Apex dyno thread #2

[Rocket]

Hopefully this thread won't get offtracked like the other one did.

Anyways, more dyno time. I love the apex motor, except for the part of working our #*$&@ off to find a little horsepower. all you guys and gals that bought an Apex, Attack, or anything with the 150 fi won't be dissapointed. This motor hauls the mail. Torque curve that is flatlined. at 6500 clutch rpms, this thing have 95 ft lbs of torque, at 7000 it has 100, at at 7500 it has 100, at 8000 it has 97.5, at 8500 it has 94. 117 hp at 6500 clutch rpms. 144 horse at 7500, 153 at 8500.

I'm sure someone will ask why the stock came at 153 and every other dyon number out there is below 150. I don't know, I guess the motor we have is a good one. But I have numerous, like 15+ dyno runs to back up these numbers. I know the number is consistent which you want when dynoing. I ran stock runs, and backed them up at the end of the day with control runs. The numbers always came within a half horse. This motor is a 153 stock motor.

 

[Buster696]

Rocket,
First, thanks for the info and thanks for sharing...

Clarification question for you... On the screen/sheet I see RPM readings in 8000 to 8700rpm range on the screen pic (assuming this is clutch rpm). I know that there is a different % in gear reduction for the apex/attack (vs. rx motor) what is the motor rpm (comparing clutch rpm in these pics) at peak hp?

Thanks in advance...

--Buster696--

 

[Sidewinder]

Very impressive

 

[Rocket]

the number to use is 1.23
multiply the clutch rpms by 1.23 to get engine rpms
at 8500 clutch the motor spins at 10455.
the gear reduction is 30/37 or something like that or 37/30 whatever.
my dyno reads rpms off the output shaft so I'm getting what the clutch would be spinning.

on the full sheet pic, (the one that's white) the numbers got printed over twice, I was using pre-used paper cause I ran out. you can't really tell what the numbers say, but it starts at 6500 and ends at 8700

 

[Sidewinder]

Holy @%@#^%$ 10455 rpm, sick #*$&@ rpm man.
LOL
I cant wait
Never thought I would be on Japanese sleds in my life.
I have customers coming in asking to see my Rice Rocket they call it.
Even one guy yesterday asked my g/f so you gonna ride his rice rocket, she said NO!!! no ricearoni for me.
I then said thats ok my sled dont want any french fries on it either.
On a note she is French Canadian.
Scott

 

[NOS-PRO]

AWESOME!!!!!!!!!!!!!

 

[SledFreak]

Great Numbers, but I thought that most of the previous numbers that we saw were all on prototype mills I could be wrong...... Also, could it have been that those dyno runs were done in such warmer temps that it might have had an impact on the earlier numbers. Just a thought..... I'm glad to see such a higher number, that's great news for us.

 

[ROCKERDAN]

Ok so where do we run rpms on the tach?....wasnt it like 10,200?

thanks
Dan

 

[SledFreak]

Ok so where do we run rpms on the tach?....wasnt it like 10,200?

thanks
Dan

multiply the clutch rpms by 1.23 to get engine rpms
at 8500 clutch the motor spins at 10455.

Dan, clutch your buds GT between 10400 and 10500 would be the best starting position and go from there. But, Yamaha does say it's makes 150 at 10,500, so if you hit at 10,450 and move up or down +- 50 you will be in the ball game.

 

[SRXSRULE]

Where do you clutch? Pretty much anywhere between 9800 and 10800. lol Thats really what I love about these sleds, it dont really matter if your right on or not because the torque is so flat, it only changes a few numbers in a 1,000 rpm window. Now, for lake running, clutch it to the high end ~10,800~ for more speed. The r's you turn with a flat torque band that faster you go. ===SRXSRULE===

 

[Srxspec]

We recommends anywhere from 10,200 to 10,600 rpm for our clutch kits.

 

[Tork]

Great Numbers, but I thought that most of the previous numbers that we saw were all on prototype mills I could be wrong...... Also, could it have been that those dyno runs were done in such warmer temps that it might have had an impact on the earlier numbers. Just a thought..... I'm glad to see such a higher numbers

Rotax, yes a lot of the earlier ones were prototypes. But Allen Ulmer and now Rocket are basically saying that the production motors are stronger than the prototypes :shock: This is great news, many of us suspected that the production motors could be a little softer than the protos.

 

[SledFreak]

That's good to here,bring on the snow. I'm dying to try my GT out. We had 6" inches last week, but I could not get out. This week we are supposed to get more snow starting maybe tonight until Thursday. I will be out by then.

 

[MR.HAPPY]

Thats strong #'s!!!

I hope it shows in the real world!!!

ON THE SNOW!

BR

 

[welterracer]

Thanks for sharing the GREAT NUMBERS....

Im sure there is small variences in the sleds.. im sure not all will do 150hp..

Like RULE said these sleds are sooo easy to tune do to the fact they have such a wide window of power its great!