Anti Lag
03-05-2007, 01:28 PM
#11
0.0 BAR
Join Date: Feb 2003
Posts: 0
Re: Anti Lag
Originally Posted by samson
He wants to spin a large turbo off the line and not have lag that you normally would
03-05-2007, 01:34 PM
#12
3.0 BAR
Join Date: Mar 2005
Posts: 3,161
Re: Anti Lag
Originally Posted by BLAAST
about the anti lag...
I have some customers who reported making an amazing anti lag system with a simple hack of the clutch switch, basically making it cut the spark between shifts, resulting in an intentional backfire in the manifold that happens right as you release the clutch after each shift. I would love to test drive one. Sounds pretty turbo-destructive to me but it apparently works amazingly well and i know it's been a years old trick.
I have some customers who reported making an amazing anti lag system with a simple hack of the clutch switch, basically making it cut the spark between shifts, resulting in an intentional backfire in the manifold that happens right as you release the clutch after each shift. I would love to test drive one. Sounds pretty turbo-destructive to me but it apparently works amazingly well and i know it's been a years old trick.
It's been named "Bang Bang" and I'll try to find the vid of it active on a 9sec Lexus. I'd do it too, but there is a massive surge of heat that I really don't trust stressing my turbo/manifold. Not ideal for a DD in my mind.
Actually I always thought that at the point of clutch depression there was a massive amount of retarded timing to produce lots of exhaust gas to keep the turbo from slowing down?
Oh yea, you got a PM. I need to ship my turbo out to you and I have time to package it being spring break and all.
EDIT: Found it:
Click here to see VideoJP
03-05-2007, 02:05 PM
#13
1.0 BAR
Join Date: Nov 2005
Posts: 478
Re: Anti Lag
Anti lag systems are pretty neat. I have looked at a ton of different ways of improving "lag". When I ---- up coming out of a corner and get the car down on RPM it seems like forever to get it up on the pipe again.
This is what I did in the computer program. In the far bottom left corner in the (high rpm and high vacum) I added lots of fuel and retarted the spark. This increases exhaust temps during off throttle activities, shifting, and braking(without clutch) On the dyno it ***** out a pretty large flame, out on the track it is pretty bright out so it doesn't get notice.
Randy
PS Blasst you will be seening the turbo soon for a next session rebuild and maybe upgrade
This is what I did in the computer program. In the far bottom left corner in the (high rpm and high vacum) I added lots of fuel and retarted the spark. This increases exhaust temps during off throttle activities, shifting, and braking(without clutch) On the dyno it ***** out a pretty large flame, out on the track it is pretty bright out so it doesn't get notice.
Randy
PS Blasst you will be seening the turbo soon for a next session rebuild and maybe upgrade
03-05-2007, 04:02 PM
#14
0.0 BAR
Thread Starter
Join Date: Mar 2007
Posts: 26
Re: Anti Lag
Originally Posted by samson
It's been named "Bang Bang" and I'll try to find the vid of it active on a 9sec Lexus. I'd do it too, but there is a massive surge of heat that I really don't trust stressing my turbo/manifold. Not ideal for a DD in my mind.
Actually I always thought that at the point of clutch depression there was a massive amount of retarded timing to produce lots of exhaust gas to keep the turbo from slowing down?
Oh yea, you got a PM. I need to ship my turbo out to you and I have time to package it being spring break and all.
EDIT: Found it:
Click here to see VideoJP
03-05-2007, 04:05 PM
#15
Guest
Posts: n/a
Re: Anti Lag
Originally Posted by BLAAST
about the anti lag...
I have some customers who reported making an amazing anti lag system with a simple hack of the clutch switch, basically making it cut the spark between shifts, resulting in an intentional backfire in the manifold that happens right as you release the clutch after each shift. I would love to test drive one. Sounds pretty turbo-destructive to me but it apparently works amazingly well and i know it's been a years old trick.
I have some customers who reported making an amazing anti lag system with a simple hack of the clutch switch, basically making it cut the spark between shifts, resulting in an intentional backfire in the manifold that happens right as you release the clutch after each shift. I would love to test drive one. Sounds pretty turbo-destructive to me but it apparently works amazingly well and i know it's been a years old trick.
03-05-2007, 05:27 PM
#16
1.5 BAR
Join Date: Oct 2004
Posts: 877
Re: Anti Lag
a ON and OFF switch? why not? I don't see a problem adding that.
