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Old 10-17-2009, 02:47 PM   #1
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Default Tunning help please

The car: losi 2.0 8ight buggy, stock motor with turbo head(3 shims), re11 pipe, byron gen 2 30% everything else stock. P3 turbo plug

The problem: at idle it runs great, but when doing a high speed pass it seems to fall off like its runing out of fuel. I had it tuned great when the weather was around 70 degrees but with engine temps at 230 to 250, today i was running i t to get ready for some practice at the track tomarrow and no matter what I did i couldnt get it to run over 200, out side temps today are 50 degrees, leaning it out seemed to bring the temps up but made it fall off at high speed, riching it up seemed to make it run better but also brought the temos down. should I use a P6 plug or? Thanks for any advice......
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Old 10-17-2009, 03:28 PM   #2
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High needles too lean
Low needles too rich.

out of balence settings probally. the low end is keeping temps in check but as soon as you get up to speed she lean bogs right?

reset idle screw after adjusting.
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Old 10-17-2009, 03:51 PM   #3
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High speed too lean and the plug is fine richen top two hours & lean the low two hours this should bring your temps up and also your idle, just readjust idle after you run a couple of laps or your up too running temp.
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Old 10-17-2009, 04:21 PM   #4
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thanks guys, that sounds liekit will work, I'll give it a shot in the morning.....it's deff a lean bog at high speed, I'll start with riching up the high side 2 hours and leaning the low side 2 hours and go from there.....what would happen if i switched to a p6 plug btw.
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Old 10-17-2009, 04:30 PM   #5
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I have never gone colder than p4 with OS plugs.

A hott OS P3 plug is really easy to tune and good for short tracks, but it can advance your ignition too much and steal some of your top end. P5 may give you better top end.
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Old 10-17-2009, 04:38 PM   #6
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Originally Posted by Zerodefect View Post
I have never gone colder than p4 with OS plugs.

A hott OS P3 plug is really easy to tune and good for short tracks, but it can advance your ignition too much and steal some of your top end. P5 may give you better top end.

Ive got a p3 in it now and a p6 to try, i was thinking with the cold a p6 might work better im not sure, i prob should stay with the p3 ya? oops i just read how to tell what the temps are for plugs and saw that the p3 is ultra hot and the p6 is cold....So i guuess ill stay with the p3......
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Last edited by mudboger07; 10-17-2009 at 04:53 PM.
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Old 10-17-2009, 05:23 PM   #7
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I would stick to the p3 it runs hotter P6 is a medium plug it's getting cooler out and the air is more dense.You will find that these engines love this weather!! That's probally why your running lean on top more Oxygen.
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Old 10-18-2009, 07:01 PM   #8
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Quote:
Originally Posted by Zerodefect View Post
High needles too lean
Low needles too rich.

out of balence settings probally. the low end is keeping temps in check but as soon as you get up to speed she lean bogs right?

reset idle screw after adjusting.
Well that was it zero, I made the changes to the high and low needles and wow what a difference......this thing screams now.......
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Old 10-18-2009, 07:44 PM   #9
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Quote:
Originally Posted by mudboger07 View Post
The car: losi 2.0 8ight buggy, stock motor with turbo head(3 shims), re11 pipe, byron gen 2 30% everything else stock. P3 turbo plug

The problem: at idle it runs great, but when doing a high speed pass it seems to fall off like its runing out of fuel. I had it tuned great when the weather was around 70 degrees but with engine temps at 230 to 250, today i was running i t to get ready for some practice at the track tomarrow and no matter what I did i couldnt get it to run over 200, out side temps today are 50 degrees, leaning it out seemed to bring the temps up but made it fall off at high speed, riching it up seemed to make it run better but also brought the temos down. should I use a P6 plug or? Thanks for any advice......
Out of curiosity, what elevation are you running? I'm having to run 6 shims (.6mm total), are you running 2 .2mm and 1 .1mm or 3 .2mm?
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Old 10-19-2009, 01:18 PM   #10
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Originally Posted by madweazl View Post
Out of curiosity, what elevation are you running? I'm having to run 6 shims (.6mm total), are you running 2 .2mm and 1 .1mm or 3 .2mm?
That thing definately looked good yesterday. It was pulling with my OS Speed. I liked it so much I went and bought one today.

We are about 300 ft ASL. Tennessee
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Old 10-19-2009, 02:04 PM   #11
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Ken, What brand turbo head will work?
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Old 10-19-2009, 03:14 PM   #12
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Ken, What brand turbo head will work?
Here is the link, I bought it from losi....i think the price was around $20
and came with 3 shims and a t3 turbo plug..the head and the re11 really woke this thing up.......

http://www.horizonhobby.com/Products...prodDetailTabs
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Old 10-19-2009, 05:14 PM   #13
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Quote:
Originally Posted by madweazl View Post
Out of curiosity, what elevation are you running? I'm having to run 6 shims (.6mm total), are you running 2 .2mm and 1 .1mm or 3 .2mm?

hey mad, I'm running the 3 that came with the turbo head and an extra one i'd bought that was 1mm, I'm not sure the thickness but the next time i pul the head I'll measure it.
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Old 10-19-2009, 05:19 PM   #14
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Originally Posted by hyperc10 View Post
I would stick to the p3 it runs hotter P6 is a medium plug it's getting cooler out and the air is more dense.You will find that these engines love this weather!! That's probally why your running lean on top more Oxygen.

Thanks hyper, i put the p3 back in and it tuned very well....
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Old 11-01-2009, 05:48 PM   #15
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I had the same prob.
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