i love technology
That anti-lag system has been around for years. Practically every turbo race car uses it if the rules don't specifically forbid it. WRC (given their "turbo import" status) are probably the most famous, as well as drag cars.So, the Prodrive anti-lag system works by keeping the little propellers spinning and forcing lots of lovely oxygen into the engine even when there aren't enough exhaust fumes to turn them normally. And it does this by dumping petrol into the exhaust, just before the little propeller. As soon as the petrol touches the very hot exhaust pipe it explodes and this explosion keeps the propeller turning
there is no misinformation here. i have and drive a GVR-4 with a big 16g (i also have an R32 GTR). as well, my friends drive Evos, and i have driven theirs. i know what turbo lag is. my car has it, as do the Evos. i can dial down lag to a very small amount and it always seems like too much. and the newest version of the 911 turbo has zero perceptible lag. any "actual" lag that can be detected on a dyno, for example, is between [email protected] and sub 2000rpm --a negligible area of the power band. the variable turbos of the Porsche begin boosting at sub 2k rpm. this is so soon that the boost is on before any "wait" is considered relevant. i urge that you look into it yourself. read up on your Porsche stuff, as that is a roadcar often forcing other makes to bend to it's will. the GTR must heed this to remain a relevant force.Lets have a show of hands here. Who has actually driven a turbocharged car before and knows what the **** turbo lag is? I think I'm reading a bunch of misinformation from a few on this site.
Turbo lag is a result of the turbo being passive during cruise/low load situations. The turbo must have hot, voluminous exhaust to drive the turbine. The more you have, the quicker the turbo will spool. The most common variables to change are turbine (hotside) size and compressor (coldside) size. For every engine, there is an optimum combination for the desired power level, at full boost. Depending on the size (pumping power) of the engine, the turbo may have to be oversized and slow-responding to hit the desired power level.
Positive displacement superchargers, on the other hand, are great because they are compressing intake air full time when the engine is running. Crack the throttle and you have instant boost--the supercharger doesn't give a sh!t about your exhaust energy. On the other hand, you have to feed the turbo some throttle to get your reward.
Another big function of turbo lag is the volume of your intercooler and associated piping. Not only do you have to develop your p.s.i. in the intake manifold, you have to develop the p.s.i. first in the intercooler and piping before the engine. This can take a few milliseconds, but is certainly perceptible part of the lag equation.
Variable vane turbos have been around for years. They were incredibly popular for a time in the 1990s, but they had a high failure rate and were expensive and complicated to repair. There is nothing magic about variable vane turbos. They still have lag because, after all they are still driven by exhaust gasses, but the ability to hit full boost is shifted further down the powerband due to the added efficiencies allowed by the variable vanes.
No, I wouldn't say.the 997tt builds boost before 2000rpm. you're idling at around 1000. you barely accelerate into 1st and you're at 2000rpm nearly instantly. for all purposes, there is zero lag on the 997tt. any lag that is technically/mathematically present is irrelevant. wouldn't you say?
Lets have a show of hands here. Who has actually driven a turbocharged car before and knows what the **** turbo lag is?
Yeah, I'd agree with that. I just won't call it "zero-lag" because it will be there, but certainly it'll redefine what people think is possible with a turbocharged car.but regardless of how any of it works, if you are a spirited driver of the 997tt, and you have nearly full-on power when you've barely begun to accelerate, this creates virtually negligible perceptible lag, as i have stated previously, regardless of actual lag. and the lag present is very, very --very-- small.