supercharger question
08-07-2009, 08:09 PM
#1
supercharger question
Ok so i was thinking today.. how could a supercharger work on a rc car. and how would you tune it? plus wouldnt you need an entire new exhaust systen to handle the supercharger just like on a real car?
08-07-2009, 08:23 PM
#2
08-07-2009, 08:49 PM
#3
There CAN be a slight power gain, only IF and WHEN you get it retuned.Nothing about RC engines was designed for a blower. But understand that superchargers where designed with four stroke engines in mind. By that I mean they have valves that precisely and completely close or open at a given time.This way it can force more air/fuel mixture into the cylinder. 2 strokes don't run like that as you know and so the "blower will force the mixture completely though the cylinder until the very last split second. more of it goes on thru to the exhaust. You have to run it real rich to compensate and as a result,waste a lot of fuel. Pretty much all the benefits of a tuned pipe are gone, since it is packing and pulling fuel by DESIGN. The supercharger throws all that out the window.Fully, 50% of the people who get one NEVER get it to run right, very few are EVER happy with it. Long and short of it is, a decent modder will give more benefits for less money to start and most modders will get you better mileage too! Support the engine modders on this site whether is AB,EB, or MassiveMods. (Or others I'm sure I missed) These guys know your engine much better than some bolt on piece of c*** and will make it much easier to live with.
08-07-2009, 10:29 PM
#4
I've tried one.. Heres my take:
With a 3 port .28 motor on 30% O'Donnell,
The motor immediately required richening with the belt driven blower and 50% overdrive pully. But it was not blowing fuel out of the exhaust. The idle was unbelievably strong and steady. I ran it on pavement in a 14lb XTM Mammoth on 40 series road rage tires. It pulled quick and hard through 2 gears and then leaned out on top. The tall gear on the Mammoth worked well with the blower because it seemed like torque was increased somewhat at low to upper mid rpms... not so well on dirt because there isn't enough traction.
I tried the same setup with 40 series bowties at revelation raceway and it lit up all 4 tires all the way down the straight. Only problems offroad were traction and throwing the belt off on big jumps. If the belt came off it immediately went rich. One other thing I noticed was the temps never seemed to vary no matter how hard I drove it.
If nothing else it was a kick to hear the blower whine and unbelievable amount of air it was sucking through the filter.
Video on pavement:
With a 3 port .28 motor on 30% O'Donnell,
The motor immediately required richening with the belt driven blower and 50% overdrive pully. But it was not blowing fuel out of the exhaust. The idle was unbelievably strong and steady. I ran it on pavement in a 14lb XTM Mammoth on 40 series road rage tires. It pulled quick and hard through 2 gears and then leaned out on top. The tall gear on the Mammoth worked well with the blower because it seemed like torque was increased somewhat at low to upper mid rpms... not so well on dirt because there isn't enough traction.
I tried the same setup with 40 series bowties at revelation raceway and it lit up all 4 tires all the way down the straight. Only problems offroad were traction and throwing the belt off on big jumps. If the belt came off it immediately went rich. One other thing I noticed was the temps never seemed to vary no matter how hard I drove it.
If nothing else it was a kick to hear the blower whine and unbelievable amount of air it was sucking through the filter.
Video on pavement:
| + YouTube Video | |
Last edited by avdub; 08-07-2009 at 10:50 PM.
08-08-2009, 07:37 AM
#5
LMAO, I think I can hear the blower whine, that is cool. Congrats on getting it running so well.I understand what your saying about throwing the belt. Over at lstforums.com they had a big discussion about that very subject. ONe guy was saying it broke 2 mounts due to landing off jumps. But he didnt say how big they were. Coulda been doing some mondo skate park jumps for all I know.
08-09-2009, 07:45 PM
#8
