Power With Speed, Possible?
09-04-2003, 11:43 PM
#23
Senior Member
Join Date: Nov 2002
Location: Okinawa, Japan
Posts: 119
In my car, I set my secondary rev limiter to 5200rpm. I floor it, hold it, and the RPM comes up to 5200. At that point the ignition cuts off, not allowing it to rev past 5300. Then the RPM drops to about 5100 and the ignition comes back on.
During this process, the fuel never shuts off. During the time the ignition is not burning the fuel, it shoots the excess into the exhaust manifold, where the heat causes it to explode. The pressure and heat from the exploding fuel spins the turbine blade without any load on the engine.
This whole process adds up to turbo spooling before you even let the clutch out. I build up 15psi at the lights, and when I dump the clutch, it just climbs from there up to 23psi where I limit it at.
It causes more wheelspin due to having serious horsepower right from the get-go, but with proper adjustment of the rev limiter, I can bring it down to the point just before it bogs. This puts me at optimum launch RPM with power, no lag, and it comes off the line like a **********er.
The car gets through the first two gears faster, as it doesn't start boost from zero... so it not only helps at the line, it helps all the way down the strip.
During this process, the fuel never shuts off. During the time the ignition is not burning the fuel, it shoots the excess into the exhaust manifold, where the heat causes it to explode. The pressure and heat from the exploding fuel spins the turbine blade without any load on the engine.
This whole process adds up to turbo spooling before you even let the clutch out. I build up 15psi at the lights, and when I dump the clutch, it just climbs from there up to 23psi where I limit it at.
It causes more wheelspin due to having serious horsepower right from the get-go, but with proper adjustment of the rev limiter, I can bring it down to the point just before it bogs. This puts me at optimum launch RPM with power, no lag, and it comes off the line like a **********er.
The car gets through the first two gears faster, as it doesn't start boost from zero... so it not only helps at the line, it helps all the way down the strip.
09-05-2003, 01:41 AM
#25
Senior Member
Thread Starter
Join Date: Jul 2003
Location: in my pants
Posts: 227
During the time the ignition is not burning the fuel, it shoots the excess into the exhaust manifold, where the heat causes it to explode.
I am getting a feeling this isnt exactly good for your turbo to have fule exploding half way out the manafold half way in to the turbo.... or is it ok? seems lile an aful lot of stress on the turbo....
09-05-2003, 04:02 AM
#26
Senior Member
Join Date: Nov 2002
Location: Okinawa, Japan
Posts: 119
I have mine hooked to a switch near my shifter for launching. Some people put it on their clutch, that way whenever they push the clutch, they can hold the gas to the floor.
No, its not so good for the turbine wheel
No, its not so good for the turbine wheel
09-05-2003, 01:28 PM
#28
Senior Member
Join Date: Sep 2002
Posts: 2,550
It does put a lot of stress on the turbo and you need to have a really good manifold or it can crack it or break a weld due the the intense pressure created. BUT DAMN IF IT AIN'T COOL.. Fire out the exaust is always cool and it sound like small arms fire from a distance..
09-05-2003, 07:20 PM
#29
Senior Member
Thread Starter
Join Date: Jul 2003
Location: in my pants
Posts: 227
I am trying to figure out "how much" stress it will put on the turbo. Basicaly is it worth doing or will this destroy the turbo really fast. And thats a few grand to rebuild if destroyed = not worth it..... so.... opinions?
