hey all. was driving through the city a few months back and a black R34 came past, hit boost and shifted right next to me. "bang" i stop at a red light, look back and "bang" again on his next gear change. gathered it was backfire or something.. trolling youtube a while back and a video caught my eye. an evo taking off and haveing the exact same thing. found out its called anti-lag. http://www.youtube.com/watch?v=BZ-i7UurGn8 so trolled more and found 1 300zx on youtube with it filmed also http://www.youtube.com/watch?v=hqiuV-YpCn4 seemed incredibly hardcore, nothing for street use, although the evo set up seems like it could be. what im wondering is, what exactly does it do? obviously, it can be applied to a 300zx, but what would be involved in this? also another quick noob question.. external wastegates. what are they, and what do these do? im guessing they can be applied to a 300? but again what would be needed? thanks in advance guys. kindest regards. rod.
so the first video isnt anti lag? the 34 had it every gear change when he passed like the evo.. im a little confused on it all. :S so its just like a bee R* system?
Antilag is practically to get the turbo up to boost by giving it heaps of timing and fuel. for better launches
the R34 was probably just tuned rich. Dave Fleming's old R33 used to backfire when I used compression braking in the mountains. there isn't much space in a zed engine bay for external gates. suggest googling what a waste gate is before asking can zeds use external gates. yes they can but if you're running big enough turbos which need external gates you're doing well. all the bolt on kits out there are more sensibly sized turbos which work fine with the small integrated / internal wastegate.
yeah i googled it but not much of an explination out there. and by all means i will not be running one/two. driving TT on P's is crazy enough. just thinking for my next project.. ahhh k. gear changes aswell? thats the bang..?
That first vid he probably has the blowoff valve venting into the exhaust manifold before the turbo. this is another type of antilag. this way when you change gears you get a heap of air expanding in a hot manifold this keeping the turbo spooling. hence the real crisp crack between gear changes
1st vid.. Actually this car is equipped with Anti-lag from factory.. There are two opening in the exhaust manifold that open between shifts that let ambient air into the system and allows for combustion in the turbo manifold which keeps the turbo spooled.
Hey Rodsta, Antilag is a system that makes the engine produce enough exhaust gas to spin the turbo at idle. Hence, when you plant your foot, the turbo is already spinning fast enough for instant boost. As far as i'm aware, this is implemented in software (ie through an aftermarket ECU). A lot of rally cars use anti lag i'm pretty sure. I'm also fairly certain that it's illegal on the street. Legality issues aside, the major downside of running anti-lag is that because of the amount of exhaust coming out all day long, you get a significantly reduced life of your exhaust side - the exhaust as well as the turbo. For a racing car that's backed by a funded team this isn't an issue, since changing these components is part of the team's budget. On the road? I'm guessing changing exhausts and turbos every 6 months will get expensive! Hope I helped. Cheers, -Kirill
Ok, to answer your waste gate question. Know a BOV pretty well? Basically works the same way physically. Controlled by vacuum and boost pressure of the engine by throttle position, the waste gate actuator opens and closes the gate that controls boost levels from your turbos. When closed, this forces all exhaust through the turbine causing it to spool up giving you boost. When open, this allows the gases to bypass, so no boost. This is also how boost levels are regulated. Now, internal or external, they are the same in that sense. Just vary greatly in performance. To run externals, you need custom manifolds wich have an extra pipe for the wastegate, Turbos with no internal wastegates (or weld them shut), custom piping from the wastegate, back into your exhaust after the turbo...and the space for it all. Or screamer pipes which are for lazy people who like to "gate it" and are very illegal. They're just a short piece of pipe leading no where and scream really loud when it reaches desired boost level and the gates open. You tube it, sounds cool! You really only want to do this if you need to, because of your turbos lacking wastegates and if you are really pushing for power. No chance in hell they required for a TT, but awesome for big single setups! Bigger wastegates have far better control of boost levels over standard too. Don't do it just for the sake of having externals, waste of money!
thanks kirill. cleared it all up ! wasnt planning on doing it, just loved the sound. pretty tough. wow thanks again. im a noob at the turbo scene and its great knowledge for me, so thanks for the reply. I actually have a mate with a screemer pipe but i dont really see the purpose of them.. so they just a pipe from the back of the turbo ? but where? just youtubed, and sounds awesome but no idea how it will work! wow thanks mate ! i wish i could have a set up like this.. fantastic haha. thanks everyone.
Remember that it's a gate. Similar to exhaust valves in the heads. One side of the waste gate is mounted to the exhaust manifold at the heads. this bypasses the gas away from the turbo when required to do so. The other side of the gate is the exhaust side where it rids the gases. This is supposed to be plumbed back into the exhaust. A screamer is just that piece of pipe that isn't plumbed back in. Here's a cheap way to run a poofta pipe without all that expense of a new set up!
This thread is overflowing with wrong... 2 step launch control is what you want. http://www.msdignition.com/uploaded.../RPM_Timing_Controls/8734_instructions(1).pdf
Also, you can have a "screamer pipe" without an external gate, you know how most dump pipes (pipes that join right at the rear of the turbo) are split? That is, there is one main pipe for the turbo's exhaust to come through, and usually a smaller little pipe that's for the wastegate's exhaust. This smaller pipe will join the large main pipe a little further down, separating the wastegate's exhaust from the turbo's exhaust, and then reuniting the exhausts again into one. Well, in a screamer setup, that smaller pipe from the wastegate doesn't go back into the main, just sticks out and goes straight to atmosphere. -Kirill
so i just get this from nengun? and thats an already set up screamer.. thanks for all the help guys. much appreciated!
My Burgundy Z has external wastegates. It's interesting to look at the difference in exhaust piping and how they squeezed it all in
haha because? legality issues? cheers man. on stock turbos? i would be very keen on seeing your set up! is there a mass gain from doing this?
