, just like racecars, weight is everything you NEVER want more power than you and the chassis can control...smooth in control will always walk allover crazy power everyday of the week. Plus the fact that in any boosted sled the clutch has to work with the chosen power and it s super fine line from low end snappy to slug on the bottom as the big boost grows ( thats why there are maybe 25 primary springs, 15 secondary and 10+ helixes for the pro on my shelf...lmao)


edit at 7500-9500 feet 10 psi

 

[m1kflyingtiger]

Sorry, but these boost numbers mean nothing without an elevation reference. I can run 10 psi at sea level on av, but that's too close to the limits of the fuel for me so I normally run 8. I have gotten 12 psi at about 1000' before and it's an absolute beast! (Should have used more octane though...)

Burandt running 14 psi at 10,000' isn't a suprise to me at all as that's roughly the same as 9 psi at sea level. Absolute pressure at sea level is 14.696 and at 10,000' is 10.108, meaning he has to run ~4.5 psi just to bring the sled to stock sea level power.

If your asking if the sled can handle 15ish psi of boost at elevation, then with the right fuel there is no doubt in my mind. If your looking for 20 + psi out of it is say your probably pushing the limits. I heard of a sled running 18 in revy. Think it was a twisted but not sure. I wasn't there. The reason your hearing so much of sleds in the 6-10 psi range is 1. Because Silber gave an amazing deal to snowesters the last two years and his turbo maxes out at 15 psi. And 2. Because, like stated above, the sled just handles SO much better. I came off of a piped m1000 that slp had dyno'd at 195hp AT SEA LEVEL (I think that's a wishful sales pitch, but it never stopped pulling) and rode the pro stock the first year. I got in and out of more places on that stock 140 hp sled than I ever did on the m1000.

 

[Kestrel2126]

Sorry, but these boost numbers mean nothing without an elevation reference. I can run 10 psi at sea level on av, but that's too close to the limits of the fuel for me so I normally run 8. I have gotten 12 psi at about 1000' before and it's an absolute beast! (Should have used more octane though...)

Burandt running 14 psi at 10,000' isn't a suprise to me at all as that's roughly the same as 9 psi at sea level. Absolute pressure at sea level is 14.696 and at 10,000' is 10.108, meaning he has to run ~4.5 psi just to bring the sled to stock sea level power.

If your asking if the sled can handle 15ish psi of boost at elevation, then with the right fuel there is no doubt in my mind. If your looking for 20 + psi out of it is say your probably pushing the limits. I heard of a sled running 18 in revy. Think it was a twisted but not sure. I wasn't there. The reason your hearing so much of sleds in the 6-10 psi range is 1. Because Silber gave an amazing deal to snowesters the last two years and his turbo maxes out at 15 psi. And 2. Because, like stated above, the sled just handles SO much better. I came off of a piped m1000 that slp had dyno'd at 195hp AT SEA LEVEL (I think that's a wishful sales pitch, but it never stopped pulling) and rode the pro stock the first year. I got in and out of more places on that stock 140 hp sled than I ever did on the m1000.

This is absolutely true, and I guess I just assume everyone on here rides at the same elevation as myself, sorry. I'm at 10K', and 10-12PSI is the sweet spot for 99% of the conditions. I have had one of theses up to 18PSI, and can assure you that, while it is intense, it is also useless unless you are going straight up. 18 PSI is about the limit of where the motor will stay together, as I have some RMSHA buddies that ride for BD that have tested the limit.

