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Gentlemen, Hack Your Engines!
Les Gasser writes "Ahh, drag racing! If you've never experienced the scent of nitro or
the flashing flames of a top fueler running 320MPH+ in 4+ seconds in a
standing-start quarter mile run at dusk, you're missing world-class
performance art. (See 'High Performance' for the classic on drag racing history and
culture). Now the NYTimes (registration needed) has 'Gentlemen, Start Hacking Your Engines,' an article on
're-engineering' engine control computers for maximum performance,
combining the drag racing and tech-geek traditions." Having learned everything I know about racing from Gran Turismo, I'm amazed to learn there's more than just buying a "racing chip".
Here you go, tiger.
get your reg-free link right here.
For real computing in Cars then look at Formula one. Launch Control, Engine Control, Automatic and Semi Automatic gearboxes, traction control etc etc etc.
These are cars that can be remotely re-tuned during a race. From a tech perspective its amazing.
However it ruins what should be a battle of man and machine and enables the big spenders to kill the little guys everytime. Computing is great for some things, but it too often reduces the skill required in sports like Motor Racing, making it a battle of programmers rather than drivers.
Fully automated remote racing with large cars might be quite cool, but what makes it really interesting is that people can make mistakes, and even better take risks that a computer wouldn't think are smart.
An Eye for an Eye will make the whole world blind - Gandhi
Having learned all I know about racing from Mario Kart, I'm surprised they don't just carry some mushrooms and turtle shells.
You may find this interesting, particularly if you're into rallying at all and have heard of both Subaru and Prodrive, who prepare rally subarus and also make a performance pack for road-going cars.
:-)
The new high performance Impreza (STI VII) Prodrive Performance Pack uses a piggy back chip to "fool" the ECU into allowing more boost on its turbo.
The reason? Prodrive don't know how to re-program the OEM ECU correctly.
A third party has hacked a tool to reprogram the ECU - something no-one else has managed. This largely is the work of one guy, who has done something that is apparently not possible
Rumour is that Prodrive will be using the ecutec tool to reprogram ASAP.
Another mate has reverse engineered the ECU for older models and is blowing chips to give increased performance...
ECU hacking has been around for a while. For popular cars, you can get aftermarket ECUs which are tuned for more performance. On a non-turbo, street legal car, the best you can expect is a 10% power increase. On turbocharged cars you could get more (just turn up the boost), but you quickly run into reliability problems because the engine can't handle the increased loads.
To get significant power increases, you still need to apply 'old style' tuning tricks like adding forced induction, changing camshafts and uprating engine internals.
Intensive electronic engine control is a very common thing in racing for 20 years now. What was seen in Fast and Furious is major BS. If you wanna see serious electronic action look into Formula 1. They have all kinds of goodies for decades now. Dynamic fuel mapping, traction control, launch control, braking assistance (this particular one is very cool, the system monitors the dynamic conditions of the car and slows any one of the four wheels without even asking the driver) etc...
Another interesting bit is Mitsubishi Carisma Evo 7.
As far as dragsters go, they are way behind. Nothing special nor innovative.
One last note in the last few years prices of engine management systems went down a lot. You can buy a very good one for couple thousand but as long as you dont have the right tools, you cant tune the car perfectly. and never forget the intake and exhaust systems in your street cars are build to the specs written by suits hence very performance limiting.
Any geek out there who wants to make there car go fast follow the common wisdom:
1. Buy a fast car.
2. Cant afford it and stuck with that peoples carier? First make it corner faster (get good springs and dampers) Fast and Furious style car dragging on the asphalt dont qualify.
3. If you want it to go fast make it lighter (look: Collin Bruce Chapman)
4. Make it stop fast (you might need them)
5. You exhaust system is design to be on the very safe side of noise regulations and fuel economy fix it.
6. You intake design sucks too (dont forget the cylinder head lots of power in there)
7. By now you spent as much as you spent on the original car.
8. Not satisfied get real engine management system. Remember eletromotive, haltec, motec.
Or the alternative and more appropriate road for the ones with tools, garage and time: Locost, some sort of open source sportscar project and it can go very fast.
