BOV venting to exhaust(pre turbo)

[barryogen]

good bloody point
that could mean that even though the experiment may be a success(in that it actually works) it may be unusable for normal road going car.

[matt dunn]

A couple of things you may not have thought of.

You loose almost all of your engine braking as the throttle is open.
You loose brake assist, as you are no longer pulling a vacume when off throttle.
You loose vacume assisted steering.

So change gear, throttle off and you have to work harder to steer or brake. Not really acceptable in any car.. but tollerable in a rally car.

Correct, but only in systems where the throttle is opened off the stop,

just venting the BOV into the exhaust manifold like suggested at the start of this thread will not have those effects,

but I doubt it would have any anti-lag effect without the throttle open though

[barryogen]

Went for a drive in a friends 712HP road legal evo with bang bang anitlag on and off, just to see what it does.

scary car that one, and then with anti-lag turned on, even scarier... faarrrkkk.

It was a bit gutless below 4000rpm, but once on boost, eek.
Can't say I'm a fan of driving with it turned on.

Back to this type... from reading of others using this type of anti-lag on a road car it only really works for ~0.2-0.3 of a second at best, so really only enough to keep the turbo spinning(at least a bit more than usual) should you mis-shift. Should know tomorrow if it all works as we're testing the mates car.

[matt dunn]

So obviously you must have some connection from the exhaust manifold to the BOV.

How do you plan on keeping the heat from the exhaust radiating back through the sysytem and melting anything rubber or plastic on the intake?

Would be great to see a picture of the pipework.

[barryogen]

How do you plan on keeping the heat from the exhaust radiating back through the sysytem and melting anything rubber or plastic on the intake?

we used a small pipe, ~10mm, with a one way valve that was scavenged from some plumbing stuff he had lying around... but errr, melted it after about 10 mins. the valve was meant to be high temp, but I guess the exhaust was higher, no great surprise there.


The good news is that it did work until that point, not steller, and I wouldn't say it was worth the effort...

That is... unless you left it pumping fuel, which would just make it pretty much like proper anti-lag, and would kill turbos kinda quick.

[RedMist]

ST205 uses banjos on the exhaust manifold through to stainless pipes. These pipes run for 300 odd mm then mate to rubber hosing that then mates to the antilag valve. Considering there is currently no intake air running through the pipework they should be the hottest they are possibly going to get. The rubber doesnt melt, infact in a 13 year old installation they appear very good.