[Stan Weiss]

Originally Posted by mike leech

Sorry but i don't think you do. There are several factors that effect the cars performance, more than just da. 3% is as close as you'll see car/dyno/a year of tuning, heck radials effect it.

Mike,
There are items which effect et / mph like DA which also reflect a change in HP. There are other items which effect et / mph like traction which reflect NO change in HP.

Stan

[S/st 54]

Thanks for the info Jim! That was good stuff.
My question for those who know is: is the 300rpm per sec
Or the 600rpm per sec and predetermined setting on every dyno and when the motor accelerates that's when the force put on the brake is measured(torque) OR is it the brake is set at Whatever amount of resistance and the torque the engine puts out determines xxxrpm per second????

If that made any sense....is that a valid question?

[johnta1]

From Larry Meaux's forum:

the SF-901 Software + Electronics control the Servo Valve on the Water Brake's discharge
so that in turn sets the amount of Load on the Engine and the Rate of Load -vs- RPM if you choose an acceleration test.

Its a computer controlled acceleration rate .... the Dyno tries to maintain that RPM/SEC Rate as best it can ,
it does vary a bit, but overall 600 RPM/SEC comes out around 600 RPM/SEC on average .

it takes about 1 second to turn the Test Rate knob to your choice
its that easy on a SF Dyno

Anytime you accelerate a mass it take force
the amount of force would be relative to where the mass is distributed from the axis or centerline of rotation ( Polar Moment of Inertia = PMI or POI )
Any rotational mass thats accelerating will loose more and more HP the faster you try to accelerate it .... and that includes any objects in the Absorber or Dyno that are
geared to or accelerating with the Engine

600 HP = So lets say you Dyno your Engine at zero acceleration test rate ( Steady-State )
585 HP = 300 rpm/sec acceleration test rate
570 HP = 600 rpm/sec acceleration test rate

so i ask you.... what HP would you input into a computer program to simulate how quick you would run in 1/4 mile ?

so to be fair and accurate , you would need to input a second value to represent the HP loss to Dyno test rotational inertia

so in a 1/4 Mile DragRace Simulation Program you might input 570 HP along with 600 rpm/sec so it becomes 600 HP @ steady state
or you input 585 HP at 300 rpm/sec and it becomes 600 HP @ steady state in the program
or you input 600 HP steady-state , and it remains 600 HP in the Program
so that all 3 combinations end up or equal to 600 HP in the program

then the computer program now knows the engine puts out 600 HP @ steady-state
now when the RaceCar launches off the starting line and revs + gear changes , etc,
the rpm/sec rate is vastly different from the Dyno rate
so down the dragstrip or track, the engine typically in first gear could be as high as 5000 rpm/sec in 1st gear on a 500 cid ProStocker
the computer program has to keep track of all component rotational inertia losses every .001 second or whatever you use as your time increment or time step .


_________________
Meaux Racing Heads
MaxRace Software
ET_Analyst ( DragStrip Simulation Software )
PipeMax ( Engine Simulation Software )
http://www.maxracesoftware.com

[mike leech]

Originally Posted by Stan Weiss

Mike,
There are items which effect et / mph like DA which also reflect a change in HP. There are other items which effect et / mph like traction which reflect NO change in HP.

Stan

Are you being serious? You cant really think i don't know about da. In a car spinning, it will show less hp due to less et and mph.

[Stan Weiss]

Originally Posted by mike leech

Are you being serious? You cant really think i don't know about da. In a car spinning, it will show less hp due to less et and mph.

Stan

[Badbird69]

Dick, What fuel do you use when you spray your car?


Hi Jack,

We run two separate fuel systems in the car. We run 110 in the main fuel cell for the motor. 110 is available at the pump at several local gas stations that cater to the circle track guys. Also most race tracks we go to sell 110 on site. So it's nice to have a motor that is happy on 110.

The smaller fuel cell on the left is for the nitrous system. We use C16 for that. So depending on how often we get out, a five gallon can of C16 can last a whole season.

Have had no detonation issues with this set-up. The rod bearings looked so nice after the first season, we put them back in for the second season. Seems to be working okay.

Dick

[john marcella]

Originally Posted by Badbird69

Dick, What fuel do you use when you spray your car?


Hi Jack,

We run two separate fuel systems in the car. We run 110 in the main fuel cell for the motor. 110 is available at the pump at several local gas stations that cater to the circle track guys. Also most race tracks we go to sell 110 on site. So it's nice to have a motor that is happy on 110.

The smaller fuel cell on the left is for the nitrous system. We use C16 for that. So depending on how often we get out, a five gallon can of C16 can last a whole season.

Have had no detonation issues with this set-up. The rod bearings looked so nice after the first season, we put them back in for the second season. Seems to be working okay.

Dick

All I see is 90-100 lbs that can come out of that car FAST!

[LiL Jack]

Originally Posted by john marcella

All I see is 90-100 lbs that can come out of that car FAST!

He is light enough already

[69FIREBIRD76MM]

Originally Posted by Badbird69

Dick, What fuel do you use when you spray your car?


Hi Jack,

We run two separate fuel systems in the car. We run 110 in the main fuel cell for the motor. 110 is available at the pump at several local gas stations that cater to the circle track guys. Also most race tracks we go to sell 110 on site. So it's nice to have a motor that is happy on 110.

The smaller fuel cell on the left is for the nitrous system. We use C16 for that. So depending on how often we get out, a five gallon can of C16 can last a whole season.

Have had no detonation issues with this set-up. The rod bearings looked so nice after the first season, we put them back in for the second season. Seems to be working okay.

Dick

very nice set up Mr. Fulton, and your car is Bad ass.
can you post couple more pictures of your car, side, front, engine and interior..will love to see them...thanks