what causes the differance?

[gst25401]

I went to the track this past weekend, and noticed something. Why does the same type of car(ex. evo or srt4) using a anti-lag of some sort sound differant? Some are the whoop pop pop pop and some crack and bang and sound like they blew a hole in their block. what causes the two differant types of sounds? Is it a built motor doing it?

 

[spyderturbo007]

Basically Antilag refers to a process where the timing is retarded so far that the valve is open in the middle of the combustion cycle. This causes still burning exhaust gases to rush past the turbine housing and keeps you from losing boost between shifts. It also helps spool the turbo at the line.

Or you might be referring to the stutterbox feature that allows you to go WOT at the line and the ECU regulates rpms for you. For example, I can set up DSMLink to hold the rpms at, lets say, 4k below 5mph even if the throttle is at WOT. That way, all you have to do is dump the clutch. No more trying to hold the rpms at the right launch rpm. It pretty much uses fuel cut to hit the target rpms, so it sounds like you are bouncing off the rev limiter. Is that what you are talking about?

DSMLink will allow me to do the antilag, but I'm too much of a wus to try it out. Same with the stutterbox feature.

I really need to grow some balls, or at least ask my wife to give them back.

 

[TSG59_Steve]

Stutterbox is one of my favorite things on link

 

[gst25401]

Yeah, I think I had the two mixed up. Im talking about a 2-step or stutterbox whatever you want to call it.
Im just curious as to why some guys have the short pops and other guys boom and crack at the line?

 

[spyderturbo007]

Stutterbox is one of my favorite things on link

Do you use the Antilag feature? I've heard it's murder on transmissions, or maybe that's the stutterbox feature.

 

[turbosax2]

Do you use the Antilag feature? I've heard it's murder on transmissions, or maybe that's the stutterbox feature.

You're thinking of antilag - specifically the no lift to shift part.

Edit:
This is from the DSMlink user's guide

ALS is only active with the throttle down at least half way and only during launch
conditions (speed less than 5 mph). Optionally, it can also be activated during shifts with
the clutch in (speed greater than 20mph) by checking Enable clutch control. Like the
shift rev limit, it's assumed that you have wired in the clutch switch for this functionality
to work properly.

 

[gst25401]

Or you might be referring to the stutterbox feature that allows you to go WOT at the line and the ECU regulates rpms for you. For example, I can set up DSMLink to hold the rpms at, lets say, 4k below 5mph even if the throttle is at WOT. That way, all you have to do is dump the clutch. No more trying to hold the rpms at the right launch rpm. It pretty much uses fuel cut to hit the target rpms, so it sounds like you are bouncing off the rev limiter. Is that what you are talking about?


Yeah thats what im talking about. So why do some cars sound so different?

 

[turbosax2]

Yeah thats what im talking about. So why do some cars sound so differant?

Part of the difference in sounds is no doubt caused by the variance in the rpm's they're launching at. I don't think this would completely change the sound though, maybe just make it louder.

 

[gst25401]

Part of the difference in sounds is no doubt caused by the variance in the rpm's they're launching at. I don't think this would completely change the sound though, maybe just make it louder.

I agree rpm's most likely make a differance, But the differance is major. One srt4 just popped and putted alittle, but another boomed and cracked like a thunder storm.