max boost for nytro with stock motor

[fredw]

well said, your point makes sense, so running on pump fuel at around 13-14psi, a guy can suspect around the 240hp... is that correct

second question with a turbo and 160" track with the large fuel tank, what would be a fair weight for it full of fuel

thanks again

I think the numbers are starting to get a little optimistic here. A stock, naturally aspirated Nytro makes approx. 135 HP (depending on the dyno) at sea level which is under 14.7 psi of atmoshperic pressure. If a turbo kit was 100% efficient, which they aren't, then the motor should theoretically double its power at 14.7 pounds of boost. With the loss of efficieny taken into account, it typically takes approx. 16-17 lbs. of boost to double a motor's output. i.e. the MCX Apex kit @ 17 lbs. of boost makes approx. 310 HP. (150 HP x 2) would probably be close to 16 lbs.

According to their website, MCXpress has dynoed their Nytro kit @ 260 hp running 15 lbs of boost which is also consistent with the typical 16-17 lbs doubling the motors output (270-276 hp).

Not that it matters much it will still be kicking a$$ on all the 2-smokers.

 

[NM]

I think the numbers are starting to get a little optimistic here. A stock, naturally aspirated Nytro makes approx. 135 HP (depending on the dyno) at sea level which is under 14.7 psi of atmoshperic pressure. If a turbo kit was 100% efficient, which they aren't, then the motor should theoretically double its power at 14.7 pounds of boost. With the loss of efficieny taken into account, it typically takes approx. 16-17 lbs. of boost to double a motor's output. i.e. the MCX Apex kit @ 17 lbs. of boost makes approx. 310 HP. (150 HP x 2) would probably be close to 16 lbs.

According to their website, MCXpress has dynoed their Nytro kit @ 260 hp running 15 lbs of boost which is also consistent with the typical 16-17 lbs doubling the motors output (270-276 hp).

Not that it matters much it will still be kicking a$$ on all the 2-smokers.

I would agree with that, but lightening asked hp without headshim. No head shim makes huge diff in hp numbers. I am no expert, but I would think no head shim would be like adding 3-4 lbs of boost. Maybe someone in the know can chime in about this.

 

[NM]

well said, your point makes sense, so running on pump fuel at around 13-14psi, a guy can suspect around the 240hp... is that correct

second question with a turbo and 160" track with the large fuel tank, what would be a fair weight for it full of fuel

thanks again

It comes down to how much money you want to spend. I would say any where from 600-650 full of fuel. Both my Nytro and my Apex fall right in the middle of these numbers. They sure don't feel heavy though. When you coming to play in the trees Freddy? haha

 

[lightening800]

nytro

the nytro is a sweet chasis, i tried to ride a apex a while ago and felt like a clown on it, could not ride it, fred if you like your xp chasis the nytro is easier to ride than it ,believe it or not had the xp also.

 

[alrevedup]

I would agree with that, but lightening asked hp without headshim. No head shim makes huge diff in hp numbers. I am no expert, but I would think no head shim would be like adding 3-4 lbs of boost. Maybe someone in the know can chime in about this.

Our riding on any given day is between 10,000 and 12,000ft and sometimes up to 13,000ft. Turbo or otherwise, they all have to be de-rated for altitude. With or with out the shim.

 

[lightening800]

turbos

Our riding on any given day is between 10,000 and 12,000ft and sometimes up to 13,000ft. Turbo or otherwise, they all have to be de-rated for altitude. With or with out the shim.

altitude has a minimal effect on turbos, if your turbo makes 10psi at sea level, it will still make 10psi at lets say 6000ft, the turbo can compensate automatically for altitude where as other naturally aspirated sleds this is not the case less air less power.

 

[snowy1]

altitude has a minimal effect on turbos, if your turbo makes 10psi at sea level, it will still make 10psi at lets say 6000ft, the turbo can compensate automatically for altitude where as other naturally aspirated sleds this is not the case less air less power.

the turbo may still make 10 lbs of boost but you will still lose atmospheric pressure which in turn loses hp. from the stock hp. at 10lbs + 14.7 at sea level is a total of 24.7. at 10,000 ft. you have 10 lbs. + about 10 lbs atmospheric pressure = 20 lbs total, so if you are 150hp stock and add 100 hp. with boost at sea level = 250, at 10,000 ft. you lose 30% of the stock hp. which leaves 105 hp. + 100 with boost, so you only have 205 hp at 10,000 ft. with the same set up. a turbo will not automatically make up for it. you can turn the boost up to make up the lost hp.so ypu would have to run about 14 lbs to make the same hp.

 

[SNOW JW]

Snowy hit the nail on the head. That is why the bigger turbo up high works so much better and charge temps are cooler.