Thinking about it, it's an even better anti lag than we may think...
Because after all, if spark is cut when the clutch is depressed, you no longer need to let off the throttle between shifts really... You stay floored, just like a power shift, but you can engage the gear easily because the spark is cut, you release the clutch, the throttle never closed, the BOV never blew off and you always remain on your initial spool up as long as you stay floored! makes sense?
Thinking about it, it's an even better anti lag than we may think...
Because after all, if spark is cut when the clutch is depressed, you no longer need to let off the throttle between shifts really... You stay floored, just like a power shift, but you can engage the gear easily because the spark is cut, you release the clutch, the throttle never closed, the BOV never blew off and you always remain on your initial spool up as long as you stay floored! makes sense?
03-05-2007, 06:55 PM
#18
0.0 BAR
Thread Starter
Join Date: Mar 2007
Posts: 26
Re: Anti Lag
Originally Posted by BLAAST
a ON and OFF switch? why not? I don't see a problem adding that.
Thinking about it, it's an even better anti lag than we may think...
Because after all, if spark is cut when the clutch is depressed, you no longer need to let off the throttle between shifts really... You stay floored, just like a power shift, but you can engage the gear easily because the spark is cut, you release the clutch, the throttle never closed, the BOV never blew off and you always remain on your initial spool up as long as you stay floored! makes sense?
Thinking about it, it's an even better anti lag than we may think...
Because after all, if spark is cut when the clutch is depressed, you no longer need to let off the throttle between shifts really... You stay floored, just like a power shift, but you can engage the gear easily because the spark is cut, you release the clutch, the throttle never closed, the BOV never blew off and you always remain on your initial spool up as long as you stay floored! makes sense?
hmm sounds interesting...using this application you wouldn't be blowing up the mixture in the exhaust manifold and with a decently sized turbo you might be able to make it work with no lag...is there any way you could get more info from one of the people you know that's running it?
03-05-2007, 09:54 PM
#19
0.0 BAR
Join Date: Feb 2003
Posts: 0
Re: Anti Lag
Originally Posted by Shizuma
From what I’ve read there’s two different kinds of ALS, the first is where you’re just retarding the timing on the exhaust in order to let the gases keep the turbo spooling, the second involves injecting MORE fuel (and in the case of the st205 more air via an air injection system)
Originally Posted by Shizuma
and actively trying to ignite it pre-turbine to keep the turbo spooling….obviously the second is more harmful to the turbo…..
I've seen more than one turbine wheel pop off the shaft from extreme EGTs due to retarding too much timing. A lot of engines won't last long enough to trash the turbo, tho, the exhaust valves get cherry red and start preignition... GVR-4 366/2000 killed a big 16G and a 20G that way, the engine lasted through it because not only did it have sodium filled valves from an Evo8, but first gen 4G63 are ------- indestructible. I wouldn't try it for long, or often, in a Honduh - Honduh engines are pretty resilient when tuned correctly, but they are fragile when the tune is off.
03-06-2007, 03:22 AM
#20
0.0 BAR
Thread Starter
Join Date: Mar 2007
Posts: 26
Re: Anti Lag
Originally Posted by Joseph Davis
I've poked at the only ST205 swap into an ST165 in North America. It's an honest to god WRC engine, too. Interesting ride.
Not really.
I've seen more than one turbine wheel pop off the shaft from extreme EGTs due to retarding too much timing. A lot of engines won't last long enough to trash the turbo, tho, the exhaust valves get cherry red and start preignition... GVR-4 366/2000 killed a big 16G and a 20G that way, the engine lasted through it because not only did it have sodium filled valves from an Evo8, but first gen 4G63 are ------- indestructible. I wouldn't try it for long, or often, in a Honduh - Honduh engines are pretty resilient when tuned correctly, but they are fragile when the tune is off.
Not really.
I've seen more than one turbine wheel pop off the shaft from extreme EGTs due to retarding too much timing. A lot of engines won't last long enough to trash the turbo, tho, the exhaust valves get cherry red and start preignition... GVR-4 366/2000 killed a big 16G and a 20G that way, the engine lasted through it because not only did it have sodium filled valves from an Evo8, but first gen 4G63 are ------- indestructible. I wouldn't try it for long, or often, in a Honduh - Honduh engines are pretty resilient when tuned correctly, but they are fragile when the tune is off.
