Anti-Lag system for a street car...

anyone have experience with these? http://www.suprastore.com/spquspva.html

Sneaky Pete?

Cotton wrote: anyone have experience with these? http://www.suprastore.com/spquspva.html

This looks like it shouldn't be destructive at least.

Geekspeak's turbo bypass valve would be helpful and nondestructive as well.

GameboyRMH wrote:

Cotton wrote: anyone have experience with these? http://www.suprastore.com/spquspva.html

This looks like it shouldn't be destructive at least. Geekspeak's turbo bypass valve would be helpful and nondestructive as well.

No hands on experience, but there's threads with dyno results of them floating around. They DO make a big difference.

compound turbo

Raze wrote: compound turbo

Sometimes, it really IS the answer!

isn't the answer called a clutch?

yamaha wrote: isn't the answer called a clutch?

I find that that answer usually comes with sky high IATs, heatsoaking, and belt issues when trying to actually you know... make real power.

OK, so then I agree a compound turbo is a E36 M3load better than the dumping of raw fuel into the turbine.....

Raze wrote: compound turbo

This is the answer for me, unfortunately the cost ruled it out initially. I'm running a large single on my truck, but twins are what I really need. I'm still debating moving to twins, but in the meantime water/meth injection or something like that mechanical quick spool valve may be the way to go.

Internet said: Celica GT4's ran oxygen through metal turbes into the exhaust manifold during throttle lift off, in conjunction with the ecu retard timing to about 40* (retarded) and the addition of an extremely rich fuel dump they were able to delay the combustion enough to where it would occur while the exhaust valves were open and thus keeping the turbo spooled.

Cotton wrote:

Raze wrote: compound turbo

This is the answer for me, unfortunately the cost ruled it out initially. I'm running a large single on my truck, but twins are what I really need. I'm still debating moving to twins, but in the meantime water/meth injection or something like that mechanical quick spool valve may be the way to go.

Confused here.

I have somewhat limited turbo knowledge, but my understanding is that a properly sized and piped single will be similar in spool time as similarly sized and piped (yes the piping can be more efficient, hence 'similarly') twins. You also said compounding. Did you -not- mean twins?

tuna55 wrote:

Cotton wrote:

Raze wrote: compound turbo

This is the answer for me, unfortunately the cost ruled it out initially. I'm running a large single on my truck, but twins are what I really need. I'm still debating moving to twins, but in the meantime water/meth injection or something like that mechanical quick spool valve may be the way to go.

Confused here. I have somewhat limited turbo knowledge, but my understanding is that a properly sized and piped single will be similar in spool time as similarly sized and piped (yes the piping can be more efficient, hence 'similarly') twins. You also said compounding. Did you -not- mean twins?

My single is on the large side, so I guess you can say it isn't "properly sized", but I need to move a lot of air to keep the EGTs down. A smaller turbo feeding the monster would cure my lag issue. Here is the turbo I'm running: http://www.industrialinjection.com/shop/product/phatshaft-62-70/

I got it with the 14cm exhaust housing.

This is not antilag. Antilag keeps the turbo spooled while having the engine create very little torque so it doesn't push through the brakes, all while the throttle is closed.

Ok, so the throttle is open... But if you're running stupid rich, retarded timing, and skipping spark events, you're not making torque and you're not pushing through the brakes.

Conquest351 wrote: How would you design a street friendly anti-lag system?

Get rid of the turbo?

Sorry, I will now go back to lurking, and leave the productive discussion to those with more forced induction experience.

In reply to ae86andkp61:

Productive discussion? Where? Let me know if you see any more of that mess and we'll see if we can get rid if it!

does anyone think that a liquid co2 method would work? by pumping the co2 directly infront of the supercharger you could keep its speed up, and vary the opening and closing of a electric valve to the co2 based on manifold pressure, anyone have the software to test this idea? co2 turns from liquid to gas at 800 psi, so as long as your exaust pressure is lower than that ill add to the pressure in the exaust manifold, and since its stored in liquid form, a medium sized bottle (2.5lb and its fairly common) would last for quite a long time, only thing is i know that c02 likes to be very cold when it expans from liquid to gas, anyone have any concerns or ideas to this???

Interesting idea (I guess that by "supercharger" you mean "exhaust turbine.") CO2 does get cold when it decompresses so thermal expansion/contraction at the injection point could be a problem.

thats where my concern comes in, im deciding if i should try this on my f focus, but id rather not crack the exaust manifold from thermal shock, and your right i did mean exaust turbine, only thing is ive no idea what i should do about the injection point and i dont know if the co2 being as cold as it is compareatively to the turbo will damave the turbine itself or the houseing for that matter,

I doubt it would damage the turbine, by the time the gas reaches the turbine after mixing with exhaust gas it won't be so cold, I'd be worried about cracking the exhaust manifold...I think you'd want to inject the CO2 at a shallow angle so it won't cool one small spot on the opposite manifold wall, and it should be as close to the head as possible.

well i guess all thats left is to try it, just have to figure some way to make a check valve at the injection point so the manifold wont leak pressure once the co2 is removed

<-- didn't read whole thread, but how about this? Put a small brake on the crank pulley/belt drive. Brake would load against engine allowing you to put pedal to WOT and get turbo spooled up (just like brake torqueing an automatic). Fuel/cam/spark timing would all be untouched.

Obviously there would be numerous methods to control such a system, but I'd think if it were just for launching, a secondary e-brake connected to said brake would be pretty easy to do.

In reply to ProDarwin:

People do that with the main brakes already, called brake boosting. Primarily something ricers do when racing from a roll.

Kenny_McCormic wrote: In reply to ProDarwin: People do that with the main brakes already, called brake boosting. Primarily something ricers do when racing from a roll.

Yup. This would just allow you to do it from a stop with the clutch disengaged.

Similarly, with a DBW throttle body, and some electronic control over the brake in said system, you could keep your turbo at full spool between shifts and during "off throttle" corners in autox without using the main brakes.

Or just use an automatic trans with a well-matched torque converter.