SC Apex @ 5psi working awesome couple questions wanna go 7

[Bossman]

You should also get ahold of Allen Ulmer from Ulmer Racing to get the vented panel for under the motor for better airflow and cooling. It replaces the removable panel under the motor. The stock one is plastic and has no venting in it, but Ulmer has an aluminum one that is vented to allow for more under hood venting.

 

[Wakegod]

Are you running a stage 1 kit? I thought the most PSI the blower could produce was 10 maybe 11 if you are lucky.
If I could get 14lbs of boost out of this kit I might quit kicking myself for not getting a turbo.

 

[TurboJamie]

Thanks for the Ulmer tip I have done this for the hood in the pic below. Its just some really porus foam. It stops the snow from getting in but it keeps the cooler cool and looks sorta stock ish at first glance.

The SC has 2 pulley kits a 5-10# kit and a 7-14# kit.

 

[Srxspec]

The pulleys for 7 lbs are at a 1:1 ratio. How are you getting 14 lbs?

 

[Bossman]

Allen do you know is there a pulley to get 12 lbs.

 

[HAMMER]

EDIT: See new post below.

 

[TurboJamie]

The pulleys for 7 lbs are at a 1:1 ratio. How are you getting 14 lbs?

sorry im mental. I just assumed and now we see what that did hahah that if my pulleys now were 5-10 that the other would be 7-14. I thank Hammer for clearning that up for me This site is great for learning from. This being my first 4 stroke and first forced induction mod I have pretty much decided that I won't be riding a 2 stroke ANY time soon!

 

[HAMMER]

The Stage-I SC is a small compressor with a limited flow rate (312 CFM). Its rate of flow is similar to the smaller Schwitzer/Garrett/Mitsu turbos but far less than the GT25s and TD04s. The harder you work it, the more hot air you will be pumping into the engine, the intercooler will eventually heat soak, and efficiency drops like a rock. If your goal is, the maximum sustainable horsepower and performance possible from this unit, keep it in it's highest efficiency area and do not over speed the compressor. I've been running mine with the overdrive pulleys and do not feel the MPI recommended high compressor speed and low engine speed is going to work for me (personal preference only). Just doesn't feel right. I am going to set mine up so that I can run high engine speed and lower (more efficient) compressor speed next week with the 1:1 pulleys (24-24). I will be testing this theory with sea-level gearing for the Mountain Apex (22/40) at 6000-8000ft altitudes. If these combinations change my air fuel ratios I will adjust them using my fuel controller and my wideband O2 sensor for 12.0:1 across the board. I will also be testing different clutching combinations looking for one that will run in the following ranges under the different types of terrain I encounter mountain riding.

10,700 low-loads / 10,500 med-loads / 10,300 hi-loads.

1:1 Pulley Ratio Compressor Speeds

1500 x 12.67 = 19,005 (idle)
10,300 x 12.67 = 130,501
10,500 x 12.67 = 133,035
10,700 x 12.67 = 135,569

Should be 8lbs boost @ 6000-8000ft

MAX compressor RPM is 150,000 per ROTREX and MAX efficiency 71%

MPI recommends:

22 crank gear + 26 charger gear (5 lbs boost)(9800 engine)(104,564 compressor)
24 crank gear + 24 charger gear (7.5 lbs boost)(9800 engine)(124,460 compressor)
26 crank gear + 22 charger gear (10 lbs boost)(9800 engine)(147,111 compressor)

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http://www.rotrex.eu.com/files/Rotrex_Technical_Datasheet_C15_Range_V_2.0.pdf

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http://www.ty4stroke.com/viewtopic.php?t=24430

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http://www.ty4stroke.com/viewtopic.php?t=17061

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[Colorado Yamaha]

Keep us posted ~ I'm very interested in how this works. Derek