Finished the break in now what...

[redhatman]

I had already bought my gallon of top fuel before you said that. It was to late. I noticed that Traxxas Top Fuel smells a lot different than blue thunder.... just an observation.

 

[nitroman26]

just I've used traxxas fuel 33% since they came out with it. I was using another maker but changed for the higher % I went from 20% to 33% and had to lean out the engine to get it to my running temp of 230-240. I've used it in 3 xtm24.7's, 2 mach.26, 1 2.5r, a hot bodies .26 and most reciently a wasp .28 all with very good luck and no probs tuning. BTW the wasp is stupid fast in my lightning gt with th BIG tires and a 3 tooth cluch bell increase it will still want to lift the front end off the ground. anyway just wanted to give input I agree you shouldnt be changing fuel around, find what works ang stick with it. BOOYA:fro:

 

[sweetdiesel]

But you should break your motor in with the same fuel you plan to run.

I thought this was outdated information? I broke my Collari in with 20% trinity, then switched to odonnell's 20% and now I'm using trinity 30%. I read here that as long as you give it a tank or two of tuning with the new fuels it was safe to change fuel brands or percentages. Please clarify on the reason why it is imperative to run the same fuel as break-in. :shrug:

 

[Bouzouki]

Switching fuels may make you have to retune the engine, thats about it.

It wont do any harm as long as its tunned well.

 

[redhatman]

ok, ... as far as tuning goes, what I have been doing is when I dont see enough exhasut I richen the LSN, and vise versa. When I have the right amount of exhaust, and I am running to hot or cool, I richen/lean the HSN. Is this the correct way to tune? If not, what do you guys do? Thanks
-Pat (redhatman)

 

[aj200415]

ok, ... as far as tuning goes, what I have been doing is when I dont see enough exhasut I richen the LSN, and vise versa. When I have the right amount of exhaust, and I am running to hot or cool, I richen/lean the HSN. Is this the correct way to tune? If not, what do you guys do? Thanks
-Pat (redhatman)

thats how i tune.

 

[rocknbil]

But you should break your motor in with the same fuel you plan to run.

This is correct. There is a process called hysteresis that occurs when you break in an engine, and it changes with the percentage of nitro you use. It has to do with conditioning the metals to the expansion characteristics of various nitro contents. Read this for more info, near the bottom of the page.

You should always run a short break-in procedure of at least a few tanks when changing nitro percentage, up or down.

 

[Bouzouki]

Just a tip, set the LSN to factory settings and leave it.

Your just making things complicated for yourself.

The engine can be tunned while leaving the lsn at stock settings.

Hsn is gonna controll the temp overall, richen/lean that depending on your temp.

Aim for 220-260F.

If your idling to hot, then I could understand why you would want to richen the LSN.

 

[Diver6127]

The only time you should really need to tune your low end is for holeshot performance. If it gurgles then takes off (or flames out) lean it out 1/8. If it cuts off and temp is high (over 260) it's too lean. Check your LSN settings by pinching the fuel line 1-2 inches from the fuel nipple. Count the secs and if it's 3-5 seconds before shutting off, you're in the ball park. If it dies instantly you're lean. If it take more than 5 sec's, you're rich.

 

[Plaidfish]

First off rocknbil, 10 points for th euse of a big brain word...hysteresis, haven't heard that since college...I had to prove either hysteresis, point of memory return or Moment of inertia as the force being applied to the veranzanno Bridge if a FLY lands on it and takes off again.....

second if you never learn to tune your bottom end you will never win a race.....that's more critical when you are coming out of corners and going to pass someone.....I have to tune my buggy at mills pond almost solely from the bottom end.....not only do I look for smoke at WOT but I also go by this:
Short technical track where temp is high but not lean bogging, I richen LSN.....
Short track temp is cold and not bogging from fuel, I lean HSN
reverse for long track....and I want it to be real snappy off the line...I always ere to the richer side of tuning......this weekend I found out exactly how much more I can get out of my engine from tuning it better.....I was happy w/ it but my friend fine tuned it a little for me and HOLY CRAP....my RG was pretty F'ing snappy....now I was running good and temps were low (220*) but leaning out the bottom a hair raised me to 230 and I had A lot more response from it......you also need to tune for driving styles as well.....If you like just WOT passes then you need to be richer than someone who likes short technical tracks that you're on/off throttle the whole time......

 

[Pinblaster]

I wont add anything more than what the other guys have mentioned so far about tuning but I would like to direct you...
here ---> http://www.rc10gthobby.com/mystracing/Nitroind.htm
and here --> http://www.rcnitro.com/rn/articles/super_tune.asp

 

[greenwing7]

oh come on Plaid who honestly doesn't like doing high speed passes LOL