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SCRX-1mtn Videos

BlgsRX-1mtn

BlgsRX-1mtn

TY 4 Stroke God
Joined
Apr 16, 2003
Messages
1,530
Location
Billings, MT
Country
USA
Snowmobile
'03 RX-1 Mountain LE

Glad you guys like the videos. ;)! Silverbullet yes I do like the SC. As mmwildman stated on the Snowest forum, there may not be a track long or wide enough for these boosted 4-strokes. I am running a 15" wide, 162" long, 2" lug Camoplast Challenger. He was following me on the trail and everytime I blipped the throttle he said it shot huge roosted tails and dug deep holes :Rockon: .

The exhaust is the Whiteknuckle QC-1 with the h-pipe design eliminated and replaced with my x-pipe from the stock can.

Jim
 
Blgs -- My "tuners ear" alarm went off, RPM sounds low, especially in the cook vid, it sounds like it upshifts when you get airborne and doesn't recover (backshift) to retain peak rpm after you settled back in... Approach sounded about right in the cook vid and running out in the flats in the other vids... What RPMs are you seeing ???
 
HAMMER said:
Blgs -- My "tuners ear" alarm went off, RPM sounds low, especially in the cook vid, it sounds like it upshifts when you get airborne and doesn't recover (backshift) to retain peak rpm after you settled back in... Approach sounded about right in the cook vid and running out in the flats in the other vids... What RPMs are you seeing ???
Click to expand...

Hammer, I haven't really looked at the tach while climbing. On the lake run it was at 9600. I am clutched for a target of 9800 in the high boost setting. I'm running the 8FA-00 weights with 4.5 grams in the tips and middle everything else in the primary is stock. I have stock helix with a pink spring twisted at 70 degrees in the secondary.

Right now I'm running the low boost while still dialing in the carbs so I can pull the O2 sensor. Then, I'll switch the pullies to run high boost with race fuel and see what my clutching is needing.
 
Hammer, Are you running your SCRX in the over or under driven pullet setup? I think I may hit the 10,000 mark with my pullies switched maybe a little more.

Jim
 
My only suggestion, don't run over 9800 rpm for a prolonged period of time when overdriving the Supercharger (10 lbs) as oil temp can become an issue possibly.
 
Hammer, Are you running your SCRX in the over or under driven pullet setup? I think I may hit the 10,000 mark with my pulleys switched maybe a little more.
Click to expand...
If you're 9600rpm now and reverse the pulleys from 5lbs to 10lbs expect to exceed 10,000rpm with your current clutching... Dads running his SCRX at 1:1 (24/24) pulleys, 7 to 7.5lbs boost, 10,000rpm, pump gas, stock motor, 7500ft, 40F... After he installs the nose radiator for the SC fluid he is going to try 10,200 10,300rpm at 1:1 pulley ratio... That should put him right on 8lbs at 7500ft and not over temp the SC fluid... Like Allen said when you overdrive it you should keep it between 9800-10,000rpm and keep an eye on your SC fluid temps like the instructions state... The idiot light will go off at 165F... The "do not exceed for extended periods" temp is 176F...
 
I was just noticing that MPI's directions state not to run the blower over 10,000 for more than 5-10 seconds. But it also states that operation over 10,000 RPMs voids blower warranty. I guess once the carbs are dialed in, I'll switch the pullies and just watch my tach to make sure I stay down around the 10,000 mark. I think I'll twist the spring in the secondary another 10 desgrees and see what happens too. There is another video of a long steep climb that mmwildman didn't post. I'll see if he can upload that one also so I can listen to the revs.

I see I'm also still in need of more transfer in the two climbing videos. Especially the "BlgsRX 1 with boost" vid. My skis were in the snow and that is on a climb (notice the trees and other rider as the camera pans back down the hill). I doesn't help that I'm 255 without clothes on either ;)! and was still a tick fat on the jetting. My A/F on both of the climbs was still in the low 11s with 130s now I'm down to 127.5s and hitting low 12s at WFO.

Jim
 
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