Nitromethane from RC Car Fuel?

[Richard L]

If you have so much more fuel available, why not use more nitro?

[sdminus]

Thats kinda the plan. I can use the extra fuel to add a little saftey untill i reach my final ratio of nitromethane. With The quantity im adding in at the moment at 35 deg air charge there is noway its all atomising properly and must be going in wet. I have got to try and get some more nitro from some place but im am drawing blanks so far

[Richard L]

Nitromethane is now a "controlled" substance. A gallon of Nitromethane will do a great deal of damage in the wrong set of hands. I think you can get this from:

[sdminus]

I will try and call them again tomorrow and hopfully source some.

Before i try again with a stronger mix im in two minds as what to do with the afr's and timing.

I have seen a reduction in knock at peak torque and what seems like a slight shift in its position on the data log. Also the afrs are filthy rich. By at least 7 % richer.

Do i leave it all as it is and up the amonut of nitro and use the excess fuel as a safe guard ( I think it will lean out again when i fettle the mix )

OR

Re tune the boost cells and run the same mix.

Scott

[sdminus]

G max are really hard to buy from. You have to give them so many details.

Im gonna have to drop the nitro plans for now and tune with water meth.
I need to race in may and test in april.

In desperation i used 20% niro mix RC fuel. I was injecting with a map sensor driven ramp up in delivery. This was up to a peak of 4 GPH at full boost 1.10 Bar. ( boost varies from 0.98 bar to 1.10 bar) There was no noted gain from the logs.
I loged the following
100% water
100% Meth
50:50 water meth
10:74:18 nitro meth edl oil ( RC fuel)
20:70:10 nitro meth edl oil ( RC fuel)
And a contol measure with no injection
These were all logged at a peak fueling of 90% of 44GPH with a ramp to 4 GPH of additional mix

I used the same ramp on the same strech of track (LOL) on the same day at similar charge temps
The clear performance winner was 100% water which i was surprised about.
I didnt alter my tune for any of the runs,


I have the details of these logs. ( all apart from egt ) if any body wants further details let me know.

If i can get the pure nitro i will go for the 50:50 mix or a metered 100% nitro. ( 100% nitro would only give me 10% of my over all fuel in nitro )

I have other jets which total 8 GPH so far.

Scott

I have been working from some figures complied which indicate the max amount of water of water meth you can add to XX air temp and achieve good atomisation. Does anybody have details for nitromethane. In all the above tests i was injecting way to much mixture. I have simince done a 50:50 meth water tune and reduced my afrs to 11.8 afr. I am yet to get an egt to see the exact implications of this, However the previous AFR was in the mid to low 10's at 1.10 Bar

[mike_g60]

so what this is saying is that unless you intend to ge the car tuned to suit the injection mix the only thing that will help performance is a standard water mix? i currently run a 70/30 mix of water and methanol , i was thinking of trying R/C car fuel but i am not sure its safe now.... only thinking of a 60/30/10 mix of water/meth/nitro, will the oil in the R/C car fuel have an effect in small ratios such as 10% ?? tried a small mix today and it all wnet cloudy

[sdminus]

I have now re tuned for 50:50 but want to go 70:30 when i have more time.

When i pulled the plenim of the car for inspection you could smell the RC fuel. You could also see the oil on the throttle flaps.

To get a benefit from the nitro i would say you need qa very high mix of it. Maybe like richard said 50:50 nitro meth. OR add 100% nitro into a very rich fuel map.

I have gained a bit of power back in my re tune and have pulled fuel back from 10.7 to 11.8.

I like the fuel addition of methanol. t makes the tune easier.

Scott

[raddy]

Hi
I just tested 100%nitromethane injected by the coolingmist ( www.coolingmist.com ) WI kit. I dont know exact size of nozzle (it is 216-360hp range). With injection of pure nitromethane I can feel some power gain, but not massive. Timing is stock, 15Bdeg BTDC, without any det. Pure nitromethane can be probably used with larger nozzle in my engine, until it will induce dets...

[sdminus]

Did you datalog your runs at all. or do you have any more info at all

Scott

[raddy]

Sorry, I havent any logs. But as I said, power gains was not massive, my nozzle is about 0.5mm size....Becouse of price of nitro I will use just water and raise boost pressure.