legacycentral bbs

n2x4 wrote:
Don't change maps with your laptop while you're driving. You might lose a floorpan.

By about how much would this shorten a turbo's lifespan?

Well...if I used it constantly, I would probably only get 6 months or so out of a turbo...but that video is the longest time I have done it for in one sitting...so it shouldn't have too much of an adverse affect I would imagine...

*Resurrect*

I am interested in an update about the effects of this long term

I am not overly worried about being hard on the turbo since I would do this with a TD04 and replacing it would cost about as much as an oil change given their prices....

but regardless what have you found the effects to be on the turbo and also the exhaust system?

I don't know when you last had a Legacy or how long you ran the ALS, but any info would be interesting as it doesn't seem many others have done this...

Well, that's not true anti-lag really; that's sort of semi-half-ass-antilag.


True antilag is controlled by the computer as a function of the normal map; without making changes to your normal map it will bump your timing to 30+ ATDC, use a stepper motor or other method to open the throttle to feed the engine and bring the idle up to ~2000 rpms, and that becomes antilag without you touching the throttle.


when you need to raise the throttle to get the effect you're missing the purpose, often in the start of corners the driver is off of the throttle, and it's that no-throttle condition where you want antilag the most.

scuzzy wrote:Well, that's not true anti-lag really; that's sort of semi-half-ass-antilag.


True antilag is controlled by the computer as a function of the normal map; without making changes to your normal map it will bump your timing to 30+ ATDC, use a stepper motor or other method to open the throttle to feed the engine and bring the idle up to ~2000 rpms, and that becomes antilag without you touching the throttle.


when you need to raise the throttle to get the effect you're missing the purpose, often in the start of corners the driver is off of the throttle, and it's that no-throttle condition where you want antilag the most.

First, this is a year old thread. Second, it's -30 degrees +30 is advancing. Third, lag off of no throttle is not where it was originated or designed. I've seen in in rallyx cars for twenty years. In any matter, where is the logic at having boost at 2000rpm anyway? It nowhere near your powerband and it's not even really helping you get there all that much faster. Also, his half ass way really isn't that half ass considering he has to switch maps. It's actually about the same. See he can wire that to a switch just as you should with a vehicle that can do it automatically at any given rpm so that it doesn't interfere with racing etc. Tell me other than autoxing where are you completely off the throttle then back on? This should never happen in racing it's called two footing.

I believe in two step myself and on my supra I pull 10psi off the line. Two step is also much safer than antilag and in some cases more effective. Not to mention the transition between on and off is shorter with two step.

scuzzy wrote:Well, that's not true anti-lag really; that's sort of semi-half-ass-antilag.

Well...it's actually pretty damn close to what the original anti-lag was on the old 555 cars...

The only thing I didn't have set up was my IAC to kick open...but this wasn't really ever meant to be used...it was more of a proof of concept one day when I got bored...



And tturnpaw...if you have ever seen a turbocharged rally car pull out of a corner with no lag...you will understand the place that 10+ psi of boost has at 2000 rpm...

I have. But again he wasn't at 2k, they brake boost. Having paddle shifters allows them to keep em high and not mess with a clutch even in a tight hairpin. A bad driver would let the rpm drop that low. Keep in mind these cars hit nearly 9krpm there is a sound difference between antilag launch and 2k. And were not speaking amateurs here.

Yeah...I'm a rally codriver...so I'm pretty up on the rally cars...and the ones I am thinking of don't brake boost...nor do they have paddle shifters


One WRX that I can think of makes 10 psi on antilag, at idle (which is 1800ish)

Now I see the confusion. I was talking professionals. Search buxley hairpin @ edrom on YouTube or something. Notice the fast cars have revs built as they handbrake into a negative degree hairpin. Slow ones bog out losing a few seconds in the process.

so..... any help on my inquiry?

Nick?

I don't have a cat to worry about but is ALS hard on the downpipe?

I have never heard of anyone hurt anything using antilag other than the turbine blades of the turbo. And even then it's not all that common. Between all the people that run it and all the different variables it's a rare occasion it happens. Aem has antilag look at how many people run that compared to their failure occasions. Not many. It's really up to you. How much you use it race it etc will determine the outcome. And if it happens you rebuild. Holding it on antilag for an extended period of time is like asking for problems. If you're really that worried about it run two step which is much safer for extended use.

thanks for the input tt, I will look into two step and everything

not really worried, just curious to hear people talking about their first-hand experience

It's a concern but shouldn't keep you from running it, only overusing it. I've run two step at least a hundred times on my supra. Between drags and even drifting no issues. I used it to stay within my powerband and not overrev as my ecu doesn't have a rev limiter.