NITROUS OXIDE ( nos / n2o ) advice forum

the right amount of power at the right time to keep the same force over the whole run too
have you got G sensors brain? would be interesting to see the log
next up is front wheel video camera with a ruler next to it
get a graph of front wheel height off the deck against Gs

It's not quite that simple.

I've seen "G" measurements increase as the front wheels fall. This is actually a case where wheel position sensors are more useful.

Superbikes are probably the best example of this type of strategy, as they must apply "control" strategies to the bike while cornering, braking, and accelerating. Drag cars only accelerate while racing. (Normally)

Accurate ride height measurement devices (Ultra sonic) cost more than what most people spend on a quality ECU. Wheel position sensors are "cheap" compared to this method, with 4" of travel costing just under $1k per wheel including termination.

Surely the easiest way is to race it and study the vids?
Then adjust and race again. Thats much more fun

That's the way we do it! Although we now have a data logger we are not recording suspension travel- apparently you need to record at 1000hz for it to mean anything! We have got a new video camera that does 300fps for next season though

As far as G force readings go, the data logger only reads up to 2g - It's pegged whilst the wheels are in the air and you can see a dip in the readings where the wheels touch down. we might add a front wheel speed sensor for next year, so we can match the data up with the g readings

Brain.

Brain!
When at the Pod, see if Ian Blackett (photographer) is on site. You can let him know when you are coming through and he will take good quality slo mo vids from whatever angle you want.
He does mine for me and bungs them on a disk at the end of the day for not too much dosh !
They have proved really usefull for me this year.

Heres an example. The music was my idea

http://www.youtube.com/watch?v=fH2vsboOXbM

Regards
Perry

That's EXCELLENT and just what I need, so anybody know of a reasonably priced camera that can do that?

???

I'll ask Ian what camera he uses for these Trev.

Here's the same car again, but after some advice from Brain. I made these up at home. Old Skool slapper bars. Box section, 1/4" plate and my old stick welder.

http://www.youtube.com/watch?v=-jPYiGzUxhg

I seem to remember it's somewhere in the region of 2,500lbs but Brain will respond now no doubt with the exact figure.

The camera we have just bought is a Sanyo Xacti VPC HD-1010. It was only about £230. I would suggest that Ian Blackett's camera would be a LOT more expensive than that as the images are of a very high quality and are more than 300fps (IMO). Our little Sanyo delivers a small 448 x 336 size video although this is probably good enough for most web applications. Just don't put it on full screen.

That launch looked so much more controlled. Was that with same power, build, etc and how did the short time & ETs compare before & after?

Must have missed that one!

Race weight, incl. the "fat one" , fuel & nitrous, but no weight bars is 2600lbs. We have 2 x 25lb bars that can be fitted in the rear and 4 x 7lb bars for the front as needed.

Brain.

I know the Moroso slide-rule is only a guide but I have 2600lbs and 174mph as 1050-ish horsepower. Were you off the throttle before the finish or was the engine not showing 1300hp on that pass?

Its a Casio EX-F1 camera.

[/quote]That launch looked so much more controlled. Was that with same power, build, etc and how did the short time & ETs compare before & after?[/quote]

Same power etc. But it went from flat 11's to mid 10's and was nearly a second quicker at the 1/8th with 4 more mph. and 5mph faster across the line.

Aerodynamics are starting to play a huge part at those speeds- I don't think Henry Ford ever imagined some lunatics would push one over 170mph.....

A couple of ET calculators I've used have suggested that the MPH for the ET we're running should be between 180-184mph. The data logger shows the G falling away quite rapidly at the top end. Still, it shows how good we are in the early (most important) part of the run......

Brain.

My systems have ALWAYS been better at producing ET's than MPH and as ET's win races that's all I've ever been concerned about.

Now we have the advanced control technology of the REVO/MAX Extreme combination, we'll be able to change that and optimise the nitrous delivery/fuel ratio to achieve the best throughout the entire run.

Trouble is, everyone thinks they're a better chassis tuner than the next guy so mph is the only representation they're looking for, right or not. I know ET wins races but when people with egos don't credit the ET achievements of others (because they believe they're better at it) then the measure of the power production capabilities of a nitrous system have always and will always be on terminal speed.

Quite a good set of engine/drag racing calculators here..
http://golenengineservice.com/html/calculators.html

This one also suggests 1050 hp for 1/8 as well as 1/4 mile times/speeds. It also ties the ET and terminal speeds together, so would suggest some degree of accuracy. I assume the hp figure is wheel horsepower rather than flywheel?

The SE turbo cars, for the most part, have big MPH figures as their launches tend to be, for want of a better word "average". When you consider that the top turbo,blown and BIG inch nitrous cars must all be making over 2000hp,
it makes what we are doing with the '34 even more of a sore point......


Brain.

EFFICIENCY & CONTROL wins over BRUTE POWER every time.

Thats quite good Brain.
My car is 2420lbs and ET of 127.5 gives me 391.47 hp.
The last dyno pull showed 392 so its pretty accurate eh?

Hi Pel, is that with or without you onboard and is the BHP before NOS?
I'm screwed my Beamer weighs 4180 with a fat bastard on board
that's why Viv is quicker

just run the calculator, thats bloody accurate on my performance too

Thats with me and 80 gallons of petrol on board Rich

hmmm, not so accurate for FWD cars, it says with my terminal of 135 I should be running a 10.09 and only have 450 at the fly. (I wish!)