I'm wondering about something (turbo lag).

1171 Views 11 Replies 8 Participants Last post by cshepley, May 26, 2002

graunie

Discussion Starter · May 16, 2002

I heard some import guys talking about a nitrous system that engages on ly at low rpm to help reduce turbo lag. It makes lots of sense. You don't need to dump your clutch and the engine isn't getting extra wear because it doesn't really work with the turbo.
On the other hand I always thought nitrous wasn't used at low rpm. I'm now confusing myself so I'll let someone clear this mess up.

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Phoenix

· #2 · May 16, 2002

As far as I know...you don't. NOS is used at higher RPM's as an intense burst of highly flammable liquid to blow your car forward. To use it in lower gears, at lower RPM's (like during turbo lag) would be pointless. You would max out the gear faster than you could shift. Not only that, NOS is used (I'm pretty sure...someone correct me if I'm wrong) primarily for street racing. I don't think a commercial car company would mass produce an expensive street racing mod like NOS into all their cars.

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super_bean21

· #3 · May 16, 2002

Wrx Sites?

hello people.... they are called spool up kits. a little NOS at low rpm's to spool up the turbo faster, eliminate lag, extra umph before boost. And they are all aftermarket kits. you can buy one, turn it of/on when you please. constant NOS would get really expensive. ....and nos is a gas.

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Phoenix

· #4 · May 17, 2002

Thanks for clearing that up

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TiTaNiuM sAMuRai

· #5 · May 18, 2002

So what are the downsides of a spool-up kit?

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jbhebert

· #6 · May 20, 2002

On a similar note, I read somewhere that the WRC cars have a system that causes an explosion in the exhaust manifold right before the turbo to spool it up instantly at low RPMs. Kinda like an intentional backfire. They said it completely eliminates the turbo lag.

Not too practical for a street car, as it likely puts a lot of stress on the turbo and other components.

J.B.

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STiWant1

· #7 · May 20, 2002

Has anyone tried adding a supercharger to a turbo'ed car? The idea worked too well on the Group B Lancia Delta S4. So well, the cars went so fast, no one could drive them safely, hence no more Group B.

Basically the concept is that the supercharger works at relatively low boost and at low rpm and it gives more torque low down so the turbo can spool up. Reducing the spool up time is the key to reducing turbo lag, but strap on a supercharger, map the chip, and bammo!!!

no turbo lag.

Come on with all the mod junkies out there... has no one tried this???

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cshepley

· #8 · May 21, 2002

You would probably want an electro-magnetic clutch so you could dis-engage the supercharger when the turbo spools up. Mechanical superchagers rob a lot of power from the engine, power you don't want to be using up driving a pump when you don't need to.

STiWant1 said:
Has anyone tried adding a supercharger to a turbo'ed car? The idea worked too well on the Group B Lancia Delta S4. So well, the cars went so fast, no one could drive them safely, hence no more Group B.
Basically the concept is that the supercharger works at relatively low boost and at low rpm and it gives more torque low down so the turbo can spool up. Reducing the spool up time is the key to reducing turbo lag, but strap on a supercharger, map the chip, and bammo!!! no turbo lag.

Come on with all the mod junkies out there... has no one tried this???

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Agent Chobos

· #9 · May 21, 2002

Mad Max had a clutch of some kind on his blower. The unit used in the flick was just for show of course. The Aussie company Weiand or Weiland or something was the manufacturer, but they never actually made one that could be engaged & disengaged at will.

Maybe someone else does? I thought I read somewhere that one of the new superchargers for the Focus could do that. I agree it would be cool.

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jbhebert

· #10 · May 22, 2002

The problem with turning of the supercharger is that you need an alternate route for the air to get to the intake. The screw-type supercharger, such as used on the Mad Max vehicle, does not allow enough air into the engine to run when it is not turning. You would need a bypass route with valving to allow the setup. Probably more work that it's worth.

J.B.

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graunie

Discussion Starter · #11 · May 24, 2002

Weak tranny?!

Mad Max. Now that is a great movie. Most Mel fans never even saw this flick. The stunts were very real.

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cshepley

· #12 · May 26, 2002

Sounds a lot like a blow off valve could work too me. I think that is how the Lancia Delta S4 was set up for Group B rally.

jbhebert said:
The problem with turning of the supercharger is that you need an alternate route for the air to get to the intake. The screw-type supercharger, such as used on the Mad Max vehicle, does not allow enough air into the engine to run when it is not turning. You would need a bypass route with valving to allow the setup. Probably more work that it's worth.

J.B.

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