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Old 06-24-2008, 06:19 AM   #1
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Default 20% byrons gen 2 in a c6bbT

will it be ok to run byrons 20% in this motor??? what do i need to do about shims, remove one??? or just leave it alone? thanks!
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Old 06-24-2008, 06:49 AM   #2
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Do nothing!!! Break in the motor with Byrons and set your needles and go. Most motors are set up stock up to 25%. I run 25% Gen II and have a C6bb7t with no problems! Some will shim their heads .1 for 25% or more but for 20 leave it alone.
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Old 06-24-2008, 07:49 AM   #3
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what is the real difference in running 20% or 30%? my local hobby shop is short on byron 30 gen 2 so I figured I would just start running 20
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Old 06-24-2008, 08:32 AM   #4
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If you have been running 30 with no problems you could probably get by with pulling a .1 head shim for 20 but I would leave it alone and enjoy the slight mileage increase.
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Old 06-24-2008, 03:28 PM   #5
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just do a proper break in, tune your engine and enjoy! Byrons is excellent fuel, and the C6 is an awesome motor. you have a great combo! riiipppp
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Old 06-24-2008, 03:50 PM   #6
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Im running the 25% gen2 with 11% oil in my rb s7 l2g. I did break it in with 30% tq fuel and since running the byrons I did have to richen it up quite a bit. The warmest my engine got with the gen 2 was 245 but it was 90+ degrees that day with lots of humidity. I gonna stick with 25% gen 2 byrons for now on as long as it treats me good. Also rb engines are made to run no higher than 25% nitro with out re shimming, but I didnt re shim and it was fine
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Old 06-25-2008, 09:55 AM   #7
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what rea difference am I going to notice running 20% over 30%....I know there is 10% nitro content difference but.......also I have a vspec I have been running on 30%...will I have to richen or lean it out switching to 20%
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Old 06-25-2008, 11:01 AM   #8
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it wont smell as good melvin.. that is all you will notice!! lol
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Old 06-25-2008, 11:26 AM   #9
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The difference between the Byrons 20 and 30% is just the nitro content. The higher the nitro, the greater the punch or increase in torque. I run 25% Byrons and swear by the stuff. It has the punch like 30 but with the ease in tuning and cooler running like 20. 25% has a higher oil content like 20%. 30% has a lower oil content.. 9% (I think) vs 11%. Plus, with 25% there is no real need to reshim or run a cooler plug.
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Old 06-25-2008, 12:42 PM   #10
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Quote:
Originally Posted by GHETTOTEACHER View Post
The difference between the Byrons 20 and 30% is just the nitro content. The higher the nitro, the greater the punch or increase in torque. I run 25% Byrons and swear by the stuff. It has the punch like 30 but with the ease in tuning and cooler running like 20. 25% has a higher oil content like 20%. 30% has a lower oil content.. 9% (I think) vs 11%. Plus, with 25% there is no real need to reshim or run a cooler plug.
16%, 25% and 30% Gen 2 are all available in 9% or 11% oil. The Pro Driver is the 9% stuff.
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Old 06-25-2008, 08:46 PM   #11
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ok thanks guys, so i started to break my c6 on 20% now if byrons keeps producing 25% i am going to switch to that, will this cause any trouble??
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Old 06-25-2008, 11:31 PM   #12
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none, just re-tune your engine and rip!

when my local hobby shop ran out of 30%, i brought a gallon of 20% and i ran just fine the entire weekend. im sure some can tell a difference, but i couldnt and have been contemplating on running just 20%..its cheaper for a reason im sure, but i couldnt tell.
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Old 06-26-2008, 11:57 AM   #13
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It's cheaper because it has less nitromethane in it and nitromethane is the most expensive ingredient in the fuel.

Most people would probably run quicker on 20%.
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Old 06-28-2008, 10:18 AM   #14
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ok guys, got my c6 broke in, it is great.........but the stock setting are 3.5 on the top, and 5 out on the bottom..........i ended up llike couple hours lean on the top from stock and i am like 6 or 6.5 on the bottom out....could this be right, motor is running 227F, and running great.
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Old 06-28-2008, 10:30 AM   #15
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If it's running right it is right.

Different pipes and different fuels can require radically different needle settings. I once had a new motor that with my pipe, fuel and weather conditions was several turns too lean with the factory settings.
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