Power With Speed, Possible?
09-04-2003, 11:59 AM
#13
Senior Member
Join Date: May 2002
Location: California
Posts: 22,465
Originally Posted by epion2985' date='Sep 3 2003, 06:58 PM
why?! if you need me to tell you why go watch home and garden tv or something.... lol
the lag of a big turbo really scares me... any words of encoragment? (see I cant spell either
)
PS:
does anyone know if there are any ceramic turbines out there?
the lag of a big turbo really scares me... any words of encoragment? (see I cant spell either
PS:
does anyone know if there are any ceramic turbines out there?
mike
09-04-2003, 01:27 PM
#15
Senior Member
Join Date: Sep 2002
Posts: 2,550
On water injection and spool up... the water vapor in the exaust will add a little extra push to the ex wheel, but you have to remember that the water injection doesn't come on till your already in boost. I didn't mention that in the water injection thread, so it's not going to do much.
You also have to remember that a ported engine with a big high flowing turbo even though it is lagging on building boost is still probably flowing more air in to the engine than a smaller more restrictive turbo that builds boost fast, so lag doesn't really mean ****. I.e., say one guys running a smaller more responsive turbo and hits full boost at 3800 rpm and another guy has a big single on that doesn't hit full boost till 5,000 rpm and they are both boosting 20 psi, odds are that the guy with the big turbo who is only at 12psi of boost when he is at that 3800 rpm still has more power than the guy who's already at 20 psi even though he's still got boost lag. Boost lag is also good for drag racing because the power comes on smooth and the car will keep traction and pull hard and evenly where a spiky fast spooling turbo will have a power band that jumps all at once and will spin the tires and then fall off power real fast as back pressure on the little ex housing builds up. Guess who's going to win that race.
boost lag doesn't mean **** and is actually a good thing on a street car or drag car that isn't running slicks and on a circuit car it isn't a problem if you can drive and know how to keep the car in the tork/power band.
You also have to remember that a ported engine with a big high flowing turbo even though it is lagging on building boost is still probably flowing more air in to the engine than a smaller more restrictive turbo that builds boost fast, so lag doesn't really mean ****. I.e., say one guys running a smaller more responsive turbo and hits full boost at 3800 rpm and another guy has a big single on that doesn't hit full boost till 5,000 rpm and they are both boosting 20 psi, odds are that the guy with the big turbo who is only at 12psi of boost when he is at that 3800 rpm still has more power than the guy who's already at 20 psi even though he's still got boost lag. Boost lag is also good for drag racing because the power comes on smooth and the car will keep traction and pull hard and evenly where a spiky fast spooling turbo will have a power band that jumps all at once and will spin the tires and then fall off power real fast as back pressure on the little ex housing builds up. Guess who's going to win that race.
boost lag doesn't mean **** and is actually a good thing on a street car or drag car that isn't running slicks and on a circuit car it isn't a problem if you can drive and know how to keep the car in the tork/power band.
09-04-2003, 04:21 PM
#17
Senior Member
Join Date: Nov 2002
Location: Okinawa, Japan
Posts: 119
A nice side-effect of a big single is that you don't use it all the time while you're driving down the road. You end up putting less wear & tear on your engine during typical daily driving situations... and you get BETTER gas mileage. As long as you stay out of the boost... because as soon as you start making power, gas mileage goes out the window.
I usually don't boost my car driving to work anymore... when I do, I have to be sure I've got a good distance in front of me, otherwise I'll be planted in someone's back bumper one of these days. However, when some unlucky challenger rolls up and revs on me, power is only a push of the gas pedal away.
I usually don't boost my car driving to work anymore... when I do, I have to be sure I've got a good distance in front of me, otherwise I'll be planted in someone's back bumper one of these days. However, when some unlucky challenger rolls up and revs on me, power is only a push of the gas pedal away.