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Old 07-24-2004, 04:12 PM   #1
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Default Question on HPI Motors...

I am looking strictly for a good HPI Motor for a HPI RS4 2. I am kind of confused a few things.

Slide Carb is better than Rotary, better for tuning correct? Which of these motors puts out more speed and power?

This Nitro Star 12R SC...?

http://www.hpiracing.com/optionparts/stat-ns12rsc.htm

Or this Nitro Star 15SC...?

http://www.hpiracing.com/optionparts/stat-15sc.htm

Last edited by J Smith; 07-24-2004 at 04:30 PM.
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Old 07-24-2004, 04:19 PM   #2
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.

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Old 07-24-2004, 04:56 PM   #3
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One other question...

I don't like the black anodized Heat Sink that is with the .15sc Engine. Could I use this HPI Purple .15fe Heat Sink instead on it?

http://www2.towerhobbies.com/cgi-bin...?&I=LXNE41&P=7
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Old 07-24-2004, 06:52 PM   #4
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I think the main difference between the 2 engines is torque.

they 12sc can be bought on ebay for pretty cheap.
example : http://cgi.ebay.com/ws/eBayISAPI.dll...910980214&rd=1

the same auction as above is one every other week or so. If you dont get that one, but want the engine I would suggest waiting until the next auction comes around for that kind of motor.
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Old 07-24-2004, 07:32 PM   #5
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Thanks I won the auction! Wow that motor went cheap.
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Old 07-24-2004, 11:30 PM   #6
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Welcome to HPI Racing.......

The .12R SC has more horsepower and higher rpms than the Nitro Star 15 ,it's basically on a whole nother level than the Nitro Star 15.

Slide carburetors are much more sensitive than rotary carburetors so you have to be careful. I highly doubt if theirs a power increase from rotary to slide ,and if their was I doubt if anyone would notice it. I think the rotary and slide depends on whatever the car is easiest to setup to.

Your going to need this HPI Slide Carburetor Throttle Linkage RS4 ,if you plan on running the .12SC in your HPI RS4-2

Check in my signature below "RS4-2 Duet" I also own two HPI RS4-2 they are good cars and have much potential if done correctly.

Last edited by Schneller_101; 07-24-2004 at 11:46 PM.
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Old 07-25-2004, 10:38 AM   #7
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I would skit the HPI linkage and get an ofna linkage set. Much nicer IMO.

check tower for the ofna set
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Old 07-28-2004, 06:36 AM   #8
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Schneller_101
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Check in my signature below "RS4-2 Duet" I also own two HPI RS4-2 they are good cars and have much potential if done correctly.
i did a search already but did not come up with 2 much on how to solve my problem.

i have an rs4 2 with a dynamite .12 spd i think it was tuned by ron paris and i also have the 2 speed now as well.

here goes with the original motor before the 2 speed and now with the .12 in first gear only the car runs great and the dynamite motor is awesome great speed and accerleration for very cheap. the problem is as soon as it hits 2nd gear it goes to spin out.with the body on or off. i am running a honda prelude body and had a small wing for looks on it. a friend of mine at my lhs put an offroad wing on it and it handled a lot better but still spins out when in 2nd only but it goes straight about 20 ft longer. it doesn't matter if you let off the gas or are still on it.

any idea what i can do to make it run better it is getting close to 45-50 and is stock with 45wgt oil front rear, x pattern tires,rear shocks upper lowest mounting ,lower closest to the tire .
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