Some new Dyno numbers

[slownrusty]

I was getting the car sideways in 3rd gear even with the DR's on last night. BOO. . .

 

 

Showoff.....BOOOOOOO!

[spork]

I assume you're using a wideband right? If so, use the lamda reading and there will be a lot less guess work. You can tune for the same number regardless of how much methanol you are running. Obviously, the best way would be on a load based dyno, but for most guys that just gets to expensive, so go with the targte Lamda number. I'm running 6 M5 nozzles on mine with a dual pump setup, and may upgrade to some larger nozzles later if need be. The single pump on mine was @80psi (running all out). I haven't checked to see what it is now with both pumps running. Methanol is definetely the way to go!

[Clifton]

Meth has a different lamda number. Unless you change that on the wideband.

 

Nice numbers. Do you have a sheet so we can see the curve? Was this on 91 pump too?

[Bernardd]

Meth has a different lamda number. Unless you change that on the wideband.

 

Nice numbers. Do you have a sheet so we can see the curve? Was this on 91 pump too?

 

don't mean afr #? there's a chart on the techedge website with lamda values and the afr values for various fuels.

[spork]

The lamda number stays constant, the a/f number will change. Here's a chart to go by.

 

Vout Lambda Petrol LPG Methanol Diesel

 

1.40 0.686 10.08 10.63 4.39 9.94

1.45 0.696 10.23 10.79 4.45 10.09

1.50 0.706 10.38 10.94 4.52 10.24

1.55 0.716 10.53 11.10 4.58 10.39

1.60 0.727 10.69 11.27 4.65 10.54

1.65 0.739 10.86 11.45 4.73 10.71

1.70 0.750 11.03 11.63 4.80 10.88

1.75 0.762 11.20 11.81 4.88 11.05

1.80 0.774 11.38 12.00 4.95 11.23

1.85 0.787 11.57 12.20 5.04 11.41

1.90 0.800 11.76 12.40 5.12 11.60

1.95 0.814 11.96 12.61 5.21 11.80

2.00 0.828 12.17 12.83 5.30 12.00

2.05 0.842 12.38 13.05 5.39 12.21

2.10 0.857 12.60 13.29 5.49 12.43

2.15 0.873 12.83 13.53 5.59 12.66

2.20 0.889 13.07 13.78 5.69 12.89

2.25 0.905 13.31 14.03 5.79 13.13

2.30 0.923 13.57 14.31 5.91 13.39

2.35 0.941 13.84 14.59 6.03 13.65

2.40 0.960 14.11 14.88 6.14 13.92

2.45 0.980 14.40 15.18 6.27 14.20

2.50 1.000 14.70 15.50 6.40 14.50

2.55 1.037 15.25 16.08 6.64 15.04

2.60 1.078 15.84 16.70 6.90 15.62

2.65 1.121 16.48 17.38 7.17 16.26

2.70 1.169 17.18 18.11 7.48 16.95

2.75 1.220 17.93 18.91 7.81 17.69

2.80 1.276 18.76 19.78 8.17 18.50

2.85 1.337 19.66 20.73 8.56 19.39

2.90 1.405 20.66 21.78 8.99 20.38

 

 

To quote from (Donnie Wang) on Turbo buicks (since his explaination is clearer than mine probably would be)

 

"For any given stoich mixture for any given type of fuel or mix of fuels, there will be a certain amount of residual oxygen after a perfect burn.

 

Methanol with a stoich of 6.45 to one will have 'X' amount of oxygen in the exhaust after it is burned.

Nitro with a stoich of 1.7 to one will have 'X' amount of oxygen in the exhaust after it is burned.

Simple gasoline with a stoich of 14.6 to one will have 'X' amount of oxygen in the exhaust after it is burned.

The 'X' amount for all three previous examples will be very close to the same. This is the thing that the lambda sensor is monitoring. Not the actual A/F ratio of the fuel mixture being used. It is measuring residual oxygen molecules after the fuel is burned to judge how efficient the burn was. Perfect (stoich), rich, or lean. It is looking for that 'X' amount. The A/F numbers you see on your O2 reading are simply numbers that relate to the fuel mix that the sensor is setup for. Most, if not all, sensors are setup to read out A/F numbers as it relates to burning gasoline. The programmer of the unit has just assigned a certain A/F number to each lambda reading. See 'The Chart'."

 

Here's some other info that may be found useful as well (pure gasoline vs. Pure methanol)

 

Gasoline / Methanol

 

6.0 / 4.1 - Rich Burn Limit (engine fully warmed)

9.0 / NA - Black Smoke / Low Power

11.5 / 4.5 - Approximate Rich Best Torque @ WOT

12.2 / 5.5 - Safe Best Power @ WOT

13.3 / NA - Approximate Lean Best Torque

14.6 / 6.45 - Stoichiometric AFR (chemically ideal)

15.5 / NA - Lean Cruise

16.5 / NA - Usual Beast Economy

18.0 / NA - Carburetted Lean Burn Limit

22+ / NA - EEC / EFI Lean Burn Limit

 

 

These numbers above are approx. of course.

[Clifton]

Bernardd, Spork,,

 

Thanks for clarifiyng. Lamba is lamda. It is the afr multiplier that needs to be changed for it it display different AFR's. I just spent the last half hour on the Innovated board reading to see what I misunderstood when I last read it.

[Garrett76Zt]

Meth has a different lamda number. Unless you change that on the wideband.

 

Nice numbers. Do you have a sheet so we can see the curve? Was this on 91 pump too?

 

Thanks man, It will probably be wednesday before I can get the dyno sheet posted up. This was on 93 pump and meth injection. I'm happy with where it is currently, I want to make a strong/safe showing at SEZ, but I think when I get back I may finish tuning. I want to make some small fuel adjustments, a little more intensive timing adjustments and another pound of boost or so. I think 450whp should be pretty easy.

[Garrett76Zt]