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DRR Pro
Picture of Wallace Cleaver
posted
Let's say you had a stack injected BBC on alcohol that's 13.1 compression. Let's also say your track was closing for good and you had a race at the end of the year where all bets were off. How much nitro could a guy safely run for one pass and not kill the motor. Asking for a friend.....


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Posts: 38 | Location: UT | Registered: January 01, 2015Reply With QuoteReport This Post
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Read thoroughly.....
Nitro Intro
Takes a lot of ignition lead to get the slow burning nitro to make good power.
Good luck!
BW
 
Posts: 182 | Location: Rock><Hard Place | Registered: February 20, 2010Reply With QuoteReport This Post
DRR Top Comp
Picture of Curly1
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There are a lot of variables but from my experience if it is in fact 13 to 1 you could probably get away with 20% and as long as it is under 30% you do not need to fatten it up or change timing. I would go into burnout a little cooler than normal and WATCH YOUR WATER TEMP because it builds heat faster and you do not want it to get too hot (Detonate). Also add about one quart of Toluene to one gallon of Nitro to help prevent detonation. Even 3% of Nitro will burn your eyes and choke you if the wind is blowing on you.

Use Hygrometers and get the mix perfect. Even small percent like 2 or 5% will make a difference in performance.


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"Dunning-Kruger Effect"
-a type of Cognitive bias where people with little expertise or ability assume they have superior expertise or ability. This overestimation occurs as a result of the fact that they do not have enough knowledge to know they don't have enough knowledge.

Before you argue with someone ask yourself, "Is this person mentally mature enough to grasp the concept of a different perspective?" If not there is no point to argue.

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Posts: 3962 | Location: United States of Texas | Registered: April 02, 2011Reply With QuoteReport This Post
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Picture of wideopen231
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Go to FIE and read spuds nitro notes. 30 to 35% before making lot of changes. You will have lot higher stall on converter since tq goes up about same percentage at the nitro, well according to Spuds tq calculators.Accoring ti calculator and conversation with FTI my combo will be aboput 700 rpm higher with 20 to 25% load. As for smell at 20% I can smell it but is eye burning strong.now this is from guy who use to inhale deep when they fired TF cars. Use to being key word not now days.

With 13:1 your about same as A/Fuel cars run,little higher. I would sart at about 10 to 15%.little rich( if fell need which its not) and tune from there.You will probably end up leaner than alky set up when final. Again Read spuds nitro notes a lot of good info and its free.
Importance of system maintenance is dbl,but still just basic. Flush system at end of day,spay some lube in it for o-rings and should be good. Changing o-rings to ethylene propylene is not bad idea either. Works with alky and nitro just does not like gas.

If you do math a 20% mixture is cheaper than a lot of the upper end racing gas and a 20% boost(roughly) it TQ to boot. Oh yea and sounds cool as he11 .

Caution use of this product can be addictive and cause bankruptcy. Disclaimer done.




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Posts: 4162 | Location: Greensboro NC | Registered: May 24, 2011Reply With QuoteReport This Post
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Picture of sr4440
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I ran some test on the dyno and at 13 to 1, 30% is a little much,you might get into some detonation, although if your "friend" is at altitude he might get away with it. I would stick to 20% to be safe and you will notice the difference.
also because nitro is so much heavier them methanol, you can leave the jetting the same until 30%.

joe

This message has been edited. Last edited by: sr4440,


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Posts: 1297 | Location: TEXAS | Registered: February 07, 2003Reply With QuoteReport This Post
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PS.. Dont forget to post your results
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Posts: 61 | Location: MN | Registered: August 02, 2005Reply With QuoteReport This Post
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Picture of Lenny5160
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I ran something around 5% for one pass, once upon a time, trying to make a Quick 16. I thought nobody would notice, but the exhaust smelled about the same as 90%!

I can't remember what the gain was, but it was surprising although we fell a few thousandths short of qualifying.


Tony Leonard
 
Posts: 3148 | Location: Inver Grove Heights, MN | Registered: March 18, 2004Reply With QuoteReport This Post



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Picture of Wallace Cleaver
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Thanks gents! My friend just figures since its the last race ever here, and he has an FED, that it would be fun to say he did it once. We should be around 5000' DA if the weather is right and the car should be in the 8.20's on alky. Would be delighted to put a lowly 468' with iron heads into the 8.0's....

I'll keep you posted on "his" decision and subsequent results. Have to be careful though. We have the ET Finals the next week in Vegas and can't hurt the car before then. LOL


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Posts: 38 | Location: UT | Registered: January 01, 2015Reply With QuoteReport This Post
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Well as “his other friend” when he blows it up I will post pictures of the carnage. Some peoples kids these days – Geezs!
 
Posts: 166 | Location: Salt Lake City | Registered: January 16, 2012Reply With QuoteReport This Post
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Picture of Big Steve
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I ran 10% on a few occasions a couple of years ago with a Rons Terminator with mixed results, only picked up maybe a tenth at best in the 1/8th and a couple MPH. Warming up in the lanes would piss off everyone around you for sure lol
 
Posts: 2399 | Location: Moving back to the door side | Registered: April 30, 2010Reply With QuoteReport This Post
DRR Top Comp
Picture of Curly1
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I think if your compression is 13 to 1 or less and you keep it 20% or lower it will be okay.
Remember to put some Toluene in there.
Should pick up and run the 8.00 easy. More compression than 13 or more than 20% it will start eating parts and spitting out pieces.


https://postimg.cc/gallery/np3zpruo/
"Dunning-Kruger Effect"
-a type of Cognitive bias where people with little expertise or ability assume they have superior expertise or ability. This overestimation occurs as a result of the fact that they do not have enough knowledge to know they don't have enough knowledge.

Before you argue with someone ask yourself, "Is this person mentally mature enough to grasp the concept of a different perspective?" If not there is no point to argue.

4X NE2 CHAMPION. 2020 TDRA NE2 Champion
 
Posts: 3962 | Location: United States of Texas | Registered: April 02, 2011Reply With QuoteReport This Post
DRR Sportsman
Picture of Dave Koehler
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Wallace,
A little bit of sunshine.
Unless that engine has been blueprinted and actually measured out at 13:1 it may be only 12:1 or less if it is based on catalog specs.

If the latter you have a little extra wiggle room for %.

But yeah, 20% on a BB will likely get that 8.0 or better.


Dave Koehler - Koehler Injection - http://www.koehlerinjection.com
Fuel Injection - Nitrous Charger - Nitrous Master Software - Balancing
99% of fuel injection problems are electric.
 
Posts: 351 | Location: Urbana, IL 61802 | Registered: December 03, 2003Reply With QuoteReport This Post
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Picture of bill masiello
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You might want to start at about 10 percent and take a good look at your plugs each run !Work your way up from there ! My compression is over 14.0 but I run a long duration cam ! With straight methanol my car runs mid 7 thirty's on M5 7.28 best and with 15 percent a 7.11 best ! Yes it dose work just don't get too greedy !
 
Posts: 64 | Location: shelton ct | Registered: November 21, 2008Reply With QuoteReport This Post
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