boost / hp ?
- Thread starter Xtremist
- Start date
What? I can't quite figure out the physics on that one LHFCare to elaborate?
Yeah what AB said. Here's some history for you Sledmamma - when LHF talks, best not to debate the point with him, he's never going to actually prove he even has a sled that runs anyway, I get the impression he's happy keyboard racing.
He's repeatedly made the same ridiculous claim (always makes comments to the turbo yammy crowd to try and get them rilled up) and been repeatedly challenged to show up at the BIS or Yamafest and back up his ridiculous claim, but always managed to never show up
. Acknowledgment is just feeding the troll. No one bothers with him anymore, just ignore him.
As for the original topic so we can get this thread back where it belongs.....
Is the sled intercooled? Any other motor mods done?
- Thread starter
- #3
yeah the sled has an intercooler, with a ported 2860 turbocharger, has carrillo rods, JE pistons etc.....aside from bore and stroke kit, basically a full motor mod. lots of money into the damn thing.....and yeah anytime good ol freak would like to meet on the damn hill, im game.
SLY
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Won't be ending for a while yet :d
MtnMaster
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a quick easy equation, (now there are many variables) but 1 lb boost equals a 7% HP gain. 14 lbs would be a 98% power increase, so roughly just under 300 ponies.
- Thread starter
- #6
- Thread starter
- #7
No.
Like anything else, the turbo tunes the power too. Smaller turbo's can't push the volume of air but spool up much quicker. Large turbo's spools lower and move lots of air.
Depends what you want your machine to do.
Like anything else, the turbo tunes the power too. Smaller turbo's can't push the volume of air but spool up much quicker. Large turbo's spools lower and move lots of air.
Depends what you want your machine to do.
- Thread starter
- #9
ok i guess i didnt quite explain properly.....i meant take the same turbo, and put it in one of the 4 places, rear, front, mid and side mount and do they all basically perform the same aside from maybe lag ? i do understand that the bigger the turbo the better the hp,
NM
Boost It - Fuel your Boost
At elevation your sled won't make any more power over say 18-19 lbs boost with your current setup unless for some reason you had very low compression, which it sounds like you do not. A 2860 turbo will fall on it's face at about 19-20 lbs boost depending on elevation and barometric pressure. Even if your turbo could keep up, the injectors are pretty much maxed at 20 lbs boost running stock fuel pressure. All turbo kits should make relatively the same amount of power at the same boost (to a point). A bigger turbo will move more air at equal boost pressure of a smaller turbo, so really a bigger turbo is just more efficient.
Just so you know...your motor is far from being built to it's potential with stock bore and stroke. I know of a few Apex motors that would make way more power at 14 lbs then yours would at 18-19. Just sayin.
Just so you know...your motor is far from being built to it's potential with stock bore and stroke. I know of a few Apex motors that would make way more power at 14 lbs then yours would at 18-19.
Just sayin.
hhhmmmm, i think a little less, 260ish
Xtrememest boost is boost as long as you are reading 20 lbs at your intake horns it doesnt matter where the turbo is located. Of course front mounts you will have the least lag if you used the same turbo on rear mount as front mount as well if you have a rear mount you probably have to be putting out 22 lbs of boost at the turbo due to pressure loss due to flow restrictions where as on a front what the turbo is putting out is what is going into the motor. Aside from this this fuel your fuel system is key and that is why you can hop on one sled boosted to say 20 lbs and hop on one that is boosted to 14 and the 14 seemes more powerful it is all about the fuel setup as their is allot of tuning to get the sled to dump the correct amount of fuel at the set load / boost / throttle position and this is why standalone systems are being developed cause factory systems with a piggyback just arnt complex enough for 4000 feet of elevation change etc. But at sea level if you were boosting 20lbs your engine would be seeing a absolute pressure of 34.7 lbs which would be good for 300 hp.
- Thread starter
- #13
oh yeah i know that you can bore and stroke on top of turbos, but to me that is getting alittle excessive, ive ridden a friends apex that is bored to a 1200 and stroked (not sure what the new stoke is) but honestly you cannot control the power you have, i guess the benefit if you can call it that is that you can run lower boost.....but it is damn expernsive to bore and stroke em... but thanks for the info guys and yeah that rapid bike seems like a pretty awesome system for fuel management, i think im going to try that out, i do not like pure logic, like u say, to simple.
NM
Boost It - Fuel your Boost
I guess i wasn't very clear. Making the motor bigger cc is NOT better IMO. My point was that you can do many things aside from rods and pistons that will make way more power. Pure logic is good and simple. Sometimes simple is good.
At elevation your sled won't make any more power over say 18-19 lbs boost with your current setup unless for some reason you had very low compression, which it sounds like you do not. A 2860 turbo will fall on it's face at about 19-20 lbs boost depending on elevation and barometric pressure. Even if your turbo could keep up, the injectors are pretty much maxed at 20 lbs boost running stock fuel pressure. All turbo kits should make relatively the same amount of power at the same boost (to a point). A bigger turbo will move more air at equal boost pressure of a smaller turbo, so really a bigger turbo is just more efficient.
Just so you know...your motor is far from being built to it's potential with stock bore and stroke. I know of a few Apex motors that would make way more power at 14 lbs then yours would at 18-19.
More efficient I think isn't wording it correctly. IMO, efficiency for my style of riding is creating the proper boost but spooling the quickest. I'm not huge on hill climbing, but certain hill climbers keep it pinned, so boost lag isn't too much of an issue.
If I had the choice to size or do a turbo kit, I would run lower boost (I don't need huge power, but 130HP on a heavy sled isn't acceptable), but would run it around 200 HP with the smallest turbo possible.
All depends how your ride. THe Apex is a monster. You really have to man handle those things so if you are just doing climbing, then yea, turbo size can vary.
It's all fun. Do research, read, make some informed decisions. Keep in mind not all info on the net is accurate =)
Let us know how the sled runs.
j_w10
Active member
this is a topic that also intriges me. im running a impulse turbo trying too set it up for 16 psi. i found a simple equaition to figure out your approximate hp with boost.
(stock hp/14.7) x (14.7 + boost) = hp
so for me on a nytro (138/14.7) x (14.7 + 16) = 288.2 hp
Dont know if the math is right but according to the figures they give on other sites the math is always close to the estimated hp. keep in mind that i am running a stock engine with the recommended timming changes and head shim from paul with his stand alone kit. what do you guys think is this close or is this way off base.
(stock hp/14.7) x (14.7 + boost) = hp
so for me on a nytro (138/14.7) x (14.7 + 16) = 288.2 hp
Dont know if the math is right but according to the figures they give on other sites the math is always close to the estimated hp. keep in mind that i am running a stock engine with the recommended timming changes and head shim from paul with his stand alone kit. what do you guys think is this close or is this way off base.
- Thread starter
- #17
i agree tyhat sometimes simple is the way to go, but im not so sure that its the way to go here, ive got quite a bit of info on this rapid bike setup, and if it runs like its supposed to it sounds like the cats ass. but it is very in depth, all sorts of settings, you can fine tune the hell out of it, store 3 different maps etc.
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