Dysfnctnl85

I actually had to pause this episode of Top Gear to post this, because I'm simply amazed at this car. Although it looks space-age-ish, it not only sounds amazing, it ripped up the Top Gear track faster than the Evo FQ400. It's 2 seconds slower than the Z06, but it also has 150+ less horsepower.



It utilizes this crazy electronic system to take into account throttle position, steering position, and some other stuff to control torque split by the center diff. I'm not even sure if my description is accurate, but I wanted you guys to at least check it out. If you haven't seen the latest episode of Top Gear, here's a link from TorrentSpy: Top Gear 8x05.



So how exactly does this anti-lag stuff work? I must say it's very interesting and one would almost thing it would be practical on not just a track car, but a street car as well.



Anyways, check it out, and I'll try and rip just this car from the episode and post a link.



Here is a link to the active-diff speak: Top Gear this week.

Dysfnctnl85

Someone did the work for me and it's YouTube'd:



Prodrive P2

rotary510

That thing looks and sounds pretty damn wicked. From my understanding, when the anti-lag system senses throttle lift, more fuel is injected but not burned thus hitting the red hot turbo, keeping it spooled so instant power is on tap. Thats why the thing shoots so many flames. Thats how I THINK it works at least. I've heard that the old Audi Group B rally cars had this as well.

toplessFC3Sman

yea, its a rally technology to keep the turbo spooled. However, the extra gas is injected into the exhaust manifold before the turbo (but after the engine), and the hot exhaust gasses and turbine blades are hot enough to ignite it. Basically, another combustion is happening in the exhaust side housing of the turbo when the car is off-throttle and not producing enough hot gasses on its own. Thus, the expanding gasses from this new combustion serve the same purpose as the expanding gasses from the old one, to spin the turbo, even tho the throttle has been lifted. This is also why the car was spitting flames left and right, b/c the gas doesnt actually finish burning til it reaches the excess of oxygen at the end of the exhaust to fully combust.

Dysfnctnl85

Excellent explanations guys.



So now, the big question, how do I get it? LOL.



I'm assuming there are companies that make electronic devices precisely for this purpose. I doubt something like a Haltech would allow for it...I'm wondering what kind of electronics rally cars use...

toplessFC3Sman

you could probably make a system using just a pic or 555 timer for the controller to provide the pwm signal to the injector, but you would need an additional injector installed in the exhaust manifold before the turbo, and the associated plumbing to get gas to it. you would also need to connect the TPS or an additional throttle lift sensor to trip the controller, a boost sensor so the controller knows how much gas to inject and how long to inject it for and probably an override switch to turn it off so in normal driving you arent dumping gas into the exhaust whenever you shift on your commute or whenever. Thats the simplest way I could think of to do it. I dont know if there are any systems out there for this already, but any of them would either run your engine really rich on throttle lift thru the time when boost is built again, or would require another injector in the manifold.

Dysfnctnl85

How much heat do you think a fuel injector can take? I would like to see a manifold for a setup like this...I'll see what I can find.

j9fd3s

the haltech can do it, if you're on the haltech yahoo group, search the archives.



its not done too much, cause its really hard on the turbo.



some systems inject air into the exhaust manifold, along with the fuel, so its in there burning. egt's go way up.

treceb

id buy one.

toplessFC3Sman

ud have to buy a new turbo pretty soon after too... and forget about passing emissions, your cat would be toast (if u still have one)