 

[KAWGRN]

Yep at 10k elev a pro 800 at 8-10 psi,,non intercooled pulls the same clutching as a pro normally asperated at sealevel ,,,so how much power are you REALLY making,inquiring minds want to know?not sure what happens at 12-psi and up but HP starts to really ratchet up!that being said at 10K I like 12psi

 

[Kestrel2126]

Yep at 10k elev a pro 800 at 8-10 psi,,non intercooled pulls the same clutching as a pro normally asperated at sealevel ,,,so how much power are you REALLY making,inquiring minds want to know?not sure what happens at 12-psi and up but HP starts to really ratchet up!that being said at 10K I like 12psi

This is partially true, but you also have to take into account that the snow conditions and terrain at sea level are much different than at 10K', so saying that 10PSI at 10K' is the same HP as stock at sea level isn't quite true. As MK1Flying tiger said, HP is actually equal at 4.5PSI of boost at 10K', and sea level stock. The snow alone up here sucks so much power, vs the ice of say, New England (Sea Level almost anywhere). For instance, if you only rode groomed trails at 10K', you would run much heavier clutching at 10PSI, than you would stock at sea level.

 

[philsummers21]

I came off of a very well built Tapex running 18#. That sled pulled harder then anything i have ever rode. Im running my pro at 10# around 9000 ft. Will probably turn it up to 12 when i get used to the chasis a little more but im more then happy. Will the Pro climb with the apex, absolutely not. Will the Apex boondock like the pro, absolutely not.

 

[Boston Racing]

Yep at 10k elev a pro 800 at 8-10 psi,,non intercooled pulls the same clutching as a pro normally asperated at sealevel ,,,so how much power are you REALLY making,inquiring minds want to know?not sure what happens at 12-psi and up but HP starts to really ratchet up!that being said at 10K I like 12psi

You mean to tell me that a N/A pro is running 74 gram weights at sea level

 

[m1kflyingtiger]

You mean to tell me that a N/A pro is running 74 gram weights at sea level

Definatly not , but I was pulling 68's before I put the turbo on. They over rev'd at true sea level, skipping up creeks running into the inlet to get to the base of a hill, but once 500-1000' up it would hold 8250-8300 with 68's in. Our sea level has an altitude density of a few hundred feet below sea level though. So might be slightly more power than "sea-level" hp numbers.

 

[Duramax325]

So if you wanted to 10 to 12 lbs at 10000ft what weight would u want to start with in primary

 

[XP860]

79.5 grams should be spot on. I tested this last year. Should pull 8200-8300 with the PINK spring!

 

[Boston Racing]

We have ours set up at 74 and we ride 10-12k at 10 pounds with the pink spring or orange. You also have to remember you we're not pulling a 48 degree helix with 68 gram weights.

 

[m1kflyingtiger]

. You also have to remember you we're not pulling a 48 degree helix with 68 gram weights.

Very true

 

[twsandrew]

Thanks for the good comments. I am not trying to compare the Pro to the Yami. I have been there and they just make me way too tired at the end of the day. I do feel the cat M chassis is as flickable to me as it needs to be. I have only spent a little time on a pro though.
Quick question?
How will a Pro at 12lbs on race fuel compare to an M8 at 12lbs on race fuel?

 

[youd47]

Thanks for the good comments. I am not trying to compare the Pro to the Yami. I have been there and they just make me way too tired at the end of the day. I do feel the cat M chassis is as flickable to me as it needs to be. I have only spent a little time on a pro though.
Quick question?
How will a Pro at 12lbs on race fuel compare to an M8 at 12lbs on race fuel?

I think the M8 definitely has the power edge. Pro definitely has the fun factor edge. I'm excited see the OVS tuning improvements this year and hope I'm wrong on the power edge.

 

[gmustangt]

Run an appropriate sized turbo, with some porting and a water to air... And 10-12# should make you pretty happy

 

[allblowdup]

bd race gas kit@2000 ft 10-12 psi good all day. 14 psi ok for a bit. 16 psi lifts the heads and burns the o-ring. 14 psi for longer periods will do the same. The fix is a billet head with arp bolts. Not sure how much boost a guy can run then. Havent had any probs since.

A dragon bd race gas turbo at the same elevation will lift the head and burn the orings in 6 seconds at 18 lbs of boost. Whoops!!!