has anyone thought of putting a supercharger/blower before the turbo?
I would think it would get rid of the lag.
reason I bring this up is I have a blower and a old turbo laying around.
the turbo I can convert into a supercharger(it's bigger than the garret. it's a holset h1c).
any thoughts?
Quote from: marcus18has anyone thought of putting a supercharger/blower before the turbo?
I would think it would get rid of the lag.
reason I bring this up is I have a blower and a old turbo laying around.
the turbo I can convert into a supercharger(it's bigger than the garret. it's a holset h1c).
any thoughts?
MYTH: The turbo on the TGP has too much lag.
TRUTH: The computer on the TGP has too much lag.
The turbo on the TGP is small enough that there isn't any real lag. Its actually the ECM that is controlling the boost ramp at all times. It makes it seem like there is lag.
That said, I think a supercharger turbo combo is a good means of two stage pressurization, but would be unneccesary on an engine of this displacment and powerlevel.
Supercharger efficiency (perhaps with the exception of centrifugal SC, which is basically a belt driven turbo) drastically drops off at higher RPMs where a turbo needs speed (a larger turbo anyways) to produce power. A direct drive supercharger of a positive displacment configuration would help eliminate the low end lag a large turbo would produce. I've seen this done but only in high horsepower configurations. I'm not sure what kind of results would be produced on a smaller motor.
chris is 100% right! If you want to find out for yourself just remove your vaccume hose on the bottom of turbo and punch it (being careful of course not to blow the motor) you will notice instantaneous spool up and no lag. Its definitely the ecu! Mine actually came off somehow and I was noticing instant spool up but of course i new right away something was wrong so when i got home i found the vaccume hose had come off so now I have a tiny hose clamp on it :lol:
why not keep it off.....??
Quote from: turbo90gpwhy not keep it off.....??
On a stock car you will very quickly hit the fuel cutoff. On a car with the boost cutoff removed. you can easily overboost the motor. For those of you who don't know, the boost is regulated by venting the exhaust gas before it hits the turbine wheel. There is a little flapper at the back of the turbo that allows the exhaust to escape into the downpipe without going through the turbine. Its connected to a shaft which is connected to the wastegate actuator. Boost pushes on the actuator, which opens the flapper. With the vac hose undone, the only thing regulating boost is exhaust gas pressure building so high it pushes the flapper open. You can easily overboost a motor this way, and the boost is not consistent. This is not a way to run a turbo.
Chris
with a stock intake its hard to tell, but i got a open air filter and if you drive about 10-20 mph with slight gas applied you will get really no spool at all. With the hose removed as soon as you touch the pedal you can here the hiiisssss and increased wine as you give more gas. Riding without the boost cut is just plain unreal and I do it from time to time but I never ever exeec 3K rpm with it off which is okay but then again its bad for me because I have no BOV so I am killing my turbo!