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I have C5C in my serpent 950, I just got x15 squeezed into a 200m traxxas. looks pretty mad. I got alot of useful information on how to tune the C5 but I search this forum and didnt get much on how to tune the X15. For example. The C5 likes to be rich LSN and lean HSN. and should load up after 5 secs at idle.... Can anyone help me on what the X15 likes? Or is all RB simular to tune?
Posts: 14 | From: Brisbane | Registered: Sep 2004
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posted
Some people say to tune the engine so it is rich in the LSN, i personally don't agree with that. Mabe it applies to off road but I mostly race onroad and tune my engines for a nice crisp low speed setting, it can idle for a looooong time, never overheats.
I have modified X15 and C4 and C5, they don't like a rich LSN..... if it is too rich, you have to lean the HSN to compensate which leads to erratic performance, overheating and hessitation after long bursts of full throttle.
Hope this helps
-------------------- Speed costs money, I just hope it's not a lot! Posts: 116 | From: Chapel Hill, NC | Registered: Jul 2002
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The big block 15 should act a lot like a 21 and should be tuned as a 21, with the rich LSN settings and all. The smallblocks tune totally differently. Alex, our settings can't be that far apart on our 21's. I agree that too lean on the HSN will cause cutting out at WOT. If your LSN is set WAY too rich, then yes you'll have to lean the HSN out too far to compensate. Too lean on the LSN and the HSN has to be richened to compensate. This is what I call "Crossed up". The engine aint gonna run right if you're crossed up! With my "Lean" HSN setting and rich LSN setting my engine runs all day at around 200 degrees, and I KNOW there's a lot more if I wanted to lean my HSN even more. So you see, our settings can't be that far apart! On road may warrant a leaner LSN setting and a richer HSN setting due to much longer periods of WOT.
Posts: 994 | From: santa rosa CA | Registered: Apr 2004
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If the engine is set incorrectly on the LSN it will not idle smoothly, it races up after a blast of full throttle. I set them so they return to a smooth idle right away, if not a severe push will develop on the onroad cars because the engine is still driving the car when you lift the throttle.
I'll take my buggy to the track one of these days and try your approach so we can compare oranges to oranges, and not onroad vs. offroad.
I do agree with you on the clutch thing....
-------------------- Speed costs money, I just hope it's not a lot! Posts: 116 | From: Chapel Hill, NC | Registered: Jul 2002
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I'm positive our differences in opinion stem from our different racing backgrounds. I'm sure that for on road the tune will be slightly different than an offroad tune.
Posts: 994 | From: santa rosa CA | Registered: Apr 2004
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