Discussion in 'Engine Tech' started by Alky V6, Aug 30, 2010.
926.3 cc per second?
926.3 cc/min for each injector is equal to around 1050hp on a V6 Buick
Doesn't the BSFC need to be figured into that hp calculation? Or, are you just picking a common number for that?
I get 1073 HP using .73 specific gravity for the fuel and a .5 BSFC.
Like I said, around 1050hp I made several "assumptions".
Ted: If you are using the BS3 information for your car, that is in #/hour. Knowing what A/F, fuel, etc...you are using, I would say your are using about 1740hp worth of your injectors
This equates to 6.32 Bhp/cid. Equivalent to a 500cid V8 producing 3,162 Bhp
I keep thinking about the Foghorn Leghorn comic where the little chick keeps proving on paper impossible things and explaining it all with his calculator and sliderule
Damn, a regular joe needs a dictionary on hand to read this thread
Correct Cal. I didn't have my morning cup of coffee. It's lbs/hour not CC's
About 1543 HP based on fuel calc using .6 BSFC
is that real wins, or cry until he gets the win? :biggrin:
sorry but I just could not resist.
i came up with 14 percent over the entire run with no tire growth or parasitic
loss threw the trans.The trans guys say the drive train can suck up 4%
You really need to ask a person who deals with dyno numbers day in and day out. A car with a standard transmission can be down in the 10% range as far as hp loss through the drivetrain.
How about these numbers 3400lbs @175.46 1433.39 hp
His turbos advertised rating is 1550 hp That is only an 8 % loss
I also calculated chris and ted at about 11% loss
The one that amazes me is the cruz missles tsm car 3550 @152.9 990.0 hp
This is a gain over the advertised hp the turbo.
As I stated in the other thread. You are using numbers that relate to a quick snap shot of the pass, or a small section of the pass.
How quickly, and how much power comes in early in the pass is going to ultimately adjust your math.
Really, the most accurate way to use a timeslip to accurately judge the rwhp of someone's car is to have very detailed information on the car and as much incremental data points along the run as possible. That way, you can see how much hp is being applied to the ground during different points in the pass.
If a person is only applying 400 to 500 hp at the launch, ramping to 900 hp 3/4s of the way through the pass, and then is only at his max bhp potential for the last 1.5 seconds of the pass, how is a quick snap shot of data at the end of the pass going to account for the fact that the car was laid down for the vast majority of the pass?
Excuse me. I have to get the car ready for this weekend. I've made a major change to the aux fueling transition range. I moved it much higher in the map. The first few passes, I'm sure will be duds until I get the transition range dialed back in.
So then with this thought (I agree BTW) we know we are holding the cars back to maintain traction through the 60' and beyond then using the fuel calc method we can pick a point in the pass where we are hitting it with full power. I think we all can get a good ballpark idea where everybody is at this point. I am not sure what is going on with your converter, but I know from my info I was running 8.4's and slowed down when more power was applied, only to find out with a change that I was leaving a lot on the table the whole time so with that said once the converter is working properly can you label a car making X RWHP because you could be making 1800 BHP and be loosing a ton through the converter at various points going down the racetrack.
Even if the tc is not working right. You can identify that problem.
An in-depth study of a pass where the incrementals are carefully taken into account is the only way to go.
1/4 mph is the best way to tell about the hp from track #'s. 1/8 mph #'s are easily affected by what happens in the 1st 300 feet.
I can and have went the same mph to the 1/4 while the 1/8 was over 4mph off. It makes it look like you gain alot from the 1/8 to 1/4 on the passes where you don't get a good run before the 1/8 but the 1/4 mph is still the same. This can only fool you into thinking your making more power than you really are.
Either way, guessing hp from track #'s are for the ricer crowd. The car either runs the #'s or it don't.
Very good point Dusty. And, that is what I've seen with the sim.
The thing that can throw people off is trying to judge Brake HP using a timeslip without taking the incrementals into account.
There used to be a good video of my car showing this, apparantly whoever was hosting it took it down.
You can clearly see me get sideways and lift, then get back in the throttle and run 184.5. Next pass was 184 on a full run. The difference was on the pass where I peddled, the 1/8mph was 143 rather than 148
That was not my point my point was the results on the track vs the
advertised potential of the turbo.Thats a tribute to some of the best
boys in the country getting it done real world and that's why they bust you on your sig.
They bust me on my sig, why?
Because I'm not producing more than the 91mm is capable of supporting even though I'm using 1.835"/1.5" valves?
I'm not quite getting the point. So, are you saying that they believe I should be able to push this small headed motor to 1600 hp? Really? Do they really believe that? Is that really why they're busting me about my sig?
Nope.... we bust you because your making 700 hp less than the turbo is capable of and you want us to congradulate you on it meanwhile according to your calcs we make more hp then the turbo is rated at, and yet we dont go looking for a pat on the back. Are you clear about what we are "busting" you about now?
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