• The site migration is complete! Hopefully everything transferred properly from the multiple decades old software we were using before. If you notice any issues please let me know, thanks! Also, I'm still working on things like chatbox, etc so hopefully those will be working in the next week or two.

CAI Myths Busted

Does the bypass valve open at a certain psi like the wastegate does? And i dont ever plan on running anymore than 10lbs. No need. Unless im really careful about it. And i have hptuners so i can detect knock retard.
 


Heres a short and sweet version As the engine loses vacum the bypass valve closes causing more air to hit the rotors to be compressed hence..creating more boost
 
So no. Ok. Well i would like to be able to control my boost like on a turbo car. With either a manual or elecric boost controller. Is that not possible on these root types? I know you can on cintriphical superchargers.
 


2009antz2009 said:
So no. Ok. Well i would like to be able to control my boost like on a turbo car. With either a manual or elecric boost controller. Is that not possible on these root types? I know you can on cintriphical superchargers.
Click to expand...
they sell electronic ones at ZZP but a waste if you wana conrol boost buy belts and a MPS pulley system. i i was pushing maybe 11-12lbs at most on my GTP when i had it but its still controllable these things wont kill you until you get a gen 5 and 2.3 pulley and E85 lol
 




Because of stuff like this

2009antz2009 said:
Ok good. Thought i had a leak. But serious questions now. I have this idea. Im very familiar with turbos but not these roots type supercharger. Is there a wastegate on these? Or can it only peak at 7.1?
Click to expand...

Le dumbs.

I always thought the BC was kinda pointless anyways. It's a roots blower...you're still going to make most of all your boost level when you stab the gas no matter the RPM. Sounds like a solid way to make Zoomer $200~ richer.
 
but it limits max boost, that's the point. you can just run a dumb pulley and dial it in to whatever you want.
 
2009antz2009 said:
No matter what forums i've gone to one of the first mods they suggest is a CAI. Either in your fender or in a heat shielded box. Well i'm here to tell you, a CAI will NOT add horsepower. ok maybe that's a little of an overstatement.

The theory of a CAI adding horse power is usually based on two statements
A. if the motor can get air in faster it can get air our faster.
B. Colder air is denser air.

Now to discuss both these accusations.

A. Your motor in essence is a vacuum. sucks air in pushes air out. simple, but it really doesn't matter how much air you can suck in if it has no place to go. On most factory cars the exhaust is pretty restrictive due to emissions. so no matter how open your intake is you will only be able to push a certain amount of air through your motor with out also opening up your exhaust. think of it as putting your hand over the air release on some shop vacs. as they suck in they collect the dirt and push the air out. Now put your hand on the intake part of the vacuum and then cover the exhaust port of the vacuum you'll notice a huge loss of intake flow. no matter how big or open that intake hose is. the phrase (more air = more power) does come into play here. but how much more air do you think is coming in? if you have a boost vacuum gauge this will make more sence. let your car idle.. read the vacuum. say 23lbs of vacuum now take your intake hose 100% off and check again. itll most likely be 23lbs of vacuum. no matter how open your intake is it will always have that peak vacuum it can hit, now with forced induction (turbo, supercharger) the air is forced into the motor causing your vacuum pressure to increase. say at 3000 rpms your vacuum with out forced induction is 29lbs. now say you run 10lbs of boost. in reality your engine now has 39lbs of vacuum it can use to intake and push out causing more power.

B. Cold air is denser air. well this statement has truth to it. but in this context, how much good will denser air be if your not also getting the flow of fuel you need. the typical engine ecm can compensate up to a 7% change in air density and compensate by either adding or taking more fuel. thats why you get different gas milage at different altitudes.. if the density of the air you suck in through your intake is more of less than that 7% it is diong no good (without a pcm tune)

all in all, what i am saying is, CAI's may sound cool. but they really aren't worth your money adding until you can modify either the pcm or your exhaust system.

short little rant. (cant comment in the rant section yet)
Click to expand...

I'm not going to read through this whole thread. But, I have dyno proven gains of 8WHP on a completely stock 2001 GTP when removing the stock intake and putting a filter on the TB. Back to back dyno runs with about 10-15 minutes between runs. Both on 91 octane.
 
^^That.

Bio248 said:
but it limits max boost, that's the point. you can just run a dumb pulley and dial it in to whatever you want.
Click to expand...

Why not be smart and just run the right pulley so when it fails; like most electrical things do...it doesn't grenade your face?
 
You must log in or register to reply here.
Back
Top