Air Injection / Antilag....

[Ako]

In my opinion...


It wont help on its own. It WILL help however IF you get the retarded timing going on as well, in which case the extra oxygen being injected will help with the ignition inside the manifold. Seems pretty straightforward to me....

[Malcolm]

by pressurising the inlet tract, I mean everything from turbo -> throttle body. I really don't think there's going to be anywhere near enough air mass to maintain the turbine spinning against the restriction of pressurised air on the compressor side, especially since the thing feeding the turbine is the compressed air that's trying to stop the compressor wheel from turning - infact I think it would probably have less effect than a good blowoff valve

[fivebob]

To provide boost from air alone would require that the turbo was more than 100% efficient, best you could hope for would be to slow the fall off in boost, but probably not by much.

[Ako]

In other words:

Its not worth worrying about unless you get an ECU which can handle it?


sales pitch
Actually.... Theres a gizzmo anti-lag computer (standalone one, has launch control too) in my mr2, you can have it for a small donation, I have no use for it!

[Malcolm]

To provide boost from air alone would require that the turbo was more than 100% efficient, best you could hope for would be to slow the fall off in boost, but probably not by much.

so you're suggesting he upgrades to a ct26 then?

ah...it never gets old

[fivebob]

so you're suggesting he upgrades to a ct26 then?

Only if it's the 450HP variety, I'm sure all those missing HP could be put to good use

BTW how about using a big tank (100litres or so) to store the excess intake air at high pressure instead of bypassing all that exhaust gas down the wastegate. Then you wouldn't need antilag, as you'd have pressure on tap the moment you opened the throttle

Mind you the valves would be quite tricky to get working.

[GT4 20]

To provide boost from air alone would require that the turbo was more than 100% efficient, best you could hope for would be to slow the fall off in boost, but probably not by much.

Slowing down the fall off in boost is defiinately the best I could probably hope for.

sales pitch
Actually.... Theres a gizzmo anti-lag computer (standalone one, has launch control too) in my mr2, you can have it for a small donation, I have no use for it!

Hmm, tell me more
Gary

[fivebob]

To provide boost from air alone would require that the turbo was more than 100% efficient, best you could hope for would be to slow the fall off in boost, but probably not by much.

Slowing down the fall off in boost is defiinately the best I could probably hope for.

Now that I think about it, you would actually lose boost more rapidly (the airs got to come from somewhere), but you might keep the turbo spinning ever so slightly faster.

[GT4 20]

The 'pressure feed' would be directly from the WAI on top of the engine. Very short run with narrow pipework so no serious loss of pressure over the relatively short distance.
Might well be worth trying if I can get the bypass valve to work. Certainly nothing to lose by trying
Gary

[fivebob]

The 'pressure feed' would be directly from the WAI on top of the engine. Very short run with narrow pipework so no serious loss of pressure over the relatively short distance.
Might well be worth trying if I can get the bypass valve to work. Certainly nothing to lose by trying

Unless the turbo is more than 100% efficient you will lose boost pressure. Simple physics will tell you that you can't get out more than you put in.

So, unless the pressurised air comes from another source, it cannot possibly do anything other than lose boost at a faster rate than a closed system. In other words it would be a complete waste of time and will only contribute to lag unless it has excess fuel to combust with in the manifold.

[GT4 20]

What sort of pressure are you looking at in an exhaust manifold with the throttle closed?
Gary

[fivebob]

What sort of pressure are you looking at in an exhaust manifold with the throttle closed?

It would be fluctuating between 90 & 100kpa Absolute for each combustion event.

However that's not relevant. Think of it this way, the compressor is a mass flow device, if you take X mass of air out of the system after the compressor and inject it into the turbine side, there is no way that it will produce enough energy to cause X mass of air to flow through the compressor, so you will lose charge air mass faster than a system that is closed.

If you can get it to do that ,then forget about water powered engines, they're obsolete, you've just invented a perpetual motion device

[Mr Revhead]

gary, hes on to us. ill make the call........


*somewhere far away a black helicopter lifts off.......*

[GT4 20]

[Malcolm]

If you can get it to do that ,then forget about water powered engines, they're obsolete, you've just invented a perpetual motion device

oh god you sound like my electrical theory lecturer. I think he made a similar comment to various students every couple of weeks....