I'm curious to know, what makes you think it will stop lag!
sw20,
Feb 15, 7:59pm
Use the correct gear. Best way of overcoming turbo lag.
andrea_w,
Feb 15, 8:10pm
Antilag!
sw20,
Feb 15, 8:10pm
Sure, if you like replacing your turbo monthly
1ollie,
Feb 15, 8:28pm
Antilag is pretty much old technology now! as with the development of good turbos, good manifolds and good tuning basicly does away with the need.
Also curious to know why that was asked
johnf_456,
Feb 16, 7:12am
also the right size inter cooler will reduce turbo lag also
intrade,
Feb 16, 7:41am
turbo lag is caused by the charger not spinning fast enough to provide enough pressure . nothing you can do about it all you could do is make it worse with a larger intercooler. You could fit a smaller(secound) charger or convert it expensively to a vtg =variable-turbo-gate. theycan boost at low rpm vw tdi have these fitted on 110hp and above. diesel and above porsche and there like also got some and the net has some people experimenting with controllers for these for there cars. but it is not easy to run a VTG on a car with no controller looped in to the engine ecu. http://www.youtube.com/watch!v=KgVrpiFfp8U&feature=related
jsbike,
Feb 16, 9:05am
manual boost control wont do anything except raise your boost. electronic boost control CAN also bring boost ona little sooner as well as raise it. The reason being electronic boost controlers can (depending on model) hold off opening the wastegate until desired boost is reached, my boost controler has a "gain" knob. This is adjusted until boost would spike for a second when 1st coming onto boost, then you take it back a step so it doesnt spike.
jsbike,
Feb 16, 9:09am
the simplest way i have seen to control a VTG was that the computer controled actuator was turfed out and a generic internal wastegate actuator fitted in its place, so the turbo ended up with 2 actuators, one for the internal wastegate and one to move the vairable vanes.
1fordluva,
Feb 16, 6:25pm
Yes,I had and estreet boost controller. It was good as you could set the controller to apply the boost proggresivley or instantly. It would bleed small amounts so the turbo wouldnt spike or hit boost to hard. Technology is wonderfull. A few of the controllers use poppit valves ,others use stepper motors not unlike Icv on your car. Boost taps are an easy and cheap way of rooting your car quickly IMHO.
carkitter,
Feb 16, 10:26pm
A Blow off valve will reduce turbo lag noticeably. A boost tap just bypasses the wastegate causing overboost but without adding extra fuel. This creates a lean mixture condition increasing the heat in the combustion chamber which shortens the life of pistons, rings, valves, the head gasket and causes pre-ignition which reduces performance and again shortens the life of everything above. The condition is worsened when you hit the rev limiter or speed limiter and the fuel supply is cut. What a lot of people don't realise is that fuel has a cooling effect within the cylinder as well as creating power through being burnt. A boost tap is cheap horsepower but usually kills the engine eventually. This is often what causes the boy racers to strip down and heavily modify their engines.
jsbike,
Feb 17, 9:00am
ah no, the ecu adds extra fuel when boost is raised, to a point anyway, The mixture will only go lean when the ecu reaches the maximum amount of airflow/fuel it's mapped to run.
1ollie,
Feb 17, 11:26am
A BOV does not reduce lag at all it increases boost response when your on/off throttle or between gears! A Bleed valve(Boost tap) does not bypass anything or cause overboosting, overboosting is only caused by the owner/mechanic/driver of the vehicle and what a Boost tap actualy does is bleed of small amounts of air to fool the wastegate actuator making it think its boosting what its spring is set to. A Boost tap does not kill an engine a incorectly installed or miss-used or cheap shit one kills engines. "This is often what causes the boy racers to strip down and heavily modify their engines."lol haha and again back to the "boyracer" word! yes because it has to be a "boyracer" thats doing something wrong every time
cypherboy,
Feb 17, 2:39pm
Inject fuel directly into the turbine, that should stop that pesty lag!
gilligan2,
Feb 17, 4:00pm
Just pull the line off the wastegate.
sw20,
Feb 17, 4:10pm
You should really charge for your information. Such insight.
carkitter,
Feb 17, 10:10pm
A boost tap only affects the air flowing into the engine under pressure, it's not in itself connected to the fuel supply. Thus you are relying on hope that the ECU will pick up on the increased airflow and that the injectors, fuel pump and fuel pressure regulator will have enough spare capacity to cope. Hope is not a good way of running a high boost engine long term.
carkitter,
Feb 17, 10:37pm
Boost taps don't automatically kill engines the resulting lean mixture kills them, I believe I made that clear. When I was younger I was friends with several boy racers and spent lots of time rebuilding their engines and removing pieces of piston and ring from the sump as a result of overboosting and lean mixture caused by T-pieces and boost taps. The cost of rebuilding combined with their passion often meant the engine went back together more powerful than it was originially. That's how the horsepower disease starts, and soon, no turbo is big enough. :-) Boost taps can be used successfully when you also use a method of adding more fuel such as bigger injectors, a fifth injector (on 4cyl engines), higher fuel pressure or a chip. Even then air and fuel increases still require proper tuning before any meaningful and reliable gains are found.
jsbike,
Feb 18, 9:34am
Wrong, boost taps can be used successfully without also use a method of adding more fuel such as bigger injectors, extra injectors, higher fuel pressure or a chip and CAN see good gains over standard while not needing any other mods. All efi systems implement some sort of leeway when more boost is added, they then add more fuel. You dont need extra injectors and shit if your not going over the leeway built into the ecu ffs. You're mates are obviously retards and exceeded the built in leeway.
gilligan2,
Feb 18, 10:29am
Most turbo charged cars have a boost limit programed into the ecu.For example when my old rover 220 hit 14.4 psi the mems ecu would cut the spark so as to stop over boost. I know wrxs have this also. I had my rover dyno'd at 14 psi and had it on an analyzer and it was still running a rich mixture. Point being , it was running a safe fuel mix right up to the boost limit thus protecting the engine from lean burn detonation. The only way to go over that limit is to replace ecu and by that stage you would have a better tune. I would suggest the damage you saw in your mates cars was probably caused by running high boost without a decent charge cooling system ie an intercooler , They may have also had a open pod filter in a stupid spot close to the ambient heat of the motor, An ultra hot intake charge is more than enough to damage engine parts on a turbo charged petrol engine.
1fordluva,
Feb 18, 11:31am
Quite true,but the forester I had in standard form and the same engine as wrx turbo did not have boost cut. It depends on the model and what the ecu program is. I was amazed when my boost gauage was hitting 25psi with a tap. All correctly installed,so went for electronic boost controller,with far better results. It did however have speed defender in place.
gilligan2,
Feb 18, 2:00pm
So by What metric is a speed cut defender standard!
1fordluva,
Feb 18, 2:26pm
Unsure as I have have had a cefiro 2.0ltr 6 cyl years ago fresh import non turbo and that just kept going ,where as the forester was 190 kmh,changed the ecu to a 6s sti raand it was 205kph then it would cut. Guess it depends on what series of ecu you get and whom the tuner from factory was.
jsbike,
Feb 18, 3:03pm
Nissan only require the speed signal wire to be cut, done to both my a31 and r33, and a mates r32 no speed limit on the track now :)
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