Your Definition Of Turbo Lag

[Shale]

You know I'm posting in this thread because it gets people rarked up, right. Thumbs up to the dorks that took offence. I know some of you in real life...ain't that a b!tch.

And bigger thumbs up to those that point fingers. I don't JUST drive N/As, Einsteins.

As a matter of fact I took a WRX for a thrash tonight, and had a decent play on/off boost thinking about this thread specifically. Yeah, stuff happens the moment you plant boot - especially in the correct rev range, as correctly stated above, above the boost threshold.

I can STILL sense a difference between foot down, and full boost. While the penometer says that makes the car feel fast, it's just plain annoying for me around Scenic Dr. In fact as fate would have it, I did two runs in the same direction today, once in the N/A and once in the WRX ;D Just so it all gelled.

The difference between boot down and full boost is there. It's minute, and it's picky to pick it...but I picked it. So there. Nyah.

Not to say it ain't fun ;D

[aim]

 Bazza-NZ']

[quote name='Stoffa said:

Lag as I understand it is b]the time ot takes to go from full boost in one gear to full boost in the next gear[/b]. i.e if you nail it and change gears as quick as you can, a car with alot of lag will take longer to get back on full boost.

I was told its not the time it takes your entire intercooler system to pressurise when you first make your car come on boost.

Think about it again - Transmission isn't a factor at all

Stoffa is talking about the time after you change gear to get back to full boost, not the speed of the change - which i think you have confused it with

HOWEVER Auto do tend to have less lag overall because the auto transmission Subaru run a smaller turbo (in most cases - not all)

Smaller turbos have less lag as they require lest exhaust gases to get them spooling.. etc

Small Turbo = Quick Spool but Lack Top end power

Larger Turbo = Laggier but great top end power

His explaination didn't fit his statement. I see what he means now. Which I agree with. I know the difference and relationship between turbo inertia, exhaust, revs and boost. His statement sounded like he was including the time it took to shift...

[DRFVDR]

if u want boost with no lag

either run an anti lag system on your turboed car

or fit a supercharger

[Treecrusher]

Anti lag, hell yea. Nothing like 4 foot flames shooting out your exhaust as you slow down for the lights ;D.

[zarnah]

hmmm my link can run anti-lag ;D how do I get around the whole having no vacuum to the brake booster though? had a play with the hand controller and it was set up running antilag when I got it and it sounds frickn meeeeeeean at idle!

[Guest crunchy]

lag: lack of turbo response between gears

threshold: initial turn on point for boost based on turbo sizing

sooner you see it the sooner its disappears

[Shale]

Anti-lag? NOW WE'RE TALKING!

[Swindog]

Theres two ways to set it up. BUT be careful cos your turbo will melt like a knob of butter.

One way is pumping heapsa a fuel in and the other is boosting and timing retard i think, cant quite remember. Its been awhile.

Youd be better turning that off and turning flat shifting on.

[zarnah]

yea the way the dude who sold me the link explained it was that it just jets fuel on the decompression stroke so unburnt fuel goes straight through the cylinder and out the exhaust port, hits hot exhaust and bang, kinda uses the exhaust manifold as an extra cylinder for spooling the turbo. needless to say, i will NOT be playing with this feature....... unless its set up by a pro haha

[Shale]

And have a turbo you're not overly fond of

Is this one of the many reasons those very expensive rally turbos only do several thousand km before being replaced?

[zarnah]

meh, 5 hundy for a half decent vf22, if I got a few thousand kms of anti-lagging, flame throwing, scare the shit outa people at the lights fun outa it, it be worth just buying a new turbo every few months haha

[Guest crunchy]

 zarnah said:

yea the way the dude who sold me the link explained it was that it just jets fuel on the decompression stroke so unburnt fuel goes straight through the cylinder and out the exhaust port, hits hot exhaust and bang, kinda uses the exhaust manifold as an extra cylinder for spooling the turbo. needless to say, i will NOT be playing with this feature....... unless its set up by a pro haha

not quit

normaly the throttle is held open between 15-30% then the ecu retards the timing to control rpm then the ecu induces a misfire every 360-720 depending on the amount you need to bring up boost.

you cant run a blow valve with antilag due to no engine vacuum thus you need a pedal box as brake boosters dont work,there is many other ways of doing it without the heat like another wastegate and a second butterfly infront of the turbo.

the modern day anti lag used now is alot different nd not so aggressive

[Guest]

 Shale said:

Is this one of the many reasons those very expensive rally turbos only do several thousand km before being replaced?

the general rule on vf rally turbos is they are lifed to only 1000km

[aim]

 crunchy said:

not quit

normaly the throttle is held open between 15-30% then the ecu retards the timing to control rpm then the ecu induces a misfire every 360-720 depending on the amount you need to bring up boost.

you cant run a blow valve with antilag due to no engine vacuum thus you need a pedal box as brake boosters dont work,there is many other ways of doing it without the heat like another wastegate and a second butterfly infront of the turbo.

the modern day anti lag used now is alot different nd not so aggressive

That's cool. needless to say, I don't think I need it

[Treecrusher]

 crunchy']

[quote name='zarnah said:

yea the way the dude who sold me the link explained it was that it just jets fuel on the decompression stroke so unburnt fuel goes straight through the cylinder and out the exhaust port, hits hot exhaust and bang, kinda uses the exhaust manifold as an extra cylinder for spooling the turbo. needless to say, i will NOT be playing with this feature....... unless its set up by a pro haha/quote]

not quit

normaly the throttle is held open between 15-30% then the ecu retards the timing to control rpm then the ecu induces a misfire every 360-720 depending on the amount you need to bring up boost.

you cant run a blow valve with antilag due to no engine vacuum thus you need a pedal box as brake boosters dont work,there is many other ways of doing it without the heat like another wastegate and a second butterfly infront of the turbo.

the modern day anti lag used now is alot different nd not so aggressive

This may be a noob question, but if I was to hit my brakes while the engine was at full boost would the brake booster not work? i.e in a turbo car you only get optimal braking when the turbo is "off".

[Guest boostin]

It will work a couple of times, but once the vacuum is drained, no, the brakes will be very unresponsive.

[Treecrusher]

 boostin said:

It will work a couple of times, but once the vacuum is drained, no, the brakes will be very unresponsive.

Well, I won't be telling the other half that little piece of information.