Peace
Have to agree with this. On non-forced induction cars, all you're doing is removing any safety margin built into the current map by playing with timing. Advancing ignition may give some benefits but runs the risk of det, or pre-ignition, or pinking, or pinging, or knocking or whatever your locality calls it ;-)
;-) ) but runs the risk of det again which'll knacker your engine pretty damn quickly.
With a turbo on the car, things start getting more interesting as you can get more air into the engine, which means it'll need richer fuelling to achieve anywhere near stoich (or even safety
With the Impreza, which is my weapon of choice, the map is incredibly rich before doing anything... The general concensus is that this is done to keep engines from going bang, as out of the box they'll come with between 218 and 275BHP from a 2 litre engine, along with a 3 year warranty.
Tune them simply and carefully and for a little money you'll see high 200s from them. Beyond that, my opinion is that your internals will need some consideration - particularly con rods and those little gudgeon pins which hold your piston heads on.
The fact that people have done what manufacturers think is impossible is a cause for some small celebration in my eyes, and allows the little guys to stick a finger in the air to those who would have them only use franchised dealers with the necessary hardware to talk to the ECUs...
Mind you, it's far more effective to use an aftermarket ECU.
Check out http://farnorthracing.com to see the team website, and http://www.gems.co.uk to download the software I use.
DG
Want to learn about race cars? Read my Book
It could even have a special emmissions test mode
;-)
Some cars already have this built in. Sorry to harp on about the Subaru Impreza turbo, but it's what I know about
Hold 3000 rpm in second gear for 5 seconds, then floor the accelerator. You'll find boost is capped at around 11PSI as opposed to the normal 15PSI.
Reason? The car thinks that it might be being subjected to an emissions test, and opens the wastegate at lower boost. Lower boost = less air = less fuel = better emissions (verrrry simply put)
Yes! There's loads of information out there...
:-)
The interface in some cars is called OBDII (On board diagnostics) - see ODBII.com, which incidentally claims that all cars sold in the US after 1 Jan 96 have to be compliant...
Now the protocol that they use is something else. There's many flavours, but at least you can start hacking should you be feeling brave
There is, of course, open software to help and naturally it's on sourceforce here.
Plenty more information out there - just google.
Not only can the engine management engineer retune the engine on the fly during a race, most of the teams go even further.
Every team has what is called a "7-post shaker rig". This is an electro-hydro-mechanical device that places a hydraulic ram under each tire, plus 3 more attached to the aero centre for feeding in aero loads. By playing back the loads recorded by the car during operation by the position sensors, load cells, strain gauges, and accelerometers though these rams, the engineers can watch the car operate under real racing conditions in the lab.
Well, the bigger teams transmit the telemetry coming off the car during the race back to the shop in England, where the shaker righ data is played back on a duplicate car on the shaker rig in near real-time, so that they can keep an eye open for problems.
F1 has more money and technical ability than can be imagined.
DG
Want to learn about race cars? Read my Book
Kenny Bernstein was one of the leaders in pushing for pit lane analysis via computer...many, many years ago. I believe he's turned that into a side business since then.
It is really impressive what parameters are monitored and what kind of telemetry they employ. F-1 is the same way...tons of analysis done real time. The Japanese (Honda), again, years ago, would transmit telemetry from the car, on the race track, from one of the many tracks worldwide...all the way to their labs in Japan.
For those with a bit more esoteric interest, note that originally, physics types deemed it impossible to obtain trap speeds in the 300mph range...that was before the spinning tire effect was carefully considered.
So, I was looking out of the window at the traffic down below, and I've come to the following conclusion: tune your car all you want. They all wait at the lights at the same speed!
