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Old 04-29-2009, 11:12 PM   #1
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Default 20% or 30% nitro

what should i be running i have a b3 pro an moded p7r and a sportwerks 21 v2 right now im running 20 im a missing anything from not using 30
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Old 04-29-2009, 11:26 PM   #2
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30%, just watch your engines temp on hot days and don't lean it out too much
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Old 04-30-2009, 07:03 AM   #3
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I like 20% better, but Im crazy!!
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Old 04-30-2009, 07:13 AM   #4
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I think it depends on the engine!
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Old 04-30-2009, 07:15 AM   #5
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20% is better. your motor will last longer and run better. unless your a pro you wont even know the difference.
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Old 04-30-2009, 07:19 AM   #6
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I use 20%. I don't have any trouble keeping up with people running 30%.

However, someone told me that 30% runs cooler than 20%. I passed that info along to other people and I'm beginning to wonder if I'm passing on misinformation.

Anyone know the real truth on that?
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Old 04-30-2009, 07:39 AM   #7
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If Im not mistaken you have to run 30% at a high mixture(rich) because of the higher nitro content. Otherwise your engine will get hot. I myself just started running Byrons 25%. For some engines your required to add a shim to the head for 30%. To prevent all that shimming and rich mixture stuff why not just use what the engine requires. Im not a pro and I want to keep my engines as long as possible. 20% or 30% you won't be able to tell the difference. I find that running 30% feels good on the track, but I kill my engines prematurely. With todays quality mills available, you won't loose a step using 20-25%.
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Old 04-30-2009, 07:57 AM   #8
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In almost every case running 20% will result in slightly higher temps and longer mileage at proper mixture settings but we're talking about a small difference. Fuel passing through the engine is also a big part of the engine's cooling, more fuel takes more heat away out the exhaust. Temp isn't really important, it's just an indicator to help choose which direction to go if the engine isn't running satisfactorily.

Nitro is an oxygenator, it brings o2 with it, therefore more fuel can be burned in a cycle, this is also why 30% fuels usually have less oil content by percentage, with more overall fuel passing through the engine, a lower percentage of oil results in the same amount of oil in the engine overall.
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Old 04-30-2009, 08:34 AM   #9
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ok so now what if the motor was shimme for 30 an im running 20 will that hurt anything
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Old 04-30-2009, 08:49 AM   #10
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No, nothing will be damaged. You may want to go one step hotter on the plug. There might be a little performance to be gained if you lower the deck height by removing one thin shim but if you don't know the measurments it's probably better not to change it.
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Old 04-30-2009, 11:26 AM   #11
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20% does run a little warmer. If you go to 30 you might need to change plugs too, depends on the motor. when you add more nitro you usually need a hotter plug because nitro doesn't burn as easily.
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Old 04-30-2009, 11:32 AM   #12
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Quote:
Originally Posted by Miniracer23 View Post
20% does run a little warmer. If you go to 30 you might need to change plugs too, depends on the motor. when you add more nitro you usually need a hotter plug because nitro doesn't burn as easily.
Actually the higher the nitro the colder the plug.
Low nitro fuel usually has higher oil therefore needing a hotter plug to burn the extra oil.

I run a hot plug regardless though. Better idle and still fast as heck if you use Werks fuel.
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Old 04-30-2009, 11:33 AM   #13
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My local "sponsored: racers here told me to run 30% - and they told me that it runs cooler - and so farIm running about 40 degrees cooler- ? ? ?

That is just what I was told by PROS - so dont chew my head off haha
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Old 04-30-2009, 11:37 AM   #14
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Quote:
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My local "sponsored: racers here told me to run 30% - and they told me that it runs cooler - and so farIm running about 40 degrees cooler- ? ? ?

That is just what I was told by PROS - so dont chew my head off haha
Pretty much my experience. The amount of oil in fuel isn't important. More oil= more heat retention. Lesser HIGHER quality oil will yield better performance and lower running temps.
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Old 04-30-2009, 11:51 AM   #15
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Quote:
Originally Posted by token View Post
My local "sponsored: racers here told me to run 30% - and they told me that it runs cooler - and so farIm running about 40 degrees cooler- ? ? ?

That is just what I was told by PROS - so dont chew my head off haha
If you're running 40* cooler then you're probably still too rich (changing from 20% to 30% withough changing settings will result in a rich mixture), it shouldn't be that large a difference.
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