OK, I know... racing tracks, Autobahn etc. I've noticed that most cars seem to be capped at 250-270 km/h (155-170 mph). Mine certainly is, but that's actually fast enough for me. I don't drag race - if anything, I end up sitting in a jam on the Autobahn, at the same speed as everyone else - zero (see first paragraph). So much for having no speed limits. :-(
Now for something completely different: Audi is taking the record industry to court.
It seems that customers have complained that certain CDs won't play in their cars, and Audi wants the record companies to pay to have the car CD players fixed/changed, as they are producing non-standard CDs.
I heard that two days ago from an employee of said company. It must have been an internal announcement; haven't found anything on the web about it yet...
-- Steve
.. Mostly if you have a turbo. Or, in my case, two.
My S4 has gone from about 250hp to 330hp. And I can feel it all. Before and after - the change was amazing.
Sure, I need to be a bit more careful warming up and cooling down the car. I can live with that. And actually, ever since I've gotten the increase in performance, I put the pedal down LESS. That's weird.
There's also some other very cool tuning.. I have a Vag-Tool which allows me to hook my laptop up to the car and monitor (and change) settings/data in realtime.
Since I've had that, I've made the following changes:
- Holding down lock on my keyfob for about 3 seconds will roll up all windows, close the moonroof, *and* lock the car
- The other way around - holding down unlock for a while opens up all the windows, etc.
- My tiptronic transmission now will not automatically shift out of first gear. (VERY NICE)
- My tiptronic transmission now lives in a non-stop "sports mode"
Now, only if this company that makes the interface/tool would provide hooks into the data collection portion of their app - I could write some realtime graphing utilities..
Based on the following, it will be quite some time before the electrics are doing 320+mph and 4s in the 1320.
Some interesting Top Fuel dragster facts:
* One dragster's 500-inch Hemi makes more horsepower then the first 8
rows at Daytona
* Under full throttle, a dragster engine consumes 1 1/2 gallons of
nitro per second, the same rate of fuel consumption as a fully loaded
747
but with 4 times the energy volume.
* The supercharger takes more power to drive then a stock hemi makes.
* Even with nearly 3000 CFM of air being rammed in by the supercharger
on overdrive, the fuel mixture is compressed into nearly-solid form
before
ignition. Cylinders run on the verge of hydraulic lock.
* Dual magnetos apply 44 amps to each spark plug. This is the output
of an arc welder in each cylinder.
* At stoichiometric (exact) 1.7:1 air/fuel mixture (for nitro), the
flame front of nitromethane measures 7050 degrees F.
* Nitromethane burns yellow. The spectacular white flame seen above
the stacks at night is raw burning hydrogen, dissociated from
atmospheric
water vapor by the searing exhaust gases.
* Spark plug electrodes are totally consumed during a pass. After 1/2
way, the engine is dieseling from compression-plus the glow of exhaust
valves at 1400 degrees F. The engine can only be shut down by cutting
of
it's fuel flow.
* If spark momentarily fails early in the run, unburned nitro builds
up in those cylinders and then explodes with a force that can blow
cylinder
heads off the block in pieces or blow the block in half.
* Dragsters twist the crank (torsionally) so far (20 degrees in the
big end of the track) that sometimes cam lobes are ground offset from
front
to rear to re-phase the valve timing somewhere closer to
synchronization
with the pistons.
* To exceed 300mph in 4.5 seconds dragsters must accelerate at an
average of over 4G's. But in reaching 200 mph well before 1/2 track,
launch
acceleration is closer to 8G's.
* If all the equipment is paid off, the crew worked for free, and for
once NOTHING BLOWS UP, each run costs $1000.00 per second.
* Dragsters reach over 300 miles per hour before you have read this
sentence.
Do really dense people warp space more than others?
Why don't you read the F1 rules ?
Transmission
Transmission
Only two wheels may be driven and automatic gearboxes are banned
Each individual gearchange must be initiated by the driver
The minimum number of forward gear ratios is 4 and the maximum is 7
All cars must have a reverse gear operable any time during the race when the car's engine is running